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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   https://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.bcel.generic;
20  
21  /**
22   * FCONST - Push 0.0, 1.0 or 2.0, other values cause an exception
23   *
24   * <PRE>
25   * Stack: ... -&gt; ...,
26   * </PRE>
27   */
28  public class FCONST extends Instruction implements ConstantPushInstruction {
29  
30      private final float value;
31  
32      /**
33       * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
34       */
35      FCONST() {
36          this(0);
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       * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
55       * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
56       *
57       * @param v Visitor object
58       */
59      @Override
60      public void accept(final Visitor v) {
61          v.visitPushInstruction(this);
62          v.visitStackProducer(this);
63          v.visitTypedInstruction(this);
64          v.visitConstantPushInstruction(this);
65          v.visitFCONST(this);
66      }
67  
68      /**
69       * @return Type.FLOAT
70       */
71      @Override
72      public Type getType(final ConstantPoolGen cp) {
73          return Type.FLOAT;
74      }
75  
76      @Override
77      public Number getValue() {
78          return Float.valueOf(value);
79      }
80  }