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.Deflater;
023    import java.util.zip.DeflaterOutputStream;
024    import java.util.zip.InflaterInputStream;
025    
026    import org.apache.camel.Exchange;
027    import org.apache.camel.spi.DataFormat;
028    import org.apache.camel.util.IOHelper;
029    
030    public class ZipDataFormat implements DataFormat {
031    
032        private final int compressionLevel;
033    
034        public ZipDataFormat() {
035            this.compressionLevel = Deflater.BEST_SPEED;
036        }
037    
038        public ZipDataFormat(int compressionLevel) {
039            this.compressionLevel = compressionLevel;
040        }
041    
042        public void marshal(Exchange exchange, Object graph, OutputStream stream) throws Exception {
043            // ask for a mandatory type conversion to avoid a possible NPE beforehand as we do copy from the InputStream
044            InputStream is = exchange.getContext().getTypeConverter().mandatoryConvertTo(InputStream.class, exchange, graph);
045    
046            DeflaterOutputStream zipOutput = new DeflaterOutputStream(stream, new Deflater(compressionLevel));
047            try {
048                IOHelper.copy(is, zipOutput);
049            } finally {
050                IOHelper.close(is, zipOutput);
051            }
052        }
053    
054        public Object unmarshal(Exchange exchange, InputStream stream) throws Exception {
055            InputStream is = exchange.getIn().getMandatoryBody(InputStream.class);
056            InflaterInputStream unzipInput = new InflaterInputStream(is);
057            
058            // Create an expandable byte array to hold the inflated data
059            ByteArrayOutputStream bos = new ByteArrayOutputStream();
060            try {
061                IOHelper.copy(unzipInput, bos);
062                return bos.toByteArray();
063            } finally {
064                // must close input streams
065                IOHelper.close(is, unzipInput);
066            }
067        }
068    
069    }