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Java > Open Source Codes > soot > coffi > CONSTANT_Double_info


1 /* Soot - a J*va Optimization Framework
2  * Copyright (C) 1997 Clark Verbrugge
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with this library; if not, write to the
16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17  * Boston, MA 02111-1307, USA.
18  */
19
20 /*
21  * Modified by the Sable Research Group and others 1997-1999.
22  * See the 'credits' file distributed with Soot for the complete list of
23  * contributors. (Soot is distributed at http://www.sable.mcgill.ca/soot)
24  */
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32 package soot.coffi;
33
34 import java.io.*;
35
36 /** A constant pool entry of type CONSTANT_Double.
37  * @see cp_info
38  * @author Clark Verbrugge
39  */
40 class CONSTANT_Double_info extends cp_info {
41    /** High-order 32 bits of the double. */
42    public long high;
43    /** High-order 32 bits of the double. */
44    public long low;
45    /** Returns the size of this cp_info object.
46     * @return number of bytes occupied by this object.
47     * @see cp_info#size
48     */
49    public int size() { return 9; }
50    /** Converts the internal representation (two ints) to a double. */
51    public double convert() { return Double.longBitsToDouble(ints2long(high,low)); }
52    /** Returns a String representation of this entry.
53     * @param constant_pool constant pool of ClassFile.
54     * @return String representation of this entry.
55     * @see cp_info#toString
56     */
57    public String JavaDoc toString(cp_info constant_pool[]) {
58       return Double.toString(convert());
59    }
60    /** Returns a String description of what kind of entry this is.
61     * @return the String "double".
62     * @see cp_info#typeName
63     */
64    public String JavaDoc typeName() { return "double"; }
65    /** Compares this entry with another cp_info object (which may reside
66     * in a different constant pool).
67     * @param constant_pool constant pool of ClassFile for this.
68     * @param cp constant pool entry to compare against.
69     * @param cp_constant_pool constant pool of ClassFile for cp.
70     * @return a value <0, 0, or >0 indicating whether this is smaller,
71     * the same or larger than cp.
72     * @see cp_info#compareTo
73     */
74    public int compareTo(cp_info constant_pool[],cp_info cp,cp_info cp_constant_pool[]) {
75       double d;
76       if (tag!=cp.tag) return tag-cp.tag;
77       CONSTANT_Double_info cu = (CONSTANT_Double_info)cp;
78       d = convert()-cu.convert();
79       return ((d>0.0) ? 1 : ((d<0.0) ? -1 : 0));
80    }
81 }
82
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