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 import com.sun.org.apache.bcel.internal.ExceptionConst; 25 26 /** 27 * INSTANCEOF - Determine if object is of given type 28 * <PRE>Stack: ..., objectref -> ..., result</PRE> 29 * 30 * @version $Id: INSTANCEOF.java 1747278 2016-06-07 17:28:43Z britter $ 31 */ 32 public class INSTANCEOF extends CPInstruction implements LoadClass, ExceptionThrower, 33 StackProducer, StackConsumer { 34 35 /** 36 * Empty constructor needed for the Class.newInstance() statement in 37 * Instruction.readInstruction(). Not to be used otherwise. 38 */ 39 INSTANCEOF() { 40 } 41 42 43 public INSTANCEOF(final int index) { 44 super(com.sun.org.apache.bcel.internal.Const.INSTANCEOF, index); 45 } 46 47 48 @Override 49 public Class<?>[] getExceptions() { 50 return ExceptionConst.createExceptions(ExceptionConst.EXCS.EXCS_CLASS_AND_INTERFACE_RESOLUTION); 51 } 52 53 54 @Override 55 public ObjectType getLoadClassType( final ConstantPoolGen cpg ) { 56 Type t = getType(cpg); 57 if (t instanceof ArrayType) { 58 t = ((ArrayType) t).getBasicType(); 59 } 60 return (t instanceof ObjectType) ? (ObjectType) t : null; 61 } 62 63 64 /** 65 * Call corresponding visitor method(s). The order is: 66 * Call visitor methods of implemented interfaces first, then 67 * call methods according to the class hierarchy in descending order, 68 * i.e., the most specific visitXXX() call comes last. 69 * 70 * @param v Visitor object 71 */ 72 @Override 73 public void accept( final Visitor v ) { 74 v.visitLoadClass(this); 75 v.visitExceptionThrower(this); 76 v.visitStackProducer(this); 77 v.visitStackConsumer(this); 78 v.visitTypedInstruction(this); 79 v.visitCPInstruction(this); 80 v.visitINSTANCEOF(this); 81 } 82 }