Holds a sequence. More...

#include <Sequence.h>

Inheritance diagram for libdap::Sequence:

Public Types
typedef stack< BaseType * >	btp_stack

typedef std::vector< BaseType * >::const_iterator	Vars_citer

typedef std::vector< BaseType * >::iterator	Vars_iter

typedef std::vector< BaseType * >::reverse_iterator	Vars_riter

Public Member Functions
virtual void	add_var (BaseType *bt, Part part=nil)

virtual void	add_var_nocopy (BaseType *bt, Part part=nil)

virtual unsigned int	buf2val (void **)
	Reads the class data. More...

virtual bool	check_semantics (string &msg, bool all=false)
	Compare an object's current state with the semantics of its type. More...

virtual void	clear_local_data ()

virtual void	compute_checksum (Crc32 &checksum)
	include the data for this variable in the checksum DAP4 includes a checksum with every data response. This method adds the variable's data to that checksum. More...

virtual bool	d4_ops (BaseType *b, int op)
	Evaluator a relop for DAP4. More...

virtual string	dataset () const
	Returns the name of the dataset used to create this instance. More...

virtual void	del_var (const string &name)

virtual void	del_var (Vars_iter i)

virtual void	deserialize (D4StreamUnMarshaller &um, DMR &dmr)

virtual bool	deserialize (UnMarshaller &um, DDS *dds, bool reuse=false)
	Deserialize (read from the network) the entire Sequence. More...

virtual void	dump (ostream &strm) const
	dumps information about this object More...

virtual int	element_count (bool leaves=false)
	Count the members of constructor types. More...

virtual std::string	FQN () const

virtual AttrTable &	get_attr_table ()

virtual int	get_ending_row_number ()
	Get the ending row number. More...

virtual BaseType *	get_parent () const

int	get_row_number () const

virtual int	get_row_stride ()
	Get the row stride. More...

int	get_starting_row_number ()
	Get the starting row number. More...

bool	get_unsent_data () const
	Get the unsent data property. More...

BaseType *	get_var_index (int i)

Vars_iter	get_vars_iter (int i)

void	increment_row_number (unsigned int i)

virtual void	intern_data ()
	Read data into this variable. More...

virtual void	intern_data (ConstraintEvaluator &eval, DDS &dds)

virtual bool	is_constructor_type () const
	Returns true if the instance is a constructor (i.e., Structure, Sequence or Grid) type variable. More...

virtual bool	is_dap2_only_type ()

virtual bool	is_dap4 () const

virtual bool	is_in_selection ()
	Is this variable part of the current selection? More...

virtual bool	is_leaf_sequence ()

virtual bool	is_linear ()
	Check to see whether this variable can be printed simply. More...

virtual bool	is_simple_type () const
	Returns true if the instance is a numeric, string or URL type variable. More...

virtual bool	is_vector_type () const
	Returns true if the instance is a vector (i.e., array) type variable. More...

virtual int	length () const

virtual string	name () const
	Returns the name of the class instance. More...

virtual int	number_of_rows () const

Sequence &	operator= (const Sequence &rhs)

virtual bool	ops (BaseType *b, int op)
	Evaluate relational operators. More...

void	print_dap4 (XMLWriter &xml, bool constrained=false)

virtual void	print_decl (ostream &out, string space=" ", bool print_semi=true, bool constraint_info=false, bool constrained=false)
	Print an ASCII representation of the variable structure. More...

virtual void	print_decl (FILE *out, string space=" ", bool print_semi=true, bool constraint_info=false, bool constrained=false)
	Print an ASCII representation of the variable structure. More...

virtual void	print_one_row (ostream &out, int row, string space, bool print_row_num=false)

virtual void	print_one_row (FILE *out, int row, string space, bool print_row_num=false)

virtual void	print_val (ostream &out, string space="", bool print_decl_p=true)
	Prints the value of the variable. More...

virtual void	print_val (FILE *out, string space="", bool print_decl_p=true)
	Prints the value of the variable. More...

virtual void	print_val_by_rows (ostream &out, string space="", bool print_decl_p=true, bool print_row_numbers=true)

virtual void	print_val_by_rows (FILE *out, string space="", bool print_decl_p=true, bool print_row_numbers=true)

virtual void	print_xml (ostream &out, string space=" ", bool constrained=false)

virtual void	print_xml (FILE *out, string space=" ", bool constrained=false)

virtual void	print_xml_writer (XMLWriter &xml, bool constrained=false)

virtual BaseType *	ptr_duplicate ()

virtual bool	read ()
	simple implementation of read that iterates through vars and calls read on them More...

virtual bool	read_p ()
	Has this variable been read? More...

virtual bool	read_row (int row, DDS &dds, ConstraintEvaluator &eval, bool ce_eval=true)

void	reset_row_number ()
	Rest the row number counter. More...

void	reset_row_number (bool recur)
	A recursive version of reset_row_number() More...

virtual BaseTypeRow *	row_value (size_t row)
	Get a whole row from the sequence. More...

virtual bool	send_p ()
	Should this variable be sent? More...

	Sequence (const string &n)
	The Sequence constructor. More...

	Sequence (const string &n, const string &d)
	The Sequence server-side constructor. More...

	Sequence (const Sequence &rhs)
	The Sequence copy constructor. More...

virtual void	serialize (D4StreamMarshaller &m, DMR &dmr, bool filter=false)
	Serialize a Constructor. More...

virtual bool	serialize (ConstraintEvaluator &eval, DDS &dds, Marshaller &m, bool ce_eval=true)

virtual void	set_attr_table (const AttrTable &at)

virtual void	set_in_selection (bool state)
	Set the in_selection property. More...

virtual void	set_is_dap4 (const bool v)

virtual void	set_leaf_p (bool state)

virtual void	set_leaf_sequence (int lvl=1)
	Mark the Sequence which holds the leaf elements. More...

virtual void	set_length (int)
	Set the number of elements for this variable. More...

virtual void	set_name (const string &n)
	Sets the name of the class instance. More...

virtual void	set_parent (BaseType *parent)

virtual void	set_read_p (bool state)
	Sets the value of the read_p property. More...

virtual void	set_row_number_constraint (int start, int stop, int stride=1)

virtual void	set_send_p (bool state)

virtual void	set_synthesized_p (bool state)

virtual void	set_type (const Type &t)
	Sets the type of the class instance. More...

void	set_unsent_data (bool usd)
	Set the unsent data property. More...

virtual void	set_value (SequenceValues &values)

virtual bool	synthesized_p ()

virtual string	toString ()

virtual void	transfer_attributes (AttrTable *at)

virtual std::vector< BaseType * > *	transform_to_dap2 (AttrTable *parent_attr_table)
	DAP4 to DAP2 transform. More...

virtual void	transform_to_dap4 (D4Group root, Constructor container)

virtual Type	type () const
	Returns the type of the class instance. More...

virtual string	type_name () const
	Returns the type of the class instance as a string. More...

virtual unsigned int	val2buf (void *, bool)
	Loads class data. More...

virtual SequenceValues	value ()

virtual SequenceValues &	value_ref ()

virtual BaseType *	var (const string &name, bool exact_match=true, btp_stack *s=0)
	btp_stack no longer needed; use back pointers (BaseType::get_parent()) More...

virtual BaseType *	var (const string &n, btp_stack &s)

Vars_iter	var_begin ()

Vars_iter	var_end ()

Vars_riter	var_rbegin ()

