tounknownstream.java

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    /**
     * Pass the call on to the underlying handler
     * @see org.xml.sax.ContentHandler#skippedEntity(String)
     */
    public void skippedEntity(String name) throws SAXException
    {
        m_handler.skippedEntity(name);
    }



    /**
     * Pass the call on to the underlying handler
     * @see org.xml.sax.ext.LexicalHandler#comment(char[], int, int)
     */
    public void comment(char[] ch, int start, int length) throws SAXException
    {
        if (m_firstTagNotEmitted)
        {
            flush();
        }

        m_handler.comment(ch, start, length);
    }

    /**
     * Pass the call on to the underlying handler
     * @see org.xml.sax.ext.LexicalHandler#endCDATA()
     */
    public void endCDATA() throws SAXException
    {

        m_handler.endCDATA();
    }

    /**
     * Pass the call on to the underlying handler
     * @see org.xml.sax.ext.LexicalHandler#endDTD()
     */
    public void endDTD() throws SAXException
    {

        m_handler.endDTD();
    }

    /**
     * Pass the call on to the underlying handler
     * @see org.xml.sax.ext.LexicalHandler#endEntity(String)
     */
    public void endEntity(String name) throws SAXException
    {
        if (m_firstTagNotEmitted)
        {
            emitFirstTag();
        }
        m_handler.endEntity(name);
    }

    /**
     * Pass the call on to the underlying handler
     * @see org.xml.sax.ext.LexicalHandler#startCDATA()
     */
    public void startCDATA() throws SAXException
    {
        m_handler.startCDATA();
    }

    /**
     * Pass the call on to the underlying handler
     * @see org.xml.sax.ext.LexicalHandler#startDTD(String, String, String)
     */
    public void startDTD(String name, String publicId, String systemId)
        throws SAXException
    {
        m_handler.startDTD(name, publicId, systemId);
    }

    /**
     * Pass the call on to the underlying handler
     * @see org.xml.sax.ext.LexicalHandler#startEntity(String)
     */
    public void startEntity(String name) throws SAXException
    {
        m_handler.startEntity(name);
    }

    /**
     * Initialize the wrapped output stream (XML or HTML).
     * If the stream handler should be HTML, then replace the XML handler with
     * an HTML handler. After than send the starting method calls that were cached
     * to the wrapped handler.
     *
     */
    private void initStreamOutput() throws SAXException
    {

        // Try to rule out if this is an not to be an HTML document based on prefix
        boolean firstElementIsHTML = isFirstElemHTML();

        if (firstElementIsHTML)
        {
            // create an HTML output handler, and initialize it

            // keep a reference to the old handler, ... it will soon be gone
            SerializationHandler oldHandler = m_handler;

            /* We have to make sure we get an output properties with the proper
             * defaults for the HTML method.  The easiest way to do this is to
             * have the OutputProperties class do it.
             */

            Properties htmlProperties =
                OutputPropertiesFactory.getDefaultMethodProperties(Method.HTML);
            Serializer serializer =
                SerializerFactory.getSerializer(htmlProperties);

            // The factory should be returning a ToStream
            // Don't know what to do if it doesn't
            // i.e. the user has over-ridden the content-handler property
            // for html
            m_handler = (SerializationHandler) serializer;
            //m_handler = new ToHTMLStream();

            Writer writer = oldHandler.getWriter();

            if (null != writer)
                m_handler.setWriter(writer);
            else
            {
                OutputStream os = oldHandler.getOutputStream();

                if (null != os)
                    m_handler.setOutputStream(os);
            }

            // need to copy things from the old handler to the new one here

            //            if (_setVersion_called)
            //            {
            m_handler.setVersion(oldHandler.getVersion());
            //            }
            //            if (_setDoctypeSystem_called)
            //            {
            m_handler.setDoctypeSystem(oldHandler.getDoctypeSystem());
            //            }
            //            if (_setDoctypePublic_called)
            //            {
            m_handler.setDoctypePublic(oldHandler.getDoctypePublic());
            //            }
            //            if (_setMediaType_called)
            //            {
            m_handler.setMediaType(oldHandler.getMediaType());
            //            }
            
            m_handler.setTransformer(oldHandler.getTransformer());
        }

        /* Now that we have a real wrapped handler (XML or HTML) lets
         * pass any cached calls to it
         */
        // Call startDocument() if necessary
        if (m_needToCallStartDocument)
        {
            m_handler.startDocument();
            m_needToCallStartDocument = false;
        }

