libjava/external/sax/org/xml/sax/ext/DefaultHandler2.java

   1 // DefaultHandler2.java - extended DefaultHandler
   2 // http://www.saxproject.org
   3 // Public Domain: no warranty.
   4 // $Id: DefaultHandler2.java,v 1.1 2005/02/02 00:41:52 tromey Exp $
   5
   6 package org.xml.sax.ext;
   7
   8 import java.io.IOException;
   9 import org.xml.sax.InputSource;
  10 import org.xml.sax.SAXException;
  11 import org.xml.sax.helpers.DefaultHandler;
  12
  13
  14 /**
  15  * This class extends the SAX2 base handler class to support the
  16  * SAX2 {@link LexicalHandler}, {@link DeclHandler}, and
  17  * {@link EntityResolver2} extensions.  Except for overriding the
  18  * original SAX1 {@link DefaultHandler#resolveEntity resolveEntity()}
  19  * method the added handler methods just return.  Subclassers may
  20  * override everything on a method-by-method basis.
  21  *
  22  * <blockquote>
  23  * <em>This module, both source code and documentation, is in the
  24  * Public Domain, and comes with <strong>NO WARRANTY</strong>.</em>
  25  * </blockquote>
  26  *
  27  * <p> <em>Note:</em> this class might yet learn that the
  28  * <em>ContentHandler.setDocumentLocator()</em> call might be passed a
  29  * {@link Locator2} object, and that the
  30  * <em>ContentHandler.startElement()</em> call might be passed a
  31  * {@link Attributes2} object.
  32  *
  33  * @since SAX 2.0 (extensions 1.1 alpha)
  34  * @author David Brownell
  35  * @version TBS
  36  */
  37 public class DefaultHandler2 extends DefaultHandler
  38     implements LexicalHandler, DeclHandler, EntityResolver2
  39 {
  40     /** Constructs a handler which ignores all parsing events. */
  41     public DefaultHandler2 () { }
  42
  43
  44     // SAX2 ext-1.0 LexicalHandler
  45
  46     public void startCDATA ()
  47     throws SAXException
  48         {}
  49
  50     public void endCDATA ()
  51     throws SAXException
  52         {}
  53
  54     public void startDTD (String name, String publicId, String systemId)
  55     throws SAXException
  56         {}
  57
  58     public void endDTD ()
  59     throws SAXException
  60         {}
  61
  62     public void startEntity (String name)
  63     throws SAXException
  64         {}
  65
  66     public void endEntity (String name)
  67     throws SAXException
  68         {}
  69
  70     public void comment (char ch [], int start, int length)
  71     throws SAXException
  72         { }
  73
  74
  75     // SAX2 ext-1.0 DeclHandler
  76
  77     public void attributeDecl (String eName, String aName,
  78             String type, String mode, String value)
  79     throws SAXException
  80         {}
  81
  82     public void elementDecl (String name, String model)
  83     throws SAXException
  84         {}
  85
  86     public void externalEntityDecl (String name,
  87         String publicId, String systemId)
  88     throws SAXException
  89         {}
  90
  91     public void internalEntityDecl (String name, String value)
  92     throws SAXException
  93         {}
  94
  95     // SAX2 ext-1.1 EntityResolver2
  96
  97     /**
  98      * Tells the parser that if no external subset has been declared
  99      * in the document text, none should be used.
 100      */
 101     public InputSource getExternalSubset (String name, String baseURI)
 102     throws SAXException, IOException
 103         { return null; }
 104
 105     /**
 106      * Tells the parser to resolve the systemId against the baseURI
 107      * and read the entity text from that resulting absolute URI.
 108      * Note that because the older
 109      * {@link DefaultHandler#resolveEntity DefaultHandler.resolveEntity()},
 110      * method is overridden to call this one, this method may sometimes
 111      * be invoked with null <em>name</em> and <em>baseURI</em>, and
 112      * with the <em>systemId</em> already absolutized.
 113      */
 114     public InputSource resolveEntity (String name, String publicId,
 115             String baseURI, String systemId)
 116     throws SAXException, IOException
 117         { return null; }
 118
 119     // SAX1 EntityResolver
 120
 121     /**
 122      * Invokes
 123      * {@link EntityResolver2#resolveEntity EntityResolver2.resolveEntity()}
 124      * with null entity name and base URI.
 125      * You only need to override that method to use this class.
 126      */
 127     public InputSource resolveEntity (String publicId, String systemId)
 128     throws SAXException, IOException
 129         { return resolveEntity (null, publicId, null, systemId); }
 130 }