1 /*
   2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.  Oracle designates this
   7  * particular file as subject to the "Classpath" exception as provided
   8  * by Oracle in the LICENSE file that accompanied this code.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  */
  24 
  25 /*
  26  * This file is available under and governed by the GNU General Public
  27  * License version 2 only, as published by the Free Software Foundation.
  28  * However, the following notice accompanied the original version of this
  29  * file:
  30  *
  31  * ASM: a very small and fast Java bytecode manipulation framework
  32  * Copyright (c) 2000-2011 INRIA, France Telecom
  33  * All rights reserved.
  34  *
  35  * Redistribution and use in source and binary forms, with or without
  36  * modification, are permitted provided that the following conditions
  37  * are met:
  38  * 1. Redistributions of source code must retain the above copyright
  39  *    notice, this list of conditions and the following disclaimer.
  40  * 2. Redistributions in binary form must reproduce the above copyright
  41  *    notice, this list of conditions and the following disclaimer in the
  42  *    documentation and/or other materials provided with the distribution.
  43  * 3. Neither the name of the copyright holders nor the names of its
  44  *    contributors may be used to endorse or promote products derived from
  45  *    this software without specific prior written permission.
  46  *
  47  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  48  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  49  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  50  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  51  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  52  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  53  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  54  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  55  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  56  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  57  * THE POSSIBILITY OF SUCH DAMAGE.
  58  */
  59 package jdk.internal.org.objectweb.asm.util;
  60 
  61 import jdk.internal.org.objectweb.asm.AnnotationVisitor;
  62 import jdk.internal.org.objectweb.asm.Attribute;
  63 import jdk.internal.org.objectweb.asm.FieldVisitor;
  64 import jdk.internal.org.objectweb.asm.Opcodes;
  65 
  66 /**
  67  * A {@link FieldVisitor} that checks that its methods are properly used.
  68  */
  69 public class CheckFieldAdapter extends FieldVisitor {
  70 
  71     private boolean end;
  72 
  73     /**
  74      * Constructs a new {@link CheckFieldAdapter}. <i>Subclasses must not use
  75      * this constructor</i>. Instead, they must use the
  76      * {@link #CheckFieldAdapter(int, FieldVisitor)} version.
  77      *
  78      * @param fv the field visitor to which this adapter must delegate calls.
  79      */
  80     public CheckFieldAdapter(final FieldVisitor fv) {
  81         this(Opcodes.ASM4, fv);
  82     }
  83 
  84     /**
  85      * Constructs a new {@link CheckFieldAdapter}.
  86      *
  87      * @param api the ASM API version implemented by this visitor. Must be one
  88      *        of {@link Opcodes#ASM4}.
  89      * @param fv the field visitor to which this adapter must delegate calls.
  90      */
  91     protected CheckFieldAdapter(final int api, final FieldVisitor fv) {
  92         super(api, fv);
  93     }
  94 
  95     @Override
  96     public AnnotationVisitor visitAnnotation(
  97         final String desc,
  98         final boolean visible)
  99     {
 100         checkEnd();
 101         CheckMethodAdapter.checkDesc(desc, false);
 102         return new CheckAnnotationAdapter(super.visitAnnotation(desc, visible));
 103     }
 104 
 105     @Override
 106     public void visitAttribute(final Attribute attr) {
 107         checkEnd();
 108         if (attr == null) {
 109             throw new IllegalArgumentException("Invalid attribute (must not be null)");
 110         }
 111         super.visitAttribute(attr);
 112     }
 113 
 114     @Override
 115     public void visitEnd() {
 116         checkEnd();
 117         end = true;
 118         super.visitEnd();
 119     }
 120 
 121     private void checkEnd() {
 122         if (end) {
 123             throw new IllegalStateException("Cannot call a visit method after visitEnd has been called");
 124         }
 125     }
 126 }