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 package org.apache.bcel.generic;
18
19 /**
20 * FCONST - Push 0.0, 1.0 or 2.0, other values cause an exception
21 *
22 * <PRE>
23 * Stack: ... -> ...,
24 * </PRE>
25 */
26 public class FCONST extends Instruction implements ConstantPushInstruction {
27
28 private final float value;
29
30 /**
31 * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
32 */
33 FCONST() {
34 this(0);
35 }
36
37 public FCONST(final float f) {
38 super(org.apache.bcel.Const.FCONST_0, (short) 1);
39 if (f == 0.0) {
40 super.setOpcode(org.apache.bcel.Const.FCONST_0);
41 } else if (f == 1.0) {
42 super.setOpcode(org.apache.bcel.Const.FCONST_1);
43 } else if (f == 2.0) {
44 super.setOpcode(org.apache.bcel.Const.FCONST_2);
45 } else {
46 throw new ClassGenException("FCONST can be used only for 0.0, 1.0 and 2.0: " + f);
47 }
48 value = f;
49 }
50
51 /**
52 * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
53 * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
54 *
55 * @param v Visitor object
56 */
57 @Override
58 public void accept(final Visitor v) {
59 v.visitPushInstruction(this);
60 v.visitStackProducer(this);
61 v.visitTypedInstruction(this);
62 v.visitConstantPushInstruction(this);
63 v.visitFCONST(this);
64 }
65
66 /**
67 * @return Type.FLOAT
68 */
69 @Override
70 public Type getType(final ConstantPoolGen cp) {
71 return Type.FLOAT;
72 }
73
74 @Override
75 public Number getValue() {
76 return Float.valueOf(value);
77 }
78 }