public TransformerHandlerImpl(TransformerImpl transformer) 
{
                  
        // Save the reference to the transformer
        _transformer = transformer;
        if (transformer.isIdentity()) {
            // Set initial handler to the empty handler
            _handler = new DefaultHandler();
            _isIdentity = true;
        }
        else {
            // Get a reference to the translet wrapped inside the transformer
            _translet = _transformer.getTranslet();
        }
}

Cosntructor - pass in reference to a TransformerImpl object

 public  void attributeDecl(String eName,
    String aName,
    String type,
    String valueDefault,
    String value) throws SAXException 
{
        if (_declHandler != null) {
            _declHandler.attributeDecl(eName, aName, type, valueDefault, value);
        }
}

Implements org.xml.sax.ext.DeclHandler.attributeDecl()

 public  void characters(char[] ch,
    int start,
    int length) throws SAXException 
{
        _handler.characters(ch, start, length);
}

Implements org.xml.sax.ContentHandler.characters() Receive notification of character data.

 public  void comment(char[] ch,
    int start,
    int length) throws SAXException 
{
        if (_lexHandler != null) {
            _lexHandler.comment(ch, start, length);
        }
}

Implements org.xml.sax.ext.LexicalHandler.comment() Receieve notification of a comment

 public  void elementDecl(String name,
    String model) throws SAXException 
{
        if (_declHandler != null) {
            _declHandler.elementDecl(name, model);
        }
}

Implements org.xml.sax.ext.DeclHandler.elementDecl()

 public  void endCDATA() throws SAXException 
{
        if (_lexHandler != null) {
            _lexHandler.endCDATA();
        }
}

Implements org.xml.sax.ext.LexicalHandler.endCDATA()

 public  void endDTD() throws SAXException 
{
        if (_lexHandler != null) {
            _lexHandler.endDTD();
        }
}

Implements org.xml.sax.ext.LexicalHandler.endDTD()

 public  void endDocument() throws SAXException 
{
        // Signal to the DOMBuilder that the document is complete
        _handler.endDocument();
        if (!_isIdentity) {
            // Run the transformation now if we have a reference to a Result object
            if (_result != null) {
                try {
                    _transformer.setDOM(_dom);
                    _transformer.transform(null, _result);
                }
                catch (TransformerException e) {
                    throw new SAXException(e);
                }
            }
            // Signal that the internal DOM is built (see 'setResult()').
            _done = true;
            // Set this DOM as the transformer's DOM
            _transformer.setDOM(_dom);
        }
        if (_isIdentity && _result instanceof DOMResult) {
            ((DOMResult)_result).setNode(_transformer.getTransletOutputHandlerFactory().getNode());
        }
}

Implements org.xml.sax.ContentHandler.endDocument() Receive notification of the end of a document.

 public  void endElement(String namespaceURI,
    String localName,
    String qname) throws SAXException 
{
        _handler.endElement(namespaceURI, localName, qname);
}

Implements org.xml.sax.ContentHandler.endElement() Receive notification of the end of an element.

 public  void endEntity(String name) throws SAXException 
{
        if (_lexHandler != null) {
            _lexHandler.endEntity(name);
        }
}

Implements org.xml.sax.ext.LexicalHandler.endEntity()

 public  void endPrefixMapping(String prefix) throws SAXException 
{
        _handler.endPrefixMapping(prefix);
}

Implements org.xml.sax.ContentHandler.endPrefixMapping() End the scope of a prefix-URI Namespace mapping.

 public  void externalEntityDecl(String name,
    String publicId,
    String systemId) throws SAXException 
{
        if (_declHandler != null) {
            _declHandler.externalEntityDecl(name, publicId, systemId);
        }
}

Implements org.xml.sax.ext.DeclHandler.externalEntityDecl()

 public String getSystemId() 
{
        return _systemId;
}

Implements javax.xml.transform.sax.TransformerHandler.getSystemId() Get the base ID (URI or system ID) from where relative URLs will be resolved.

 public Transformer getTransformer() 
{
        return _transformer;
}

Implements javax.xml.transform.sax.TransformerHandler.getTransformer() Get the Transformer associated with this handler, which is needed in order to set parameters and output properties.

 public  void ignorableWhitespace(char[] ch,
    int start,
    int length) throws SAXException 
{
        _handler.ignorableWhitespace(ch, start, length);
}

Implements org.xml.sax.ContentHandler.ignorableWhitespace() Receive notification of ignorable whitespace in element content. Similar to characters(char[], int, int).

 public  void internalEntityDecl(String name,
    String value) throws SAXException 
{
        if (_declHandler != null) {
            _declHandler.internalEntityDecl(name, value);
        }
}

Implements org.xml.sax.ext.DeclHandler.externalEntityDecl()

 public  void notationDecl(String name,
    String publicId,
    String systemId) throws SAXException 
{
        if (_dtdHandler != null) {
            _dtdHandler.notationDecl(name, publicId, systemId);
        }
}

Implements org.xml.sax.DTDHandler.notationDecl()

 public  void processingInstruction(String target,
    String data) throws SAXException 
{
        _handler.processingInstruction(target, data);
}

Implements org.xml.sax.ContentHandler.processingInstruction() Receive notification of a processing instruction.

