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 * ICONST - Push value between -1, ..., 5, other values cause an exception
23 *
24 * <PRE>
25 * Stack: ... -> ...,
26 * </PRE>
27 */
28 public class ICONST extends Instruction implements ConstantPushInstruction {
29
30 private final int value;
31
32 /**
33 * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
34 */
35 ICONST() {
36 this(0);
37 }
38
39 public ICONST(final int i) {
40 super(org.apache.bcel.Const.ICONST_0, (short) 1);
41 if (i < -1 || i > 5) {
42 throw new ClassGenException("ICONST can be used only for value between -1 and 5: " + i);
43 }
44 super.setOpcode((short) (org.apache.bcel.Const.ICONST_0 + i)); // Even works for i == -1
45 value = i;
46 }
47
48 /**
49 * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
50 * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
51 *
52 * @param v Visitor object
53 */
54 @Override
55 public void accept(final Visitor v) {
56 v.visitPushInstruction(this);
57 v.visitStackProducer(this);
58 v.visitTypedInstruction(this);
59 v.visitConstantPushInstruction(this);
60 v.visitICONST(this);
61 }
62
63 /**
64 * @return Type.INT
65 */
66 @Override
67 public Type getType(final ConstantPoolGen cp) {
68 return Type.INT;
69 }
70
71 @Override
72 public Number getValue() {
73 return Integer.valueOf(value);
74 }
75 }