Vars_riter	var_rend ()

virtual BaseType *	var_value (size_t row, const string &name)
	Get the BaseType pointer to the named variable of a given row. More...

virtual BaseType *	var_value (size_t row, size_t i)
	Get the BaseType pointer to the $i^{th}$ variable of row. More...

virtual unsigned int	width (bool constrained=false) const


virtual D4Attributes *	attributes ()

virtual void	set_attributes (D4Attributes *)

virtual void	set_attributes_nocopy (D4Attributes *)

Static Public Member Functions
static AttrTable *	make_dropped_vars_attr_table (vector< BaseType > dropped_vars)

Protected Types
typedef stack< SequenceValues * >	sequence_values_stack_t

Protected Member Functions
virtual void	intern_data_for_leaf (DDS &dds, ConstraintEvaluator &eval, sequence_values_stack_t &sequence_values_stack)

virtual void	intern_data_parent_part_one (DDS &dds, ConstraintEvaluator &eval, sequence_values_stack_t &sequence_values_stack)

virtual void	intern_data_parent_part_two (DDS &dds, ConstraintEvaluator &eval, sequence_values_stack_t &sequence_values_stack)

virtual void	intern_data_private (ConstraintEvaluator &eval, DDS &dds, sequence_values_stack_t &sequence_values_stack)

void	m_duplicate (const Constructor &s)

void	m_duplicate (const BaseType &bt)
	Perform a deep copy. More...

void	m_duplicate (const Sequence &s)

BaseType *	m_exact_match (const string &name, btp_stack *s=0)

BaseType *	m_leaf_match (const string &name, btp_stack *s=0)

virtual bool	serialize_leaf (DDS &dds, ConstraintEvaluator &eval, Marshaller &m, bool ce_eval)

virtual bool	serialize_parent_part_one (DDS &dds, ConstraintEvaluator &eval, Marshaller &m)

virtual void	serialize_parent_part_two (DDS &dds, ConstraintEvaluator &eval, Marshaller &m)

Protected Attributes
bool	d_in_selection

bool	d_is_synthesized

std::vector< BaseType * >	d_vars

Friends
class	SequenceTest

Detailed Description

Holds a sequence.

This is the interface for the class Sequence. A sequence contains a single set of variables, all at the same lexical level just like a Structure. Like a Structure, a Sequence may contain other compound types, including other Sequences. Unlike a Structure, a Sequence defines a pattern that is repeated N times for a sequence of N elements. It is useful to think of a Sequence as representing a table of values (like a relational database), with each row of the table corresponding to a Sequence instance.'' (This usage can be confusing, sinceinstance'' also refers to a particular item of class Sequence.) For example:

Sequence {
String name;
Int32 age;
} person;

This represents a Sequence of ``person'' records, each instance of which contains a name and an age:

Fred       34
Ralph      23
Andrea     29
...

A Sequence can be arbitrarily long, which is to say that its length is not part of its declaration. A Sequence can contain other Sequences:

Sequence {
String name;
Int32 age;
Sequence {
String friend;
} friend_list;
} person;

This is still represented as a single table, but each row contains the elements of both the main Sequence and the nested one:

Fred       34     Norman
Fred       34     Andrea
Fred       34     Ralph
Fred       34     Lisa
Ralph      23     Norman
Ralph      23     Andrea
Ralph      23     Lisa
Ralph      23     Marth
Ralph      23     Throckmorton
Ralph      23     Helga
Ralph      23     Millicent
Andrea     29     Ralph
Andrea     29     Natasha
Andrea     29     Norman
...        ..     ...

Internally, the Sequence is represented by a vector of vectors. The members of the outer vector are the members of the Sequence. This includes the nested Sequences, as in the above example.

NB: Note that in the past this class had a different behavior. It held only one row at a time and the deserialize(...) method had to be called from within a loop. This is no longer true. Now the deserailize(...) method should be called once and will read the entire sequence's values from the server. All the values are now stored in an instance of Sequence, not just a single row's.

Because the length of a Sequence is indeterminate, there are changes to the behavior of the functions to read this class of data. The read() function for Sequence must be written so that successive calls return values for successive rows of the Sequence.

Similar to a C structure, you refer to members of Sequence elements with a .'' notation. For example, if the Sequence has a member Sequence calledTom'' and Tom has a member Float32 called shoe_size'', you can refer to Tom's shoe size as Tom.shoe_size''.

Note: This class contains the 'logic' for both the server- and client-side behavior. The field d_values is used by the client-side methods to store the entire Sequence. On the server-side, the read() method uses an underlying data system to read one row of data values which are then serialized using the serialize() methods of each variable.

Todo:: Add an isEmpty() method which returns true if the Sequence is empty. This should work before and after calling deserialize().

Definition at line 162 of file Sequence.h.

Constructor & Destructor Documentation

◆ Sequence() [1/3]

libdap::Sequence::Sequence ( const string & n )

The Sequence constructor.

The Sequence constructor requires only the name of the variable to be created. The name may be omitted, which will create a nameless variable. This may be adequate for some applications.

Parameters

n	A string containing the name of the variable to be created.

Definition at line 161 of file Sequence.cc.

◆ Sequence() [2/3]

libdap::Sequence::Sequence	(	const string &	n,
		const string &	d
	)

The Sequence server-side constructor.

The Sequence server-side constructor requires the name of the variable to be created and the dataset name from which this variable is being created.

Parameters

n	A string containing the name of the variable to be created.
d	A string containing the name of the dataset from which this variable is being created.

Definition at line 177 of file Sequence.cc.

◆ Sequence() [3/3]

libdap::Sequence::Sequence ( const Sequence & rhs )

The Sequence copy constructor.

Definition at line 185 of file Sequence.cc.

Member Function Documentation

◆ add_var()

void libdap::Constructor::add_var	(	BaseType *	bt,
		Part	part = `nil`
	)

virtualinherited

Adds an element to a Constructor.

Parameters

bt	A pointer to the variable to add to this Constructor.
part	Not used by this class, defaults to nil

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid.

Definition at line 407 of file Constructor.cc.

◆ add_var_nocopy()

void libdap::Constructor::add_var_nocopy	(	BaseType *	bt,
		Part	part = `nil`
	)

virtualinherited

Adds an element to a Constructor.

Parameters

bt	A pointer to thee variable to add to this Constructor.
part	Not used by this class, defaults to nil

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid.

Definition at line 432 of file Constructor.cc.

◆ attributes()

D4Attributes * libdap::BaseType::attributes ( )

virtualinherited

DAP4 Attribute methods

Definition at line 599 of file BaseType.cc.

◆ buf2val()

virtual unsigned int libdap::Constructor::buf2val ( void ** val )

inlinevirtualinherited

Reads the class data.

Reads the class data into the memory referenced by val. The caller should either allocate enough storage to val to hold the class data or set *val to null. If *val is NULL, memory will be allocated by this function with new(). If the memory is allocated this way, the caller is responsible for deallocating that memory. Array and values for simple types are stored as C would store an array.

Deprecated:: Use value() in the leaf classes.

Parameters

val	A pointer to a pointer to the memory into which the class data will be copied. If the value pointed to is NULL, memory will be allocated to hold the data, and the pointer value modified accordingly. The calling program is responsible for deallocating the memory references by this pointer.

Returns: The size (in bytes) of the information copied to val.

Implements libdap::BaseType.

Definition at line 118 of file Constructor.h.

◆ check_semantics()

bool libdap::Constructor::check_semantics	(	string &	msg,
		bool	all = `false`
	)

virtualinherited

Compare an object's current state with the semantics of its type.

