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* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* $Id: HandlerBase.hpp 568078 2007-08-21 11:43:25Z amassari $
*/
#ifndef HANDLERBASE_HPP
#define HANDLERBASE_HPP
#include <xercesc/sax/DocumentHandler.hpp>
#include <xercesc/sax/DTDHandler.hpp>
#include <xercesc/sax/EntityResolver.hpp>
#include <xercesc/sax/ErrorHandler.hpp>
#include <xercesc/sax/SAXParseException.hpp>
XERCES_CPP_NAMESPACE_BEGIN
class Locator;
class AttributeList;
/**
* Default base class for handlers.
*
* <p>This class implements the default behaviour for four SAX
* interfaces: EntityResolver, DTDHandler, DocumentHandler,
* and ErrorHandler.</p>
*
* <p>Application writers can extend this class when they need to
* implement only part of an interface; parser writers can
* instantiate this class to provide default handlers when the
* application has not supplied its own.</p>
*
* <p>Note that the use of this class is optional.</p>
*
* @see EntityResolver#EntityResolver
* @see DTDHandler#DTDHandler
* @see DocumentHandler#DocumentHandler
* @see ErrorHandler#ErrorHandler
*/
class SAX_EXPORT HandlerBase :
public EntityResolver, public DTDHandler, public DocumentHandler
, public ErrorHandler
{
public:
/** @name Default handlers for the DocumentHandler interface */
//@{
/**
* Receive notification of character data inside an element.
*
* <p>By default, do nothing. Application writers may override this
* method to take specific actions for each chunk of character data
* (such as adding the data to a node or buffer, or printing it to
* a file).</p>
*
* @param chars The characters.
* @param length The number of characters to use from the
* character array.
* @exception SAXException Any SAX exception, possibly
* wrapping another exception.
* @see DocumentHandler#characters
*/
virtual void characters
(
const XMLCh* const chars
, const unsigned int length
);
/**
* Receive notification of the end of the document.
*
* <p>By default, do nothing. Application writers may override this
* method in a subclass to take specific actions at the beginning
* of a document (such as finalising a tree or closing an output
* file).</p>
*
* @exception SAXException Any SAX exception, possibly
* wrapping another exception.
* @see DocumentHandler#endDocument
*/
virtual void endDocument();
/**
* Receive notification of the end of an element.
*
* <p>By default, do nothing. Application writers may override this
* method in a subclass to take specific actions at the end of
* each element (such as finalising a tree node or writing
* output to a file).</p>
*
* @param name The element type name.
* @exception SAXException Any SAX exception, possibly
* wrapping another exception.
* @see DocumentHandler#endElement
*/
virtual void endElement(const XMLCh* const name);
/**
* Receive notification of ignorable whitespace in element content.
*
* <p>By default, do nothing. Application writers may override this
* method to take specific actions for each chunk of ignorable
* whitespace (such as adding data to a node or buffer, or printing
* it to a file).</p>
*
* @param chars The whitespace characters.
* @param length The number of characters to use from the
* character array.
* @exception SAXException Any SAX exception, possibly
* wrapping another exception.
* @see DocumentHandler#ignorableWhitespace
*/
virtual void ignorableWhitespace
(
const XMLCh* const chars
, const unsigned int length
);
/**
* Receive notification of a processing instruction.
*
* <p>By default, do nothing. Application writers may override this
* method in a subclass to take specific actions for each
* processing instruction, such as setting status variables or
* invoking other methods.</p>
*
* @param target The processing instruction target.
* @param data The processing instruction data, or null if
* none is supplied.
* @exception SAXException Any SAX exception, possibly
* wrapping another exception.
* @see DocumentHandler#processingInstruction
*/
virtual void processingInstruction
(
const XMLCh* const target
, const XMLCh* const data
);
/**
* Reset the Docuemnt object on its reuse
*
* @see DocumentHandler#resetDocument
*/
virtual void resetDocument();
//@}
/** @name Default implementation of DocumentHandler interface */
//@{
/**
* Receive a Locator object for document events.
*
* <p>By default, do nothing. Application writers may override this
* method in a subclass if they wish to store the locator for use
* with other document events.</p>
*
* @param locator A locator for all SAX document events.
* @see DocumentHandler#setDocumentLocator
* @see Locator
*/
virtual void setDocumentLocator(const Locator* const locator);
/**
* Receive notification of the beginning of the document.
*
* <p>By default, do nothing. Application writers may override this
* method in a subclass to take specific actions at the beginning
* of a document (such as allocating the root node of a tree or
* creating an output file).</p>
*
* @exception SAXException Any SAX exception, possibly
* wrapping another exception.
* @see DocumentHandler#startDocument
*/
virtual void startDocument();
/**
* Receive notification of the start of an element.
*
* <p>By default, do nothing. Application writers may override this
* method in a subclass to take specific actions at the start of
* each element (such as allocating a new tree node or writing
* output to a file).</p>
*
* @param name The element type name.
* @param attributes The specified or defaulted attributes.
* @exception SAXException Any SAX exception, possibly
* wrapping another exception.
* @see DocumentHandler#startElement
*/
virtual void startElement
(
const XMLCh* const name
, AttributeList& attributes
);
//@}
/** @name Default implementation of the EntityResolver interface. */
//@{
/**
* Resolve an external entity.
*
* <p>Always return null, so that the parser will use the system
* identifier provided in the XML document. This method implements
* the SAX default behaviour: application writers can override it
* in a subclass to do special translations such as catalog lookups
* or URI redirection.</p>
*
* @param publicId The public identifer, or null if none is
* available.
