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 /**
21  * FCONST - Push 0.0, 1.0 or 2.0, other values cause an exception
22  *
23  * <PRE>Stack: ... -&gt; ..., </PRE>
24  *
25  * @version $Id$
26  */
27 public class FCONST extends Instruction implements ConstantPushInstruction {
28 
29     private float value;
30 
31 
32     /**
33      * Empty constructor needed for Instruction.readInstruction.
34      * Not to be used otherwise.
35      */
FCONST()36     FCONST() {
37     }
38 
39 
FCONST(final float f)40     public FCONST(final float f) {
41         super(org.apache.bcel.Const.FCONST_0, (short) 1);
42         if (f == 0.0) {
43             super.setOpcode(org.apache.bcel.Const.FCONST_0);
44         } else if (f == 1.0) {
45             super.setOpcode(org.apache.bcel.Const.FCONST_1);
46         } else if (f == 2.0) {
47             super.setOpcode(org.apache.bcel.Const.FCONST_2);
48         } else {
49             throw new ClassGenException("FCONST can be used only for 0.0, 1.0 and 2.0: " + f);
50         }
51         value = f;
52     }
53 
54 
55     @Override
getValue()56     public Number getValue() {
57         return new Float(value);
58     }
59 
60 
61     /** @return Type.FLOAT
62      */
63     @Override
getType( final ConstantPoolGen cp )64     public Type getType( final ConstantPoolGen cp ) {
65         return Type.FLOAT;
66     }
67 
68 
69     /**
70      * Call corresponding visitor method(s). The order is:
71      * Call visitor methods of implemented interfaces first, then
72      * call methods according to the class hierarchy in descending order,
73      * i.e., the most specific visitXXX() call comes last.
74      *
75      * @param v Visitor object
76      */
77     @Override
accept( final Visitor v )78     public void accept( final Visitor v ) {
79         v.visitPushInstruction(this);
80         v.visitStackProducer(this);
81         v.visitTypedInstruction(this);
82         v.visitConstantPushInstruction(this);
83         v.visitFCONST(this);
84     }
85 }
86