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 * LCONST - Push 0 or 1, other values cause an exception
23 *
24 * <pre>
25 * Stack: ... -> ...,
26 * </pre>
27 */
28 public class LCONST extends Instruction implements ConstantPushInstruction {
29
30 private final long value;
31
32 /**
33 * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
34 */
35 LCONST() {
36 this(0);
37 }
38
39 /**
40 * Constructs an LCONST instruction.
41 *
42 * @param l long constant value.
43 */
44 public LCONST(final long l) {
45 super(org.apache.bcel.Const.LCONST_0, (short) 1);
46 if (l == 0) {
47 super.setOpcode(org.apache.bcel.Const.LCONST_0);
48 } else if (l == 1) {
49 super.setOpcode(org.apache.bcel.Const.LCONST_1);
50 } else {
51 throw new ClassGenException("LCONST can be used only for 0 and 1: " + l);
52 }
53 value = l;
54 }
55
56 /**
57 * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
58 * methods according to the class hierarchy in descending order, that is, the most specific visitXXX() call comes last.
59 *
60 * @param v Visitor object.
61 */
62 @Override
63 public void accept(final Visitor v) {
64 v.visitPushInstruction(this);
65 v.visitStackProducer(this);
66 v.visitTypedInstruction(this);
67 v.visitConstantPushInstruction(this);
68 v.visitLCONST(this);
69 }
70
71 /**
72 * @return Type.LONG.
73 */
74 @Override
75 public Type getType(final ConstantPoolGen cp) {
76 return Type.LONG;
77 }
78
79 @Override
80 public Number getValue() {
81 return Long.valueOf(value);
82 }
83 }