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 }