NullVisitor.java revision 6:5a1b0714df0e 
1/*
2 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package jdk.nashorn.internal.tools.nasgen;
27
28import jdk.internal.org.objectweb.asm.AnnotationVisitor;
29import jdk.internal.org.objectweb.asm.ClassVisitor;
30import jdk.internal.org.objectweb.asm.FieldVisitor;
31import jdk.internal.org.objectweb.asm.MethodVisitor;
32import jdk.internal.org.objectweb.asm.Opcodes;
33
34/**
35 * A visitor that does nothing on visitXXX calls.
36 *
37 */
38public class NullVisitor extends ClassVisitor {
39    NullVisitor() {
40        super(Opcodes.ASM4);
41    }
42
43    @Override
44    public MethodVisitor visitMethod(
45        final int access,
46        final String name,
47        final String desc,
48        final String signature,
49        final String[] exceptions) {
50        return new MethodVisitor(Opcodes.ASM4) {
51            @Override
52            public AnnotationVisitor visitAnnotationDefault() {
53                return new NullAnnotationVisitor();
54            }
55
56            @Override
57            public AnnotationVisitor visitAnnotation(final String descriptor, final boolean visible) {
58                return new NullAnnotationVisitor();
59            }
60        };
61    }
62
63    @Override
64    public FieldVisitor visitField(
65        final int access,
66        final String name,
67        final String desc,
68        final String signature,
69        final Object value) {
70        return new FieldVisitor(Opcodes.ASM4) {
71            @Override
72            public AnnotationVisitor visitAnnotation(final String descriptor, final boolean visible) {
73                return new NullAnnotationVisitor();
74            }
75        };
76    }
77
78    @Override
79    public AnnotationVisitor visitAnnotation(final String desc, final boolean visible) {
80        return new NullAnnotationVisitor();
81    }
82
83    private static class NullAnnotationVisitor extends AnnotationVisitor {
84        NullAnnotationVisitor() {
85            super(Opcodes.ASM4);
86        }
87    }
88}
89