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 * ICONST - Push value between -1, ..., 5, other values cause an exception
21 *
22 * <PRE>
23 * Stack: ... -> ...,
24 * </PRE>
25 */
26 public class ICONST extends Instruction implements ConstantPushInstruction {
27
28 private final int value;
29
30 /**
31 * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
32 */
33 ICONST() {
34 this(0);
35 }
36
37 public ICONST(final int i) {
38 super(org.apache.bcel.Const.ICONST_0, (short) 1);
39 if (i < -1 || i > 5) {
40 throw new ClassGenException("ICONST can be used only for value between -1 and 5: " + i);
41 }
42 super.setOpcode((short) (org.apache.bcel.Const.ICONST_0 + i)); // Even works for i == -1
43 value = i;
44 }
45
46 /**
47 * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
48 * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
49 *
50 * @param v Visitor object
51 */
52 @Override
53 public void accept(final Visitor v) {
54 v.visitPushInstruction(this);
55 v.visitStackProducer(this);
56 v.visitTypedInstruction(this);
57 v.visitConstantPushInstruction(this);
58 v.visitICONST(this);
59 }
60
61 /**
62 * @return Type.INT
63 */
64 @Override
65 public Type getType(final ConstantPoolGen cp) {
66 return Type.INT;
67 }
68
69 @Override
70 public Number getValue() {
71 return Integer.valueOf(value);
72 }
73 }