001/* 002 * Copyright 2007-2018 The jdeb developers. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.vafer.jdeb; 018 019import java.io.OutputStream; 020 021import org.apache.commons.compress.compressors.CompressorException; 022import org.apache.commons.compress.compressors.CompressorStreamFactory; 023 024/** 025 * Compression method used for the data file. 026 */ 027public enum Compression { 028 029 NONE(""), 030 GZIP(".gz"), 031 BZIP2(".bz2"), 032 XZ(".xz"); 033 034 private String extension; 035 036 private Compression(String extension) { 037 this.extension = extension; 038 } 039 040 /** 041 * Returns the extension of the compression method 042 */ 043 public String getExtension() { 044 return extension; 045 } 046 047 public OutputStream toCompressedOutputStream(OutputStream out) throws CompressorException { 048 switch (this) { 049 case GZIP: 050 return new CompressorStreamFactory().createCompressorOutputStream("gz", out); 051 case BZIP2: 052 return new CompressorStreamFactory().createCompressorOutputStream("bzip2", out); 053 case XZ: 054 return new CompressorStreamFactory().createCompressorOutputStream("xz", out); 055 default: 056 return out; 057 } 058 } 059 060 /** 061 * Returns the compression method corresponding to the specified name. 062 * The matching is case insensitive. 063 * 064 * @param name the name of the compression method 065 * @return the compression method, or null if not recognized 066 */ 067 public static Compression toEnum(String name) { 068 if ("gzip".equalsIgnoreCase(name) || "gz".equalsIgnoreCase(name)) { 069 return GZIP; 070 } else if ("bzip2".equalsIgnoreCase(name) || "bz2".equalsIgnoreCase(name)) { 071 return BZIP2; 072 } else if ("xz".equalsIgnoreCase(name)) { 073 return XZ; 074 } else if ("none".equalsIgnoreCase(name)) { 075 return NONE; 076 } else { 077 return null; 078 } 079 } 080}