* @param systemId The system identifier provided in the XML
* document.
* @return The new input source, or null to require the
* default behaviour.
* The returned InputSource is owned by the parser which is
* responsible to clean up the memory.
* @exception SAXException Any SAX exception, possibly
* wrapping another exception.
* @see EntityResolver#resolveEntity
*/
virtual InputSource* resolveEntity
(
const XMLCh* const publicId
, const XMLCh* const systemId
);
//@}
/** @name Default implementation of the ErrorHandler interface */
//@{
/**
* Receive notification of a recoverable parser error.
*
* <p>The default implementation does nothing. Application writers
* may override this method in a subclass to take specific actions
* for each error, such as inserting the message in a log file or
* printing it to the console.</p>
*
* @param exc The warning information encoded as an exception.
* @exception SAXException Any SAX exception, possibly
* wrapping another exception.
* @see ErrorHandler#warning
* @see SAXParseException#SAXParseException
*/
virtual void error(const SAXParseException& exc);
/**
* Report a fatal XML parsing error.
*
* <p>The default implementation throws a SAXParseException.
* Application writers may override this method in a subclass if
* they need to take specific actions for each fatal error (such as
* collecting all of the errors into a single report): in any case,
* the application must stop all regular processing when this
* method is invoked, since the document is no longer reliable, and
* the parser may no longer report parsing events.</p>
*
* @param exc The error information encoded as an exception.
* @exception SAXException Any SAX exception, possibly
* wrapping another exception.
* @see ErrorHandler#fatalError
* @see SAXParseException#SAXParseException
*/
virtual void fatalError(const SAXParseException& exc);
/**
* Receive notification of a parser warning.
*
* <p>The default implementation does nothing. Application writers
* may override this method in a subclass to take specific actions
* for each warning, such as inserting the message in a log file or
* printing it to the console.</p>
*
* @param exc The warning information encoded as an exception.
* @exception SAXException Any SAX exception, possibly
* wrapping another exception.
* @see ErrorHandler#warning
* @see SAXParseException#SAXParseException
*/
virtual void warning(const SAXParseException& exc);
/**
* Reset the Error handler object on its reuse
*
* @see ErrorHandler#resetErrors
*/
virtual void resetErrors();
//@}
/** @name Default implementation of DTDHandler interface. */
//@{
/**
* Receive notification of a notation declaration.
*
* <p>By default, do nothing. Application writers may override this
* method in a subclass if they wish to keep track of the notations
* declared in a document.</p>
*
* @param name The notation name.
* @param publicId The notation public identifier, or null if not
* available.
* @param systemId The notation system identifier.
* @see DTDHandler#notationDecl
*/
virtual void notationDecl
(
const XMLCh* const name
, const XMLCh* const publicId
, const XMLCh* const systemId
);
/**
* Reset the DTD object on its reuse
*
* @see DTDHandler#resetDocType
*/
virtual void resetDocType();
/**
* Receive notification of an unparsed entity declaration.
*
* <p>By default, do nothing. Application writers may override this
* method in a subclass to keep track of the unparsed entities
* declared in a document.</p>
*
* @param name The entity name.
* @param publicId The entity public identifier, or null if not
* available.
* @param systemId The entity system identifier.
* @param notationName The name of the associated notation.
* @see DTDHandler#unparsedEntityDecl
*/
virtual void unparsedEntityDecl
(
const XMLCh* const name
, const XMLCh* const publicId
, const XMLCh* const systemId
, const XMLCh* const notationName
);
//@}
HandlerBase() {};
virtual ~HandlerBase() {};
private:
// -----------------------------------------------------------------------
// Unimplemented constructors and operators
// -----------------------------------------------------------------------
HandlerBase(const HandlerBase&);
HandlerBase& operator=(const HandlerBase&);
};
// ---------------------------------------------------------------------------
// HandlerBase: Inline default implementations
// ---------------------------------------------------------------------------
inline void HandlerBase::characters(const XMLCh* const
, const unsigned int)
{
}
inline void HandlerBase::endDocument()
{
}
inline void HandlerBase::endElement(const XMLCh* const)
{
}
inline void HandlerBase::error(const SAXParseException&)
{
}
inline void HandlerBase::fatalError(const SAXParseException& exc)
{
throw exc;
}
inline void
HandlerBase::ignorableWhitespace( const XMLCh* const
, const unsigned int)
{
}
inline void HandlerBase::notationDecl( const XMLCh* const
, const XMLCh* const
, const XMLCh* const)
{
}
inline void
HandlerBase::processingInstruction( const XMLCh* const
, const XMLCh* const)
{
}
inline void HandlerBase::resetErrors()
{
}
inline void HandlerBase::resetDocument()
{
}
inline void HandlerBase::resetDocType()
{
}
inline InputSource*
HandlerBase::resolveEntity( const XMLCh* const
, const XMLCh* const)
{
return 0;
}
inline void
HandlerBase::unparsedEntityDecl(const XMLCh* const
, const XMLCh* const
, const XMLCh* const
, const XMLCh* const)
{
}
inline void HandlerBase::setDocumentLocator(const Locator* const)
{
}
inline void HandlerBase::startDocument()
{
}
inline void
HandlerBase::startElement( const XMLCh* const
, AttributeList&)
{
}
inline void HandlerBase::warning(const SAXParseException&)
{
}
XERCES_CPP_NAMESPACE_END
#endif
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