This function checks the class instance for internal consistency. This is important to check for complex constructor classes. For BaseType, an object is semantically correct if it has both a non-null name and type.

For example, an Int32 instance would return FALSE if it had no name or no type defined. A Grid instance might return FALSE for more complex reasons, such as having Map arrays of the wrong size or shape.

This function is used by the DDS class, and will rarely, if ever, be explicitly called by a DODS application program. A variable must pass this test before it is sent, but there may be many other stages in a retrieve operation where it would fail.

Returns: Returns FALSE when the current state violates some aspect of the type semantics, TRUE otherwise.

Parameters

msg	A returned string, containing a message indicating the source of any problem.
all	For complex constructor types (Grid, Sequence, Structure), this flag indicates whether to check the semantics of the member variables, too.

See also: DDS::check_semantics

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid.

Definition at line 792 of file Constructor.cc.

◆ clear_local_data()

void libdap::Sequence::clear_local_data ( )

virtual

Remove any read or set data in the private data of the variable, setting read_p() to false. Used to clear any dynamically allocated storage that holds (potentially large) data. For the simple types, this no-op version is all that's needed. Vector and some other classes define a special version and have serialize() implementations that call it to free data as soon as possible after sending it.

Note: Added 7/5/15 jhrg; Any specialization of this should make sure to reset the read_p property.

Reimplemented from libdap::BaseType.

Definition at line 247 of file Sequence.cc.

◆ compute_checksum()

void libdap::Constructor::compute_checksum ( Crc32 & checksum )

virtualinherited

include the data for this variable in the checksum DAP4 includes a checksum with every data response. This method adds the variable's data to that checksum.

Parameters

checksum A Crc32 instance that holds the current checksum.

Implements libdap::BaseType.

Definition at line 550 of file Constructor.cc.

◆ d4_ops()

bool libdap::BaseType::d4_ops	(	BaseType *	b,
		int	op
	)

virtualinherited

Evaluator a relop for DAP4.

This method is used by the filter expression evaluation code in DAP4. Each of the 'data type' classes that support relops must overload this method. In an expression of the form arg1 op arg2, this object is arg1, the parameter 'b' is arg2 and op is the relational operator.

Note: I used the same relop codes for DAP4 as in the DAP2 parser/scanner which makes for some coupling between them, but cuts way down on the duplication of the evaluator logic, which is somewhat involved.

Parameters

b	The second argument in the relational expression
op	The infix relational operator

Returns: True if the expression is true, False otherwise.

Reimplemented in libdap::Str, libdap::Int32, libdap::Float32, libdap::Byte, libdap::Float64, libdap::Int16, libdap::Int64, libdap::UInt64, and libdap::Int8.

Definition at line 1282 of file BaseType.cc.

◆ dataset()

string libdap::BaseType::dataset ( ) const

virtualinherited

Returns the name of the dataset used to create this instance.

A dataset from which the data is to be read. The meaning of this string will vary among different types of data sources. It may be the name of a data file or an identifier used to read data from a relational database.

Definition at line 358 of file BaseType.cc.

◆ del_var()

void libdap::Constructor::del_var ( const string & n )

virtualinherited

Remove an element from a Constructor.

Parameters

n	name of the variable to remove

Definition at line 448 of file Constructor.cc.

◆ deserialize() [1/2]

void libdap::Constructor::deserialize	(	D4StreamUnMarshaller &	um,
		DMR &	dmr
	)

virtualinherited

The DAP4 deserialization method.

Parameters

um
dmr

Exceptions

Error or InternalErr

Reimplemented from libdap::BaseType.

Reimplemented in libdap::D4Sequence, and libdap::D4Group.

Definition at line 609 of file Constructor.cc.

◆ deserialize() [2/2]

bool libdap::Sequence::deserialize	(	UnMarshaller &	um,
		DDS *	dds,
		bool	reuse = `false`
	)

virtual

Deserialize (read from the network) the entire Sequence.

This method used to read a single row at a time. Now the entire sequence is read at once. The method used to return True to indicate that more data needed to be deserialized and False when the sequence was completely read. Now it simply returns false. This might seem odd, but making this method return false breaks existing software the least.

Parameters

um	An UnMarshaller that knows how to deserialize data
dds	A DataDDS from which to read.
reuse	Passed to child objects when they are deserialized. Some implementations of deserialize() use this to determine if new storage should be allocated or existing storage reused.

Exceptions

Error	if a sequence stream marker cannot be read.
InternalErr	if the `dds` param is not a DataDDS.

Returns: A return value of false indicates that an EOS ("end of Sequence") marker was found, while a value of true indicates that there are more rows to be read. This version always reads the entire sequence, so it always returns false.

Reimplemented from libdap::Constructor.

Definition at line 1003 of file Sequence.cc.

◆ dump()

void libdap::Sequence::dump ( ostream & strm ) const

virtual

dumps information about this object

Displays the pointer value of this instance and information about this instance.

Parameters

strm	C++ i/o stream to dump the information to

Returns: void

Reimplemented from libdap::Constructor.

Definition at line 1278 of file Sequence.cc.

◆ element_count()

int libdap::Constructor::element_count ( bool leaves = false )

virtualinherited

Count the members of constructor types.

Return a count of the total number of variables in this variable. This is used to count the number of variables held by a constructor variable - for simple type and vector variables it always returns 1.

For compound data types, there are two ways to count members. You can count the members, or you can count the simple members and add that to the count of the compound members. For example, if a Structure contains an Int32 and another Structure that itself contains two Int32 members, the element count of the top-level structure could be two (one Int32 and one Structure) or three (one Int32 by itself and two Int32's in the subsidiary Structure). Use the leaves parameter to control which kind of counting you desire.

Returns: Returns 1 for simple types. For compound members, the count depends on the leaves argument.

Parameters

leaves This parameter is only relevant if the object contains other compound data types. If FALSE, the function counts only the data variables mentioned in the object's declaration. If TRUE, it counts the simple members, and adds that to the sum of the counts for the compound members. This parameter has no effect for simple type variables.

Reimplemented from libdap::BaseType.

Definition at line 194 of file Constructor.cc.

◆ FQN()

string libdap::Constructor::FQN ( ) const

virtualinherited

Return the FQN for this variable. This will include the D4 Group component of the name.

Returns: The FQN in a string

Reimplemented from libdap::BaseType.

Reimplemented in libdap::D4Group.

Definition at line 181 of file Constructor.cc.

◆ get_attr_table()

AttrTable & libdap::BaseType::get_attr_table ( )

virtualinherited

Get this variable's AttrTable. It's generally a bad idea to return a reference to a contained object, but in this case it seems that building an interface inside BaseType is overkill.

Use the AttrTable methods to manipulate the table.

Definition at line 582 of file BaseType.cc.

◆ get_ending_row_number()

int libdap::Sequence::get_ending_row_number ( )

virtual

Get the ending row number.

Return the ending row number if the sequence was constrained using row numbers (instead of, or in addition to, a relational constraint). If a relational constraint was also given, the row number corresponds to the row number of the sequence after applying the relational constraint.

If the bracket notation was not used to constrain this sequence, this method returns -1.

Returns: The ending row number.

Definition at line 1093 of file Sequence.cc.

◆ get_parent()

BaseType * libdap::BaseType::get_parent ( ) const

virtualinherited

Return a pointer to the Constructor or Vector which holds (contains) this variable. If this variable is at the top level, this method returns null.

