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 -&gt; ..., 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 }