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 org.objectweb.asm.Type;
57
58 class CallbackUtils {
59 private CallbackUtils() { }
60
61 static Class determineType(Callback callback) {
62 Class test = typeHelper(callback, null, NoOp.class);
63 test = typeHelper(callback, test, MethodInterceptor.class);
64 test = typeHelper(callback, test, InvocationHandler.class);
65 test = typeHelper(callback, test, LazyLoader.class);
66 test = typeHelper(callback, test, Dispatcher.class);
67 test = typeHelper(callback, test, FixedValue.class);
68 if (test == null) {
69 throw new IllegalStateException("Unknown callback " + callback.getClass());
70 }
71 return test;
72 }
73
74 private static Class typeHelper(Callback callback, Class cur, Class callbackType) {
75 if (callback == null) {
76 throw new IllegalStateException("Callback is null");
77 }
78 if (callbackType.isAssignableFrom(callback.getClass())) {
79 if (cur != null) {
80 throw new IllegalStateException("Callback implements both " + cur + " and " + callbackType + "; use setCallbackTypes to distinguish");
81 }
82 return callbackType;
83 } else {
84 return cur;
85 }
86 }
87
88 static CallbackGenerator getGenerator(Class type) {
89 if (type.equals(NoOp.class)) {
90 return NoOpGenerator.INSTANCE;
91 } else if (type.equals(MethodInterceptor.class)) {
92 return MethodInterceptorGenerator.INSTANCE;
93 } else if (type.equals(InvocationHandler.class)) {
94 return InvocationHandlerGenerator.INSTANCE;
95 } else if (type.equals(LazyLoader.class)) {
96 return LazyLoaderGenerator.INSTANCE;
97 } else if (type.equals(Dispatcher.class)) {
98 return DispatcherGenerator.INSTANCE;
99 } else if (type.equals(FixedValue.class)) {
100 return FixedValueGenerator.INSTANCE;
101 } else {
102 throw new IllegalStateException("Unknown callback " + type);
103 }
104 }
105 }
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