Returns: A BaseType pointer to the variable's parent.

Definition at line 751 of file BaseType.cc.

◆ get_row_stride()

int libdap::Sequence::get_row_stride ( )

virtual

Get the row stride.

Return the row stride number if the sequence was constrained using row numbers (instead of, or in addition to, a relational constraint). If a relational constraint was also given, the row stride is applied to the sequence after applying the relational constraint.

If the bracket notation was not used to constrain this sequence, this method returns -1.

Returns: The row stride.

Definition at line 1077 of file Sequence.cc.

◆ get_starting_row_number()

int libdap::Sequence::get_starting_row_number ( )

Get the starting row number.

Return the starting row number if the sequence was constrained using row numbers (instead of, or in addition to, a relational constraint). If a relational constraint was also given, the row number corresponds to the row number of the sequence after applying the relational constraint.

If the bracket notation was not used to constrain this sequence, this method returns -1.

Returns: The starting row number.

Definition at line 1062 of file Sequence.cc.

◆ get_unsent_data()

bool libdap::Sequence::get_unsent_data ( ) const

inline

Get the unsent data property.

Definition at line 271 of file Sequence.h.

◆ get_var_index()

BaseType * libdap::Constructor::get_var_index ( int i )

inherited

Return the BaseType pointer for the ith variable.

Parameters

i	This index

Returns: The corresponding BaseType*.

Definition at line 397 of file Constructor.cc.

◆ get_vars_iter()

Constructor::Vars_iter libdap::Constructor::get_vars_iter ( int i )

inherited

Return the iterator for the ith variable.

Parameters

i the index

Returns: The corresponding Vars_iter

Definition at line 388 of file Constructor.cc.

◆ intern_data() [1/2]

void libdap::Constructor::intern_data ( )

virtualinherited

Read data into this variable.

Parameters

eval	Evaluator for a constraint expression
dmr	DMR for the whole dataset

Reimplemented from libdap::BaseType.

Reimplemented in libdap::D4Sequence, and libdap::D4Group.

Definition at line 556 of file Constructor.cc.

◆ intern_data() [2/2]

void libdap::Sequence::intern_data	(	ConstraintEvaluator &	eval,
		DDS &	dds
	)

virtual

This method is used to evaluate a constraint and based on those results load the Sequence variable with data. This simulates having a server call the serialize() method and a client call the deserialize() method without the overhead of any IPC. Use this method on the server-side to 'load the d_values field with data' so that other code and work with those data.

The somewhat odd algorithm used by serialize() is largely copied here, so comments about logic in serialize() and the related methods apply here as well.

Note: Even though each Sequence variable has a values field, only the top-most Sequence in a hierarchy of Sequences holds values. The field accessed by the var_value() method is a completely linked object; access the values of nested Sequences using the BaseType objects returned by var_value().; Only call this method for top-most Sequences. Never call it for Sequences which have a parent (directly or indirectly) variable that is a Sequence.

Parameters

eval	Use this constraint evaluator
dds	This DDS holds the variables for the data source

Reimplemented from libdap::Constructor.

Definition at line 797 of file Sequence.cc.

◆ is_constructor_type()

bool libdap::BaseType::is_constructor_type ( ) const

virtualinherited

Returns true if the instance is a constructor (i.e., Structure, Sequence or Grid) type variable.

Returns: True if the instance is a Structure, Sequence or Grid, False otherwise.

Definition at line 412 of file BaseType.cc.

◆ is_dap2_only_type()

bool libdap::Sequence::is_dap2_only_type ( )

virtual

The Sequence class will be streamlined for DAP4.

Definition at line 272 of file Sequence.cc.

◆ is_in_selection()

bool libdap::BaseType::is_in_selection ( )

virtualinherited

Is this variable part of the current selection?

Does this variable appear in either the selection part or as a function argument in the current constrain expression. If this property is set (true) then implementations of the read() method should read this variable.

Note: This method does not check, nor does it know about the semantics of, string arguments passed to functions. Those functions might include variable names in strings; they are responsible for reading those variables. See the grid (func_grid_select()) for an example.

See also: BaseType::read()

Definition at line 703 of file BaseType.cc.

◆ is_linear()

bool libdap::Sequence::is_linear ( )

virtual

Check to see whether this variable can be printed simply.

True if the instance can be flattened and printed as a single table of values. For Arrays and Grids this is always false. For Structures and Sequences the conditions are more complex. The implementation provided by this class always returns false. Other classes should override this implementation.

Todo:: Change the name to is_flattenable or something like that. 05/16/03 jhrg

Returns: True if the instance can be printed as a single table of values, false otherwise.

Reimplemented from libdap::Constructor.

Definition at line 292 of file Sequence.cc.

◆ is_simple_type()

bool libdap::BaseType::is_simple_type ( ) const

virtualinherited

Returns true if the instance is a numeric, string or URL type variable.

Returns: True if the instance is a scalar numeric, String or URL variable, False otherwise. Arrays (even of simple types) return False.

See also: is_vector_type()

Definition at line 393 of file BaseType.cc.

◆ is_vector_type()

bool libdap::BaseType::is_vector_type ( ) const

virtualinherited

Returns true if the instance is a vector (i.e., array) type variable.

Returns: True if the instance is an Array, False otherwise.

Definition at line 402 of file BaseType.cc.

◆ length()

int libdap::Sequence::length ( ) const

virtual

Returns the number of elements in a Sequence object. Note that this is not the number of items in a row, but the number of rows in the complete sequence object. To be meaningful, this must be computed after constraint expression (CE) evaluation. The purpose of this function is to facilitate translations between Sequence objects and Array objects, particularly when the Sequence is too large to be transferred from the server to the client in its entirety.

This function, to be useful, must be specialized for the API and data format in use.

Returns: The base implementation returns -1, indicating that the length is not known. Sub-classes specific to a particular API will have a more complete implementation.

Reimplemented from libdap::BaseType.

Definition at line 413 of file Sequence.cc.

◆ m_duplicate()

void libdap::BaseType::m_duplicate ( const BaseType & bt )

protectedinherited

Perform a deep copy.

Perform a deep copy. Copies the values of bt into *this. Pointers are dereferenced and their values are copied into a newly allocated instance.

Parameters

bt	The source object.

Definition at line 86 of file BaseType.cc.

◆ name()

string libdap::BaseType::name ( ) const

virtualinherited

Returns the name of the class instance.

Definition at line 320 of file BaseType.cc.

◆ ops()

bool libdap::BaseType::ops	(	BaseType *	b,
		int	op
	)

virtualinherited

Evaluate relational operators.

This method contains the relational operators used by the constraint expression evaluator in the DDS class. Each class that wants to be able to evaluate relational expressions must overload this function. The implementation in BaseType throws an InternalErr exception. The DAP library classes Byte, ..., Url provide specializations of this method. It is not meaningful for classes such as Array because relational expressions using Array are not supported.

The op argument refers to a table generated by bison from the constraint expression parser. Use statements like the following to correctly interpret its value:

switch (op) {
    case EQUAL: return i1 == i2;
    case NOT_EQUAL: return i1 != i2;
    case GREATER: return i1 > i2;
    case GREATER_EQL: return i1 >= i2;
    case LESS: return i1 < i2;
    case LESS_EQL: return i1 <= i2;
    case REGEXP: throw Error("Regular expressions are not supported for integer values");
    default: throw Error("Unknown operator");
}

This function is used by the constraint expression evaluator.

