1 /*
   2  * Copyright (c) 2014, 2015, 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 jdk.jshell.execution;
  27 
  28 import java.net.URL;
  29 import java.net.URLClassLoader;
  30 import java.security.CodeSource;
  31 import java.util.Map;
  32 import java.util.TreeMap;
  33 
  34 /**
  35  * Class loader wrapper which caches class files by name until requested.
  36  *
  37  * @author Robert Field
  38  */
  39 class RemoteClassLoader extends URLClassLoader {
  40 
  41     private final Map<String, byte[]> classObjects = new TreeMap<>();
  42 
  43     RemoteClassLoader() {
  44         super(new URL[0]);
  45     }
  46 
  47     void delare(String name, byte[] bytes) {
  48         classObjects.put(name, bytes);
  49     }
  50 
  51     @Override
  52     protected Class<?> findClass(String name) throws ClassNotFoundException {
  53         byte[] b = classObjects.get(name);
  54         if (b == null) {
  55             return super.findClass(name);
  56         }
  57         return super.defineClass(name, b, 0, b.length, (CodeSource) null);
  58     }
  59 
  60     @Override
  61     public void addURL(URL url) {
  62         super.addURL(url);
  63     }
  64 
  65 }