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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: ICONST.html 1021978 2017-12-09 17:38:21Z ggregory $
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       */
36      ICONST() {
37      }
38  
39  
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
52      public Number getValue() {
53          return Integer.valueOf(value);
54      }
55  
56  
57      /** @return Type.INT
58       */
59      @Override
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
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  }