mirror of
https://github.com/jezhiggins/arabica
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383 lines
14 KiB
C++
383 lines
14 KiB
C++
#ifndef ARABICA_DEFAULT_HANDLER_H
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#define ARABICA_DEFAULT_HANDLER_H
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// DefaultHandler.h
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// $Id$
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#include <SAX/ArabicaConfig.h>
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#include <string>
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#include <SAX/EntityResolver.h>
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#include <SAX/DTDHandler.h>
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#include <SAX/ContentHandler.h>
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#include <SAX/ErrorHandler.h>
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#include <SAX/Locator.h>
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#include <SAX/Attributes.h>
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#include <SAX/SAXException.h>
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namespace SAX {
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/**
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* Default base class for SAX2 event handlers.
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*
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* <p>This class is available as a convenience base class for SAX2
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* applications: it provides default implementations for all of the
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* callbacks in the four core SAX2 handler classes:</p>
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*
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* <ul>
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* <li>{@link basic_EntityResolver EntityResolver}</li>
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* <li>{@link basic_DTDHandler DTDHandler}</li>
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* <li>{@link basic_ContentHandler ContentHandler}</li>
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* <li>{@link ErrorHandler ErrorHandler}</li>
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* </ul>
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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>This class replaces the deprecated SAX1
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* {@link basic_HandlerBase HandlerBase} class.</p>
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*
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* @since SAX 2.0
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* @author Jez Higgins,
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* <a href="mailto:jez@jezuk.co.uk">jez@jezuk.co.uk</a>
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* @version 2.0
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* @see basic_EntityResolver
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* @see basic_DTDHandler
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* @see basic_ContentHandler
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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_DefaultHandler : public basic_EntityResolver<string_type>,
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public basic_DTDHandler<string_type>,
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public basic_ContentHandler<string_type>,
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public basic_ErrorHandler<string_type>
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{
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public:
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typedef string_type stringT;
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typedef basic_InputSource<stringT> InputSourceT;
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typedef basic_Locator<stringT> LocatorT;
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typedef basic_Attributes<stringT> AttributesT;
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typedef basic_SAXParseException<stringT> SAXParseExceptionT;
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basic_DefaultHandler() { }
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virtual ~basic_DefaultHandler() { }
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//////////////////////////////////////////////
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// EntityResolver
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/**
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* Resolve an external entity.
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*
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* <p>Always return a default-constructed <code>InputSourceT</code>, so that
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* the parser will use the system identifier provided in the XML document.
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* This method implements the SAX default behaviour: application writers can
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* override it in a subclass to do special translations such as catalog
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* lookups or URI redirection.</p>
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*
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* @param publicId The public identifer, or an empty string 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, (empty to require the
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* default behaviour).
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* @exception SAXException Any SAX exception.
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* @see basic_EntityResolver#resolveEntity
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*/
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virtual InputSourceT resolveEntity(const stringT& /* publicId */, const stringT& /* systemId */)
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{
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return InputSourceT();
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} // resolveEntity
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//////////////////////////////////////////////
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// DTDHandler
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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 an empty string if not
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* available.
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* @param systemId The notation system identifier.
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* @exception SAXException Any SAX exception, possibly
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* wrapping another exception.
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* @see basic_DTDHandler#notationDecl
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*/
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virtual void notationDecl(const stringT& /* name */,
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const stringT& /* publicId */,
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const stringT& /* systemId */)
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{
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} // notationDecl
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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 an empty string 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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* @exception SAXException Any SAX exception, possibly
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* wrapping another exception.
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* @see basic_DTDHandler#unparsedEntityDecl
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*/
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virtual void unparsedEntityDecl(const stringT& /* name */,
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const stringT& /* publicId */,
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const stringT& /* systemId */,
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const stringT& /* notationName */)
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{
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} // unparsedEntityDecl
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////////////////////////////////////////////////////
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// ContentHandler
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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_ContentHandler#setDocumentLocator
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* @see basic_Locator
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*/
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virtual void setDocumentLocator(const LocatorT& /* locator */) { }
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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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* @exception SAXException Any SAX exception, possibly
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* wrapping another exception.
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* @see basic_ContentHandler#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 end
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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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* @exception SAXException Any SAX exception, possibly
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* wrapping another exception.
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* @see basic_ContentHandler#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 a Namespace mapping.
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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 Namespace prefix scope (such as storing the prefix mapping).</p>
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*
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* @param prefix The Namespace prefix being declared.
