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 */
017package org.apache.camel.impl;
018
019import java.io.ByteArrayOutputStream;
020import java.io.InputStream;
021import java.io.OutputStream;
022import java.util.zip.Deflater;
023import java.util.zip.DeflaterOutputStream;
024import java.util.zip.InflaterInputStream;
025
026import org.apache.camel.Exchange;
027import org.apache.camel.spi.DataFormat;
028import org.apache.camel.util.IOHelper;
029
030/**
031 * "Deflate" compression data format.
032 * See {@link org.apache.camel.model.dataformat.ZipFileDataFormat} for Zip file compression.
033 */
034public class ZipDataFormat implements DataFormat {
035
036    private int compressionLevel;
037
038    public ZipDataFormat() {
039        this.compressionLevel = Deflater.BEST_SPEED;
040    }
041
042    public ZipDataFormat(int compressionLevel) {
043        this.compressionLevel = compressionLevel;
044    }
045
046    public int getCompressionLevel() {
047        return compressionLevel;
048    }
049
050    public void setCompressionLevel(int compressionLevel) {
051        this.compressionLevel = compressionLevel;
052    }
053
054    public void marshal(Exchange exchange, Object graph, OutputStream stream) throws Exception {
055        // ask for a mandatory type conversion to avoid a possible NPE beforehand as we do copy from the InputStream
056        InputStream is = exchange.getContext().getTypeConverter().mandatoryConvertTo(InputStream.class, exchange, graph);
057
058        DeflaterOutputStream zipOutput = new DeflaterOutputStream(stream, new Deflater(compressionLevel));
059        try {
060            IOHelper.copy(is, zipOutput);
061        } finally {
062            IOHelper.close(is, zipOutput);
063        }
064    }
065
066    public Object unmarshal(Exchange exchange, InputStream stream) throws Exception {
067        InputStream is = exchange.getIn().getMandatoryBody(InputStream.class);
068        InflaterInputStream unzipInput = new InflaterInputStream(is);
069        
070        // Create an expandable byte array to hold the inflated data
071        ByteArrayOutputStream bos = new ByteArrayOutputStream();
072        try {
073            IOHelper.copy(unzipInput, bos);
074            return bos.toByteArray();
075        } finally {
076            // must close input streams
077            IOHelper.close(is, unzipInput);
078        }
079    }
080
081}