ByteCodeClassLoader.java revision 12158:0fe2815ffa74 
1/*
2 * Copyright (c) 2016, 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 selectionresolution;
25
26import java.util.ArrayList;
27import java.util.Arrays;
28import java.util.HashMap;
29
30
31public class ByteCodeClassLoader extends ClassLoader {
32    ArrayList<ClassConstruct> classes = new ArrayList<>();
33    HashMap<String, Class> loadedClasses = new HashMap<>();
34
35    public void addClasses(ClassConstruct... classes) {
36        this.classes.addAll(Arrays.asList(classes));
37    }
38
39    public void loadAll() throws ClassNotFoundException {
40        for (ClassConstruct clazz : classes) {
41            findClass(clazz.getDottedName());
42        }
43    }
44
45
46    @Override
47    public Class findClass(String name) throws ClassNotFoundException {
48
49        Class cls = loadedClasses.get(name);
50
51        if (cls != null) {
52            return cls;
53        }
54
55        for (ClassConstruct clazz : classes) {
56            if (clazz.getDottedName().equals(name)) {
57                return load(clazz);
58            }
59        }
60
61        throw new ClassNotFoundException(name);
62    }
63
64    @Override
65    public Class loadClass(String name) throws ClassNotFoundException {
66        try {
67            return findClass(name);
68        } catch (ClassNotFoundException e) {
69            return super.loadClass(name);
70        }
71    }
72
73    private Class load(ClassConstruct clazz) {
74        byte[] bytecode = clazz.generateBytes();
75        Class loadedClass = defineClass(clazz.getDottedName(), bytecode, 0, bytecode.length);
76        loadedClasses.put(clazz.getDottedName(), loadedClass);
77        return loadedClass;
78    }
79}
80