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* @param uri The Namespace URI mapped to the prefix.
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* @exception SAXException Any SAX exception, possibly
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* wrapping another exception.
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* @see basic_ContentHandler#startPrefixMapping
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*/
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virtual void startPrefixMapping(const stringT& /* prefix */, const stringT& /* uri */) { }
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/**
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* Receive notification of the end of a Namespace mapping.
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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 prefix mapping.</p>
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*
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* @param prefix The Namespace prefix being declared.
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* @exception SAXException Any SAX exception, possibly
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* wrapping another exception.
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* @see basic_ContentHandler#endPrefixMapping
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*/
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virtual void endPrefixMapping(const stringT& /* prefix */) { }
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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 namespaceURI The Namespace URI, or the empty string if the element
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* has no Namespace URI or if Namespace processing is not
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* being performed.
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* @param localName The local name (without prefix), or the empty string if
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* Namespace processing is not being performed.
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* @param qName The qualified name (with prefix), or the empty string if
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* qualified names are not available.
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* @param atts The attributes attached to the element. If there are no
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* attributes, it shall be an empty Attributes object.
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* @exception SAXException Any SAX exception, possibly
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* wrapping another exception.
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* @see basic_ContentHandler#startElement
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*/
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virtual void startElement(const stringT& /* namespaceURI */, const stringT& /* localName */,
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const stringT& /* qName */, const AttributesT& /* atts */) { }
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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 namespaceURI The Namespace URI, or the empty string if the element
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* has no Namespace URI or if Namespace processing is not
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* being performed.
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* @param localName The local name (without prefix), or the empty string if
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* Namespace processing is not being performed.
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* @param qName The qualified name (with prefix), or the empty string if
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* qualified names are not available.
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* @exception SAXException Any SAX exception, possibly
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* wrapping another exception.
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* @see basic_ContentHandler#endElement
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*/
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virtual void endElement(const stringT& /* namespaceURI */, const stringT& /* localName */,
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const stringT& /* qName */) { }
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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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* @exception SAXException Any SAX exception, possibly
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* wrapping another exception.
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* @see basic_ContentHandler#characters
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*/
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virtual void characters(const stringT& /* ch */) { }
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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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* @exception SAXException Any SAX exception, possibly
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* wrapping another exception.
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* @see basic_ContentHandler#ignorableWhitespace
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*/
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virtual void ignorableWhitespace(const stringT& /* ch */) { }
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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 an empty string if
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* none is supplied.
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* @exception SAXException Any SAX exception, possibly
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* wrapping another exception.
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* @see basic_ContentHandler#processingInstruction
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*/
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virtual void processingInstruction(const stringT& /* target */, const stringT& /* data */) { }
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/**
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* Receive notification of a skipped entity.
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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 name The name of the skipped entity.
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* @exception SAXException Any SAX exception, possibly
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* wrapping another exception.
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* @see basic_ContentHandler#processingInstruction
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*/
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virtual void skippedEntity(const stringT& /* name */) { }
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/////////////////////////////////////////////////////
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// ErrorHandler
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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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* @exception SAXException Any SAX exception, possibly
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* wrapping another exception.
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* @see basic_ErrorHandler#warning
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* @see SAXParseException
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*/
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virtual void warning(const SAXParseExceptionT& /* e */) { }
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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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* @exception SAXException Any SAX exception, possibly
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* wrapping another exception.
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* @see basic_ErrorHandler#error
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* @see SAXParseException
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*/
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virtual void error(const SAXParseExceptionT& /* e */) { }
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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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* @exception SAXException Any SAX exception, possibly
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* wrapping another exception.
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* @see basic_ErrorHandler#fatalError
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* @see SAXParseException
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*/
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virtual void fatalError(const SAXParseExceptionT& e)
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{
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throw SAXParseExceptionT(e);
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// VS.NET refuses throw e; saying the copy constructor is inaccessible
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// GCC likes throw e;
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// one of them, I presume, is wrong
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} // fatalError
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private:
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basic_DefaultHandler(const basic_DefaultHandler&);
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basic_DefaultHandler& operator=(const basic_DefaultHandler&);
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bool operator==(const basic_DefaultHandler&);
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}; // class basic_DefaultHandler
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typedef basic_DefaultHandler<std::string> DefaultHandler;
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#ifndef ARABICA_NO_WCHAR_T
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typedef basic_DefaultHandler<std::wstring> wDefaultHandler;
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#endif
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} // namespace SAX
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#endif
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