XmlDocument Class Reference

Parses a text-based XML document and creates an XmlElement object from it. More...

#include <juce_XmlDocument.h>

Collaboration diagram for XmlDocument:

Public Member Functions
	XmlDocument (const String &documentText)
	Creates an XmlDocument from the xml text. More...
	XmlDocument (const File &file)
	Creates an XmlDocument from a file. More...
	~XmlDocument ()
	Destructor. More...
XmlElement *	getDocumentElement (bool onlyReadOuterDocumentElement=false)
	Creates an XmlElement object to represent the main document node. More...
const String &	getLastParseError () const noexcept
	Returns the parsing error that occurred the last time getDocumentElement was called. More...
void	setEmptyTextElementsIgnored (bool shouldBeIgnored) noexcept
	Sets a flag to change the treatment of empty text elements. More...
void	setInputSource (InputSource *newSource) noexcept
	Sets an input source object to use for parsing documents that reference external entities. More...

Static Public Member Functions
static XmlElement *	parse (const File &file)
	A handy static method that parses a file. More...
static XmlElement *	parse (const String &xmlData)
	A handy static method that parses some XML data. More...

Private Member Functions
String	expandEntity (const String &)
String	expandExternalEntity (const String &)
String	getFileContents (const String &) const
String	getParameterEntity (const String &)
XmlElement *	parseDocumentElement (String::CharPointerType, bool outer)
bool	parseDTD ()
bool	parseHeader ()
void	readChildElements (XmlElement &)
void	readEntity (String &)
juce_wchar	readNextChar () noexcept
XmlElement *	readNextElement (bool alsoParseSubElements)
void	readQuotedString (String &)
void	setLastError (const String &, bool carryOn)
void	skipNextWhiteSpace ()

Private Attributes
String	dtdText
bool	errorOccurred
bool	ignoreEmptyTextElements
String::CharPointerType	input
ScopedPointer< InputSource >	inputSource
String	lastError
bool	needToLoadDTD
String	originalText
bool	outOfData
StringArray	tokenisedDTD

Detailed Description

Parses a text-based XML document and creates an XmlElement object from it.

The parser will parse DTDs to load external entities but won't check the document for validity against the DTD.

e.g.

XmlDocument myDocument (File ("myfile.xml"));
ScopedPointer<XmlElement> mainElement (myDocument.getDocumentElement());

if (mainElement == nullptr)
{
    String error = myDocument.getLastParseError();
}
else
{
    ..use the element
}

Or you can use the static helper methods for quick parsing..

ScopedPointer<XmlElement> xml (XmlDocument::parse (myXmlFile));

if (xml != nullptr && xml->hasTagName ("foobar"))
{
    ...etc

See also

XmlElement

Constructor & Destructor Documentation

XmlDocument() [1/2]

XmlDocument::XmlDocument

(

const String &

documentText

)

Creates an XmlDocument from the xml text.

The text doesn't actually get parsed until the getDocumentElement() method is called.

XmlDocument() [2/2]

XmlDocument::XmlDocument

(

const File &

file

)

Creates an XmlDocument from a file.

The text doesn't actually get parsed until the getDocumentElement() method is called.

~XmlDocument()

XmlDocument::~XmlDocument

(

)

Destructor.

Member Function Documentation

expandEntity()

String XmlDocument::expandEntity ( const String &  )

private

expandExternalEntity()

String XmlDocument::expandExternalEntity ( const String &  )

private

getDocumentElement()

XmlElement* XmlDocument::getDocumentElement

(

bool

onlyReadOuterDocumentElement = false

)

Creates an XmlElement object to represent the main document node.

This method will do the actual parsing of the text, and if there's a parse error, it may returns nullptr (and you can find out the error using the getLastParseError() method).

See also the parse() methods, which provide a shorthand way to quickly parse a file or string.

Parameters

onlyReadOuterDocumentElement

if true, the parser will only read the first section of the file, and will only return the outer document element - this allows quick checking of large files to see if they contain the correct type of tag, without having to parse the entire file

Returns

a new XmlElement which the caller will need to delete, or null if there was an error.

See also

getLastParseError

getFileContents()

String XmlDocument::getFileContents ( const String &  ) const

private

getLastParseError()

const String& XmlDocument::getLastParseError ( ) const

noexcept

Returns the parsing error that occurred the last time getDocumentElement was called.

Returns

the error, or an empty string if there was no error.

getParameterEntity()

String XmlDocument::getParameterEntity ( const String &  )

private

parse() [1/2]

static XmlElement* XmlDocument::parse ( const File &  file )

static

A handy static method that parses a file.

This is a shortcut for creating an XmlDocument object and calling getDocumentElement() on it.

Returns

a new XmlElement which the caller will need to delete, or null if there was an error.

parse() [2/2]

static XmlElement* XmlDocument::parse ( const String &  xmlData )

static

A handy static method that parses some XML data.

This is a shortcut for creating an XmlDocument object and calling getDocumentElement() on it.

Returns

a new XmlElement which the caller will need to delete, or null if there was an error.

parseDocumentElement()

XmlElement* XmlDocument::parseDocumentElement ( String::CharPointerType  , bool  outer  )

private

parseDTD()

bool XmlDocument::parseDTD ( )

private

parseHeader()

bool XmlDocument::parseHeader ( )

private

readChildElements()

void XmlDocument::readChildElements ( XmlElement &  )

private

readEntity()

void XmlDocument::readEntity ( String &  )

private

readNextChar()

juce_wchar XmlDocument::readNextChar ( )

privatenoexcept

readNextElement()

XmlElement* XmlDocument::readNextElement ( bool  alsoParseSubElements )

private

readQuotedString()

void XmlDocument::readQuotedString ( String &  )

private

setEmptyTextElementsIgnored()

void XmlDocument::setEmptyTextElementsIgnored ( bool  shouldBeIgnored )

noexcept

Sets a flag to change the treatment of empty text elements.

If this is true (the default state), then any text elements that contain only whitespace characters will be ingored during parsing. If you need to catch whitespace-only text, then you should set this to false before calling the getDocumentElement() method.

setInputSource()

void XmlDocument::setInputSource ( InputSource *  newSource )

noexcept

Sets an input source object to use for parsing documents that reference external entities.

If the document has been created from a file, this probably won't be needed, but if you're parsing some text and there might be a DTD that references external files, you may need to create a custom input source that can retrieve the other files it needs.

The object that is passed-in will be deleted automatically when no longer needed.

See also

InputSource

setLastError()

void XmlDocument::setLastError ( const String &  , bool  carryOn  )

private

skipNextWhiteSpace()

void XmlDocument::skipNextWhiteSpace ( )

private

Member Data Documentation

dtdText

String XmlDocument::dtdText

private

errorOccurred

bool XmlDocument::errorOccurred

private

ignoreEmptyTextElements

bool XmlDocument::ignoreEmptyTextElements

private

input

String::CharPointerType XmlDocument::input

private

inputSource

ScopedPointer<InputSource> XmlDocument::inputSource

private

lastError

String XmlDocument::lastError

private

needToLoadDTD

bool XmlDocument::needToLoadDTD

private

originalText

String XmlDocument::originalText

private

outOfData

bool XmlDocument::outOfData

private

tokenisedDTD

StringArray XmlDocument::tokenisedDTD

private

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

• juce_XmlDocument.h