 public  void reset() 
{
       _systemId = null;
       _dom = null;
       _handler = null;
       _lexHandler = null;
       _dtdHandler = null;
       _declHandler = null;
       _result = null;
       _locator = null;
}

Implementation of the reset() method

 public  void setDocumentLocator(Locator locator) 
{
        _locator = locator;
        if (_handler != null) {
            _handler.setDocumentLocator(locator);
        }
}

Implements org.xml.sax.ContentHandler.setDocumentLocator() Receive an object for locating the origin of SAX document events.

 public  void setResult(Result result) throws IllegalArgumentException 
{
        _result = result;
    if (null == result) {
       ErrorMsg err = new ErrorMsg(ErrorMsg.ER_RESULT_NULL);
       throw new IllegalArgumentException(err.toString()); //"result should not be null");
    }
        if (_isIdentity) {
            try {
                // Connect this object with output system directly
                SerializationHandler outputHandler =
                    _transformer.getOutputHandler(result);
                _transformer.transferOutputProperties(outputHandler);
                _handler = outputHandler;
                _lexHandler = outputHandler;
            }
            catch (TransformerException e) {
                _result = null;
            }
        }
        else if (_done) {
            // Run the transformation now, if not already done
            try {
                _transformer.setDOM(_dom);
                _transformer.transform(null, _result);
            }
            catch (TransformerException e) {
                // What the hell are we supposed to do with this???
                throw new IllegalArgumentException(e.getMessage());
            }
        }
}

Implements javax.xml.transform.sax.TransformerHandler.setResult() Enables the user of the TransformerHandler to set the to set the Result for the transformation.

 public  void setSystemId(String id) 
{
        _systemId = id;
}

Implements javax.xml.transform.sax.TransformerHandler.setSystemId() Get the base ID (URI or system ID) from where relative URLs will be resolved.

 public  void skippedEntity(String name) throws SAXException 
{
        _handler.skippedEntity(name);
}

Implements org.xml.sax.ContentHandler.skippedEntity() Receive notification of a skipped entity.

 public  void startCDATA() throws SAXException 
{
        if (_lexHandler != null) {
            _lexHandler.startCDATA();
        }
}

Implements org.xml.sax.ext.LexicalHandler.startCDATA()

 public  void startDTD(String name,
    String publicId,
    String systemId) throws SAXException 
{
        if (_lexHandler != null) {
            _lexHandler.startDTD(name, publicId, systemId);
        }
}

Implements org.xml.sax.ext.LexicalHandler.startDTD()

 public  void startDocument() throws SAXException 
{
        // Make sure setResult() was called before the first SAX event
        if (_result == null) {
            ErrorMsg err = new ErrorMsg(ErrorMsg.JAXP_SET_RESULT_ERR);
            throw new SAXException(err.toString());
        }
        if (!_isIdentity) {
            boolean hasIdCall = (_translet != null) ? _translet.hasIdCall() : false;
            XSLTCDTMManager dtmManager = null;
            // Create an internal DOM (not W3C) and get SAX2 input handler
            try {
                dtmManager =
                    (XSLTCDTMManager)_transformer.getTransformerFactory()
                                                 .getDTMManagerClass()
                                                 .newInstance();
            } catch (Exception e) {
                throw new SAXException(e);
            }
            DTMWSFilter wsFilter;
            if (_translet != null && _translet instanceof StripFilter) {
                wsFilter = new DOMWSFilter(_translet);
            } else {
                wsFilter = null;
            }
            // Construct the DTM using the SAX events that come through
            _dom = (SAXImpl)dtmManager.getDTM(null, false, wsFilter, true,
                                              false, hasIdCall);
            _handler = _dom.getBuilder();
            _lexHandler = (LexicalHandler) _handler;
            _dtdHandler = (DTDHandler) _handler;
            _declHandler = (DeclHandler) _handler;
            // Set document URI
            _dom.setDocumentURI(_systemId);
            if (_locator != null) {
                _handler.setDocumentLocator(_locator);
            }
        }
        // Proxy call
        _handler.startDocument();
}

Implements org.xml.sax.ContentHandler.startDocument() Receive notification of the beginning of a document.

 public  void startElement(String uri,
    String localName,
    String qname,
    Attributes attributes) throws SAXException 
{
        _handler.startElement(uri, localName, qname, attributes);
}

Implements org.xml.sax.ContentHandler.startElement() Receive notification of the beginning of an element.

 public  void startEntity(String name) throws SAXException 
{
        if (_lexHandler != null) {
            _lexHandler.startEntity(name);
        }
}

Implements org.xml.sax.ext.LexicalHandler.startEntity()

 public  void startPrefixMapping(String prefix,
    String uri) throws SAXException 
{
        _handler.startPrefixMapping(prefix, uri);
}

Implements org.xml.sax.ContentHandler.startPrefixMapping() Begin the scope of a prefix-URI Namespace mapping.

 public  void unparsedEntityDecl(String name,
    String publicId,
    String systemId,
    String notationName) throws SAXException 
{
        if (_dtdHandler != null) {
            _dtdHandler.unparsedEntityDecl(name, publicId, systemId,
                                           notationName);
        }
}

Implements org.xml.sax.DTDHandler.unparsedEntityDecl()