001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019package org.apache.commons.compress.compressors.bzip2; 020 021import java.util.LinkedHashMap; 022import java.util.Map; 023 024import org.apache.commons.compress.compressors.FileNameUtil; 025 026/** 027 * Utility code for the BZip2 compression format. 028 * @ThreadSafe 029 * @since 1.1 030 */ 031public abstract class BZip2Utils { 032 033 private static final FileNameUtil fileNameUtil; 034 035 static { 036 final Map<String, String> uncompressSuffix = 037 new LinkedHashMap<>(); 038 // backwards compatibility: BZip2Utils never created the short 039 // tbz form, so .tar.bz2 has to be added explicitly 040 uncompressSuffix.put(".tar.bz2", ".tar"); 041 uncompressSuffix.put(".tbz2", ".tar"); 042 uncompressSuffix.put(".tbz", ".tar"); 043 uncompressSuffix.put(".bz2", ""); 044 uncompressSuffix.put(".bz", ""); 045 fileNameUtil = new FileNameUtil(uncompressSuffix, ".bz2"); 046 } 047 048 /** 049 * Maps the given file name to the name that the file should have after 050 * compression with bzip2. Currently this method simply appends the suffix 051 * ".bz2" to the file name based on the standard behavior of the "bzip2" 052 * program, but a future version may implement a more complex mapping if 053 * a new widely used naming pattern emerges. 054 * 055 * @param fileName name of a file 056 * @return name of the corresponding compressed file 057 */ 058 public static String getCompressedFilename(final String fileName) { 059 return fileNameUtil.getCompressedFilename(fileName); 060 } 061 062 /** 063 * Maps the given name of a bzip2-compressed file to the name that the 064 * file should have after uncompression. Commonly used file type specific 065 * suffixes like ".tbz" or ".tbz2" are automatically detected and 066 * correctly mapped. For example the name "package.tbz2" is mapped to 067 * "package.tar". And any file names with the generic ".bz2" suffix 068 * (or any other generic bzip2 suffix) is mapped to a name without that 069 * suffix. If no bzip2 suffix is detected, then the file name is returned 070 * unmapped. 071 * 072 * @param fileName name of a file 073 * @return name of the corresponding uncompressed file 074 */ 075 public static String getUncompressedFilename(final String fileName) { 076 return fileNameUtil.getUncompressedFilename(fileName); 077 } 078 079 /** 080 * Detects common bzip2 suffixes in the given file name. 081 * 082 * @param fileName name of a file 083 * @return {@code true} if the file name has a common bzip2 suffix, 084 * {@code false} otherwise 085 */ 086 public static boolean isCompressedFilename(final String fileName) { 087 return fileNameUtil.isCompressedFilename(fileName); 088 } 089 090 /** Private constructor to prevent instantiation of this utility class. */ 091 private BZip2Utils() { 092 } 093 094}