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 
  24 
  25 
  26 package jdk.tools.jaotc.collect.jar;
  27 
  28 import jdk.tools.jaotc.collect.ClassSource;
  29 import jdk.tools.jaotc.collect.FileSupport;
  30 import jdk.tools.jaotc.collect.SearchPath;
  31 import jdk.tools.jaotc.collect.SourceProvider;
  32 
  33 import java.net.MalformedURLException;
  34 import java.nio.file.FileSystem;
  35 import java.nio.file.FileSystems;
  36 import java.nio.file.Path;
  37 import java.nio.file.ProviderNotFoundException;
  38 
  39 public final class JarSourceProvider implements SourceProvider {
  40     private final FileSystem fileSystem;
  41     private final FileSupport fileSupport;
  42     public static final String TYPE = "jar";
  43 
  44     public JarSourceProvider() {
  45         this(new FileSupport());
  46     }
  47 
  48     public JarSourceProvider(FileSupport fileSupport) {
  49         this.fileSupport = fileSupport;
  50         fileSystem = FileSystems.getDefault();
  51     }
  52 
  53     @Override
  54     public ClassSource findSource(String name, SearchPath searchPath) {
  55         Path fileName = fileSystem.getPath(name);
  56         Path jarFile = searchPath.find(fileSystem, fileName);
  57 
  58         if (!validPath(jarFile)) {
  59             return null;
  60         }
  61 
  62         return createSource(jarFile);
  63     }
  64 
  65     private ClassSource createSource(Path jarFile) {
  66         try {
  67             Path jarRootPath = fileSupport.getJarFileSystemRoot(jarFile);
  68             if (jarRootPath == null) {
  69                 return null;
  70             }
  71             ClassLoader classLoader = fileSupport.createClassLoader(jarFile);
  72             return new JarFileSource(jarFile, jarRootPath, classLoader);
  73         } catch (ProviderNotFoundException | MalformedURLException e) {
  74         }
  75         return null;
  76     }
  77 
  78     @Override
  79     public boolean supports(String type) {
  80         return TYPE.equals(type);
  81     }
  82 
  83     private boolean validPath(Path jarFile) {
  84         return jarFile != null && !fileSupport.isDirectory(jarFile);
  85     }
  86 }