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: ... -> ...,
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 /**
40 * Constructs an FCONST instruction.
41 *
42 * @param f the float value.
43 */
44 public FCONST(final float f) {
45 super(org.apache.bcel.Const.FCONST_0, (short) 1);
46 if (f == 0.0) {
47 super.setOpcode(org.apache.bcel.Const.FCONST_0);
48 } else if (f == 1.0) {
49 super.setOpcode(org.apache.bcel.Const.FCONST_1);
50 } else if (f == 2.0) {
51 super.setOpcode(org.apache.bcel.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 * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
60 * methods according to the class hierarchy in descending order, that is, the most specific visitXXX() call comes last.
61 *
62 * @param v Visitor object.
63 */
64 @Override
65 public void accept(final Visitor v) {
66 v.visitPushInstruction(this);
67 v.visitStackProducer(this);
68 v.visitTypedInstruction(this);
69 v.visitConstantPushInstruction(this);
70 v.visitFCONST(this);
71 }
72
73 /**
74 * @return Type.FLOAT.
75 */
76 @Override
77 public Type getType(final ConstantPoolGen cp) {
78 return Type.FLOAT;
79 }
80
81 @Override
82 public Number getValue() {
83 return Float.valueOf(value);
84 }
85 }