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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: FCONST.html 1021978 2017-12-09 17:38:21Z ggregory $
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       */
36      FCONST() {
37      }
38  
39  
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
56      public Number getValue() {
57          return new Float(value);
58      }
59  
60  
61      /** @return Type.FLOAT
62       */
63      @Override
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
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  }