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5  * Copyright (c) 2000 The Apache Software Foundation. All rights
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24  * Alternately, this acknowledgment may appear in the software itself,
25  * if and wherever such third-party acknowledgments normally appear.
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50  * This software consists of voluntary contributions made by many
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52  * originally based on software copyright (c) 2000, International
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57
58 package org.apache.soap.encoding.soapenc;
59
60 /**
61  * FPDeserUtil: Utilities to help with deserialization of
62  * floating point special values.
63  *
64  * Supplements Java.lang deserialization of float, Float, double, and
65  * Double by handling the special values INF, -INF, and NaN, something
66  * that Java doesn't do (i.e. new Float("INF") will cause a
67  * NumberFormatException).
68  *
69  * These special values specify infinity, negative infinity,
70  * and Not-a-Number in the XML Schema - Datatypes specification
71  * for the primitive datatypes "float" (Section 3.2.4.1) and
72  * "double" (Section 3.2.5.1).
73  *
74  * Also accepts "Infinity" for "INF" and "-Infinity" for "-INF"
75  * (case-insensitive) because that's what Java generates for
76  * toString() of a Float or Double.
77  *
78  * See: <a HREF="http://www.w3.org/TR/xmlschema-2/">XML Schema
79  * Part 2: Datatypes (W3C PR 16 March 2001)</a>
80  *
81  * @author Jim Stearns (Jim_Stearns@hp.com)
82  */
83 public class FPDeserUtil
84 {
85     // Static methods only, so disable constructor
86 private FPDeserUtil()
87     {
88     }
89
90     // Deserialize INF, -INF, and NaN, too.
91 public static Float JavaDoc newFloat(String JavaDoc value)
92     {
93         Float JavaDoc res = null;
94         try {
95             res = new Float JavaDoc(value);
96         } catch (NumberFormatException JavaDoc e) {
97             if (value.equals("INF")
98             || value.toLowerCase().equals("infinity")) {
99                 return new Float JavaDoc(Float.POSITIVE_INFINITY);
100             } else if (value.equals("-INF")
101             || value.toLowerCase().equals("-infinity")) {
102                 return new Float JavaDoc(Float.NEGATIVE_INFINITY);
103             } else if (value.equals("NaN")) {
104                 return new Float JavaDoc(Float.NaN);
105             }
106             throw e;
107         }
108         return res;
109     }
110
111     public static Double JavaDoc newDouble(String JavaDoc value)
112     {
113         Double JavaDoc res = null;
114         try {
115             res = new Double JavaDoc(value);
116         } catch (NumberFormatException JavaDoc e) {
117             if (value.equals("INF")
118             || value.toLowerCase().equals("infinity")) {
119                 return new Double JavaDoc(Double.POSITIVE_INFINITY);
120             } else if (value.equals("-INF")
121             || value.toLowerCase().equals("-infinity")) {
122                 return new Double JavaDoc(Double.NEGATIVE_INFINITY);
123             } else if (value.equals("NaN")) {
124                 return new Double JavaDoc(Double.NaN);
125             }
126             throw e;
127         }
128         return res;
129     }
130 }
131
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