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  */
18 package org.apache.bcel.generic;
19 
20 /**
21  * ICONST - Push value between -1, ..., 5, other values cause an exception
22  *
23  * <PRE>Stack: ... -&gt; ..., </PRE>
24  *
25  * @version $Id$
26  */
27 public class ICONST extends Instruction implements ConstantPushInstruction {
28 
29     private int value;
30 
31 
32     /**
33      * Empty constructor needed for Instruction.readInstruction.
34      * Not to be used otherwise.
35      */
ICONST()36     ICONST() {
37     }
38 
39 
ICONST(final int i)40     public ICONST(final int i) {
41         super(org.apache.bcel.Const.ICONST_0, (short) 1);
42         if ((i >= -1) && (i <= 5)) {
43             super.setOpcode((short) (org.apache.bcel.Const.ICONST_0 + i)); // Even works for i == -1
44         } else {
45             throw new ClassGenException("ICONST can be used only for value between -1 and 5: " + i);
46         }
47         value = i;
48     }
49 
50 
51     @Override
getValue()52     public Number getValue() {
53         return Integer.valueOf(value);
54     }
55 
56 
57     /** @return Type.INT
58      */
59     @Override
getType( final ConstantPoolGen cp )60     public Type getType( final ConstantPoolGen cp ) {
61         return Type.INT;
62     }
63 
64 
65     /**
66      * Call corresponding visitor method(s). The order is:
67      * Call visitor methods of implemented interfaces first, then
68      * call methods according to the class hierarchy in descending order,
69      * i.e., the most specific visitXXX() call comes last.
70      *
71      * @param v Visitor object
72      */
73     @Override
accept( final Visitor v )74     public void accept( final Visitor v ) {
75         v.visitPushInstruction(this);
76         v.visitStackProducer(this);
77         v.visitTypedInstruction(this);
78         v.visitConstantPushInstruction(this);
79         v.visitICONST(this);
80     }
81 }
82