Parameters

b	Compare the value of this instance with b.
op	An integer index indicating which relational operator is implied. Choose one from the following: `EQUAL`, `NOT_EQUAL`, `GREATER`, `GREATER_EQL`, `LESS`, `LESS_EQL`, and `REGEXP`.

Returns: The boolean value of the comparison.

See also: BaseType::d4_ops(BaseType *, int)

Reimplemented in libdap::D4Enum, libdap::Str, libdap::Int32, libdap::Float32, libdap::Byte, libdap::Float64, libdap::UInt32, libdap::D4Opaque, libdap::Int16, libdap::UInt16, libdap::Int64, libdap::UInt64, and libdap::Int8.

Definition at line 1256 of file BaseType.cc.

◆ print_dap4()

void libdap::Constructor::print_dap4	(	XMLWriter &	xml,
		bool	constrained = `false`
	)

virtualinherited

Write the DAP4 XML representation for this variable. This method is used to build the DAP4 DMR response object.

Parameters

xml	An XMLWriter that will do the serialization
constrained	True if the response should show the variables subject to the current constraint expression.

Reimplemented from libdap::BaseType.

Reimplemented in libdap::D4Group.

Definition at line 768 of file Constructor.cc.

◆ print_decl() [1/2]

void libdap::Constructor::print_decl	(	ostream &	out,
		string	space = `" "`,
		bool	print_semi = `true`,
		bool	constraint_info = `false`,
		bool	constrained = `false`
	)

virtualinherited

Print an ASCII representation of the variable structure.

Write the variable's declaration in a C-style syntax. This function is used to create textual representation of the Data Descriptor Structure (DDS). See The DODS User Manual for information about this structure.

A simple array declaration might look like this:

Float64 lat[lat = 180];

While a more complex declaration (for a Grid, in this case), would look like this:

Grid {
ARRAY:
Int32 sst[time = 404][lat = 180][lon = 360];
MAPS:
Float64 time[time = 404];
Float64 lat[lat = 180];
Float64 lon[lon = 360];
} sst;

Parameters

out	The output stream on which to print the declaration.
space	Each line of the declaration will begin with the characters in this string. Usually used for leading spaces.
print_semi	A boolean value indicating whether to print a semicolon at the end of the declaration.
constraint_info	A boolean value indicating whether constraint information is to be printed with the declaration. If the value of this parameter is TRUE, `print_decl()` prints the value of the variable's `send_p()` flag after the declaration.
constrained	If this boolean value is TRUE, the variable's declaration is only printed if is the `send_p()` flag is TRUE. If a constraint expression is in place, and this variable is not requested, the `send_p()` flag is FALSE.

See also: DDS; DDS::CE

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid.

Definition at line 626 of file Constructor.cc.

◆ print_decl() [2/2]

void libdap::Constructor::print_decl	(	FILE *	out,
		string	space = `" "`,
		bool	print_semi = `true`,
		bool	constraint_info = `false`,
		bool	constrained = `false`
	)

virtualinherited

Print an ASCII representation of the variable structure.

Write the variable's declaration in a C-style syntax. This function is used to create textual representation of the Data Descriptor Structure (DDS). See The DODS User Manual for information about this structure.

A simple array declaration might look like this:

Float64 lat[lat = 180];

While a more complex declaration (for a Grid, in this case), would look like this:

Grid {
ARRAY:
Int32 sst[time = 404][lat = 180][lon = 360];
MAPS:
Float64 time[time = 404];
Float64 lat[lat = 180];
Float64 lon[lon = 360];
} sst;

Parameters

out	The output stream on which to print the declaration.
space	Each line of the declaration will begin with the characters in this string. Usually used for leading spaces.
print_semi	A boolean value indicating whether to print a semicolon at the end of the declaration.
constraint_info	A boolean value indicating whether constraint information is to be printed with the declaration. If the value of this parameter is TRUE, `print_decl()` prints the value of the variable's `send_p()` flag after the declaration.
constrained	If this boolean value is TRUE, the variable's declaration is only printed if is the `send_p()` flag is TRUE. If a constraint expression is in place, and this variable is not requested, the `send_p()` flag is FALSE.

See also: DDS; DDS::CE

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid.

Definition at line 617 of file Constructor.cc.

◆ print_val() [1/2]

void libdap::Sequence::print_val	(	ostream &	out,
		string	space = `""`,
		bool	print_decl_p = `true`
	)

virtual

Prints the value of the variable.

Prints the value of the variable, with its declaration. This function is primarily intended for debugging DODS applications. However, it can be overloaded and used to do some useful things. Take a look at the asciival and writeval clients, both of which overload this to output the values of variables in different ways.

Parameters

out	The output ostream on which to print the value.
space	This value is passed to the print_decl() function, and controls the leading spaces of the output.
print_decl_p	A boolean value controlling whether the variable declaration is printed as well as the value.

Reimplemented from libdap::Constructor.

Definition at line 1197 of file Sequence.cc.

◆ print_val() [2/2]

void libdap::Sequence::print_val	(	FILE *	out,
		string	space = `""`,
		bool	print_decl_p = `true`
	)

virtual

Prints the value of the variable.

Prints the value of the variable, with its declaration. This function is primarily intended for debugging DODS applications. However, it can be overloaded and used to do some useful things. Take a look at the asciival and writeval clients, both of which overload this to output the values of variables in different ways.

Parameters

out	The output stream on which to print the value.
space	This value is passed to the print_decl() function, and controls the leading spaces of the output.
print_decl_p	A boolean value controlling whether the variable declaration is printed as well as the value.

Reimplemented from libdap::Constructor.

Definition at line 1192 of file Sequence.cc.

◆ print_xml() [1/2]

void libdap::Constructor::print_xml	(	ostream &	out,
		string	space = `" "`,
		bool	constrained = `false`
	)

virtualinherited

Deprecated:

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid.

Definition at line 695 of file Constructor.cc.

◆ print_xml() [2/2]

void libdap::Constructor::print_xml	(	FILE *	out,
		string	space = `" "`,
		bool	constrained = `false`
	)

virtualinherited

Deprecated:

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid.

Definition at line 684 of file Constructor.cc.

◆ print_xml_writer()

void libdap::Constructor::print_xml_writer	(	XMLWriter &	xml,
		bool	constrained = `false`
	)

virtualinherited

Write the XML representation of this variable. This method is used to build the DDX XML response.

Parameters

out	Destination output stream
space	Use this to indent child declarations. Default is "".
constrained	If true, only print this if it's part part of the current projection. Default is False.

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid.

Definition at line 718 of file Constructor.cc.

◆ ptr_duplicate()

BaseType * libdap::Sequence::ptr_duplicate ( )

virtual

Clone this instance. Allocate a new instance and copy *this into it. This method must perform a deep copy.

@note This method should \e not copy data values, but must copy all
other fields in the object.

Returns: A newly allocated copy of this.

Implements libdap::BaseType.

Definition at line 192 of file Sequence.cc.

◆ read()

bool libdap::Constructor::read ( )

virtualinherited

simple implementation of read that iterates through vars and calls read on them

Returns: returns false to signify all has been read

Reimplemented from libdap::BaseType.

Definition at line 476 of file Constructor.cc.

◆ read_p()

bool libdap::BaseType::read_p ( )

virtualinherited

Has this variable been read?

Returns true if the value(s) for this variable have been read from the data source, otherwise returns false. This method is used to determine when values need to be read using the read() method. When read_p() returns true, this library assumes that buf2val() (and other methods such as get_vec()) can be used to access the value(s) of a variable.

