#include <Constructor.h>

Inheritance diagram for libdap::Constructor:

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 bool	deserialize (UnMarshaller &um, DDS *dds, bool reuse=false)
	Receive data from the net. More...

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

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 BaseType *	get_parent () const

BaseType *	get_var_index (int i)

Vars_iter	get_vars_iter (int i)

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

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

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_dap4 () const

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

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
	How many elements are in this variable. More...

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

Constructor &	operator= (const Constructor &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_val (FILE *out, string space="", bool print_decl_p=true)
	Prints the value of the variable. More...

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

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 ()=0

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

virtual bool	serialize (ConstraintEvaluator &eval, DDS &dds, Marshaller &m, bool ce_eval=true)
	Move data to the net, then remove them from the object. More...

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

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_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_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...

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 dest)
	DAP2 to DAP4 transform. More...

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 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 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 Member Functions
	Constructor (const string &name, const Type &type, bool is_dap4=false)

	Constructor (const string &name, const string &d, const Type &type, bool is_dap4=false)

	Constructor (const Constructor &copy_from)

void	m_duplicate (const Constructor &s)

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

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

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

Protected Attributes
bool	d_in_selection

bool	d_is_synthesized

std::vector< BaseType * >	d_vars

Detailed Description

Common methods for all constructor types.

Definition at line 43 of file Constructor.h.

Constructor & Destructor Documentation

◆ Constructor()

libdap::Constructor::Constructor	(	const string &	name,
		const string &	dataset,
		const Type &	type,
		bool	is_dap4 = `false`
	)

protected

Server-side constructor that takes the name of the variable to be created, the dataset name from which this variable is being created, and the type of data being stored in the Constructor. This is a protected constructor, available only to derived classes of Constructor

Parameters

name	string containing the name of the variable to be created
dataset	string containing the name of the dataset from which this variable is being created
type	type of data being stored

Definition at line 106 of file Constructor.cc.

Member Function Documentation

◆ add_var()

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

virtual

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`
	)

virtual

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 )

inlinevirtual

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`
	)

virtual

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()

virtual void libdap::BaseType::clear_local_data ( )

inlinevirtualinherited

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 in libdap::Sequence, libdap::Vector, libdap::D4Sequence, and libdap::D4Opaque.

Definition at line 179 of file BaseType.h.

◆ compute_checksum()

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

virtual

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 )

virtual

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]

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

virtual

Receive data from the net.

Receives data from the network connection identified by the source parameter. The data is put into the class data buffer according to the input dds.

This function is only used on the client side of the DODS client/server connection.

Parameters

um	An UnMarshaller that knows how to deserialize data types
dds	The Data Descriptor Structure object corresponding to this dataset. See The DODS User Manual for information about this structure. This would have been received from the server in an earlier transmission.
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.

Returns: Always returns TRUE.

Exceptions

Error when a problem reading from the UnMarshaller is found.

See also: DDS

Reimplemented from libdap::BaseType.

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

Definition at line 540 of file Constructor.cc.

◆ deserialize() [2/2]

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

virtual

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.

◆ dump()

void libdap::Constructor::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::BaseType.

Reimplemented in libdap::Sequence, libdap::D4Sequence, libdap::Grid, and libdap::Structure.

Definition at line 913 of file Constructor.cc.

◆ element_count()

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

virtual

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

virtual

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_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_var_index()

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

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 )

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	(	ConstraintEvaluator &	eval,
		DDS &	dds
	)

virtual

Similar to using serialize() and deserialize() together in one object. Data are read as for serialize and those values are stored in the objects as deserialize() does but does not write and then read data to/from a stream.

This method is defined by the various data type classes. It calls the read() abstract method. Unlike serialize(), this method does not clear the memory use to hold the data values, so the caller should make sure to delete the DDS or the variable as soon as possible.

Parameters

eval	Use this as the constraint expression evaluator.
dds	The Data Descriptor Structure object corresponding to this dataset. See The DODS User Manual for information about this structure.

Reimplemented from libdap::BaseType.

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

Definition at line 490 of file Constructor.cc.

◆ intern_data() [2/2]

void libdap::Constructor::intern_data ( )

virtual

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.

◆ 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_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::Constructor::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 in libdap::Sequence, and libdap::Structure.

Definition at line 823 of file Constructor.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()

virtual int libdap::BaseType::length ( ) const

inlinevirtualinherited

How many elements are in this variable.

Todo:: change the return type to int64_t

Returns: The number of elements; 1 for scalars

Reimplemented in libdap::Sequence, libdap::D4Sequence, libdap::Vector, libdap::Str, and libdap::D4Opaque.

Definition at line 207 of file BaseType.h.

◆ 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`
	)

virtual

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`
	)

virtual

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`
	)

virtual

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::Constructor::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::BaseType.

Reimplemented in libdap::Sequence, and libdap::Grid.

