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
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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.
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37   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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47   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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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   * DCONST - Push 0.0 or 1.0, other values cause an exception
59   *
60   * <PRE>Stack: ... -> ..., </PRE>
61   *
62   * @version $Id: DCONST.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 DCONST extends Instruction
66    implements ConstantPushInstruction, TypedInstruction {
67    private double value;
68  
69    /***
70     * Empty constructor needed for the Class.newInstance() statement in
71     * Instruction.readInstruction(). Not to be used otherwise.
72     */
73    DCONST() {}
74  
75    public DCONST(double f) {
76      super(org.apache.bcel.Constants.DCONST_0, (short)1);
77  
78      if(f == 0.0)
79        opcode = org.apache.bcel.Constants.DCONST_0;
80      else if(f == 1.0)
81        opcode = org.apache.bcel.Constants.DCONST_1;
82      else
83        throw new ClassGenException("DCONST can be used only for 0.0 and 1.0: " + f);
84  
85      value = f;
86    }
87  
88    public Number getValue() { return new Double(value); }
89  
90    /*** @return Type.DOUBLE
91     */
92    public Type getType(ConstantPoolGen cp) {
93      return Type.DOUBLE;
94    }
95  
96    /***
97     * Call corresponding visitor method(s). The order is:
98     * Call visitor methods of implemented interfaces first, then
99     * call methods according to the class hierarchy in descending order,
100    * i.e., the most specific visitXXX() call comes last.
101    *
102    * @param v Visitor object
103    */
104   public void accept(Visitor v) {
105     v.visitPushInstruction(this);
106     v.visitStackProducer(this);
107     v.visitTypedInstruction(this);
108     v.visitConstantPushInstruction(this);
109     v.visitDCONST(this);
110   }
111 }
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