Returns: True if the variable's value(s) have been read, false otherwise.

Definition at line 480 of file BaseType.cc.

◆ read_row()

bool libdap::Sequence::read_row	(	int	row,
		DDS &	dds,
		ConstraintEvaluator &	eval,
		bool	ce_eval = `true`
	)

virtual

Read row number row of the Sequence. The values of the row are obtained by calling the read() method of the sequence. The current row just read is stored in the Sequence instance along with its row number. If a selection expression has been supplied, rows are counted only if they satisfy that expression.

Note that we can only advance in a Sequence. It is not possible to back up and read a row numbered lower than the current row. If you need that you will need to replace the serialize() method with one of your own.

Used on the server side.

Note: The first row is row number zero. A Sequence with 100 rows will have row numbers 0 to 99.

Todo:: This code ignores the main reason for nesting the sequences, that if the outer Sequence's current instance fails the CE, there's no need to look at the values of the inner Sequence. But in the code that calls this method (serialize() and intern_data()) the CE is not evaluated until the inner-most Sequence (i.e., the leaf Sequence) is read. That means that each instance of the inner Sequence is read and the CE evaluated for each of those reads. To fix this, and the overall problem of complexity here, we need to re-think Sequences and how they behave. 11/13/2007 jhrg

Returns: A boolean value, with TRUE indicating that read_row should be called again because there's more data to be read. FALSE indicates the end of the Sequence.

Parameters

row	The row number to read.
dds	A reference to the DDS for this dataset.
eval	Use this as the constraint expression evaluator.
ce_eval	If True, evaluate any CE, otherwise do not.

Definition at line 499 of file Sequence.cc.

◆ reset_row_number() [1/2]

void libdap::Sequence::reset_row_number ( )

Rest the row number counter.

When reading a nested sequence, use this method to reset the internal row number counter. This is necessary so that the second, ... instances of the inner/nested sequence will start off reading row zero.

Definition at line 427 of file Sequence.cc.

◆ reset_row_number() [2/2]

void libdap::Sequence::reset_row_number ( bool recur )

A recursive version of reset_row_number()

Parameters

recur If true, reset the row number of child sequences as well

Definition at line 437 of file Sequence.cc.

◆ row_value()

BaseTypeRow * libdap::Sequence::row_value ( size_t row )

virtual

Get a whole row from the sequence.

Parameters

row	Get row number row from the sequence.

Returns: A BaseTypeRow object (vector<BaseType *>). Null if there's no such row number as row.

Definition at line 325 of file Sequence.cc.

◆ send_p()

bool libdap::BaseType::send_p ( )

virtualinherited

Should this variable be sent?

Returns the state of the send_p property. If true, this variable should be sent to the client, if false, it should not. If no constraint expression (CE) has been evaluated, this property is true for all variables in a data source (i.e., for all the variables listed in a DDS). If a CE has been evaluated, this property is true only for those variables listed in the projection part of the CE.

Returns: True if the variable should be sent to the client, false otherwise.

Definition at line 554 of file BaseType.cc.

◆ serialize() [1/2]

void libdap::Constructor::serialize	(	D4StreamMarshaller &	m,
		DMR &	dmr,
		bool	filter = `false`
	)

virtualinherited

Serialize a Constructor.

Todo:: See notebook for 8/21/14

Parameters

m
dmr	Unused
eval	Unused
filter	Unused

Exceptions

Error is thrown if the value needs to be read and that operation fails.

Reimplemented from libdap::BaseType.

Reimplemented in libdap::D4Sequence, and libdap::D4Group.

Definition at line 578 of file Constructor.cc.

◆ serialize() [2/2]

bool libdap::Sequence::serialize	(	ConstraintEvaluator &	eval,
		DDS &	dds,
		Marshaller &	m,
		bool	ce_eval = `true`
	)

virtual

Serialize a Sequence.

Leaf Sequences must be marked as such (see DDS::tag_nested_sequence()), as must the top most Sequence.

How the code works. Methods called for various functions are named in brackets:

Sending a one-level sequence:
```
Dataset {
    Sequence {
        Int x;
        Int y;
    } flat;
} case_1;
```
Serialize case_1 by reading successive rows and sending all of those that satisfy the CE. Before each row, send a start of instance (SOI) marker. Once all rows have been sent, send an End of Sequence (EOS) marker.[serialize_leaf].
Sending a nested sequence:
```
Dataset {
    Sequence {
        Int t;
        Sequence {
            Int z;
        } inner;
    } outer;
} case_2;
```
Serialize case_2 by reading the first row of outer and storing the values. Do not evaluate the CE [serialize_parent_part_one]. Call serialize() for inner and read each row for it, evaluating the CE for each row that is read. After the first row of inner is read and satisfies the CE, write out the SOI marker and values for outer [serialize_parent_part_two], then write the SOI and values for the first row of inner. Continue to read and send rows of inner until the last row has been read. Send EOS for inner [serialize_leaf]. Now read the next row of outer and repeat. Once outer is completely read, send its EOS marker.

Notes:

For a nested Sequence, the child sequence must follow all other types in the parent sequence (like the example). There may be only one nested Sequence per level.
CE evaluation happens only in a leaf sequence.
When no data satisfies a CE, the empty Sequence is signaled by a single EOS marker, regardless of the level of nesting of Sequences. That is, the EOS marker is sent for only the outer Sequence in the case of a completely empty response.

Reimplemented from libdap::Constructor.

Definition at line 607 of file Sequence.cc.

◆ set_attr_table()

void libdap::BaseType::set_attr_table ( const AttrTable & at )

virtualinherited

Set this variable's attribute table.

Parameters

at	Source of the attributes.

Definition at line 590 of file BaseType.cc.

◆ set_in_selection()

void libdap::Constructor::set_in_selection ( bool state )

virtualinherited

Set the in_selection property.

Set the in_selection property for this variable and all of its children.

Parameters

state Set the property value to state.

Reimplemented from libdap::BaseType.

Definition at line 834 of file Constructor.cc.

◆ set_leaf_sequence()

void libdap::Sequence::set_leaf_sequence ( int lvl = 1 )

virtual

Mark the Sequence which holds the leaf elements.

In a nested Sequence, the Sequence which holds the leaf elements is special because it during the serialization of this Sequence's data that constraint Expressions must be evaluated. If CEs are evaluated at the upper levels, then valid data may not be sent because it was effectively hidden from the serialization and evaluation code (see the documentation for the serialize_leaf() method).

The notion of the leaf Sequence needs to be modified to mean the lowest level of a Sequence where data are to be sent. Suppose there's a two level Sequence, but that only fields from the top level are to be sent. Then that top level is also the leaf Sequence and should be marked as such. If the lower level is marked as a leaf Sequence, then no values will ever be sent since the send_p property will always be false for each field and it's the call to serialize_leaf() that actually triggers transmission of values (because it's not until the code makes it into serialize_leaf() that it knows there are values to be sent.

Note: This method must not be called before the CE is parsed.

Parameters

lvl	The current level of the Sequence. a lvl of 1 indicates the topmost Sequence. The default value is 1.

See also: Sequence::serialize_leaf()

Definition at line 1236 of file Sequence.cc.

◆ set_length()

virtual void libdap::BaseType::set_length ( int )

inlinevirtualinherited

Set the number of elements for this variable.

Todo:: change param type to int64_t

Parameters

l	The number of elements

Reimplemented in libdap::D4Sequence, and libdap::Vector.

