1   package org.apache.bcel.generic;
2   
3   /* ====================================================================
4    * The Apache Software License, Version 1.1
5    *
6    * Copyright (c) 2001 The Apache Software Foundation.  All rights
7    * reserved.
8    *
9    * Redistribution and use in source and binary forms, with or without
10   * modification, are permitted provided that the following conditions
11   * are met:
12   *
13   * 1. Redistributions of source code must retain the above copyright
14   *    notice, this list of conditions and the following disclaimer.
15   *
16   * 2. Redistributions in binary form must reproduce the above copyright
17   *    notice, this list of conditions and the following disclaimer in
18   *    the documentation and/or other materials provided with the
19   *    distribution.
20   *
21   * 3. The end-user documentation included with the redistribution,
22   *    if any, must include the following acknowledgment:
23   *       "This product includes software developed by the
24   *        Apache Software Foundation (http://www.apache.org/)."
25   *    Alternately, this acknowledgment may appear in the software itself,
26   *    if and wherever such third-party acknowledgments normally appear.
27   *
28   * 4. The names "Apache" and "Apache Software Foundation" and
29   *    "Apache BCEL" must not be used to endorse or promote products
30   *    derived from this software without prior written permission. For
31   *    written permission, please contact apache@apache.org.
32   *
33   * 5. Products derived from this software may not be called "Apache",
34   *    "Apache BCEL", nor may "Apache" appear in their name, without
35   *    prior written permission of the Apache Software Foundation.
36   *
37   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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39   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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43   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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45   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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47   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48   * SUCH DAMAGE.
49   * ====================================================================
50   *
51   * This software consists of voluntary contributions made by many
52   * individuals on behalf of the Apache Software Foundation.  For more
53   * information on the Apache Software Foundation, please see
54   * <http://www.apache.org/>.
55   */
56  
57  /*** 
58   * ICONST - Push value between -1, ..., 5, other values cause an exception
59   *
60   * <PRE>Stack: ... -> ..., </PRE>
61   *
62   * @version $Id: ICONST.java,v 1.3 2002/08/07 18:01:32 mdahm Exp $
63   * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
64   */
65  public class ICONST extends Instruction
66    implements ConstantPushInstruction, TypedInstruction {
67    private int value;
68  
69    /***
70     * Empty constructor needed for the Class.newInstance() statement in
71     * Instruction.readInstruction(). Not to be used otherwise.
72     */
73    ICONST() {}
74  
75    public ICONST(int i) {
76      super(org.apache.bcel.Constants.ICONST_0, (short)1);
77  
78      if((i >= -1) && (i <= 5))
79        opcode = (short)(org.apache.bcel.Constants.ICONST_0 + i); // Even works for i == -1
80      else
81        throw new ClassGenException("ICONST can be used only for value between -1 and 5: " +
82  				  i);
83      value = i;
84    }
85    
86    public Number getValue() { return new Integer(value); }
87  
88    /*** @return Type.INT
89     */
90    public Type getType(ConstantPoolGen cp) {
91      return Type.INT;
92    }
93  
94    /***
95     * Call corresponding visitor method(s). The order is:
96     * Call visitor methods of implemented interfaces first, then
97     * call methods according to the class hierarchy in descending order,
98     * i.e., the most specific visitXXX() call comes last.
99     *
100    * @param v Visitor object
101    */
102   public void accept(Visitor v) {
103     v.visitPushInstruction(this);
104     v.visitStackProducer(this);
105     v.visitTypedInstruction(this);
106     v.visitConstantPushInstruction(this);
107     v.visitICONST(this);
108   }
109 }
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