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


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  * DCONST - Push 0.0 or 1.0, other values cause an exception
21  *
22  * <PRE>Stack: ... -&gt; ..., </PRE>
23  *
24  * @version $Id: DCONST.java 386056 2006-03-15 11:31:56Z tcurdt $
25  * @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
26  */
27 public class DCONST extends Instruction implements ConstantPushInstruction, TypedInstruction {
28
29     private double value;
30
31
32     /**
33      * Empty constructor needed for the Class.newInstance() statement in
34      * Instruction.readInstruction(). Not to be used otherwise.
35      */
36     DCONST() {
37     }
38
39
40     public DCONST(double f) {
41         super(org.apache.bcel.Constants.DCONST_0, (short) 1);
42         if (f == 0.0) {
43             opcode = org.apache.bcel.Constants.DCONST_0;
44         } else if (f == 1.0) {
45             opcode = org.apache.bcel.Constants.DCONST_1;
46         } else {
47             throw new ClassGenException("DCONST can be used only for 0.0 and 1.0: " + f);
48         }
49         value = f;
50     }
51
52
53     public Number JavaDoc getValue() {
54         return new Double JavaDoc(value);
55     }
56
57
58     /** @return Type.DOUBLE
59      */
60     public Type getType( ConstantPoolGen cp ) {
61         return Type.DOUBLE;
62     }
63
64
65     /**
66      * Call corresponding visitor method(s). The order is:
67      * Call visitor methods of implemented interfaces first, then
68      * call methods according to the class hierarchy in descending order,
69      * i.e., the most specific visitXXX() call comes last.
70      *
71      * @param v Visitor object
72      */
73     public void accept( Visitor v ) {
74         v.visitPushInstruction(this);
75         v.visitStackProducer(this);
76         v.visitTypedInstruction(this);
77         v.visitConstantPushInstruction(this);
78         v.visitDCONST(this);
79     }
80 }
81
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