Definition at line 214 of file BaseType.h.

◆ set_name()

void libdap::BaseType::set_name ( const string & n )

virtualinherited

Sets the name of the class instance.

Reimplemented in libdap::Vector.

Definition at line 344 of file BaseType.cc.

◆ set_parent()

void libdap::BaseType::set_parent ( BaseType * parent )

virtualinherited

Set the parent property for this variable.

Note: Added ability to set parent to null. 10/19/12 jhrg

Parameters

parent Pointer to the Constructor of Vector parent variable or null if the variable has no parent (if it is at the top-level of a DAP2/3 DDS).

Exceptions

InternalErr thrown if called with anything other than a Constructor, Vector or Null.

Definition at line 733 of file BaseType.cc.

◆ set_read_p()

void libdap::Constructor::set_read_p ( bool state )

virtualinherited

Sets the value of the read_p property.

Sets the value of the read_p property. This indicates that the value(s) of this variable has/have been read. An implementation of the read() method should use this to set the read_p property to true.

Note: If the is_synthesized property is true, this method will not alter the is_read property. If you need that behavior, specialize the method in your subclasses if the various types.; For most of the types the default implementation of this method is fine. However, if you're building a server which must handle data represented using nested sequences, then you may need to provide a specialization of Sequence::set_read_p(). By default Sequence::set_read_p() recursively sets the read_p property for all child variables to state. For servers where one Sequence reads an outer set of values and another reads an inner set, this is cumbersome. In such a case, it is easier to specialize Sequence::set_read_p() so that it does not recursively set the read_p property for the inner Sequence. Be sure to see the documentation for the read() method!

Todo:: Look at making synthesized variables easier to implement and at making them more integrated into the overall CE evaluation process. Maybe the code that computes the synthesized var's value should be in the that variable's read() method? This might provide a way to get rid of the awkward 'projection functions' by replacing them with real children of BaseType. It would also provide a way to clean up the way the synthesized_p prop intrudes on the read_p prop.

See also: BaseType::read()

Parameters

state Set the read_p property to this state.

Reimplemented from libdap::BaseType.

Reimplemented in libdap::D4Group.

Definition at line 218 of file Constructor.cc.

◆ set_row_number_constraint()

void libdap::Sequence::set_row_number_constraint	(	int	start,
		int	stop,
		int	stride = `1`
	)

virtual

Set the start, stop and stride for a row-number type constraint. This should be used only when the sequence is constrained using the bracket notation (which supplies start, stride and stop information). If omitted, the stride defaults to 1.

Parameters

start	The starting row number. The first row is row zero.
stop	The ending row number. The 20th row is row 19.
stride	The stride. A stride of two skips every other row.

Definition at line 1106 of file Sequence.cc.

◆ set_send_p()

void libdap::Constructor::set_send_p ( bool state )

virtualinherited

Sets the value of the send_p flag. This function is meant to be called from within the constraint evaluator of other code which determines that this variable should be returned to the client. Data are ready to be sent when both the d_is_send and d_is_read flags are set to TRUE.

Parameters

state The logical state to set the send_p flag.

Reimplemented from libdap::BaseType.

Reimplemented in libdap::D4Group.

Definition at line 208 of file Constructor.cc.

◆ set_synthesized_p()

void libdap::BaseType::set_synthesized_p ( bool state )

virtualinherited

Set the synthesized flag. Before setting this flag be sure to set the read_p() state. Once this flag is set you cannot alter the state of the read_p flag!

See also: synthesized_p()

Definition at line 463 of file BaseType.cc.

◆ set_type()

void libdap::BaseType::set_type ( const Type & t )

virtualinherited

Sets the type of the class instance.

Definition at line 372 of file BaseType.cc.

◆ set_unsent_data()

void libdap::Sequence::set_unsent_data ( bool usd )

inline

Set the unsent data property.

Definition at line 277 of file Sequence.h.

◆ set_value()

void libdap::Sequence::set_value ( SequenceValues & values )

virtual

Set value of this Sequence. This does not perform a deep copy, so data should be allocated on the heap and freed only when the Sequence dtor is called.

See also: SequenceValues; BaseTypeRow

Parameters

values Set the value of this Sequence.

Definition at line 337 of file Sequence.cc.

◆ synthesized_p()

bool libdap::BaseType::synthesized_p ( )

virtualinherited

Returns true if the variable is a synthesized variable. A synthesized variable is one that is added to the dataset by the server (usually with a `projection function'.

Definition at line 452 of file BaseType.cc.

◆ toString()

string libdap::Sequence::toString ( )

virtual

Write out the object's internal fields in a string. To be used for debugging when regular inspection w/ddd or gdb isn't enough.

Returns: A string which shows the object's internal stuff.

Reimplemented from libdap::BaseType.

Definition at line 277 of file Sequence.cc.

◆ transfer_attributes()

void libdap::Constructor::transfer_attributes ( AttrTable * at_container )

virtualinherited

Transfer attributes from a DAS object into this variable. Because of the rough history of the DAS object and the way that various server code built the DAS, this is necessarily a heuristic process. The intent is that this method will be overridden by handlers that need to look for certain patterns in the DAS (e.g., hdf4's odd variable_dim_n; where n = 0, 1, 2, ...) attribute containers.

There should be a one-to-one mapping between variables and attribute containers. However, in some cases one variable has attributes spread across several top level containers and in some cases one container is used by several variables

Note: This method is technically unnecessary because a server (or client) can easily add attributes directly using the DDS::get_attr_table or BaseType::get_attr_table methods and then poke values in using any of the methods AttrTable provides. This method exists to ease the transition to DDS objects which contain attribute information for the existing servers (Since they all make DAS objects separately from the DDS). They could be modified to use the same AttrTable methods but operate on the AttrTable instances in a DDS/BaseType instead of those in a DAS.

Parameters

at_container Transfer attributes from this container.

Returns: void

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid.

Definition at line 844 of file Constructor.cc.

◆ transform_to_dap2()

std::vector< BaseType * > * libdap::BaseType::transform_to_dap2 ( AttrTable * parent_attr_table )

virtualinherited

DAP4 to DAP2 transform.

For the current BaseType, return a DAP2 'copy' of the variable.

Note

For most DAP4 types, in this implementation of DAP2 the corresponding DAP4 type is the same. These types have a different representations in DAP2 and DAP4: Sequences (which are D4Sequences in the DAP4 implementation),

Grids (which are semantically subsumed by coverages in DAP4)
Arrays (which use shared dimensions in DAP4)

Additionally DAP4 adds the following types:

UInt8, Int8, and Char which map to Byte in DAP2.
Int64, Unit64 which have no natural representation in DAP2.
Opaque Possible Byte stuff[] plus metadata?
Enum's can be represented as Int32.
Groups, with the exception of the root group "disappear" into the names of their member variables. Specifically the Group name is add as a prefix followed by a "/" separator to the names of all of the Group's member groups variables.

Parameters

The	AttrTable pointer parent_attr_table is used by Groups, which disappear from the DAP2 representation. Their children are returned in the the BAseType vector their attributes are added to parent_attr_table;

Returns: A pointer to a vector of BaseType pointers (right?). In most cases this vector will contain a single pointer but DAP4 types 'disappear' such as Group will return all of their member variables in the vector. DAP4 types with no representation in DAP2 (ex: UInt64) the will return a NULL pointer and so this must be tested!

