/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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: SerializerSwitcher.java 468645 2006-10-28 06:57:24Z minchau $
*/
package org.apache.xalan.transformer;
import java.io.OutputStream;
import java.io.Writer;
import java.util.Properties;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.TransformerException;
import org.apache.xml.serializer.Serializer;
import org.apache.xml.serializer.SerializerFactory;
import org.apache.xml.serializer.Method;
import org.apache.xalan.templates.OutputProperties;
import org.xml.sax.ContentHandler;
/**
* This is a helper class that decides if Xalan needs to switch
* serializers, based on the first output element.
*/
public class SerializerSwitcher
{
/**
* Switch to HTML serializer if element is HTML
*
*
* @param transformer Non-null transformer instance
* @param ns Namespace URI of the element
* @param localName Local part of name of element
*
* @throws TransformerException
*/
public static void switchSerializerIfHTML(
TransformerImpl transformer, String ns, String localName)
throws TransformerException
{
if (null == transformer)
return;
if (((null == ns) || (ns.length() == 0))
&& localName.equalsIgnoreCase("html"))
{
// System.out.println("transformer.getOutputPropertyNoDefault(OutputKeys.METHOD): "+
// transformer.getOutputPropertyNoDefault(OutputKeys.METHOD));
// Access at level of hashtable to see if the method has been set.
if (null != transformer.getOutputPropertyNoDefault(OutputKeys.METHOD))
return;
// Getting the output properties this way won't cause a clone of
// the properties.
Properties prevProperties = transformer.getOutputFormat().getProperties();
// 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.
OutputProperties htmlOutputProperties = new OutputProperties(Method.HTML);
htmlOutputProperties.copyFrom(prevProperties, true);
Properties htmlProperties = htmlOutputProperties.getProperties();
try
{
// Serializer oldSerializer = transformer.getSerializer();
Serializer oldSerializer = null;
if (null != oldSerializer)
{
Serializer serializer =
SerializerFactory.getSerializer(htmlProperties);
Writer writer = oldSerializer.getWriter();
if (null != writer)
serializer.setWriter(writer);
else
{
OutputStream os = oldSerializer.getOutputStream();
if (null != os)
serializer.setOutputStream(os);
}
// transformer.setSerializer(serializer);
ContentHandler ch = serializer.asContentHandler();
transformer.setContentHandler(ch);
}
}
catch (java.io.IOException e)
{
throw new TransformerException(e);
}
}
}
/**
* Get the value of a property, without using the default properties. This
* can be used to test if a property has been explicitly set by the stylesheet
* or user.
*
* @param name The property name, which is a fully-qualified URI.
*
* @return The value of the property, or null if not found.
*
* @throws IllegalArgumentException If the property is not supported,
* and is not namespaced.
*/
private static String getOutputPropertyNoDefault(String qnameString, Properties props)
throws IllegalArgumentException
{
String value = (String)props.get(qnameString);
return value;
}
/**
* Switch to HTML serializer if element is HTML
*
*
* @param ns Namespace URI of the element
* @param localName Local part of name of element
*
* @throws TransformerException
* @return new contentHandler.
*/
public static Serializer switchSerializerIfHTML(
String ns, String localName, Properties props, Serializer oldSerializer)
throws TransformerException
{
Serializer newSerializer = oldSerializer;
if (((null == ns) || (ns.length() == 0))
&& localName.equalsIgnoreCase("html"))
{
// System.out.println("transformer.getOutputPropertyNoDefault(OutputKeys.METHOD): "+
// transformer.getOutputPropertyNoDefault(OutputKeys.METHOD));
// Access at level of hashtable to see if the method has been set.
if (null != getOutputPropertyNoDefault(OutputKeys.METHOD, props))
return newSerializer;
// Getting the output properties this way won't cause a clone of
// the properties.
Properties prevProperties = props;
// 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.
OutputProperties htmlOutputProperties = new OutputProperties(Method.HTML);
htmlOutputProperties.copyFrom(prevProperties, true);
Properties htmlProperties = htmlOutputProperties.getProperties();
// try
{
if (null != oldSerializer)
{
Serializer serializer =
SerializerFactory.getSerializer(htmlProperties);
Writer writer = oldSerializer.getWriter();
if (null != writer)
serializer.setWriter(writer);
else
{
OutputStream os = serializer.getOutputStream();
if (null != os)
serializer.setOutputStream(os);
}
newSerializer = serializer;
}
}
// catch (java.io.IOException e)
// {
// throw new TransformerException(e);
// }
}
return newSerializer;
}
}