1 /*
   2  * Copyright (c) 2012 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package org.openjdk.tests.separate;
  27 
  28 import java.util.HashMap;
  29 import java.io.File;
  30 import java.io.FileInputStream;
  31 import java.io.IOException;
  32 
  33 class DirectedClassLoader extends ClassLoader {
  34 
  35     private HashMap<String,File> loadLocations;
  36     private File defaultLocation;
  37     private ClassFilePreprocessor[] preprocessors;
  38 
  39     public DirectedClassLoader(
  40             HashMap<String,File> locations, File fallback,
  41             ClassFilePreprocessor ... preprocessors) {
  42         loadLocations = new HashMap<>(locations);
  43         defaultLocation = fallback;
  44         this.preprocessors = preprocessors;
  45     }
  46 
  47     public DirectedClassLoader(
  48             File fallback, ClassFilePreprocessor ... preprocessors) {
  49         loadLocations = new HashMap<>();
  50         defaultLocation = fallback;
  51         this.preprocessors = preprocessors;
  52     }
  53 
  54     public DirectedClassLoader(ClassFilePreprocessor ... preprocessors) {
  55         this((File)null, preprocessors);
  56     }
  57 
  58     public void setDefaultLocation(File dir) { this.defaultLocation = dir; }
  59     public void setLocationFor(String name, File dir) {
  60         loadLocations.put(name, dir);
  61     }
  62 
  63     @Override
  64     protected Class<?> findClass(String name) {
  65         String path = name.replace(".", File.separator) + ".class";
  66 
  67         File location = loadLocations.get(name);
  68         if (location == null || !(new File(location, path)).exists()) {
  69             File def = new File(defaultLocation, path);
  70             if (def.exists()) {
  71                 return defineFrom(name, new File(location, path));
  72             }
  73         } else {
  74             return defineFrom(name, new File(location, path));
  75         }
  76         return null;
  77     }
  78 
  79     private Class<?> defineFrom(String name, File file) {
  80         FileInputStream fis = null;
  81         try {
  82             try {
  83                 fis = new FileInputStream(file);
  84                 byte[] bytes = new byte[fis.available()];
  85                 int read = fis.read(bytes);
  86                 if (read != bytes.length) {
  87                     return null;
  88                 }
  89                 if (preprocessors != null) {
  90                     for (ClassFilePreprocessor cfp : preprocessors) {
  91                         bytes = cfp.preprocess(name, bytes);
  92                     }
  93                  }
  94                 return defineClass(name, bytes, 0, bytes.length);
  95             } finally {
  96                 fis.close();
  97             }
  98         } catch (IOException e) {}
  99         return null;
 100     }
 101 }