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.impl;
018    
019    import java.io.ByteArrayOutputStream;
020    import java.io.InputStream;
021    import java.io.OutputStream;
022    import java.util.zip.GZIPInputStream;
023    import java.util.zip.GZIPOutputStream;
024    
025    import org.apache.camel.Exchange;
026    import org.apache.camel.spi.DataFormat;
027    import org.apache.camel.util.IOHelper;
028    
029    public class GzipDataFormat implements DataFormat {
030    
031        public void marshal(Exchange exchange, Object graph, OutputStream stream) throws Exception {
032            InputStream is = exchange.getContext().getTypeConverter().mandatoryConvertTo(InputStream.class, graph);
033    
034            GZIPOutputStream zipOutput = new GZIPOutputStream(stream);
035            try {
036                IOHelper.copy(is, zipOutput);
037            } finally {
038                IOHelper.close(is, zipOutput);
039            }
040        }
041    
042        public Object unmarshal(Exchange exchange, InputStream stream) throws Exception {
043            InputStream is = exchange.getIn().getMandatoryBody(InputStream.class);
044            GZIPInputStream unzipInput = new GZIPInputStream(is);
045            
046            // Create an expandable byte array to hold the inflated data
047            ByteArrayOutputStream bos = new ByteArrayOutputStream();
048            try {
049                IOHelper.copy(unzipInput, bos);
050                return bos.toByteArray();
051            } finally {
052                IOHelper.close(unzipInput);
053            }
054        }
055    
056    }