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  * Super class for instructions dealing with array access such as IALOAD.
24  *
25  * @version $Id$
26  */
27 public abstract class ArrayInstruction extends Instruction implements ExceptionThrower,
28         TypedInstruction {
29 
30     /**
31      * Empty constructor needed for Instruction.readInstruction.
32      * Not to be used otherwise.
33      */
ArrayInstruction()34     ArrayInstruction() {
35     }
36 
37 
38     /**
39      * @param opcode of instruction
40      */
ArrayInstruction(final short opcode)41     protected ArrayInstruction(final short opcode) {
42         super(opcode, (short) 1);
43     }
44 
45 
46     @Override
getExceptions()47     public Class<?>[] getExceptions() {
48         return ExceptionConst.createExceptions(ExceptionConst.EXCS.EXCS_ARRAY_EXCEPTION);
49     }
50 
51 
52     /** @return type associated with the instruction
53      */
54     @Override
getType( final ConstantPoolGen cp )55     public Type getType( final ConstantPoolGen cp ) {
56         final short _opcode = super.getOpcode();
57         switch (_opcode) {
58             case org.apache.bcel.Const.IALOAD:
59             case org.apache.bcel.Const.IASTORE:
60                 return Type.INT;
61             case org.apache.bcel.Const.CALOAD:
62             case org.apache.bcel.Const.CASTORE:
63                 return Type.CHAR;
64             case org.apache.bcel.Const.BALOAD:
65             case org.apache.bcel.Const.BASTORE:
66                 return Type.BYTE;
67             case org.apache.bcel.Const.SALOAD:
68             case org.apache.bcel.Const.SASTORE:
69                 return Type.SHORT;
70             case org.apache.bcel.Const.LALOAD:
71             case org.apache.bcel.Const.LASTORE:
72                 return Type.LONG;
73             case org.apache.bcel.Const.DALOAD:
74             case org.apache.bcel.Const.DASTORE:
75                 return Type.DOUBLE;
76             case org.apache.bcel.Const.FALOAD:
77             case org.apache.bcel.Const.FASTORE:
78                 return Type.FLOAT;
79             case org.apache.bcel.Const.AALOAD:
80             case org.apache.bcel.Const.AASTORE:
81                 return Type.OBJECT;
82             default:
83                 throw new ClassGenException("Oops: unknown case in switch" + _opcode);
84         }
85     }
86 }
87