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