/**
* Copyright (c) 2011-2012 Optimax Software Ltd.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of Optimax Software, ElasticInbox, nor the names
* of its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.elasticinbox.core.blob.compression;
import java.io.InputStream;
import java.util.zip.DeflaterInputStream;
import java.util.zip.InflaterInputStream;
/**
* This class provides compression/decompression using Deflate algorithm.
* <p>
* Deflate compression (RFC1951) used in ElasticInbox due to a number of reasons:
* <p>
* 1. It is possible to serve deflated content over HTTP without decompression.
* <p>
* 2. It is possible to serve deflated content over IMAP without decompression.
* IMAP COMPRESS Extension (RFC4978) recognizes only deflate.
* <p>
* 3. Deflate has better performance in comparison to Gzip and provides good trade
* off between size and speed.
*
* @author Rustam Aliyev
*/
public class DeflateCompressionHandler implements CompressionHandler
{
public final static String COMPRESSION_TYPE_DEFLATE = "dfl";
@Override
public InputStream compress(InputStream in) {
return new DeflaterInputStream(in);
}
@Override
public InputStream uncompress(InputStream in) {
return new InflaterInputStream(in);
}
@Override
public String getType() {
return COMPRESSION_TYPE_DEFLATE;
}
}