        // the wrapped handler is now fully initialized
        m_wrapped_handler_not_initialized = false;
    }

    private void emitFirstTag() throws SAXException
    {   
        if (m_firstElementName != null)
        {
            if (m_wrapped_handler_not_initialized)
            {
                initStreamOutput();
                m_wrapped_handler_not_initialized = false;
            }
            // Output first tag
            m_handler.startElement(m_firstElementURI, null, m_firstElementName, m_attributes);
            // don't need the collected attributes of the first element anymore.
            m_attributes = null;

            // Output namespaces of first tag
            if (m_namespacePrefix != null)
            {
                final int n = m_namespacePrefix.size();
                for (int i = 0; i < n; i++)
                {
                    final String prefix =
                        (String) m_namespacePrefix.elementAt(i);
                    final String uri = (String) m_namespaceURI.elementAt(i);
                    m_handler.startPrefixMapping(prefix, uri, false);
                }
                m_namespacePrefix = null;
                m_namespaceURI = null;
            }
            m_firstTagNotEmitted = false;
        }
    }

    /**
     * Utility function for calls to local-name().
     *
     * Don't want to override static function on SerializerBase
     * So added Unknown suffix to method name.
     */
    private String getLocalNameUnknown(String value)
    {
        int idx = value.lastIndexOf(':');
        if (idx >= 0)
            value = value.substring(idx + 1);
        idx = value.lastIndexOf('@');
        if (idx >= 0)
            value = value.substring(idx + 1);
        return (value);
    }

    /**
         * Utility function to return prefix
         *
         * Don't want to override static function on SerializerBase
         * So added Unknown suffix to method name.
         */
    private String getPrefixPartUnknown(String qname)
    {
        final int index = qname.indexOf(':');
        return (index > 0) ? qname.substring(0, index) : EMPTYSTRING;
    }

    /**
     * Determine if the firts element in the document is <html> or <HTML>
     * This uses the cached first element name, first element prefix and the
     * cached namespaces from previous method calls
     *
     * @return true if the first element is an opening <html> tag
     */
    private boolean isFirstElemHTML()
    {
        boolean isHTML;

        // is the first tag html, not considering the prefix ?
        isHTML =
            getLocalNameUnknown(m_firstElementName).equalsIgnoreCase("html");

        // Try to rule out if this is not to be an HTML document based on URI
        if (isHTML
            && m_firstElementURI != null
            && !EMPTYSTRING.equals(m_firstElementURI))
        {
            // the <html> element has a non-trivial namespace
            isHTML = false;
        }
        // Try to rule out if this is an not to be an HTML document based on prefix
        if (isHTML && m_namespacePrefix != null)
        {
            /* the first element has a name of "html", but lets check the prefix.
             * If the prefix points to a namespace with a URL that is not ""
             * then the doecument doesn't start with an <html> tag, and isn't html
             */
            final int max = m_namespacePrefix.size();
            for (int i = 0; i < max; i++)
            {
                final String prefix = (String) m_namespacePrefix.elementAt(i);
                final String uri = (String) m_namespaceURI.elementAt(i);

                if (m_firstElementPrefix != null
                    && m_firstElementPrefix.equals(prefix)
                    && !EMPTYSTRING.equals(uri))
                {
                    // The first element has a prefix, so it can't be <html>
                    isHTML = false;
                    break;
                }
            }

