1 /*
   2  * Copyright (c) 2010, 2013, 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.nashorn.internal.runtime;
  27 
  28 import java.security.CodeSource;
  29 import java.util.Objects;
  30 
  31 /**
  32  * Responsible for loading script generated classes.
  33  *
  34  */
  35 final class ScriptLoader extends NashornLoader {
  36     private static final String NASHORN_PKG_PREFIX = "jdk.nashorn.internal.";
  37 
  38     private final Context context;
  39 
  40     /*package-private*/ Context getContext() {
  41         return context;
  42     }
  43 
  44     /**
  45      * Constructor.
  46      */
  47     ScriptLoader(final ClassLoader parent, final Context context) {
  48         super(parent);
  49         this.context = context;
  50     }
  51 
  52     @Override
  53     protected Class<?> loadClass(final String name, final boolean resolve) throws ClassNotFoundException {
  54         checkPackageAccess(name);
  55         if (name.startsWith(NASHORN_PKG_PREFIX)) {
  56             return context.getSharedLoader().loadClass(name);
  57         }
  58         return super.loadClass(name, resolve);
  59     }
  60 
  61     // package-private and private stuff below this point
  62 
  63     /**
  64      * Install a class for use by the Nashorn runtime
  65      *
  66      * @param name Binary name of class.
  67      * @param data Class data bytes.
  68      * @param cs CodeSource code source of the class bytes.
  69      *
  70      * @return Installed class.
  71      */
  72     synchronized Class<?> installClass(final String name, final byte[] data, final CodeSource cs) {
  73         Objects.requireNonNull(cs);
  74         return defineClass(name, data, 0, data.length, cs);
  75     }
  76 }