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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.
  */
 
  /*
  * $Id$
  */
 
 #if !defined(XERCESC_INCLUDE_GUARD_XMLDOCUMENTHANDLER_HPP)
 #define XERCESC_INCLUDE_GUARD_XMLDOCUMENTHANDLER_HPP
 
 #include <xercesc/util/XercesDefs.hpp>
 #include <xercesc/util/RefVectorOf.hpp>
 #include <xercesc/framework/XMLAttr.hpp>
 
 XERCES_CPP_NAMESPACE_BEGIN
 
 class XMLElementDecl;
 class XMLEntityDecl;
 
 /**
   * This abstract class provides the interface for the scanner to return
   * XML document information up to the parser as it scans through the
   * document.
   *
   * The interface is very similar to org.sax.DocumentHandler, but
   * has some extra methods required to get all the data out.
   */
 class XMLPARSER_EXPORT XMLDocumentHandler
 {
 public:
     // -----------------------------------------------------------------------
     //  Constructors are hidden, just the virtual destructor is exposed
     // -----------------------------------------------------------------------
     /** @name Destructor */
     //@{
     virtual ~XMLDocumentHandler()
     {
     }
     //@}
 
     /** @name The document handler interface */
     //@{
     /** Receive notification of character data.
       *
       * <p>The scanner will call this method to report each chunk of
       * character data. The scanner may return all contiguous character
       * data in a single chunk, or they may split it into several
       * chunks; however, all of the characters in any single event
       * will come from the same external entity, so that the Locator
       * provides useful information.</p>
       *
       * <p>The parser must not attempt to read from the array
       * outside of the specified range.</p>
       *
       * @param  chars           The content (characters) between markup from the XML
       *                         document.
       * @param  length          The number of characters to read from the array.
       * @param  cdataSection    Indicates that this data is inside a CDATA
       *                         section.
       * @see #ignorableWhitespace
       * @see Locator
       */
     virtual void docCharacters
     (
         const   XMLCh* const    chars
         , const XMLSize_t       length
         , const bool            cdataSection
     ) = 0;
 
     /** Receive notification of comments in the XML content being parsed.
       *
       * This scanner will call this method for any comments found in the
       * content of the document.
       *
       * @param comment The text of the comment.
       */
     virtual void docComment
     (
         const   XMLCh* const    comment
     ) = 0;
 
     /** Receive notification of PI's parsed in the XML content.
       *
       * The scanner will call this method for any PIs it finds within the
       * content of the document.
       *
       * @param  target  The name of the PI.
       * @param  data    The body of the PI. This may be an empty string since
       *                 the body is optional.
       */
     virtual void docPI
     (
         const   XMLCh* const    target
         , const XMLCh* const    data
     ) = 0;
 
     /** Receive notification after the scanner has parsed the end of the
       * document.
       *
       * The scanner will call this method when the current document has been
       * fully parsed. The handler may use this opportunity to do something with
       * the data, clean up temporary data, etc...
       */
     virtual void endDocument() = 0;
 
     /** Receive notification of the end of an element.
       *
       * This method is called when scanner encounters the end of element tag.
       * There will be a corresponding startElement() event for every
       * endElement() event, but not necessarily the other way around. For
       * empty tags, there is only a startElement() call.
       *
       * @param  elemDecl The name of the element whose end tag was just
       *                     parsed.
       * @param  uriId       The ID of the URI in the URI pool (only valid if
       *                     name spaces is enabled)
       * @param  isRoot      Indicates if this is the root element.
       * @param  prefixName  The string representing the prefix name
       */
     virtual void endElement
     (
         const   XMLElementDecl& elemDecl
         , const unsigned int    uriId
         , const bool            isRoot
         , const XMLCh* const    prefixName = 0
     ) = 0;
 
     /** Receive notification when a referenced entity's content ends
       *
       * This method is called when scanner encounters the end of an entity
       * reference.
       *
       * @param  entDecl  The name of the entity reference just scanned.
       */
     virtual void endEntityReference
     (
         const   XMLEntityDecl&  entDecl
     ) = 0;
 
