01: /***
02: * ASM Guide
03: * Copyright (c) 2007 Eric Bruneton
04: * All rights reserved.
05: *
06: * Redistribution and use in source and binary forms, with or without
07: * modification, are permitted provided that the following conditions
08: * are met:
09: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: * 2. Redistributions in binary form must reproduce the above copyright
12: * notice, this list of conditions and the following disclaimer in the
13: * documentation and/or other materials provided with the distribution.
14: * 3. Neither the name of the copyright holders nor the names of its
15: * contributors may be used to endorse or promote products derived from
16: * this software without specific prior written permission.
17: *
18: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19: * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21: * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
22: * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
28: * THE POSSIBILITY OF SUCH DAMAGE.
29: */package ch5.sec1;
30:
31: import java.util.List;
32:
33: import org.objectweb.asm.tree.ClassNode;
34: import org.objectweb.asm.tree.FieldNode;
35:
36: /**
37: * ASM Guide example class.
38: *
39: * @author Eric Bruneton
40: */
41: public class AddFieldTransformer extends ClassTransformer {
42:
43: private int fieldAccess;
44:
45: private String fieldName;
46:
47: private String fieldDesc;
48:
49: public AddFieldTransformer(ClassTransformer ct, int fieldAccess,
50: String fieldName, String fieldDesc) {
51: super (ct);
52: this .fieldAccess = fieldAccess;
53: this .fieldName = fieldName;
54: this .fieldDesc = fieldDesc;
55: }
56:
57: public void transform(ClassNode cn) {
58: boolean isPresent = false;
59: for (FieldNode fn : (List<FieldNode>) cn.fields) {
60: if (fieldName.equals(fn.name)) {
61: isPresent = true;
62: break;
63: }
64: }
65: if (!isPresent) {
66: cn.fields.add(new FieldNode(fieldAccess, fieldName,
67: fieldDesc, null, null));
68: }
69: super.transform(cn);
70: }
71: }
|