/*
* Copyright 2005 Joe Walker
*
* 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.
*/
package org.directwebremoting.convert;
import java.io.StringReader;
import java.io.StringWriter;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.directwebremoting.ConversionException;
import org.directwebremoting.extend.AbstractConverter;
import org.directwebremoting.extend.EnginePrivate;
import org.directwebremoting.extend.InboundVariable;
import org.directwebremoting.extend.NonNestedOutboundVariable;
import org.directwebremoting.extend.OutboundContext;
import org.directwebremoting.extend.OutboundVariable;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.xml.sax.InputSource;
/**
* An implementation of Converter for DOM objects.
* @author Joe Walker [joe at getahead dot ltd dot uk]
*/
public class DOMConverter extends AbstractConverter
{
/* (non-Javadoc)
* @see org.directwebremoting.Converter#convertInbound(java.lang.Class, org.directwebremoting.InboundVariable, org.directwebremoting.InboundContext)
*/
public Object convertInbound(Class<?> paramType, InboundVariable data) throws ConversionException
{
if (data.isNull())
{
return null;
}
String value = data.urlDecode();
try
{
if (buildFactory == null)
{
buildFactory = DocumentBuilderFactory.newInstance();
}
DocumentBuilder builder = buildFactory.newDocumentBuilder();
InputSource is = new InputSource(new StringReader(value));
Document doc = builder.parse(is);
if (paramType == Document.class)
{
return doc;
}
else if (paramType == Element.class)
{
return doc.getDocumentElement();
}
throw new ConversionException(paramType);
}
catch (ConversionException ex)
{
throw ex;
}
catch (Exception ex)
{
throw new ConversionException(paramType, ex);
}
}
/* (non-Javadoc)
* @see org.directwebremoting.Converter#convertOutbound(java.lang.Object, org.directwebremoting.OutboundContext)
*/
public OutboundVariable convertOutbound(Object data, OutboundContext outctx) throws ConversionException
{
try
{
Transformer transformer = xslFact.newTransformer();
// Using XSLT to convert to a stream. Setup the source
Source source;
if (data instanceof Node)
{
Node node = (Node) data;
source = new DOMSource(node);
}
else
{
throw new ConversionException(data.getClass());
}
// Setup the destination
StringWriter xml = new StringWriter();
StreamResult result = new StreamResult(xml);
transformer.transform(source, result);
xml.flush();
String script;
if (data instanceof Element)
{
script = EnginePrivate.xmlStringToJavascriptDomElement(xml.toString());
}
else
{
script = EnginePrivate.xmlStringToJavascriptDomDocument(xml.toString());
}
OutboundVariable ov = new NonNestedOutboundVariable(script);
outctx.put(data, ov);
return ov;
}
catch (ConversionException ex)
{
throw ex;
}
catch (Exception ex)
{
throw new ConversionException(data.getClass(), ex);
}
}
/**
* How we create new transformers
*/
private final TransformerFactory xslFact = TransformerFactory.newInstance();
/**
* How we create new documents
*/
private DocumentBuilderFactory buildFactory = null;
}