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Java > Open Source Codes > org > apache > bcel > generic > ArrayInstruction


1 /*
2  * Copyright 2000-2004 The Apache Software Foundation
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  *
16  */
17 package org.apache.bcel.generic;
18
19 /**
20  * Super class for instructions dealing with array access such as IALOAD.
21  *
22  * @version $Id: ArrayInstruction.java 386056 2006-03-15 11:31:56Z tcurdt $
23  * @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
24  */
25 public abstract class ArrayInstruction extends Instruction implements ExceptionThrower,
26         TypedInstruction {
27
28     /**
29      * Empty constructor needed for the Class.newInstance() statement in
30      * Instruction.readInstruction(). Not to be used otherwise.
31      */
32     ArrayInstruction() {
33     }
34
35
36     /**
37      * @param opcode of instruction
38      */
39     protected ArrayInstruction(short opcode) {
40         super(opcode, (short) 1);
41     }
42
43
44     public Class JavaDoc[] getExceptions() {
45         return org.apache.bcel.ExceptionConstants.EXCS_ARRAY_EXCEPTION;
46     }
47
48
49     /** @return type associated with the instruction
50      */
51     public Type getType( ConstantPoolGen cp ) {
52         switch (opcode) {
53             case org.apache.bcel.Constants.IALOAD:
54             case org.apache.bcel.Constants.IASTORE:
55                 return Type.INT;
56             case org.apache.bcel.Constants.CALOAD:
57             case org.apache.bcel.Constants.CASTORE:
58                 return Type.CHAR;
59             case org.apache.bcel.Constants.BALOAD:
60             case org.apache.bcel.Constants.BASTORE:
61                 return Type.BYTE;
62             case org.apache.bcel.Constants.SALOAD:
63             case org.apache.bcel.Constants.SASTORE:
64                 return Type.SHORT;
65             case org.apache.bcel.Constants.LALOAD:
66             case org.apache.bcel.Constants.LASTORE:
67                 return Type.LONG;
68             case org.apache.bcel.Constants.DALOAD:
69             case org.apache.bcel.Constants.DASTORE:
70                 return Type.DOUBLE;
71             case org.apache.bcel.Constants.FALOAD:
72             case org.apache.bcel.Constants.FASTORE:
73                 return Type.FLOAT;
74             case org.apache.bcel.Constants.AALOAD:
75             case org.apache.bcel.Constants.AASTORE:
76                 return Type.OBJECT;
77             default:
78                 throw new ClassGenException("Oops: unknown case in switch" + opcode);
79         }
80     }
81 }
82
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