| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.commons.compress.compressors.xz; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import org.apache.commons.compress.compressors.FileNameUtil; |
| |
| /** |
| * Utility code for the xz compression format. |
| * @ThreadSafe |
| * @since 1.4 |
| */ |
| public class XZUtils { |
| |
| private static final FileNameUtil fileNameUtil; |
| |
| static { |
| Map<String, String> uncompressSuffix = new HashMap<String, String>(); |
| uncompressSuffix.put(".txz", ".tar"); |
| uncompressSuffix.put(".xz", ""); |
| uncompressSuffix.put("-xz", ""); |
| fileNameUtil = new FileNameUtil(uncompressSuffix, ".xz"); |
| } |
| |
| /** Private constructor to prevent instantiation of this utility class. */ |
| private XZUtils() { |
| } |
| |
| /** |
| * Are the classes required to support XZ compression available? |
| * @since 1.5 |
| */ |
| public static boolean isXZCompressionAvailable() { |
| try { |
| XZCompressorInputStream.matches(null, 0); |
| return true; |
| } catch (NoClassDefFoundError error) { |
| return false; |
| } |
| } |
| |
| /** |
| * Detects common xz suffixes in the given filename. |
| * |
| * @param filename name of a file |
| * @return {@code true} if the filename has a common xz suffix, |
| * {@code false} otherwise |
| */ |
| public static boolean isCompressedFilename(String filename) { |
| return fileNameUtil.isCompressedFilename(filename); |
| } |
| |
| /** |
| * Maps the given name of a xz-compressed file to the name that the |
| * file should have after uncompression. Commonly used file type specific |
| * suffixes like ".txz" are automatically detected and |
| * correctly mapped. For example the name "package.txz" is mapped to |
| * "package.tar". And any filenames with the generic ".xz" suffix |
| * (or any other generic xz suffix) is mapped to a name without that |
| * suffix. If no xz suffix is detected, then the filename is returned |
| * unmapped. |
| * |
| * @param filename name of a file |
| * @return name of the corresponding uncompressed file |
| */ |
| public static String getUncompressedFilename(String filename) { |
| return fileNameUtil.getUncompressedFilename(filename); |
| } |
| |
| /** |
| * Maps the given filename to the name that the file should have after |
| * compression with xz. Common file types with custom suffixes for |
| * compressed versions are automatically detected and correctly mapped. |
| * For example the name "package.tar" is mapped to "package.txz". If no |
| * custom mapping is applicable, then the default ".xz" suffix is appended |
| * to the filename. |
| * |
| * @param filename name of a file |
| * @return name of the corresponding compressed file |
| */ |
| public static String getCompressedFilename(String filename) { |
| return fileNameUtil.getCompressedFilename(filename); |
| } |
| |
| } |