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1   /*
2    * $Id: FloatLocaleConverter.java,v 1.2 2004/04/09 18:44:53 eelco12 Exp $
3    * $Revision: 1.2 $
4    * $Date: 2004/04/09 18:44:53 $
5    *
6    * ====================================================================
7    * Copyright (c) 2003, Open Edge B.V.
8    * All rights reserved.
9    * Redistribution and use in source and binary forms, with or without 
10   * modification, are permitted provided that the following conditions are met:
11   * Redistributions of source code must retain the above copyright notice, 
12   * this list of conditions and the following disclaimer. Redistributions 
13   * in binary form must reproduce the above copyright notice, this list of 
14   * conditions and the following disclaimer in the documentation and/or other 
15   * materials provided with the distribution. Neither the name of OpenEdge B.V. 
16   * nor the names of its contributors may be used to endorse or promote products 
17   * derived from this software without specific prior written permission.
18   * 
19   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
20   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
21   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
22   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
23   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
24   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
25   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
26   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
27   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
28   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 
29   * THE POSSIBILITY OF SUCH DAMAGE.
30   */
31  package nl.openedge.baritus.converters;
32  
33  import java.util.Locale;
34  import java.text.ParseException;
35  
36  /***
37   * localized float converter
38   * @author Eelco Hillenius
39   */
40  public class FloatLocaleConverter extends DecimalLocaleConverter
41  {
42  
43  	// ----------------------------------------------------------- Constructors
44  
45  	/***
46  	 * Create a {@link LocaleConverter}
47  	 * that will throw a {@link ConversionException}
48  	 * if a conversion error occurs. The locale is the default locale for
49  	 * this instance of the Java Virtual Machine and an unlocalized pattern is used
50  	 * for the convertion.
51  	 *
52  	 */
53  	public FloatLocaleConverter()
54  	{
55  		this(Locale.getDefault());
56  	}
57  
58  	/***
59  	 * Create a {@link LocaleConverter}
60  	 * that will throw a {@link ConversionException}
61  	 * if a conversion error occurs. An unlocalized pattern is used for the convertion.
62  	 *
63  	 * @param locale        The locale
64  	 */
65  	public FloatLocaleConverter(Locale locale)
66  	{
67  		this(locale, null);
68  	}
69  
70  	/***
71  	 * Create a {@link LocaleConverter}
72  	 * that will throw a {@link ConversionException}
73  	 * if a conversion error occurs. An unlocalized pattern is used for the convertion.
74  	 *
75  	 * @param locale        The locale
76  	 * @param pattern       The convertion pattern
77  	 */
78  	public FloatLocaleConverter(Locale locale, String pattern)
79  	{
80  		this(locale, pattern, false);
81  	}
82  
83  	/***
84  	 * Create a {@link LocaleConverter}
85  	 * that will throw a {@link ConversionException}
86  	 * if a conversion error occurs.
87  	 *
88  	 * @param locale        The locale
89  	 * @param pattern       The convertion pattern
90  	 * @param locPattern    Indicate whether the pattern is localized or not
91  	 */
92  	public FloatLocaleConverter(
93  		Locale locale,
94  		String pattern,
95  		boolean locPattern)
96  	{
97  		super(locale, pattern, locPattern);
98  	}
99  
100 
101 	/***
102 	 * Convert the specified locale-sensitive input object into an output object of the
103 	 * specified type.  This method will return Float value or throw exception if value
104 	 * can not be stored in the Float.
105 	 *
106 	 * @param value The input object to be converted
107 	 * @param pattern The pattern is used for the convertion
108 	 *
109 	 * @exception ConversionException if conversion cannot be performed
110 	 *  successfully
111 	 */
112 	protected Object parse(Object value, String pattern) throws ParseException
113 	{
114 		final Number parsed = (Number) super.parse(value, pattern);
115 		if (Math.abs(parsed.doubleValue() - parsed.floatValue())
116 			> parsed.floatValue() * 0.00001)
117 		{
118 			throw new ConversionException(
119 				"Suplied number is not of type Float: " + parsed.longValue());
120 		}
121 		return new Float(parsed.floatValue());
122 		// unlike superclass it returns Float type
123 	}
124 	
125 	/***
126 	 * Convert the specified locale-sensitive input object into an output object of the
127 	 * specified type.
128 	 *
129 	 * @param type Data type to which this value should be converted
130 	 * @param value The input object to be converted
131 	 * @param pattern The pattern is used for the convertion
132 	 *
133 	 * @exception ConversionException if conversion cannot be performed
134 	 *  successfully
135 	 */
136 	public Object convert(Class type, Object value, String pattern)
137 	{
138 		if (value == null)
139 		{
140 			return null;
141 		}
142 		
143 		Number temp = getNumber(value, pattern);
144 		
145 		return (temp instanceof Float) ? (Float)temp : new Float(temp.floatValue());
146 	}
147 }