org.xml.sax.helpers.DefaultHandler Maven / Gradle / Ivy
// DefaultHandler.java - default implementation of the core handlers.
// http://www.saxproject.org
// Written by David Megginson
// NO WARRANTY! This class is in the public domain.
// $Id: DefaultHandler.java 226184 2005-04-08 10:53:24Z neeraj $
package org.xml.sax.helpers;
import java.io.IOException;
import org.xml.sax.InputSource;
import org.xml.sax.Locator;
import org.xml.sax.Attributes;
import org.xml.sax.EntityResolver;
import org.xml.sax.DTDHandler;
import org.xml.sax.ContentHandler;
import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
/**
* Default base class for SAX2 event handlers.
*
*
* This module, both source code and documentation, is in the
* Public Domain, and comes with NO WARRANTY.
* See http://www.saxproject.org
* for further information.
*
*
* This class is available as a convenience base class for SAX2
* applications: it provides default implementations for all of the
* callbacks in the four core SAX2 handler classes:
*
*
* - {@link org.xml.sax.EntityResolver EntityResolver}
* - {@link org.xml.sax.DTDHandler DTDHandler}
* - {@link org.xml.sax.ContentHandler ContentHandler}
* - {@link org.xml.sax.ErrorHandler ErrorHandler}
*
*
* 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.
*
* This class replaces the deprecated SAX1
* {@link org.xml.sax.HandlerBase HandlerBase} class.
*
* @since SAX 2.0
* @author David Megginson,
* @version 2.0.1 (sax2r2)
* @see org.xml.sax.EntityResolver
* @see org.xml.sax.DTDHandler
* @see org.xml.sax.ContentHandler
* @see org.xml.sax.ErrorHandler
*/
public class DefaultHandler
implements EntityResolver, DTDHandler, ContentHandler, ErrorHandler
{
////////////////////////////////////////////////////////////////////
// Default implementation of the EntityResolver interface.
////////////////////////////////////////////////////////////////////
/**
* Resolve an external entity.
*
* 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.
*
* @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.
* @exception java.io.IOException If there is an error setting
* up the new input source.
* @exception org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
* @see org.xml.sax.EntityResolver#resolveEntity
*/
public InputSource resolveEntity (String publicId, String systemId)
throws IOException, SAXException
{
return null;
}
////////////////////////////////////////////////////////////////////
// Default implementation of DTDHandler interface.
////////////////////////////////////////////////////////////////////
/**
* Receive notification of a notation declaration.
*
* 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.
*
* @param name The notation name.
* @param publicId The notation public identifier, or null if not
* available.
* @param systemId The notation system identifier.
* @exception org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
* @see org.xml.sax.DTDHandler#notationDecl
*/
public void notationDecl (String name, String publicId, String systemId)
throws SAXException
{
// no op
}
/**
* Receive notification of an unparsed entity declaration.
*
* By default, do nothing. Application writers may override this
* method in a subclass to keep track of the unparsed entities
* declared in a document.
*
* @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.
* @exception org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
* @see org.xml.sax.DTDHandler#unparsedEntityDecl
*/
public void unparsedEntityDecl (String name, String publicId,
String systemId, String notationName)
throws SAXException
{
// no op
}
////////////////////////////////////////////////////////////////////
// Default implementation of ContentHandler interface.
////////////////////////////////////////////////////////////////////
/**
* Receive a Locator object for document events.
*
* 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.
*
* @param locator A locator for all SAX document events.
* @see org.xml.sax.ContentHandler#setDocumentLocator
* @see org.xml.sax.Locator
*/
public void setDocumentLocator (Locator locator)
{
// no op
}
/**
* Receive notification of the beginning of the document.
*
* 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).
*
* @exception org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
* @see org.xml.sax.ContentHandler#startDocument
*/
public void startDocument ()
throws SAXException
{
// no op
}
/**
* Receive notification of the end of the document.
*
* By default, do nothing. Application writers may override this
* method in a subclass to take specific actions at the end
* of a document (such as finalising a tree or closing an output
* file).
*
* @exception org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
* @see org.xml.sax.ContentHandler#endDocument
*/
public void endDocument ()
throws SAXException
{
// no op
}
/**
* Receive notification of the start of a Namespace mapping.
*
* By default, do nothing. Application writers may override this
* method in a subclass to take specific actions at the start of
* each Namespace prefix scope (such as storing the prefix mapping).
