1 /*
2 * The Apache Software License, Version 1.1
3 *
4 * Copyright (c) 2002 The Apache Software Foundation. All rights
5 * reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * 3. The end-user documentation included with the redistribution,
20 * if any, must include the following acknowledgment:
21 * "This product includes software developed by the
22 * Apache Software Foundation (http://www.apache.org/)."
23 * Alternately, this acknowledgment may appear in the software itself,
24 * if and wherever such third-party acknowledgments normally appear.
25 *
26 * 4. The names "Apache" and "Apache Software Foundation" must
27 * not be used to endorse or promote products derived from this
28 * software without prior written permission. For written
29 * permission, please contact apache@apache.org.
30 *
31 * 5. Products derived from this software may not be called "Apache",
32 * nor may "Apache" appear in their name, without prior written
33 * permission of the Apache Software Foundation.
34 *
35 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
36 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
37 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
38 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
42 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
43 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
44 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
45 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46 * SUCH DAMAGE.
47 * ====================================================================
48 *
49 * This software consists of voluntary contributions made by many
50 * individuals on behalf of the Apache Software Foundation. For more
51 * information on the Apache Software Foundation, please see
52 * <http://www.apache.org/>;.
53 */
54 package net.sf.cglib.proxy;
55
56 import java.lang.reflect.Method;
57 import java.lang.reflect.Modifier;
58 import java.util.*;
59 import net.sf.cglib.core.*;
60 import org.objectweb.asm.Label;
61 import org.objectweb.asm.Type;
62
63 class LazyLoaderGenerator implements CallbackGenerator {
64 public static final LazyLoaderGenerator INSTANCE = new LazyLoaderGenerator();
65
66 private static final Signature LOAD_OBJECT =
67 TypeUtils.parseSignature("Object loadObject()");
68 private static final Type LAZY_LOADER =
69 TypeUtils.parseType("net.sf.cglib.proxy.LazyLoader");
70
71 public void generate(ClassEmitter ce, final Context context) {
72 Set indexes = new HashSet();
73 for (Iterator it = context.getMethods(); it.hasNext();) {
74 Method method = (Method)it.next();
75 if (Modifier.isProtected(method.getModifiers())) {
76 // ignore protected methods
77 } else {
78 int index = context.getIndex(method);
79 indexes.add(new Integer(index));
80 CodeEmitter e = ce.begin_method(context.getModifiers(method),
81 ReflectUtils.getSignature(method),
82 ReflectUtils.getExceptionTypes(method),
83 null);
84 e.load_this();
85 e.dup();
86 e.invoke_virtual_this(loadMethod(index));
87 e.checkcast(Type.getType(method.getDeclaringClass()));
88 e.load_args();
89 e.invoke(method);
90 e.return_value();
91 e.end_method();
92 }
93 }
94
95 for (Iterator it = indexes.iterator(); it.hasNext();) {
96 int index = ((Integer)it.next()).intValue();
97
98 String delegate = "CGLIB$LAZY_LOADER_" + index;
99 ce.declare_field(Constants.ACC_PRIVATE, delegate, Constants.TYPE_OBJECT, null, null);
100
101 CodeEmitter e = ce.begin_method(Constants.ACC_PRIVATE |
102 Constants.ACC_SYNCHRONIZED |
103 Constants.ACC_FINAL,
104 loadMethod(index),
105 null,
106 null);
107 e.load_this();
108 e.getfield(delegate);
109 e.dup();
110 Label end = e.make_label();
111 e.ifnonnull(end);
112 e.pop();
113 e.load_this();
114 context.emitCallback(e, index);
115 e.invoke_interface(LAZY_LOADER, LOAD_OBJECT);
116 e.dup_x1();
117 e.putfield(delegate);
118 e.mark(end);
119 e.return_value();
120 e.end_method();
121
122 }
123 }
124
125 private Signature loadMethod(int index) {
126 return new Signature("CGLIB$LOAD_PRIVATE_" + index,
127 Constants.TYPE_OBJECT,
128 Constants.TYPES_EMPTY);
129 }
130
131 public void generateStatic(CodeEmitter e, Context context) { }
132 }
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