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 /** 031 * "Deflate" compression data format. 032 * See {@link org.apache.camel.model.dataformat.ZipFileDataFormat} for Zip file compression. 033 */ 034 public 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 }