toxmlsaxhandler.java

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/*
 * Copyright 2001-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * $Id: ToXMLSAXHandler.java,v 1.3 2005/09/28 13:49:08 pvedula Exp $
 */
 package com.sun.org.apache.xml.internal.serializer;

import java.io.IOException;
import java.io.OutputStream;
import java.io.Writer;
import java.util.Properties;

import javax.xml.transform.Result;

import org.w3c.dom.Node;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.ext.LexicalHandler;

/**
 * This class receives notification of SAX-like events, and with gathered
 * information over these calls it will invoke the equivalent SAX methods
 * on a handler, the ultimate xsl:output method is known to be "xml".
 * 
 * This class is not a public API, it is only public because it is used by Xalan.
 * @xsl.usage internal
 */
public final class ToXMLSAXHandler extends ToSAXHandler
{

    /**
     * Keeps track of whether output escaping is currently enabled
     */
    protected boolean m_escapeSetting = false;

    public ToXMLSAXHandler()
    {
        // default constructor (need to set content handler ASAP !)
        m_prefixMap = new NamespaceMappings();
        initCDATA();
    }

    /**
     * @see Serializer#getOutputFormat()
     */
    public Properties getOutputFormat()
    {
        return null;
    }

    /**
     * @see Serializer#getOutputStream()
     */
    public OutputStream getOutputStream()
    {
        return null;
    }

    /**
     * @see Serializer#getWriter()
     */
    public Writer getWriter()
    {
        return null;
    }

    /**
     * Do nothing for SAX.
     */
    public void indent(int n) throws SAXException
    {
    }


    /**
     * @see DOMSerializer#serialize(Node)
     */
    public void serialize(Node node) throws IOException
    {
    }

    /**
     * @see SerializationHandler#setEscaping(boolean)
     */
    public boolean setEscaping(boolean escape) throws SAXException
    {
        boolean oldEscapeSetting = m_escapeSetting;
        m_escapeSetting = escape;

        if (escape) {
            processingInstruction(Result.PI_ENABLE_OUTPUT_ESCAPING, "");
        } else {
            processingInstruction(Result.PI_DISABLE_OUTPUT_ESCAPING, "");
        }

        return oldEscapeSetting;
    }

    /**
     * @see Serializer#setOutputFormat(Properties)
     */
    public void setOutputFormat(Properties format)
    {
    }

    /**
     * @see Serializer#setOutputStream(OutputStream)
     */
    public void setOutputStream(OutputStream output)
    {
    }

    /**
     * @see Serializer#setWriter(Writer)
     */
    public void setWriter(Writer writer)
    {
    }

    /**
     * @see org.xml.sax.ext.DeclHandler#attributeDecl(String, String, String, String, String)
     */
    public void attributeDecl(
        String arg0,
        String arg1,
        String arg2,
        String arg3,
        String arg4)
        throws SAXException
    {
    }

    /**
     * @see org.xml.sax.ext.DeclHandler#elementDecl(String, String)
     */
    public void elementDecl(String arg0, String arg1) throws SAXException
    {
    }

    /**
     * @see org.xml.sax.ext.DeclHandler#externalEntityDecl(String, String, String)
     */
    public void externalEntityDecl(String arg0, String arg1, String arg2)
        throws SAXException
    {
    }

    /**
     * @see org.xml.sax.ext.DeclHandler#internalEntityDecl(String, String)
     */
    public void internalEntityDecl(String arg0, String arg1)
        throws SAXException
    {
    }

    /**
     * Receives notification of the end of the document.
     * @see org.xml.sax.ContentHandler#endDocument()
     */
    public void endDocument() throws SAXException
    {

        flushPending();

        // Close output document
        m_saxHandler.endDocument();

        if (m_tracer != null)
            super.fireEndDoc();
    }

    /**
     * This method is called when all the data needed for a call to the
     * SAX handler's startElement() method has been gathered.
     */
    protected void closeStartTag() throws SAXException
    {

        m_elemContext.m_startTagOpen = false;

        final String localName = getLocalName(m_elemContext.m_elementName);
        final String uri = getNamespaceURI(m_elemContext.m_elementName, true);

        // Now is time to send the startElement event
        if (m_needToCallStartDocument)
        {
            startDocumentInternal();
        }
        m_saxHandler.startElement(uri, localName, m_elemContext.m_elementName, m_attributes);
        // we've sent the official SAX attributes on their way,
        // now we don't need them anymore.
        m_attributes.clear();

        if(m_state != null)
          m_state.setCurrentNode(null);
    }

    /**
     * Closes ane open cdata tag, and
     * unlike the this.endCDATA() method (from the LexicalHandler) interface,
     * this "internal" method will send the endCDATA() call to the wrapped
     * handler.
     * 
     */
    public void closeCDATA() throws SAXException
    {

        // Output closing bracket - "]]>"
        if (m_lexHandler != null && m_cdataTagOpen) {
            m_lexHandler.endCDATA();
        }
        