     /** Receive notification of ignorable whitespace in element content.
       *
       * <p>Validating Parsers must use this method to report each chunk
       * of ignorable whitespace (see the W3C XML 1.0 recommendation,
       * section 2.10): non-validating parsers may also use this method
       * if they are capable of parsing and using content models.</p>
       *
       * <p>The scanner may return all contiguous whitespace in a single
       * chunk, or it may split it into several chunks; however, all of
       * the characters in any single event will come from the same
       * external entity, so that the Locator provides useful
       * information.</p>
       *
       * <p>The parser must not attempt to read from the array
       * outside of the specified range.</p>
       *
       * @param  chars       The whitespace characters from the XML document.
       * @param  length      The number of characters to read from the array.
       * @param  cdataSection Indicates that this data is inside a CDATA
       *                     section.
       * @see #docCharacters
       */
     virtual void ignorableWhitespace
     (
         const   XMLCh* const    chars
         , const XMLSize_t       length
         , const bool            cdataSection
     ) = 0;
 
     /** Reset the document handler's state, if required
       *
       * This method is used to give the registered document handler a
       * chance to reset itself. Its called by the scanner at the start of
       * every parse.
       */
     virtual void resetDocument() = 0;
 
     /** Receive notification of the start of a new document
       *
       * This method is the first callback called the scanner at the
       * start of every parse. This is before any content is parsed.
       */
     virtual void startDocument() = 0;
 
     /** Receive notification of a new start tag
       *
       * This method is called when scanner encounters the start of an element tag.
       * All elements must always have a startElement() tag. Empty tags will
       * only have the startElement() tag and no endElement() tag.
       *
       * @param  elemDecl The name of the element whose start tag was just
       *                     parsed.
       * @param  uriId       The ID of the URI in the URI pool (only valid if
       *                     name spaces is enabled)
       * @param  prefixName  The string representing the prefix name
       * @param  attrList    List of attributes in the element
       * @param  attrCount   Count of the attributes in the element
       * @param  isEmpty     Indicates if the element is empty, in which case
       *                     you should not expect an endElement() event.
       * @param  isRoot      Indicates if this is the root element.
       */
     virtual void startElement
     (
         const   XMLElementDecl&         elemDecl
         , const unsigned int            uriId
         , const XMLCh* const            prefixName
         , const RefVectorOf<XMLAttr>&   attrList
         , const XMLSize_t               attrCount
         , const bool                    isEmpty
         , const bool                    isRoot
     ) = 0;
 
     /** Receive notification when the scanner hits an entity reference.
       *
       * This is currently useful only to DOM parser configurations as SAX
       * does not provide any api to return this information.
       *
       * @param  entDecl  The name of the entity that was referenced.
       */
     virtual void startEntityReference(const XMLEntityDecl& entDecl) = 0;
 
     /** Receive notification of an XML declaration
       *
       * Currently neither DOM nor SAX provide API's to return back this
       * information.
       *
       * @param  versionStr      The value of the <code>version</code> pseudoattribute
       *                         of the XML decl.
       * @param  encodingStr     The value of the <code>encoding</code> pseudoattribute
       *                         of the XML decl.
       * @param  standaloneStr   The value of the <code>standalone</code>
       *                         pseudoattribute of the XML decl.
       * @param  autoEncodingStr The encoding string auto-detected by the
       *                         scanner. In absence of any 'encoding' attribute in the
       *                         XML decl, the XML standard specifies how a parser can
       *                         auto-detect. If there is no <code>encodingStr</code>
       *                         this is what will be used to try to decode the file.
       */
     virtual void XMLDecl
     (
         const   XMLCh* const    versionStr
         , const XMLCh* const    encodingStr
         , const XMLCh* const    standaloneStr
         , const XMLCh* const    autoEncodingStr
     ) = 0;
 
     //@}
 
 
 
 protected :
     // -----------------------------------------------------------------------
     //  Hidden Constructors
     // -----------------------------------------------------------------------
     XMLDocumentHandler()
     {
     }
 
 
 private:
     // -----------------------------------------------------------------------
     //  Unimplemented constructors and operators
     // -----------------------------------------------------------------------
     XMLDocumentHandler(const XMLDocumentHandler&);
     XMLDocumentHandler& operator=(const XMLDocumentHandler&);
 };
 
 XERCES_CPP_NAMESPACE_END
 
 #endif

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