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Java > Open Source Codes > net > sf > cglib > transform > impl > AccessFieldTransformer


1 /*
2  * Copyright 2003 The Apache Software Foundation
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package net.sf.cglib.transform.impl;
17
18 import net.sf.cglib.transform.*;
19 import net.sf.cglib.core.*;
20 import org.objectweb.asm.ClassVisitor;
21 import org.objectweb.asm.MethodVisitor;
22 import org.objectweb.asm.Attribute;
23 import org.objectweb.asm.Type;
24
25 public class AccessFieldTransformer extends ClassEmitterTransformer {
26     private Callback callback;
27
28     public AccessFieldTransformer(Callback callback) {
29         this.callback = callback;
30     }
31
32     public interface Callback {
33         String JavaDoc getPropertyName(Type owner, String JavaDoc fieldName);
34     }
35
36     public void declare_field(int access, final String JavaDoc name, Type type, Object JavaDoc value) {
37         super.declare_field(access, name, type, value);
38
39         String JavaDoc property = TypeUtils.upperFirst(callback.getPropertyName(getClassType(), name));
40         if (property != null) {
41             CodeEmitter e;
42             e = begin_method(Constants.ACC_PUBLIC,
43                              new Signature("get" + property,
44                                            type,
45                                            Constants.TYPES_EMPTY),
46                              null);
47             e.load_this();
48             e.getfield(name);
49             e.return_value();
50             e.end_method();
51
52             e = begin_method(Constants.ACC_PUBLIC,
53                              new Signature("set" + property,
54                                            Type.VOID_TYPE,
55                                            new Type[]{ type }),
56                              null);
57             e.load_this();
58             e.load_arg(0);
59             e.putfield(name);
60             e.return_value();
61             e.end_method();
62         }
63     }
64 }
65
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