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 ch2.sec2;
30:
31: import org.objectweb.asm.ClassAdapter;
32: import org.objectweb.asm.ClassVisitor;
33: import org.objectweb.asm.FieldVisitor;
34:
35: /**
36: * ASM Guide example class.
37: *
38: * @author Eric Bruneton
39: */
40: public class AddFieldAdapter extends ClassAdapter {
41:
42: private int fAcc;
43:
44: private String fName;
45:
46: private String fDesc;
47:
48: private boolean isFieldPresent;
49:
50: public AddFieldAdapter(ClassVisitor cv, int fAcc, String fName,
51: String fDesc) {
52: super (cv);
53: this .fAcc = fAcc;
54: this .fName = fName;
55: this .fDesc = fDesc;
56: }
57:
58: @Override
59: public FieldVisitor visitField(int access, String name,
60: String desc, String signature, Object value) {
61: if (name.equals(fName)) {
62: isFieldPresent = true;
63: }
64: return cv.visitField(access, name, desc, signature, value);
65: }
66:
67: @Override
68: public void visitEnd() {
69: if (!isFieldPresent) {
70: FieldVisitor fv = cv.visitField(fAcc, fName, fDesc, null,
71: null);
72: if (fv != null) {
73: fv.visitEnd();
74: }
75: }
76: cv.visitEnd();
77: }
78: }
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