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1 package org.apache.bcel.generic; 2 3 /* ==================================================================== 4 * The Apache Software License, Version 1.1 5 * 6 * Copyright (c) 2001 The Apache Software Foundation. All rights 7 * reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. The end-user documentation included with the redistribution, 22 * if any, must include the following acknowledgment: 23 * "This product includes software developed by the 24 * Apache Software Foundation (http://www.apache.org/)." 25 * Alternately, this acknowledgment may appear in the software itself, 26 * if and wherever such third-party acknowledgments normally appear. 27 * 28 * 4. The names "Apache" and "Apache Software Foundation" and 29 * "Apache BCEL" must not be used to endorse or promote products 30 * derived from this software without prior written permission. For 31 * written permission, please contact apache@apache.org. 32 * 33 * 5. Products derived from this software may not be called "Apache", 34 * "Apache BCEL", nor may "Apache" appear in their name, without 35 * prior written permission of the Apache Software Foundation. 36 * 37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 48 * SUCH DAMAGE. 49 * ==================================================================== 50 * 51 * This software consists of voluntary contributions made by many 52 * individuals on behalf of the Apache Software Foundation. For more 53 * information on the Apache Software Foundation, please see 54 * <http://www.apache.org/>;. 55 */ 56 57 /*** 58 * INSTANCEOF - Determine if object is of given type 59 * <PRE>Stack: ..., objectref -> ..., result</PRE> 60 * 61 * @version $Id: INSTANCEOF.java,v 1.1.1.1 2001/10/29 20:00:16 jvanzyl Exp $ 62 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> 63 */ 64 public class INSTANCEOF extends CPInstruction 65 implements LoadClass, ExceptionThrower, StackProducer, StackConsumer { 66 /*** 67 * Empty constructor needed for the Class.newInstance() statement in 68 * Instruction.readInstruction(). Not to be used otherwise. 69 */ 70 INSTANCEOF() {} 71 72 public INSTANCEOF(int index) { 73 super(org.apache.bcel.Constants.INSTANCEOF, index); 74 } 75 76 public Class[] getExceptions() { 77 return org.apache.bcel.ExceptionConstants.EXCS_CLASS_AND_INTERFACE_RESOLUTION; 78 } 79 80 public ObjectType getLoadClassType(ConstantPoolGen cpg) { 81 Type t = getType(cpg); 82 83 if(t instanceof ArrayType) 84 t = ((ArrayType) t).getBasicType(); 85 86 return (t instanceof ObjectType)? (ObjectType) t : null; 87 } 88 89 /*** 90 * Call corresponding visitor method(s). The order is: 91 * Call visitor methods of implemented interfaces first, then 92 * call methods according to the class hierarchy in descending order, 93 * i.e., the most specific visitXXX() call comes last. 94 * 95 * @param v Visitor object 96 */ 97 public void accept(Visitor v) { 98 v.visitLoadClass(this); 99 v.visitExceptionThrower(this); 100 v.visitStackProducer(this); 101 v.visitStackConsumer(this); 102 v.visitTypedInstruction(this); 103 v.visitCPInstruction(this); 104 v.visitINSTANCEOF(this); 105 } 106 }

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