NullVisitor.java revision 973:d564abed1e6a 
1235537Sgber/*
2235537Sgber * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
3235537Sgber * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4235537Sgber *
5235537Sgber * This code is free software; you can redistribute it and/or modify it
6235537Sgber * under the terms of the GNU General Public License version 2 only, as
7235537Sgber * published by the Free Software Foundation.  Oracle designates this
8235537Sgber * 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;
32
33/**
34 * A visitor that does nothing on visitXXX calls.
35 *
36 */
37public class NullVisitor extends ClassVisitor {
38    NullVisitor() {
39        super(Main.ASM_VERSION);
40    }
41
42    @Override
43    public MethodVisitor visitMethod(
44        final int access,
45        final String name,
46        final String desc,
47        final String signature,
48        final String[] exceptions) {
49        return new MethodVisitor(Main.ASM_VERSION) {
50            @Override
51            public AnnotationVisitor visitAnnotationDefault() {
52                return new NullAnnotationVisitor();
53            }
54
55            @Override
56            public AnnotationVisitor visitAnnotation(final String descriptor, final boolean visible) {
57                return new NullAnnotationVisitor();
58            }
59        };
60    }
61
62    @Override
63    public FieldVisitor visitField(
64        final int access,
65        final String name,
66        final String desc,
67        final String signature,
68        final Object value) {
69        return new FieldVisitor(Main.ASM_VERSION) {
70            @Override
71            public AnnotationVisitor visitAnnotation(final String descriptor, final boolean visible) {
72                return new NullAnnotationVisitor();
73            }
74        };
75    }
76
77    @Override
78    public AnnotationVisitor visitAnnotation(final String desc, final boolean visible) {
79        return new NullAnnotationVisitor();
80    }
81
82    private static class NullAnnotationVisitor extends AnnotationVisitor {
83        NullAnnotationVisitor() {
84            super(Main.ASM_VERSION);
85        }
86    }
87}
88