001// *************************************************************************************************************************** 002// * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file * 003// * distributed with this work for additional information regarding copyright ownership. The ASF licenses this file * 004// * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance * 005// * with the License. You may obtain a copy of the License at * 006// * * 007// * http://www.apache.org/licenses/LICENSE-2.0 * 008// * * 009// * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an * 010// * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the * 011// * specific language governing permissions and limitations under the License. * 012// *************************************************************************************************************************** 013package org.apache.juneau.utils; 014 015import static org.apache.juneau.internal.IOUtils.*; 016 017import java.io.*; 018import java.net.*; 019import java.util.*; 020import java.util.jar.*; 021 022import org.apache.juneau.*; 023 024/** 025 * Utility class for working with Jar manifest files. 026 * 027 * <p> 028 * Copies the contents of a {@link Manifest} into an {@link ObjectMap} so that the various convenience methods on that 029 * class can be used to retrieve values. 030 */ 031public class ManifestFile extends ObjectMap { 032 033 private static final long serialVersionUID = 1L; 034 035 /** 036 * Create an instance of this class from a manifest file on the file system. 037 * 038 * @param f The manifest file. 039 * @throws IOException If a problem occurred while trying to read the manifest file. 040 */ 041 public ManifestFile(File f) throws IOException { 042 Manifest mf = new Manifest(); 043 try (FileInputStream fis = new FileInputStream(f)) { 044 mf.read(fis); 045 load(mf); 046 } catch (IOException e) { 047 throw new IOException("Problem detected in MANIFEST.MF. Contents below:\n" + read(f), e); 048 } 049 } 050 051 /** 052 * Create an instance of this class from a {@link Manifest} object. 053 * 054 * @param f The manifest to read from. 055 */ 056 public ManifestFile(Manifest f) { 057 load(f); 058 } 059 060 /** 061 * Finds and loads the manifest file of the jar file that the specified class is contained within. 062 * 063 * @param c The class to get the manifest file of. 064 * @throws IOException If a problem occurred while trying to read the manifest file. 065 */ 066 public ManifestFile(Class<?> c) throws IOException { 067 String className = c.getSimpleName() + ".class"; 068 String classPath = c.getResource(className).toString(); 069 if (! classPath.startsWith("jar")) { 070 return; 071 } 072 String manifestPath = classPath.substring(0, classPath.lastIndexOf("!") + 1) + "/META-INF/MANIFEST.MF"; 073 try { 074 Manifest mf = new Manifest(new URL(manifestPath).openStream()); 075 load(mf); 076 } catch (MalformedURLException e) { 077 throw new IOException(e); 078 } catch (IOException e) { 079 e.printStackTrace(); 080 } 081 } 082 083 private void load(Manifest mf) { 084 for (Map.Entry<Object,Object> e : mf.getMainAttributes().entrySet()) 085 put(e.getKey().toString(), e.getValue().toString()); 086 } 087}