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