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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 import org.apache.bcel.ExceptionConstants; 57 /*** 58 * CHECKCAST - Check whether object is of given type 59 * <PRE>Stack: ..., objectref -> ..., objectref</PRE> 60 * 61 * @version $Id: CHECKCAST.java,v 1.1.1.1 2001/10/29 20:00:07 jvanzyl Exp $ 62 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> 63 */ 64 public class CHECKCAST 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 CHECKCAST() {} 71 72 /*** Check whether object is of given type 73 * @param n index to class in constant pool 74 */ 75 public CHECKCAST(int index) { 76 super(org.apache.bcel.Constants.CHECKCAST, index); 77 } 78 79 /*** @return exceptions this instruction may cause 80 */ 81 public Class[] getExceptions() { 82 Class[] cs = new Class[1 + ExceptionConstants.EXCS_CLASS_AND_INTERFACE_RESOLUTION.length]; 83 84 System.arraycopy(ExceptionConstants.EXCS_CLASS_AND_INTERFACE_RESOLUTION, 0, 85 cs, 0, ExceptionConstants.EXCS_CLASS_AND_INTERFACE_RESOLUTION.length); 86 cs[ExceptionConstants.EXCS_CLASS_AND_INTERFACE_RESOLUTION.length] = 87 ExceptionConstants.CLASS_CAST_EXCEPTION; 88 return cs; 89 } 90 91 public ObjectType getLoadClassType(ConstantPoolGen cpg) { 92 Type t = getType(cpg); 93 94 if(t instanceof ArrayType) 95 t = ((ArrayType) t).getBasicType(); 96 97 return (t instanceof ObjectType)? (ObjectType) t : null; 98 } 99 100 /*** 101 * Call corresponding visitor method(s). The order is: 102 * Call visitor methods of implemented interfaces first, then 103 * call methods according to the class hierarchy in descending order, 104 * i.e., the most specific visitXXX() call comes last. 105 * 106 * @param v Visitor object 107 */ 108 public void accept(Visitor v) { 109 v.visitLoadClass(this); 110 v.visitExceptionThrower(this); 111 v.visitStackProducer(this); 112 v.visitStackConsumer(this); 113 v.visitTypedInstruction(this); 114 v.visitCPInstruction(this); 115 v.visitCHECKCAST(this); 116 } 117 }

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