*
* @param prefix The Namespace prefix being declared.
* @param uri The Namespace URI mapped to the prefix.
* @exception org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
* @see org.xml.sax.ContentHandler#startPrefixMapping
*/
public void startPrefixMapping (String prefix, String uri)
throws SAXException
{
// no op
}
/**
* Receive notification of the end of a Namespace mapping.
*
* By default, do nothing. Application writers may override this
* method in a subclass to take specific actions at the end of
* each prefix mapping.
*
* @param prefix The Namespace prefix being declared.
* @exception org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
* @see org.xml.sax.ContentHandler#endPrefixMapping
*/
public void endPrefixMapping (String prefix)
throws SAXException
{
// no op
}
/**
* Receive notification of the start of an element.
*
* 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).
*
* @param uri The Namespace URI, or the empty string if the
* element has no Namespace URI or if Namespace
* processing is not being performed.
* @param localName The local name (without prefix), or the
* empty string if Namespace processing is not being
* performed.
* @param qName The qualified name (with prefix), or the
* empty string if qualified names are not available.
* @param attributes The attributes attached to the element. If
* there are no attributes, it shall be an empty
* Attributes object.
* @exception org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
* @see org.xml.sax.ContentHandler#startElement
*/
public void startElement (String uri, String localName,
String qName, Attributes attributes)
throws SAXException
{
// no op
}
/**
* Receive notification of the end of an element.
*
* 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).
*
* @param uri The Namespace URI, or the empty string if the
* element has no Namespace URI or if Namespace
* processing is not being performed.
* @param localName The local name (without prefix), or the
* empty string if Namespace processing is not being
* performed.
* @param qName The qualified name (with prefix), or the
* empty string if qualified names are not available.
* @exception org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
* @see org.xml.sax.ContentHandler#endElement
*/
public void endElement (String uri, String localName, String qName)
throws SAXException
{
// no op
}
/**
* Receive notification of character data inside an element.
*
* 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).
*
* @param ch The characters.
* @param start The start position in the character array.
* @param length The number of characters to use from the
* character array.
* @exception org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
* @see org.xml.sax.ContentHandler#characters
*/
public void characters (char ch[], int start, int length)
throws SAXException
{
// no op
}
/**
* Receive notification of ignorable whitespace in element content.
*
* 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).
*
* @param ch The whitespace characters.
* @param start The start position in the character array.
* @param length The number of characters to use from the
* character array.
* @exception org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
* @see org.xml.sax.ContentHandler#ignorableWhitespace
*/
public void ignorableWhitespace (char ch[], int start, int length)
throws SAXException
{
// no op
}
/**
* Receive notification of a processing instruction.
*
* 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.
*
* @param target The processing instruction target.
* @param data The processing instruction data, or null if
* none is supplied.
* @exception org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
* @see org.xml.sax.ContentHandler#processingInstruction
*/
public void processingInstruction (String target, String data)
throws SAXException
{
// no op
}
/**
* Receive notification of a skipped entity.
*
* 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.
*
* @param name The name of the skipped entity.
* @exception org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
* @see org.xml.sax.ContentHandler#processingInstruction
*/
public void skippedEntity (String name)
throws SAXException
{
// no op
}
////////////////////////////////////////////////////////////////////
// Default implementation of the ErrorHandler interface.
////////////////////////////////////////////////////////////////////
/**
* Receive notification of a parser warning.
*
* 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.
*
* @param e The warning information encoded as an exception.
* @exception org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
* @see org.xml.sax.ErrorHandler#warning
* @see org.xml.sax.SAXParseException
*/
public void warning (SAXParseException e)
throws SAXException
{
// no op
}
/**
* Receive notification of a recoverable parser error.
*
* 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.
*
* @param e The warning information encoded as an exception.
* @exception org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
* @see org.xml.sax.ErrorHandler#warning
* @see org.xml.sax.SAXParseException
*/
public void error (SAXParseException e)
throws SAXException
{
// no op
}
/**
* Report a fatal XML parsing error.
*
* 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.
*
* @param e The error information encoded as an exception.
* @exception org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
* @see org.xml.sax.ErrorHandler#fatalError
* @see org.xml.sax.SAXParseException
*/
public void fatalError (SAXParseException e)
throws SAXException
{
throw e;
}
}
// end of DefaultHandler.java