1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 */ 18 package org.apache.bcel.generic; 19 20 import org.apache.bcel.ExceptionConst; 21 22 /** 23 * INSTANCEOF - Determine if object is of given type 24 * <PRE>Stack: ..., objectref -> ..., result</PRE> 25 * 26 * @version $Id$ 27 */ 28 public class INSTANCEOF extends CPInstruction implements LoadClass, ExceptionThrower, 29 StackProducer, StackConsumer { 30 31 /** 32 * Empty constructor needed for Instruction.readInstruction. 33 * Not to be used otherwise. 34 */ 35 INSTANCEOF() { 36 } 37 38 39 public INSTANCEOF(final int index) { 40 super(org.apache.bcel.Const.INSTANCEOF, index); 41 } 42 43 44 @Override 45 public Class<?>[] getExceptions() { 46 return ExceptionConst.createExceptions(ExceptionConst.EXCS.EXCS_CLASS_AND_INTERFACE_RESOLUTION); 47 } 48 49 50 @Override 51 public ObjectType getLoadClassType( final ConstantPoolGen cpg ) { 52 Type t = getType(cpg); 53 if (t instanceof ArrayType) { 54 t = ((ArrayType) t).getBasicType(); 55 } 56 return (t instanceof ObjectType) ? (ObjectType) t : null; 57 } 58 59 60 /** 61 * Call corresponding visitor method(s). The order is: 62 * Call visitor methods of implemented interfaces first, then 63 * call methods according to the class hierarchy in descending order, 64 * i.e., the most specific visitXXX() call comes last. 65 * 66 * @param v Visitor object 67 */ 68 @Override 69 public void accept( final Visitor v ) { 70 v.visitLoadClass(this); 71 v.visitExceptionThrower(this); 72 v.visitStackProducer(this); 73 v.visitStackConsumer(this); 74 v.visitTypedInstruction(this); 75 v.visitCPInstruction(this); 76 v.visitINSTANCEOF(this); 77 } 78 } 79
