369 lines
13 KiB
Java
369 lines
13 KiB
Java
// SAX default handler base class.
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// No warranty; no copyright -- use this as you will.
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// $Id: HandlerBase.java,v 1.1 2000/10/02 02:43:17 sboag Exp $
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package org.xml.sax;
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/**
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* Default base class for handlers.
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*
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* <blockquote>
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* <em>This module, both source code and documentation, is in the
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* Public Domain, and comes with <strong>NO WARRANTY</strong>.</em>
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* </blockquote>
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*
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* <p>This class implements the default behaviour for four SAX1
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* interfaces: EntityResolver, DTDHandler, DocumentHandler,
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* and ErrorHandler. It is now obsolete, but is included in SAX2 to
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* support legacy SAX1 applications. SAX2 applications should use
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* the {@link org.xml.sax.helpers.DefaultHandler DefaultHandler}
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* class instead.</p>
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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>Note that the use of this class is optional.</p>
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*
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* @deprecated This class works with the deprecated
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* {@link org.xml.sax.DocumentHandler DocumentHandler}
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* interface. It has been replaced by the SAX2
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* {@link org.xml.sax.helpers.DefaultHandler DefaultHandler}
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* class.
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* @since SAX 1.0
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* @author David Megginson,
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* <a href="mailto:sax@megginson.com">sax@megginson.com</a>
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* @version 2.0
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* @see org.xml.sax.EntityResolver
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* @see org.xml.sax.DTDHandler
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* @see org.xml.sax.DocumentHandler
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* @see org.xml.sax.ErrorHandler
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*/
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public class HandlerBase
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implements EntityResolver, DTDHandler, DocumentHandler, ErrorHandler
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{
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////////////////////////////////////////////////////////////////////
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// Default implementation of the EntityResolver interface.
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////////////////////////////////////////////////////////////////////
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/**
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* Resolve an external entity.
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*
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* <p>Always return null, so that the parser will use the system
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* identifier provided in the XML document. This method implements
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* the SAX default behaviour: application writers can override it
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* in a subclass to do special translations such as catalog lookups
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* or URI redirection.</p>
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*
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* @param publicId The public identifer, or null 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, or null to require the
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* default behaviour.
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* @exception org.xml.sax.SAXException Any SAX exception, possibly
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* wrapping another exception.
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* @see org.xml.sax.EntityResolver#resolveEntity
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*/
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public InputSource resolveEntity (String publicId, String systemId)
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throws SAXException
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{
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return null;
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}
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////////////////////////////////////////////////////////////////////
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// Default implementation of DTDHandler interface.
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////////////////////////////////////////////////////////////////////
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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 null if not
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* available.
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* @param systemId The notation system identifier.
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* @see org.xml.sax.DTDHandler#notationDecl
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*/
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public void notationDecl (String name, String publicId, String systemId)
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{
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// no op
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}
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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 null 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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* @see org.xml.sax.DTDHandler#unparsedEntityDecl
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*/
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public void unparsedEntityDecl (String name, String publicId,
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String systemId, String notationName)
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{
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// no op
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}
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////////////////////////////////////////////////////////////////////
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// Default implementation of DocumentHandler interface.
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////////////////////////////////////////////////////////////////////
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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 org.xml.sax.DocumentHandler#setDocumentLocator
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* @see org.xml.sax.Locator
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*/
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public void setDocumentLocator (Locator locator)
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{
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// no op
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}
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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 org.xml.sax.SAXException Any SAX exception, possibly
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* wrapping another exception.
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* @see org.xml.sax.DocumentHandler#startDocument
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*/
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public void startDocument ()
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throws SAXException
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{
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// no op
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}
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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 beginning
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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 org.xml.sax.SAXException Any SAX exception, possibly
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* wrapping another exception.
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* @see org.xml.sax.DocumentHandler#endDocument
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*/
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public void endDocument ()
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throws SAXException
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{
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// no op
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}
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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 name The element type name.
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* @param attributes The specified or defaulted attributes.
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* @exception org.xml.sax.SAXException Any SAX exception, possibly
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* wrapping another exception.
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* @see org.xml.sax.DocumentHandler#startElement
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*/
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public void startElement (String name, AttributeList attributes)
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throws SAXException
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{
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// no op
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}
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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 name The element type name.
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* @param attributes The specified or defaulted attributes.
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* @exception org.xml.sax.SAXException Any SAX exception, possibly
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* wrapping another exception.
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* @see org.xml.sax.DocumentHandler#endElement
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*/
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public void endElement (String name)
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throws SAXException
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{
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// no op
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}
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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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* @param start The start position in the character array.
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* @param length The number of characters to use from the
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* character array.
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* @exception org.xml.sax.SAXException Any SAX exception, possibly
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* wrapping another exception.
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* @see org.xml.sax.DocumentHandler#characters
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*/
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public void characters (char ch[], int start, int length)
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throws SAXException
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{
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// no op
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}
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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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* @param start The start position in the character array.
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* @param length The number of characters to use from the
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* character array.
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* @exception org.xml.sax.SAXException Any SAX exception, possibly
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* wrapping another exception.
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* @see org.xml.sax.DocumentHandler#ignorableWhitespace
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*/
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public void ignorableWhitespace (char ch[], int start, int length)
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throws SAXException
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{
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// no op
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}
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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 null if
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* none is supplied.
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* @exception org.xml.sax.SAXException Any SAX exception, possibly
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* wrapping another exception.
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* @see org.xml.sax.DocumentHandler#processingInstruction
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*/
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public void processingInstruction (String target, String data)
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throws SAXException
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{
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// no op
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}
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////////////////////////////////////////////////////////////////////
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// Default implementation of the ErrorHandler interface.
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////////////////////////////////////////////////////////////////////
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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 org.xml.sax.SAXException Any SAX exception, possibly
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* wrapping another exception.
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* @see org.xml.sax.ErrorHandler#warning
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* @see org.xml.sax.SAXParseException
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*/
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public void warning (SAXParseException e)
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throws SAXException
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{
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// no op
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}
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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 org.xml.sax.SAXException Any SAX exception, possibly
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* wrapping another exception.
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* @see org.xml.sax.ErrorHandler#warning
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* @see org.xml.sax.SAXParseException
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*/
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public void error (SAXParseException e)
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throws SAXException
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{
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// no op
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}
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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 org.xml.sax.SAXException Any SAX exception, possibly
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* wrapping another exception.
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* @see org.xml.sax.ErrorHandler#fatalError
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* @see org.xml.sax.SAXParseException
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*/
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public void fatalError (SAXParseException e)
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throws SAXException
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{
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throw e;
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}
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}
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// end of HandlerBase.java
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