| // 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,v 1.11 2004/12/11 15:41:10 dog Exp $ |
| |
| 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. |
| * |
| * <blockquote> |
| * <em>This module, both source code and documentation, is in the |
| * Public Domain, and comes with <strong>NO WARRANTY</strong>.</em> |
| * See <a href='http://www.saxproject.org'>http://www.saxproject.org</a> |
| * for further information. |
| * </blockquote> |
| * |
| * <p>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:</p> |
| * |
| * <ul> |
| * <li>{@link org.xml.sax.EntityResolver EntityResolver}</li> |
| * <li>{@link org.xml.sax.DTDHandler DTDHandler}</li> |
| * <li>{@link org.xml.sax.ContentHandler ContentHandler}</li> |
| * <li>{@link org.xml.sax.ErrorHandler ErrorHandler}</li> |
| * </ul> |
| * |
| * <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>This class replaces the deprecated SAX1 |
| * {@link org.xml.sax.HandlerBase HandlerBase} class.</p> |
| * |
| * @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. |
| * |
| * <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. |
| * @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. |
| * |
| * <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. |
| * @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. |
| * |
| * <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. |
| * @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. |
| * |
| * <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 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. |
| * |
| * <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 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. |
| * |
| * <p>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).</p> |
| * |
| * @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. |
| * |
| * <p>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).</p> |
| * |
| * @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. |
| * |
| * <p>By default, do nothing. Application writers may override this |
| * method in a subclass to take specific actions at the end of |
| * each prefix mapping.</p> |
| * |
| * @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. |
| * |
| * <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 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. |
| * |
| * <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 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. |
| * |
| * <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 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. |
| * |
| * <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 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. |
| * |
| * <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 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. |
| * |
| * <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 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. |
| * |
| * <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 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. |
| * |
| * <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 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. |
| * |
| * <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 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 |