        }
        return isHTML;
    }
    /**
     * @see Serializer#asDOMSerializer()
     */
    public DOMSerializer asDOMSerializer() throws IOException
    {
        return m_handler.asDOMSerializer();
    }

    /**
     * @param URI_and_localNames Vector a list of pairs of URI/localName
     * specified in the cdata-section-elements attribute.
     * @see SerializationHandler#setCdataSectionElements(java.util.Vector)
     */
    public void setCdataSectionElements(Vector URI_and_localNames)
    {
        m_handler.setCdataSectionElements(URI_and_localNames);
    }
    /**
     * @see ExtendedContentHandler#addAttributes(org.xml.sax.Attributes)
     */
    public void addAttributes(Attributes atts) throws SAXException
    {
        m_handler.addAttributes(atts);
    }

    /**
     * Get the current namespace mappings.
     * Simply returns the mappings of the wrapped handler.
     * @see ExtendedContentHandler#getNamespaceMappings()
     */
    public NamespaceMappings getNamespaceMappings()
    {
        NamespaceMappings mappings = null;
        if (m_handler != null)
        {
            mappings = m_handler.getNamespaceMappings();
        }
        return mappings;
    }
    /**
     * @see SerializationHandler#flushPending()
     */
    public void flushPending() throws SAXException
    {
 
        flush();
      
        m_handler.flushPending();
    }
    
    private void flush()
    {
        try
        {
        if (m_firstTagNotEmitted)
        {
            emitFirstTag();
        }
        if (m_needToCallStartDocument)
        {
            m_handler.startDocument();
            m_needToCallStartDocument = false;
        }
        }
        catch(SAXException e)
        {
            throw new RuntimeException(e.toString());
        }
          
    
    }

    /**
     * @see ExtendedContentHandler#getPrefix
     */
    public String getPrefix(String namespaceURI)
    {
        return m_handler.getPrefix(namespaceURI);
    }
    /**
     * @see ExtendedContentHandler#entityReference(java.lang.String)
     */
    public void entityReference(String entityName) throws SAXException
    {
        m_handler.entityReference(entityName);
    }

    /**
     * @see ExtendedContentHandler#getNamespaceURI(java.lang.String, boolean)
     */
    public String getNamespaceURI(String qname, boolean isElement)
    {
        return m_handler.getNamespaceURI(qname, isElement);
    }

    public String getNamespaceURIFromPrefix(String prefix)
    {
        return m_handler.getNamespaceURIFromPrefix(prefix);
    }

    public void setTransformer(Transformer t)
    {       
        m_handler.setTransformer(t);
        if ((t instanceof SerializerTrace) &&
            (((SerializerTrace) t).hasTraceListeners())) {
           m_tracer = (SerializerTrace) t;
        } else {
           m_tracer = null;
        }        
    }
    public Transformer getTransformer()
    {
        return m_handler.getTransformer();
    }

    /**
     * @see SerializationHandler#setContentHandler(org.xml.sax.ContentHandler)
     */
    public void setContentHandler(ContentHandler ch)
    {
        m_handler.setContentHandler(ch);
    }
    /**
     * This method is used to set the source locator, which might be used to
     * generated an error message.
     * @param locator the source locator
     *
     * @see ExtendedContentHandler#setSourceLocator(javax.xml.transform.SourceLocator)
     */    
    public void setSourceLocator(SourceLocator locator)
    {
        m_handler.setSourceLocator(locator);
    }

    protected void firePseudoElement(String elementName)
    {
        
        if (m_tracer != null) {
            StringBuffer sb = new StringBuffer();
                
            sb.append('<');
            sb.append(elementName);
            
            // convert the StringBuffer to a char array and
            // emit the trace event that these characters "might"
            // be written
            char ch[] = sb.toString().toCharArray();
            m_tracer.fireGenerateEvent(
                SerializerTrace.EVENTTYPE_OUTPUT_PSEUDO_CHARACTERS,
                ch,
                0,
                ch.length);
        }
    }
}