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


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 import org.apache.bcel.Constants;
20
21 /**
22  * Super class for the x2y family of instructions.
23  *
24  * @version $Id: ConversionInstruction.java 386056 2006-03-15 11:31:56Z tcurdt $
25  * @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
26  */
27 public abstract class ConversionInstruction extends Instruction implements TypedInstruction,
28         StackProducer, StackConsumer {
29
30     /**
31      * Empty constructor needed for the Class.newInstance() statement in
32      * Instruction.readInstruction(). Not to be used otherwise.
33      */
34     ConversionInstruction() {
35     }
36
37
38     /**
39      * @param opcode opcode of instruction
40      */
41     protected ConversionInstruction(short opcode) {
42         super(opcode, (short) 1);
43     }
44
45
46     /** @return type associated with the instruction
47      */
48     public Type getType( ConstantPoolGen cp ) {
49         switch (opcode) {
50             case Constants.D2I:
51             case Constants.F2I:
52             case Constants.L2I:
53                 return Type.INT;
54             case Constants.D2F:
55             case Constants.I2F:
56             case Constants.L2F:
57                 return Type.FLOAT;
58             case Constants.D2L:
59             case Constants.F2L:
60             case Constants.I2L:
61                 return Type.LONG;
62             case Constants.F2D:
63             case Constants.I2D:
64             case Constants.L2D:
65                 return Type.DOUBLE;
66             case Constants.I2B:
67                 return Type.BYTE;
68             case Constants.I2C:
69                 return Type.CHAR;
70             case Constants.I2S:
71                 return Type.SHORT;
72             default: // Never reached
73 throw new ClassGenException("Unknown type " + opcode);
74         }
75     }
76 }
77
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