        // There are no longer any calls made to 
        // m_lexHandler.startCDATA() without a balancing call to
        // m_lexHandler.endCDATA()
        // so we set m_cdataTagOpen to false to remember this.
        m_cdataTagOpen = false;        
    }

    /**
     * @see org.xml.sax.ContentHandler#endElement(String, String, String)
     */
    public void endElement(String namespaceURI, String localName, String qName)
        throws SAXException
    {
        // Close any open elements etc.
        flushPending();
        
        if (namespaceURI == null)
        {
            if (m_elemContext.m_elementURI != null)
                namespaceURI = m_elemContext.m_elementURI;
            else
                namespaceURI = getNamespaceURI(qName, true);
        }
        
        if (localName == null)
        {
            if (m_elemContext.m_elementLocalName != null)
                localName = m_elemContext.m_elementLocalName;
            else
                localName = getLocalName(qName);
        }

        m_saxHandler.endElement(namespaceURI, localName, qName);

        if (m_tracer != null)
            super.fireEndElem(qName);       

        /* Pop all namespaces at the current element depth.
         * We are not waiting for official endPrefixMapping() calls.
         */
        m_prefixMap.popNamespaces(m_elemContext.m_currentElemDepth,
            m_saxHandler);
        m_elemContext = m_elemContext.m_prev;
    }

    /**
     * @see org.xml.sax.ContentHandler#endPrefixMapping(String)
     */
    public void endPrefixMapping(String prefix) throws SAXException
    {
        /* poping all prefix mappings should have been done
         * in endElement() already
         */
         return;
    }

    /**
     * @see org.xml.sax.ContentHandler#ignorableWhitespace(char[], int, int)
     */
    public void ignorableWhitespace(char[] arg0, int arg1, int arg2)
        throws SAXException
    {
        m_saxHandler.ignorableWhitespace(arg0,arg1,arg2);
    }

    /**
     * @see org.xml.sax.ContentHandler#setDocumentLocator(Locator)
     */
    public void setDocumentLocator(Locator arg0)
    {
        super.setDocumentLocator(arg0);
        m_saxHandler.setDocumentLocator(arg0);
    }

    /**
     * @see org.xml.sax.ContentHandler#skippedEntity(String)
     */
    public void skippedEntity(String arg0) throws SAXException
    {
        m_saxHandler.skippedEntity(arg0);
    }

    /**
     * @see org.xml.sax.ContentHandler#startPrefixMapping(String, String)
     * @param prefix The prefix that maps to the URI
     * @param uri The URI for the namespace
     */
    public void startPrefixMapping(String prefix, String uri)
        throws SAXException
    {
       startPrefixMapping(prefix, uri, true);
    }

    /**
     * Remember the prefix/uri mapping at the current nested element depth.
     *
     * @see org.xml.sax.ContentHandler#startPrefixMapping(String, String)
     * @param prefix The prefix that maps to the URI
     * @param uri The URI for the namespace
     * @param shouldFlush a flag indicating if the mapping applies to the
     * current element or an up coming child (not used).
     */

    public boolean startPrefixMapping(
        String prefix,
        String uri,
        boolean shouldFlush)
        throws org.xml.sax.SAXException
    {

        /* Remember the mapping, and at what depth it was declared
         * This is one greater than the current depth because these
         * mappings will apply to the next depth. This is in
         * consideration that startElement() will soon be called
         */

        boolean pushed;
        int pushDepth;
        if (shouldFlush)
        {
            flushPending();
            // the prefix mapping applies to the child element (one deeper)
            pushDepth = m_elemContext.m_currentElemDepth + 1;
        }
        else
        {
            // the prefix mapping applies to the current element
            pushDepth = m_elemContext.m_currentElemDepth;
        }
        pushed = m_prefixMap.pushNamespace(prefix, uri, pushDepth);

        if (pushed)
        {
            m_saxHandler.startPrefixMapping(prefix,uri);
            
            if (getShouldOutputNSAttr()) 
            {

	              /* Brian M.: don't know if we really needto do this. The
	               * callers of this object should have injected both
	               * startPrefixMapping and the attributes.  We are
	               * just covering our butt here.
	               */
	              String name;
  	            if (EMPTYSTRING.equals(prefix))
  	            {
  	                name = "xmlns";
  	                addAttributeAlways(XMLNS_URI, name, name,"CDATA",uri, false);
  	            }
  	            else 
                {
  	                if (!EMPTYSTRING.equals(uri)) // hack for XSLTC attribset16 test
  	                {                             // that maps ns1 prefix to "" URI 
  	                    name = "xmlns:" + prefix;
  	
  	                    /* for something like xmlns:abc="w3.pretend.org"
  	             	 	     *  the uri is the value, that is why we pass it in the
  	             	 	     * value, or 5th slot of addAttributeAlways()
  	                 	   */
  	                    addAttributeAlways(XMLNS_URI, prefix, name,"CDATA",uri, false );