transformerimpl.java

java1.6众多例子参考

                ((SAXSource)source).getInputSource()==null &&
                ((SAXSource)source).getXMLReader()==null )||
                (source instanceof DOMSource && 
                ((DOMSource)source).getNode()==null)){
                        DocumentBuilderFactory builderF = 
                                DocumentBuilderFactory.newInstance();
                        DocumentBuilder builder = 
                                builderF.newDocumentBuilder();
                        String systemID = source.getSystemId();
                        source = new DOMSource(builder.newDocument());

                        // Copy system ID from original, empty Source to new
                        if (systemID != null) {
                          source.setSystemId(systemID);
                        }
            }           
	    if (_isIdentity) {
		transformIdentity(source, handler);
	    } else {
		_translet.transform(getDOM(source), handler);
	    }
	} catch (TransletException e) {
	    if (_errorListener != null)	postErrorToListener(e.getMessage());
	    throw new TransformerException(e);
	} catch (RuntimeException e) {
	    if (_errorListener != null)	postErrorToListener(e.getMessage());
	    throw new TransformerException(e);
	} catch (Exception e) {
	    if (_errorListener != null)	postErrorToListener(e.getMessage());
	    throw new TransformerException(e);
	} finally {
            _dtmManager = null;
        }

	// If we create an output stream for the Result, we need to close it after the transformation.
	if (_ostream != null) {
	    try {
	        _ostream.close();
	    }
	    catch (IOException e) {}
	    _ostream = null;
	}
    }

    /**
     * Implements JAXP's Transformer.getErrorListener()
     * Get the error event handler in effect for the transformation.
     *
     * @return The error event handler currently in effect
     */
    public ErrorListener getErrorListener() {  
	return _errorListener; 
    }

    /**
     * Implements JAXP's Transformer.setErrorListener()
     * Set the error event listener in effect for the transformation.
     * Register a message handler in the translet in order to forward
     * xsl:messages to error listener.
     *
     * @param listener The error event listener to use
     * @throws IllegalArgumentException
     */
    public void setErrorListener(ErrorListener listener)
	throws IllegalArgumentException {
        if (listener == null) {
	    ErrorMsg err = new ErrorMsg(ErrorMsg.ERROR_LISTENER_NULL_ERR,
					"Transformer");
            throw new IllegalArgumentException(err.toString());
	}
        _errorListener = listener;
        
	// Register a message handler to report xsl:messages
    if (_translet != null)
    	_translet.setMessageHandler(new MessageHandler(_errorListener));
    }

    /**
     * Inform TrAX error listener of an error
     */
    private void postErrorToListener(String message) {
        try {
            _errorListener.error(new TransformerException(message));
	}
	catch (TransformerException e) {
            // ignored - transformation cannot be continued
        }
    }

    /**
     * Inform TrAX error listener of a warning
     */
    private void postWarningToListener(String message) {
        try {
            _errorListener.warning(new TransformerException(message));
        }
	catch (TransformerException e) {
            // ignored - transformation cannot be continued
        }
    }

    /**
     * The translet stores all CDATA sections set in the <xsl:output> element
     * in a Hashtable. This method will re-construct the whitespace separated
     * list of elements given in the <xsl:output> element.
     */
    private String makeCDATAString(Hashtable cdata) {
	// Return a 'null' string if no CDATA section elements were specified
	if (cdata == null) return null;

	StringBuffer result = new StringBuffer();

	// Get an enumeration of all the elements in the hashtable
	Enumeration elements = cdata.keys();
	if (elements.hasMoreElements()) {
	    result.append((String)elements.nextElement());
	    while (elements.hasMoreElements()) {
		String element = (String)elements.nextElement();
		result.append(' ');
		result.append(element);
	    }
	}
	
	return(result.toString());
    }

    /**
     * Implements JAXP's Transformer.getOutputProperties().
     * Returns a copy of the output properties for the transformation. This is
     * a set of layered properties. The first layer contains properties set by
     * calls to setOutputProperty() and setOutputProperties() on this class,
     * and the output settings defined in the stylesheet's <xsl:output>
     * element makes up the second level, while the default XSLT output
     * settings are returned on the third level.
     *
     * @return Properties in effect for this Transformer
     */
    public Properties getOutputProperties() { 
	return (Properties) _properties.clone();
    }

