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 
  26 package jdk.nashorn.internal.tools.nasgen;
  27 
  28 import jdk.internal.org.objectweb.asm.AnnotationVisitor;
  29 import jdk.internal.org.objectweb.asm.ClassVisitor;
  30 import jdk.internal.org.objectweb.asm.FieldVisitor;
  31 import jdk.internal.org.objectweb.asm.MethodVisitor;
  32 
  33 /**
  34  * A visitor that does nothing on visitXXX calls.
  35  *
  36  */
  37 public 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 }