| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.sun.org.apache.bcel.internal.generic; |
| |
| import com.sun.org.apache.bcel.internal.ExceptionConst; |
| |
| /** |
| * CHECKCAST - Check whether object is of given type |
| * <PRE>Stack: ..., objectref -> ..., objectref</PRE> |
| * |
| */ |
| public class CHECKCAST extends CPInstruction implements LoadClass, ExceptionThrower, StackProducer, |
| StackConsumer { |
| |
| /** |
| * Empty constructor needed for Instruction.readInstruction. |
| * Not to be used otherwise. |
| */ |
| CHECKCAST() { |
| } |
| |
| |
| /** Check whether object is of given type |
| * @param index index to class in constant pool |
| */ |
| public CHECKCAST(final int index) { |
| super(com.sun.org.apache.bcel.internal.Const.CHECKCAST, index); |
| } |
| |
| |
| /** @return exceptions this instruction may cause |
| */ |
| @Override |
| public Class<?>[] getExceptions() { |
| return ExceptionConst.createExceptions(ExceptionConst.EXCS.EXCS_CLASS_AND_INTERFACE_RESOLUTION, |
| ExceptionConst.CLASS_CAST_EXCEPTION); |
| } |
| |
| |
| @Override |
| public ObjectType getLoadClassType( final ConstantPoolGen cpg ) { |
| Type t = getType(cpg); |
| if (t instanceof ArrayType) { |
| t = ((ArrayType) t).getBasicType(); |
| } |
| return (t instanceof ObjectType) ? (ObjectType) t : null; |
| } |
| |
| |
| /** |
| * Call corresponding visitor method(s). The order is: |
| * Call visitor methods of implemented interfaces first, then |
| * call methods according to the class hierarchy in descending order, |
| * i.e., the most specific visitXXX() call comes last. |
| * |
| * @param v Visitor object |
| */ |
| @Override |
| public void accept( final Visitor v ) { |
| v.visitLoadClass(this); |
| v.visitExceptionThrower(this); |
| v.visitStackProducer(this); |
| v.visitStackConsumer(this); |
| v.visitTypedInstruction(this); |
| v.visitCPInstruction(this); |
| v.visitCHECKCAST(this); |
| } |
| } |