1/*
2 * Copyright (c) 2005, 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
24package evalexpr;
25
26import java.util.Map;
27
28/**
29 * A class loader which loads classes from byte arrays.
30 *
31 * <p><b>This is NOT part of any supported API.
32 * If you write code that depends on this, you do so at your own
33 * risk.  This code and its internal interfaces are subject to change
34 * or deletion without notice.</b></p>
35 * @author Peter von der Ah&eacute;
36 */
37public class ByteArrayClassLoader extends ClassLoader {
38    /**
39     * Maps binary class names to class files stored as byte arrays.
40     */
41    private Map<String, byte[]> classes;
42
43    /**
44     * Creates a new instance of ByteArrayClassLoader
45     * @param classes a map from binary class names to class files stored as byte arrays
46     */
47    public ByteArrayClassLoader(Map<String, byte[]> classes) {
48        this.classes = classes;
49    }
50
51    @Override
52    public Class<?> loadClass(String name) throws ClassNotFoundException {
53        try {
54            return super.loadClass(name);
55        } catch (ClassNotFoundException e) {
56            byte[] classData = classes.get(name);
57            return defineClass(name, classData, 0, classData.length);
58        }
59    }
60}
61