1 /*
2  * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
3  */
4 /*
5  * Licensed to the Apache Software Foundation (ASF) under one or more
6  * contributor license agreements.  See the NOTICE file distributed with
7  * this work for additional information regarding copyright ownership.
8  * The ASF licenses this file to You under the Apache License, Version 2.0
9  * (the "License"); you may not use this file except in compliance with
10  * the License.  You may obtain a copy of the License at
11  *
12  *      http://www.apache.org/licenses/LICENSE-2.0
13  *
14  * Unless required by applicable law or agreed to in writing, software
15  * distributed under the License is distributed on an "AS IS" BASIS,
16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17  * See the License for the specific language governing permissions and
18  * limitations under the License.
19  */
20 
21 package com.sun.org.apache.bcel.internal.generic;
22 
23 /**
24  * FCONST - Push 0.0, 1.0 or 2.0, other values cause an exception
25  *
26  * <PRE>Stack: ... -&gt; ..., </PRE>
27  *
28  * @version $Id: FCONST.java 1747278 2016-06-07 17:28:43Z britter $
29  * @LastModified: Nov 2017
30  */
31 public class FCONST extends Instruction implements ConstantPushInstruction {
32 
33     private float value;
34 
35 
36     /**
37      * Empty constructor needed for the Class.newInstance() statement in
38      * Instruction.readInstruction(). Not to be used otherwise.
39      */
FCONST()40     FCONST() {
41     }
42 
43 
FCONST(final float f)44     public FCONST(final float f) {
45         super(com.sun.org.apache.bcel.internal.Const.FCONST_0, (short) 1);
46         if (f == 0.0) {
47             super.setOpcode(com.sun.org.apache.bcel.internal.Const.FCONST_0);
48         } else if (f == 1.0) {
49             super.setOpcode(com.sun.org.apache.bcel.internal.Const.FCONST_1);
50         } else if (f == 2.0) {
51             super.setOpcode(com.sun.org.apache.bcel.internal.Const.FCONST_2);
52         } else {
53             throw new ClassGenException("FCONST can be used only for 0.0, 1.0 and 2.0: " + f);
54         }
55         value = f;
56     }
57 
58 
59     @Override
getValue()60     public Number getValue() {
61         return value;
62     }
63 
64 
65     /** @return Type.FLOAT
66      */
67     @Override
getType( final ConstantPoolGen cp )68     public Type getType( final ConstantPoolGen cp ) {
69         return Type.FLOAT;
70     }
71 
72 
73     /**
74      * Call corresponding visitor method(s). The order is:
75      * Call visitor methods of implemented interfaces first, then
76      * call methods according to the class hierarchy in descending order,
77      * i.e., the most specific visitXXX() call comes last.
78      *
79      * @param v Visitor object
80      */
81     @Override
accept( final Visitor v )82     public void accept( final Visitor v ) {
83         v.visitPushInstruction(this);
84         v.visitStackProducer(this);
85         v.visitTypedInstruction(this);
86         v.visitConstantPushInstruction(this);
87         v.visitFCONST(this);
88     }
89 }
90