org.directwebremoting.convert.JDOMConverter Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of dwr Show documentation

DWR is easy Ajax for Java. It makes it simple to call Java code directly from Javascript. It gets rid of almost all the boiler plate code between the web browser and your Java code.

There is a newer version: 3.0.2-RELEASE

Show newest version

/*
 * 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 org.directwebremoting.dwrp.SimpleOutboundVariable;
import org.directwebremoting.extend.Converter;
import org.directwebremoting.extend.InboundContext;
import org.directwebremoting.extend.InboundVariable;
import org.directwebremoting.extend.MarshallException;
import org.directwebremoting.extend.OutboundContext;
import org.directwebremoting.extend.OutboundVariable;
import org.directwebremoting.extend.EnginePrivate;
import org.directwebremoting.util.LocalUtil;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.input.SAXBuilder;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;

/**
 * An implementation of Converter for DOM objects.
 * @author Joe Walker [joe at eireneh dot com]
 * @version $Id: StringConverter.java,v 1.2 2004/11/04 15:54:07 joe_walker Exp $
 */
public class JDOMConverter extends BaseV20Converter implements Converter
{
    /* (non-Javadoc)
     * @see org.directwebremoting.Converter#convertInbound(java.lang.Class, org.directwebremoting.InboundVariable, org.directwebremoting.InboundContext)
     */
    public Object convertInbound(Class paramType, InboundVariable iv, InboundContext inctx) throws MarshallException
    {
        String value = LocalUtil.decode(iv.getValue());

        try
        {
            SAXBuilder builder = new SAXBuilder();
            Document doc = builder.build(new StringReader(value));

            if (paramType == Document.class)
            {
                return doc;
            }
            else if (paramType == Element.class)
            {
                return doc.getRootElement();
            }

            throw new MarshallException(paramType);
        }
        catch (MarshallException ex)
        {
            throw ex;
        }
        catch (Exception ex)
        {
            throw new MarshallException(paramType, ex);
        }
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.Converter#convertOutbound(java.lang.Object, org.directwebremoting.OutboundContext)
     */
    public OutboundVariable convertOutbound(Object data, OutboundContext outctx) throws MarshallException
    {
        try
        {
            Format outformat = Format.getCompactFormat();
            outformat.setEncoding("UTF-8");

            // Setup the destination
            StringWriter xml = new StringWriter();

            XMLOutputter writer = new XMLOutputter(outformat);

            // Using XSLT to convert to a stream. Setup the source
            if (data instanceof Document)
            {
                Document doc = (Document) data;
                writer.output(doc, xml);
            }
            else if (data instanceof Element)
            {
                Element ele = (Element) data;
                writer.output(ele, xml);
            }
            else
            {
                throw new MarshallException(data.getClass());
            }

            xml.flush();

            String script = EnginePrivate.xmlStringToJavascriptDom(xml.toString());
            OutboundVariable ov = new SimpleOutboundVariable(script, outctx, false);

            outctx.put(data, ov);

            return ov;
        }
        catch (MarshallException ex)
        {
            throw ex;
        }
        catch (Exception ex)
        {
            throw new MarshallException(data.getClass(), ex);
        }
    }
}