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Java > Open Source Codes > org > objectweb > asm > util > CheckFieldAdapter


1 /***
2  * ASM: a very small and fast Java bytecode manipulation framework
3  * Copyright (c) 2000-2005 INRIA, France Telecom
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 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  */
30 package org.objectweb.asm.util;
31
32 import org.objectweb.asm.AnnotationVisitor;
33 import org.objectweb.asm.Attribute;
34 import org.objectweb.asm.FieldVisitor;
35
36 /**
37  * A {@link FieldVisitor} that checks that its methods are properly used.
38  */
39 public class CheckFieldAdapter implements FieldVisitor {
40
41     private FieldVisitor fv;
42
43     private boolean end;
44
45     public CheckFieldAdapter(final FieldVisitor fv) {
46         this.fv = fv;
47     }
48
49     public AnnotationVisitor visitAnnotation(
50         final String JavaDoc desc,
51         final boolean visible)
52     {
53         checkEnd();
54         CheckMethodAdapter.checkDesc(desc, false);
55         return new CheckAnnotationAdapter(fv.visitAnnotation(desc, visible));
56     }
57
58     public void visitAttribute(final Attribute attr) {
59         checkEnd();
60         if (attr == null) {
61             throw new IllegalArgumentException JavaDoc("Invalid attribute (must not be null)");
62         }
63         fv.visitAttribute(attr);
64     }
65
66     public void visitEnd() {
67         checkEnd();
68         end = true;
69         fv.visitEnd();
70     }
71
72     private void checkEnd() {
73         if (end) {
74             throw new IllegalStateException JavaDoc("Cannot call a visit method after visitEnd has been called");
75         }
76     }
77 }
78
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