Definition at line 650 of file Constructor.cc.

◆ print_val() [2/2]

void libdap::Constructor::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.

Implements libdap::BaseType.

Reimplemented in libdap::D4Sequence, libdap::Sequence, and libdap::Grid.

Definition at line 658 of file Constructor.cc.

◆ print_xml() [1/2]

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

virtual

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`
	)

virtual

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`
	)

virtual

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()

virtual BaseType* libdap::BaseType::ptr_duplicate ( )

pure virtualinherited

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.

Implemented in libdap::Sequence, libdap::Array, libdap::D4Sequence, libdap::Grid, libdap::Vector, libdap::D4Enum, libdap::Structure, libdap::Url, libdap::Int32, libdap::D4Group, libdap::Byte, libdap::Str, libdap::Float32, libdap::Float64, libdap::Int16, libdap::UInt32, libdap::Int64, libdap::UInt16, libdap::UInt64, libdap::Int8, and libdap::D4Opaque.

◆ read()

bool libdap::Constructor::read ( )

virtual

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.

◆ 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]

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

virtual

Move data to the net, then remove them from the object.

Sends the data from the indicated (local) dataset through the connection identified by the Marshaller parameter. If the data is not already incorporated into the DDS object, read the data from the dataset. Once the data are sent (written to the Marshaller), they are deleted from the object and the object state is reset so that they will be read again if the read() method is called.

This function is only used on the server side of the client/server connection, and is generally only called from the ResponseBuilder functions. It has no BaseType implementation; each datatype child class supplies its own implementation.

@param eval Use this as the constraint expression evaluator.

Parameters

dds	The Data Descriptor Structure object corresponding to this dataset. See The DODS User Manual for information about this structure.
m	A marshaller used to serialize data types
ce_eval	A boolean value indicating whether to evaluate the DODS constraint expression that may accompany this dataset. The constraint expression is stored in the dds.

Returns: This method always returns true. Older versions used the return value to signal success or failure.

Note: We changed the default behavior of this method so that it calls BaseType::clear_local_data() once the values are sent. This, combined with the behavior that read() is called by this method just before data are sent, means that data for any given variable remain in memory for the shortest time possible. Furthermore, since variables are serialized one at a time, no more than one variable's data will be in memory at any given time when using the default behavior. Some code - code that uses intern_data() or server functions - might alter this default behavior. Only Array (i.e. Vector), Sequence, D4Sequence and D4Opaque types actually hold data in dynamically allocated memory, so sonly those types have the new/changed behavior. This change was made on 7/5/15.

Exceptions

InternalErr.
Error.

See also: DDS

Reimplemented from libdap::BaseType.

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

Definition at line 504 of file Constructor.cc.

◆ serialize() [2/2]

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

virtual

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.

◆ 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 )

virtual

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_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 )

virtual

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_send_p()

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

virtual

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.

◆ 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::BaseType::toString ( )

virtualinherited

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 in libdap::Sequence.

Definition at line 184 of file BaseType.cc.

◆ transfer_attributes()

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

virtual

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::Constructor::transform_to_dap4	(	D4Group *	root,
		Constructor *	container
	)

virtual

DAP2 to DAP4 transform.

For the current BaseType, return a DAP4 'copy' of the variable.

Note: For most DAP2 types, in this implementation of DAP4 the corresponding DAP4 type is the same. The different types are Sequences (which are D4Sequences in the DAP4 implementation), Grids (which are coverages) and Arrays (which use shared dimensions).

Parameters

root	The root group that should hold this new variable. Add Group-level stuff here (e.g., D4Dimensions).
container	Add the new variable to this container.

Returns: A pointer to the transformed variable

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Sequence, libdap::Grid, and libdap::Structure.

Definition at line 141 of file Constructor.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
	)

inlinevirtual

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.

◆ var() [1/2]

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

virtual

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
	)

virtual

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 ( )

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 ( )

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 ( )

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 ( )

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

Definition at line 379 of file Constructor.cc.

◆ width()

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

virtual

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 Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ Constructor()

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_parent()

◆ get_var_index()

◆ get_vars_iter()

◆ intern_data() [1/2]

◆ intern_data() [2/2]

◆ is_constructor_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()

◆ send_p()

◆ serialize() [1/2]

◆ serialize() [2/2]

◆ set_attr_table()

◆ set_in_selection()

◆ set_length()

◆ set_name()

◆ set_parent()

◆ set_read_p()

◆ set_send_p()

◆ set_synthesized_p()

◆ set_type()

◆ synthesized_p()

◆ toString()

◆ transfer_attributes()

◆ transform_to_dap2()

◆ transform_to_dap4()

◆ type()

◆ type_name()

◆ val2buf()

◆ var() [1/2]

◆ var() [2/2]

◆ var_begin()

◆ var_end()

◆ var_rbegin()

◆ var_rend()

◆ width()