Reimplemented in libdap::Array, libdap::D4Enum, libdap::D4Group, libdap::D4Opaque, libdap::Byte, libdap::Structure, libdap::Int64, libdap::UInt64, and libdap::Int8.

Definition at line 259 of file BaseType.cc.

◆ transform_to_dap4()

void libdap::Sequence::transform_to_dap4	(	D4Group *	root,
		Constructor *	container
	)

virtual

Build a D4Sequence from a DAP2 Sequence.

Because DAP4 uses a different type for sequences, this code must be subclassed by anything other than trivial test code or client side-only uses of the library.

Note: This version of transformto_dap4() builds a new type of object, so it must be subclassed.

Parameters

root	Use this as the environment for D4Dimensions
container	Load the result into this container

Returns: The new D4Sequence

Reimplemented from libdap::Constructor.

Definition at line 212 of file Sequence.cc.

◆ type()

Type libdap::BaseType::type ( ) const

virtualinherited

Returns the type of the class instance.

Definition at line 365 of file BaseType.cc.

◆ type_name()

string libdap::BaseType::type_name ( ) const

virtualinherited

Returns the type of the class instance as a string.

Definition at line 379 of file BaseType.cc.

◆ val2buf()

virtual unsigned int libdap::Constructor::val2buf	(	void *	val,
		bool	reuse
	)

inlinevirtualinherited

Loads class data.

Store the value pointed to by val in the object's internal buffer. This function does not perform any checks, so users must be sure that the thing pointed to can actually be stored in the object's buffer.

Only simple objects (Int, Float, Byte, and so on) and arrays of these simple objects may be stored using this function. To put data into more complex constructor types, use the functions provided by that class.

Deprecated:: Use set_value() in the leaf classes.

Parameters

val	A pointer to the data to be inserted into the class data buffer.
reuse	A boolean value, indicating whether the class internal data storage can be reused or not. If this argument is TRUE, the class buffer is assumed to be large enough to hold the incoming data, and it is not reallocated. If FALSE, new storage is allocated. If the internal buffer has not been allocated at all, this argument has no effect. This is currently used only in the Vector class.

Returns: The size (in bytes) of the information copied from val.

See also: Grid; Vector::val2buf

Implements libdap::BaseType.

Definition at line 115 of file Constructor.h.

◆ value()

SequenceValues libdap::Sequence::value ( )

virtual

Get the value for this sequence.

Returns: The SequenceValues object for this Sequence.

Definition at line 344 of file Sequence.cc.

◆ value_ref()

SequenceValues & libdap::Sequence::value_ref ( )

virtual

Get the value for this sequence.

Returns: The SequenceValues object for this Sequence.

Definition at line 352 of file Sequence.cc.

◆ var() [1/2]

BaseType * libdap::Constructor::var	(	const string &	name,
		bool	exact_match = `true`,
		btp_stack *	s = `0`
	)

virtualinherited

btp_stack no longer needed; use back pointers (BaseType::get_parent())

Reimplemented from libdap::BaseType.

Definition at line 267 of file Constructor.cc.

◆ var() [2/2]

BaseType * libdap::Constructor::var	(	const string &	n,
		btp_stack &	s
	)

virtualinherited

Deprecated:

Deprecated:: See comment in BaseType

Reimplemented from libdap::BaseType.

Definition at line 279 of file Constructor.cc.

◆ var_begin()

Constructor::Vars_iter libdap::Constructor::var_begin ( )

inherited

Returns an iterator referencing the first structure element.

Definition at line 356 of file Constructor.cc.

◆ var_end()

Constructor::Vars_iter libdap::Constructor::var_end ( )

inherited

Returns an iterator referencing the end of the list of structure elements. Does not reference the last structure element.

Definition at line 364 of file Constructor.cc.

◆ var_rbegin()

Constructor::Vars_riter libdap::Constructor::var_rbegin ( )

inherited

Return a reverse iterator that references the last element.

Definition at line 371 of file Constructor.cc.

◆ var_rend()

Constructor::Vars_riter libdap::Constructor::var_rend ( )

inherited

Return a reverse iterator that references a point 'before' the first element.

Definition at line 379 of file Constructor.cc.

◆ var_value() [1/2]

BaseType * libdap::Sequence::var_value	(	size_t	row,
		const string &	name
	)

virtual

Get the BaseType pointer to the named variable of a given row.

Parameters

row	Read from row in the sequence.
name	Return name from row.

Returns: A BaseType which holds the variable and its value.

See also: number_of_rows

Definition at line 363 of file Sequence.cc.

◆ var_value() [2/2]

BaseType * libdap::Sequence::var_value	(	size_t	row,
		size_t	i
	)

virtual

Get the BaseType pointer to the $i^{th}$ variable of row.

Parameters

row	Read from row in the sequence.
i	Return the $i^{th}$ variable from row.

Returns: A BaseType which holds the variable and its value.

See also: number_of_rows

Definition at line 385 of file Sequence.cc.

◆ width()

unsigned int libdap::Constructor::width ( bool constrained = false ) const

virtualinherited

This version of width simply returns the same thing as width() for simple types and Arrays. For Structure it returns the total size if constrained is false, or the size of the elements in the current projection if true.

Parameters

constrained If true, return the size after applying a constraint.

Returns: The number of bytes used by the variable.

Reimplemented from libdap::BaseType.

Definition at line 249 of file Constructor.cc.

The documentation for this class was generated from the following files:

Public Types

Public Member Functions

Static Public Member Functions

Protected Types

Protected Member Functions

Protected Attributes

Friends

Detailed Description

Constructor & Destructor Documentation

◆ Sequence() [1/3]

◆ Sequence() [2/3]

◆ Sequence() [3/3]

Member Function Documentation

◆ add_var()

◆ add_var_nocopy()

◆ attributes()

◆ buf2val()

◆ check_semantics()

◆ clear_local_data()

◆ compute_checksum()

◆ d4_ops()

◆ dataset()

◆ del_var()

◆ deserialize() [1/2]

◆ deserialize() [2/2]

◆ dump()

◆ element_count()

◆ FQN()

◆ get_attr_table()

◆ get_ending_row_number()

◆ get_parent()

◆ get_row_stride()

◆ get_starting_row_number()

◆ get_unsent_data()

◆ get_var_index()

◆ get_vars_iter()

◆ intern_data() [1/2]

◆ intern_data() [2/2]

◆ is_constructor_type()

◆ is_dap2_only_type()

◆ is_in_selection()

◆ is_linear()

◆ is_simple_type()

◆ is_vector_type()

◆ length()

◆ m_duplicate()

◆ name()

◆ ops()

◆ print_dap4()

◆ print_decl() [1/2]

◆ print_decl() [2/2]

◆ print_val() [1/2]

◆ print_val() [2/2]

◆ print_xml() [1/2]

◆ print_xml() [2/2]

◆ print_xml_writer()

◆ ptr_duplicate()

◆ read()

◆ read_p()

◆ read_row()

◆ reset_row_number() [1/2]

◆ reset_row_number() [2/2]

◆ row_value()

◆ send_p()

◆ serialize() [1/2]

◆ serialize() [2/2]

◆ set_attr_table()

◆ set_in_selection()

◆ set_leaf_sequence()

◆ set_length()

◆ set_name()

◆ set_parent()

◆ set_read_p()

◆ set_row_number_constraint()

◆ set_send_p()

◆ set_synthesized_p()

◆ set_type()

◆ set_unsent_data()

◆ set_value()

◆ synthesized_p()