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1   /*
2    * Copyright  2000-2004 The Apache Software Foundation
3    *
4    *  Licensed under the Apache License, Version 2.0 (the "License"); 
5    *  you may not use this file except in compliance with the License.
6    *  You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   *  Unless required by applicable law or agreed to in writing, software
11   *  distributed under the License is distributed on an "AS IS" BASIS,
12   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   *  See the License for the specific language governing permissions and
14   *  limitations under the License. 
15   *
16   */
17  package org.apache.bcel.generic;
18  
19  /*** 
20   * ICONST - Push value between -1, ..., 5, other values cause an exception
21   *
22   * <PRE>Stack: ... -&gt; ..., </PRE>
23   *
24   * @version $Id: ICONST.java 386056 2006-03-15 11:31:56Z tcurdt $
25   * @author  <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
26   */
27  public class ICONST extends Instruction implements ConstantPushInstruction, TypedInstruction {
28  
29      private int value;
30  
31  
32      /***
33       * Empty constructor needed for the Class.newInstance() statement in
34       * Instruction.readInstruction(). Not to be used otherwise.
35       */
36      ICONST() {
37      }
38  
39  
40      public ICONST(int i) {
41          super(org.apache.bcel.Constants.ICONST_0, (short) 1);
42          if ((i >= -1) && (i <= 5)) {
43              opcode = (short) (org.apache.bcel.Constants.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      public Number getValue() {
52          return new Integer(value);
53      }
54  
55  
56      /*** @return Type.INT
57       */
58      public Type getType( ConstantPoolGen cp ) {
59          return Type.INT;
60      }
61  
62  
63      /***
64       * Call corresponding visitor method(s). The order is:
65       * Call visitor methods of implemented interfaces first, then
66       * call methods according to the class hierarchy in descending order,
67       * i.e., the most specific visitXXX() call comes last.
68       *
69       * @param v Visitor object
70       */
71      public void accept( Visitor v ) {
72          v.visitPushInstruction(this);
73          v.visitStackProducer(this);
74          v.visitTypedInstruction(this);
75          v.visitConstantPushInstruction(this);
76          v.visitICONST(this);
77      }
78  }