/*

 * 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