1 /*
   2  * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package jdk.tools.jaotc.collect.jar;
  24 
  25 import jdk.tools.jaotc.collect.ClassSource;
  26 import jdk.tools.jaotc.collect.FileSupport;
  27 import jdk.tools.jaotc.collect.SearchPath;
  28 import jdk.tools.jaotc.collect.SourceProvider;
  29 
  30 import java.net.MalformedURLException;
  31 import java.nio.file.FileSystem;
  32 import java.nio.file.FileSystems;
  33 import java.nio.file.Path;
  34 import java.nio.file.ProviderNotFoundException;
  35 
  36 public class JarSourceProvider implements SourceProvider {
  37     private final FileSystem fileSystem;
  38     private final FileSupport fileSupport;
  39     public final static String TYPE = "jar";
  40 
  41     public JarSourceProvider() {
  42         this(new FileSupport());
  43     }
  44 
  45     public JarSourceProvider(FileSupport fileSupport) {
  46         this.fileSupport = fileSupport;
  47         fileSystem = FileSystems.getDefault();
  48     }
  49 
  50     @Override
  51     public ClassSource findSource(String name, SearchPath searchPath) {
  52         Path fileName = fileSystem.getPath(name);
  53         Path jarFile = searchPath.find(fileSystem, fileName);
  54 
  55         if (!validPath(jarFile)) {
  56             return null;
  57         }
  58 
  59         return createSource(jarFile);
  60     }
  61 
  62     private ClassSource createSource(Path jarFile) {
  63         try {
  64             Path jarRootPath = fileSupport.getJarFileSystemRoot(jarFile);
  65             if (jarRootPath == null) {
  66                 return null;
  67             }
  68             ClassLoader classLoader = fileSupport.createClassLoader(jarFile);
  69             return new JarFileSource(jarFile, jarRootPath, classLoader);
  70         } catch (ProviderNotFoundException | MalformedURLException e) {
  71         }
  72         return null;
  73     }
  74 
  75     @Override
  76     public boolean supports(String type) {
  77         return TYPE.equals(type);
  78     }
  79 
  80     private boolean validPath(Path jarFile) {
  81         return jarFile != null && !fileSupport.isDirectory(jarFile);
  82     }
  83 }