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285 lines
10 KiB
C++
285 lines
10 KiB
C++
#ifndef HandlerBaseH
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#define HandlerBaseH
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// SAX default handler base class.
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// $Id$
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#include <string>
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#include "EntityResolver.h"
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#include "DTDHandler.h"
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#include "DocumentHandler.h"
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#include "ErrorHandler.h"
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#include "Locator.h"
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#include "AttributeList.h"
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#include "SAXException.h"
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namespace SAX
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{
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/**
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* Default base class for handlers.
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*
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* <p>This class implements the default behaviour for four SAX1
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* interfaces: EntityResolver, DTDHandler, DocumentHandler,
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* and ErrorHandler. It is now obsolete, but is included in SAX2 to
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* support legacy SAX1 applications. SAX2 applications should use
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* the {@link basic_DefaultHandler DefaultHandler}
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* class instead.</p>
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*
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* <p>Application writers can extend this class when they need to
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* implement only part of an interface; parser writers can
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* instantiate this class to provide default handlers when the
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* application has not supplied its own.</p>
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*
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* <p>Note that the use of this class is optional.</p>
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*
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* @deprecated This class works with the deprecated
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* {@link basic_DocumentHandler DocumentHandler}
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* interface. It has been replaced by the SAX2
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* {@link basic_DefaultHandler DefaultHandler}
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* class.
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* @since SAX 1.0
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* @author Jez Higgins, <a href="mailto:jez@jezuk.co.uk">jez@jezuk.co.uk</a>
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* @version 1.0
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* @see basic_EntityResolver
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* @see basic_DTDHandler
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* @see basic_DocumentHandler
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* @see basic_ErrorHandler
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*/
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template<class string_type>
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class basic_HandlerBase : public basic_EntityResolver<string_type>,
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public basic_DTDHandler<string_type>,
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public basic_DocumentHandler<string_type>,
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public ErrorHandler
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{
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public:
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typedef string_name stringT;
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typedef basic_Locator<stringT> LocatorT;
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typedef basic_AttributeList<stringT> AttributeListT;
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typedef basic_InputSource<stringT> InputSourceT;
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virtual ~basic_HandlerBase() { }
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//////////////////////////////////////////////////////////////////////
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// Default implementation of the EntityResolver interface.
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//////////////////////////////////////////////////////////////////////
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/**
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* Resolve an external entity.
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*
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* <p>Always return null, so that the parser will use the system
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* identifier provided in the XML document. This method implements
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* the SAX default behaviour: application writers can override it
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* in a subclass to do special translations such as catalog lookups
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* or URI redirection.</p>
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*
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* @param publicId The public identifer, or null if none is
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* available.
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* @param systemId The system identifier provided in the XML
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* document.
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* @return The new input source, or null to require the
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* default behaviour.
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* @see basic_EntityResolver#resolveEntity
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*/
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virtual InputSourceT resolveEntity(const stringT&, const stringT&)
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{
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return InputSourceT();
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} // resolverEntity
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//////////////////////////////////////////////////////////////////////
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// Default implementation of DTDHandler interface.
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//////////////////////////////////////////////////////////////////////
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/**
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* Receive notification of a notation declaration.
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*
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* <p>By default, do nothing. Application writers may override this
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* method in a subclass if they wish to keep track of the notations
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* declared in a document.</p>
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*
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* @param name The notation name.
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* @param publicId The notation public identifier, or null if not
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* available.
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* @param systemId The notation system identifier.
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* @see basic_DTDHandler#notationDecl
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*/
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virtual void notationDecl(const stringT&,
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const stringT&,
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const stringT&) { }
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/**
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* Receive notification of an unparsed entity declaration.
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*
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* <p>By default, do nothing. Application writers may override this
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* method in a subclass to keep track of the unparsed entities
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* declared in a document.</p>
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*
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* @param name The entity name.
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* @param publicId The entity public identifier, or null if not
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* available.
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* @param systemId The entity system identifier.
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* @param notationName The name of the associated notation.
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* @see basic_DTDHandler#unparsedEntityDecl
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*/
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virtual void unparsedEntityDecl(const stringT&,
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const stringT&,
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const stringT&,
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const stringT&) { }
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//////////////////////////////////////////////////////////////////////
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// Default implementation of DocumentHandler interface.
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//////////////////////////////////////////////////////////////////////
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/**
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* Receive a Locator object for document events.
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*
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* <p>By default, do nothing. Application writers may override this
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* method in a subclass if they wish to store the locator for use
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* with other document events.</p>
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*
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* @param locator A locator for all SAX document events.
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* @see basic_DocumentHandler#setDocumentLocator
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* @see basic_Locator
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*/
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virtual void setDocumentLocator(const LocatorT&) { }
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/**
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* Receive notification of the beginning of the document.
