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