    /**
     * Implements JAXP's Transformer.getOutputProperty().
     * Get an output property that is in effect for the transformation. The
     * property specified may be a property that was set with setOutputProperty,
     * or it may be a property specified in the stylesheet.
     *
     * @param name A non-null string that contains the name of the property
     * @throws IllegalArgumentException if the property name is not known
     */
    public String getOutputProperty(String name)
	throws IllegalArgumentException 
    {
	if (!validOutputProperty(name)) {
	    ErrorMsg err = new ErrorMsg(ErrorMsg.JAXP_UNKNOWN_PROP_ERR, name);
	    throw new IllegalArgumentException(err.toString());
	}
	return _properties.getProperty(name);
    }

    /**
     * Implements JAXP's Transformer.setOutputProperties().
     * Set the output properties for the transformation. These properties
     * will override properties set in the Templates with xsl:output.
     * Unrecognised properties will be quitely ignored.
     *
     * @param properties The properties to use for the Transformer
     * @throws IllegalArgumentException Never, errors are ignored
     */
    public void setOutputProperties(Properties properties) 
	throws IllegalArgumentException 
    {
	if (properties != null) {
	    final Enumeration names = properties.propertyNames();

	    while (names.hasMoreElements()) {
		final String name = (String) names.nextElement();

		// Ignore lower layer properties
		if (isDefaultProperty(name, properties)) continue;

		if (validOutputProperty(name)) {
		    _properties.setProperty(name, properties.getProperty(name));
		}
		else {
		    ErrorMsg err = new ErrorMsg(ErrorMsg.JAXP_UNKNOWN_PROP_ERR, name);
		    throw new IllegalArgumentException(err.toString());
		}
	    }
	}
	else {
	    _properties = _propertiesClone;
	}
    }

    /**
     * Implements JAXP's Transformer.setOutputProperty().
     * Get an output property that is in effect for the transformation. The
     * property specified may be a property that was set with 
     * setOutputProperty(), or it may be a property specified in the stylesheet.
     *
     * @param name The name of the property to set
     * @param value The value to assign to the property
     * @throws IllegalArgumentException Never, errors are ignored
     */
    public void setOutputProperty(String name, String value)
	throws IllegalArgumentException 
    {
	if (!validOutputProperty(name)) {
	    ErrorMsg err = new ErrorMsg(ErrorMsg.JAXP_UNKNOWN_PROP_ERR, name);
	    throw new IllegalArgumentException(err.toString());
	}
	_properties.setProperty(name, value);
    }

    /**
     * Internal method to pass any properties to the translet prior to
     * initiating the transformation
     */
    private void transferOutputProperties(AbstractTranslet translet)
    {
	// Return right now if no properties are set
	if (_properties == null) return;

	// Get a list of all the defined properties
	Enumeration names = _properties.propertyNames();
	while (names.hasMoreElements()) {
	    // Note the use of get() instead of getProperty()
	    String name  = (String) names.nextElement();
	    String value = (String) _properties.get(name);

	    // Ignore default properties
	    if (value == null) continue;

