001    /**
002     *
003     * Copyright 2005 The Apache Software Foundation
004     *
005     *  Licensed under the Apache License, Version 2.0 (the "License");
006     *  you may not use this file except in compliance with the License.
007     *  You may obtain a copy of the License at
008     *
009     *     http://www.apache.org/licenses/LICENSE-2.0
010     *
011     *  Unless required by applicable law or agreed to in writing, software
012     *  distributed under the License is distributed on an "AS IS" BASIS,
013     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     *  See the License for the specific language governing permissions and
015     *  limitations under the License.
016     */
017    package org.apache.geronimo.kernel.config.xstream;
018    
019    import java.io.IOException;
020    
021    import com.thoughtworks.xstream.converters.Converter;
022    import com.thoughtworks.xstream.converters.MarshallingContext;
023    import com.thoughtworks.xstream.converters.UnmarshallingContext;
024    import com.thoughtworks.xstream.converters.ConversionException;
025    import com.thoughtworks.xstream.io.HierarchicalStreamReader;
026    import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
027    import org.w3c.dom.Element;
028    import org.w3c.dom.NodeList;
029    import org.w3c.dom.Node;
030    
031    /**
032     * @version $Rev: 410741 $ $Date: 2006-05-31 21:35:48 -0700 (Wed, 31 May 2006) $
033     */
034    public class XStreamGBeanStateConverter implements Converter {
035        public boolean canConvert(Class clazz) {
036            return XStreamGBeanState.class.isAssignableFrom(clazz);
037        }
038    
039        public void marshal(Object object, HierarchicalStreamWriter writer, MarshallingContext marshallingContext) {
040            XStreamGBeanState gbeanState = (XStreamGBeanState) object;
041            Element element = null;
042            try {
043                element = gbeanState.getGBeanState();
044            } catch (IOException e) {
045                throw new ConversionException("Cannot get xml version of gbeans", e);
046            }
047            marshallingContext.convertAnother(element);
048        }
049    
050        public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext unmarshallingContext) {
051            Element element = (Element) unmarshallingContext.convertAnother(reader, Element.class);
052            NodeList childNodes = element.getChildNodes();
053            for (int i = 0; i < childNodes.getLength(); i ++) {
054                Node node = childNodes.item(i);
055                if (node instanceof Element) {
056                    element = (Element) node;
057                    return new XStreamGBeanState(element);
058                }
059            }
060            throw new ConversionException("No nested nodes found");
061        }
062    }