#include <DDXParserSAX2.h>

Public Member Functions
	DDXParser (BaseTypeFactory *factory)

void	intern (const string &document, DDS *dest_dds, string &cid)

void	intern_stream (FILE in, DDS dds, string &cid, const string &boundary="")
	Read the DDX from a stream instead of a file. More...

void	intern_stream (istream &in, DDS *dds, string &cid, const string &boundary="")

Static Public Member Functions
SAX Parser Callbacks
These methods are declared static in the class header. This gives them C linkage which allows them to be used as callbacks by the SAX parser engine.
static void	ddx_start_document (void *parser)

static void	ddx_end_document (void *parser)

static void	ddx_sax2_start_element (void parser, const xmlChar localname, const xmlChar prefix, const xmlChar URI, int nb_namespaces, const xmlChar namespaces, int nb_attributes, int nb_defaulted, const xmlChar attributes)

static void	ddx_sax2_end_element (void parser, const xmlChar localname, const xmlChar prefix, const xmlChar URI)

static void	ddx_get_characters (void parser, const xmlChar ch, int len)

static void	ddx_ignoreable_whitespace (void parser, const xmlChar ch, int len)

static void	ddx_get_cdata (void parser, const xmlChar value, int len)

static xmlEntityPtr	ddx_get_entity (void parser, const xmlChar name)

static void	ddx_fatal_error (void parser, const char msg,...)

Friends
class	DDXParserTest

Detailed Description

Parse the XML text which encodes the network/persistent representation of the DDX object. In the current implementation, the DDX is held by an instance of the class DDS which in turn holds variables which include attributes. That is, the binary implementation of a DDX uses the old DDS, BaseType and AttrTable classes, albeit arranged in a slightly new way.

This parser for the DDX document uses the SAX interface of libxml2. Static methods are used as callbacks for the SAX parser. These static methods are public because making them private complicates compilation. They should not be called by anything other than the intern method. They do not throw exceptions because exceptions from within callbacks are not reliable or portable. To signal errors, the methods record information in the DDXParser object. Once the error handler is called, construction of an DDX/DDS object ends even though the SAX parser still calls the various callback functions. The parser treats warnings, errors and fatal_errors the same way; when any are found parsing stops. The intern method throws an DDXParseFailed exception if an error was found.

Note that this class uses the C++-supplied default definitions for the default and copy constructors as well as the destructor and assignment operator.

See also: DDS

Definition at line 79 of file DDXParserSAX2.h.

Member Function Documentation

◆ ddx_end_document()

void libdap::DDXParser::ddx_end_document ( void * p )

static

Clean up after finishing a parse.

Parameters

p	The SAX parser

Definition at line 472 of file DDXParserSAX2.cc.

◆ ddx_fatal_error()

void libdap::DDXParser::ddx_fatal_error	(	void *	p,
		const char *	msg,
			...
	)

static

Process an XML fatal error. Note that SAX provides for warnings, errors and fatal errors. This code treats them all as fatal errors since there's typically no way to tell a user about the error since there's often no user interface for this software.

Parameters

p	The SAX parser
msg	A printf-style format string.

Definition at line 1000 of file DDXParserSAX2.cc.

◆ ddx_get_cdata()

void libdap::DDXParser::ddx_get_cdata	(	void *	p,
		const xmlChar *	value,
		int	len
	)

static

Get characters in a cdata block. DAP does not use CData, but XML in an OtherXML attribute (the value of that DAP attribute) might use it. This callback also allows CData when the parser is in the 'parser_unknown' state since some future DAP element might use it.

Definition at line 964 of file DDXParserSAX2.cc.

◆ ddx_get_characters()

void libdap::DDXParser::ddx_get_characters	(	void *	p,
		const xmlChar *	ch,
		int	len
	)

static

Process/accumulate character data. This may be called more than once for one logical clump of data. Only save character data when processing 'value' elements; throw away all other characters.

Definition at line 920 of file DDXParserSAX2.cc.

◆ ddx_get_entity()

xmlEntityPtr libdap::DDXParser::ddx_get_entity	(	void *	parser,
		const xmlChar *	name
	)

static

Handle the standard XML entities.

Parameters

parser	The SAX parser
name	The XML entity.

Definition at line 988 of file DDXParserSAX2.cc.

◆ ddx_ignoreable_whitespace()

void libdap::DDXParser::ddx_ignoreable_whitespace	(	void *	p,
		const xmlChar *	ch,
		int	len
	)

static

Read whitespace that's not really important for content. This is used only for the OtherXML attribute type to preserve formating of the XML. Doing so makes the attribute value far easier to read.

Definition at line 944 of file DDXParserSAX2.cc.

◆ ddx_start_document()

void libdap::DDXParser::ddx_start_document ( void * p )

static

Initialize the SAX parser state object. This object is passed to each callback as a void pointer. The initial state is parser_start.

Parameters

p	The SAX parser

Definition at line 451 of file DDXParserSAX2.cc.

◆ intern()

void libdap::DDXParser::intern	(	const string &	document,
		DDS *	dest_dds,
		string &	cid
	)

Parse a DDX document stored in a file. The XML in the document is parsed and a binary DDX is built. This implementation stores the result in a DDS object where each instance of BaseType can hold an AttrTable object.

Parameters

document	Read the DDX from this file.
dest_dds	Value/result parameter; dumps the information to this DDS instance.
cid	Value/result parameter; puts the href which references the `CID`.

Exceptions

DDXParseFailed Thrown if the XML document could not be read or parsed.

Definition at line 1196 of file DDXParserSAX2.cc.

◆ intern_stream() [1/2]

void libdap::DDXParser::intern_stream	(	FILE *	in,
		DDS *	dest_dds,
		string &	cid,
		const string &	boundary = `""`
	)

Read the DDX from a stream instead of a file.

See also: DDXParser::intern().

Definition at line 1127 of file DDXParserSAX2.cc.

◆ intern_stream() [2/2]

void libdap::DDXParser::intern_stream	(	istream &	in,
		DDS *	dest_dds,
		string &	cid,
		const string &	boundary = `""`
	)

Read a DDX from a C++ input stream and populate a DDS object.

Parameters

in
dds
cid
boundary

Definition at line 1055 of file DDXParserSAX2.cc.

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

Public Member Functions

Static Public Member Functions

Friends

Detailed Description

Member Function Documentation

◆ ddx_end_document()

◆ ddx_fatal_error()

◆ ddx_get_cdata()

◆ ddx_get_characters()

◆ ddx_get_entity()

◆ ddx_ignoreable_whitespace()

◆ ddx_start_document()

◆ intern()

◆ intern_stream() [1/2]

◆ intern_stream() [2/2]