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*
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* <p>By default, do nothing. Application writers may override this
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* method in a subclass to take specific actions at the beginning
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* of a document (such as allocating the root node of a tree or
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* creating an output file).</p>
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*
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* @see basic_DocumentHandler#startDocument
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*/
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virtual void startDocument() { }
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/**
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* Receive notification of the end of the document.
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*
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* <p>By default, do nothing. Application writers may override this
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* method in a subclass to take specific actions at the beginning
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* of a document (such as finalising a tree or closing an output
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* file).</p>
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*
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* @see basic_DocumentHandler#endDocument
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*/
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virtual void endDocument() { }
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/**
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* Receive notification of the start of an element.
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*
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* <p>By default, do nothing. Application writers may override this
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* method in a subclass to take specific actions at the start of
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* each element (such as allocating a new tree node or writing
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* output to a file).</p>
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*
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* @param name The element type name.
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* @param attributes The specified or defaulted attributes.
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* @see basic_DocumentHandler#startElement
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*/
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virtual void startElement(const stringT&, const AttributeListT&) { }
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/**
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* Receive notification of the end of an element.
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*
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* <p>By default, do nothing. Application writers may override this
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* method in a subclass to take specific actions at the end of
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* each element (such as finalising a tree node or writing
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* output to a file).</p>
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*
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* @param name The element type name.
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* @param attributes The specified or defaulted attributes.
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* @see basic_DocumentHandler#endElement
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*/
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virtual void endElement(const stringT&) { }
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/**
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* Receive notification of character data inside an element.
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*
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* <p>By default, do nothing. Application writers may override this
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* method to take specific actions for each chunk of character data
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* (such as adding the data to a node or buffer, or printing it to
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* a file).</p>
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*
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* @param ch The characters.
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* @see basic_DocumentHandler#characters
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*/
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virtual void characters(const stringT&) { }
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/**
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* Receive notification of ignorable whitespace in element content.
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*
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* <p>By default, do nothing. Application writers may override this
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* method to take specific actions for each chunk of ignorable
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* whitespace (such as adding data to a node or buffer, or printing
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* it to a file).</p>
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*
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* @param ch The whitespace characters.
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* @see basic_DocumentHandler#ignorableWhitespace
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*/
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virtual void ignorableWhitespace(const stringT&) { }
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/**
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* Receive notification of a processing instruction.
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*
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* <p>By default, do nothing. Application writers may override this
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* method in a subclass to take specific actions for each
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* processing instruction, such as setting status variables or
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* invoking other methods.</p>
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*
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* @param target The processing instruction target.
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* @param data The processing instruction data, or null if
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* none is supplied.
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* @see basic_DocumentHandler#processingInstruction
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*/
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virtual void processingInstruction(const stringT&, const stringT&) { }
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//////////////////////////////////////////////////////////////////////
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// Default implementation of the ErrorHandler interface.
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//////////////////////////////////////////////////////////////////////
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/**
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* Receive notification of a parser warning.
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*
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* <p>The default implementation does nothing. Application writers
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* may override this method in a subclass to take specific actions
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* for each warning, such as inserting the message in a log file or
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* printing it to the console.</p>
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*
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* @param e The warning information encoded as an exception.
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* @see basic_ErrorHandler#warning
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* @see basic_SAXParseException
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*/
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virtual void warning(const SAXException&) { }
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/**
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* Receive notification of a recoverable parser error.
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*
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* <p>The default implementation does nothing. Application writers
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* may override this method in a subclass to take specific actions
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* for each error, such as inserting the message in a log file or
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* printing it to the console.</p>
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*
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* @param e The warning information encoded as an exception.
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* @see basic_ErrorHandler#warning
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* @see basic_SAXParseException
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*/
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virtual void error(const SAXException&) { }
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/**
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* Report a fatal XML parsing error.
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*
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* <p>The default implementation throws a SAXParseException.
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* Application writers may override this method in a subclass if
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* they need to take specific actions for each fatal error (such as
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* collecting all of the errors into a single report): in any case,
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* the application must stop all regular processing when this
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* method is invoked, since the document is no longer reliable, and
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* the parser may no longer report parsing events.</p>
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*
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* @param e The error information encoded as an exception.
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* @see basic_ErrorHandler#fatalError
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* @see basic_SAXParseException
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*/
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virtual void fatalError(const SAXException& e) { throw e; }
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}; // class HandlerBase
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typedef basic_HandlerBase<std::string> HandlerBase;
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typedef basic_HandlerBase<std::wstring> wHandlerBase;
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}; // namespace SAX
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#endif
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// end of file
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