001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  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.camel.dataformat.xstream;
018    
019    import java.io.InputStream;
020    import java.io.OutputStream;
021    import java.util.HashMap;
022    import java.util.Map;
023    
024    import javax.xml.stream.XMLStreamException;
025    
026    import com.thoughtworks.xstream.XStream;
027    import com.thoughtworks.xstream.io.HierarchicalStreamReader;
028    import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
029    import com.thoughtworks.xstream.io.xml.QNameMap;
030    import com.thoughtworks.xstream.io.xml.StaxReader;
031    import com.thoughtworks.xstream.io.xml.StaxWriter;
032    
033    import org.apache.camel.Exchange;
034    import org.apache.camel.spi.ClassResolver;
035    import org.codehaus.jettison.mapped.MappedXMLInputFactory;
036    import org.codehaus.jettison.mapped.MappedXMLOutputFactory;
037    
038    /**
039     * A <a href="http://camel.apache.org/data-format.html">data format</a>
040     * ({@link DataFormat}) using XStream and Jettison to marshal to and from JSON
041     *
042     * @version 
043     */
044    
045    public class JsonDataFormat extends AbstractXStreamWrapper {
046        private final MappedXMLOutputFactory mof;
047        private final MappedXMLInputFactory mif;
048        
049        public JsonDataFormat() {
050            final Map nstjsons = new HashMap();
051            mof = new MappedXMLOutputFactory(nstjsons);
052            mif = new MappedXMLInputFactory(nstjsons);
053        }
054    
055        @Override
056        protected XStream createXStream(ClassResolver resolver) {
057            XStream xs = super.createXStream(resolver);
058            xs.setMode(XStream.NO_REFERENCES);
059            return xs;
060        }
061    
062        protected HierarchicalStreamWriter createHierarchicalStreamWriter(Exchange exchange, Object body, OutputStream stream) throws XMLStreamException {        
063            return new StaxWriter(new QNameMap(), mof.createXMLStreamWriter(stream));
064        }
065    
066        protected HierarchicalStreamReader createHierarchicalStreamReader(Exchange exchange, InputStream stream) throws XMLStreamException {        
067            return new StaxReader(new QNameMap(), mif.createXMLStreamReader(stream));
068        }
069    }