	    // Pass property value to translet - override previous setting
	    if (name.equals(OutputKeys.ENCODING)) {
		translet._encoding = value;
	    }
	    else if (name.equals(OutputKeys.METHOD)) {
		translet._method = value;
	    }
	    else if (name.equals(OutputKeys.DOCTYPE_PUBLIC)) {
		translet._doctypePublic = value;
	    }
	    else if (name.equals(OutputKeys.DOCTYPE_SYSTEM)) {
		translet._doctypeSystem = value;
	    }
	    else if (name.equals(OutputKeys.MEDIA_TYPE)) {
		translet._mediaType = value;
	    }
	    else if (name.equals(OutputKeys.STANDALONE)) {
		translet._standalone = value;
	    }
	    else if (name.equals(OutputKeys.VERSION)) {
		translet._version = value;
	    }
	    else if (name.equals(OutputKeys.OMIT_XML_DECLARATION)) {
		translet._omitHeader = 
		    (value != null && value.toLowerCase().equals("yes"));
	    }
	    else if (name.equals(OutputKeys.INDENT)) {
		translet._indent = 
		    (value != null && value.toLowerCase().equals("yes"));
	    }
            else if (name.equals(OutputPropertiesFactory.S_BUILTIN_OLD_EXTENSIONS_UNIVERSAL +"indent-amount")) {
                 if (value != null) {
                     translet._indentamount = Integer.parseInt(value);
                 }
            }
            else if (name.equals(OutputPropertiesFactory.S_BUILTIN_EXTENSIONS_UNIVERSAL +"indent-amount")) {
                 if (value != null) {
                     translet._indentamount = Integer.parseInt(value);
                 }
            }
	    else if (name.equals(OutputKeys.CDATA_SECTION_ELEMENTS)) {
		if (value != null) {
		    translet._cdata = null; // clear previous setting
		    StringTokenizer e = new StringTokenizer(value);
		    while (e.hasMoreTokens()) {
			translet.addCdataElement(e.nextToken());
		    }
		}
	    }
	}
    }

    /**
     * This method is used to pass any properties to the output handler
     * when running the identity transform.
     */
    public void transferOutputProperties(SerializationHandler handler)
    {
	// Return right now if no properties are set
	if (_properties == null) return;

	String doctypePublic = null;
	String doctypeSystem = null;

	// Get a list of all the defined properties
	Enumeration names = _properties.propertyNames();
	while (names.hasMoreElements()) {
	    // Note the use of get() instead of getProperty()
	    String name  = (String) names.nextElement();
	    String value = (String) _properties.get(name);

	    // Ignore default properties
	    if (value == null) continue;

	    // Pass property value to translet - override previous setting
	    if (name.equals(OutputKeys.DOCTYPE_PUBLIC)) {
		doctypePublic = value;
	    }
	    else if (name.equals(OutputKeys.DOCTYPE_SYSTEM)) {
		doctypeSystem = value;
	    }
	    else if (name.equals(OutputKeys.MEDIA_TYPE)) {
		handler.setMediaType(value);
	    }
	    else if (name.equals(OutputKeys.STANDALONE)) {
		handler.setStandalone(value);
	    }
	    else if (name.equals(OutputKeys.VERSION)) {
		handler.setVersion(value);
	    }
	    else if (name.equals(OutputKeys.OMIT_XML_DECLARATION)) {
		handler.setOmitXMLDeclaration(
		    value != null && value.toLowerCase().equals("yes"));
	    }
	    else if (name.equals(OutputKeys.INDENT)) {
		handler.setIndent( 
		    value != null && value.toLowerCase().equals("yes"));
	    }
            else if (name.equals(OutputPropertiesFactory.S_BUILTIN_OLD_EXTENSIONS_UNIVERSAL +"indent-amount")) {
                if (value != null) {
                    handler.setIndentAmount(Integer.parseInt(value));
                }
            }
            else if (name.equals(OutputPropertiesFactory.S_BUILTIN_EXTENSIONS_UNIVERSAL +"indent-amount")) {
                if (value != null) {
                    handler.setIndentAmount(Integer.parseInt(value));
                }
            } 
	    else if (name.equals(OutputKeys.CDATA_SECTION_ELEMENTS)) {
		if (value != null) {
		    StringTokenizer e = new StringTokenizer(value);