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comparison org.eclipse.core.databinding/src/org/eclipse/core/databinding/conversion/NumberToStringConverter.d @ 78:0a55d2d5a946

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Added file for databinding
author Frank Benoit <benoit@tionex.de>
date Tue, 14 Apr 2009 11:35:29 +0200
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76:f05e6e8b2f2d 78:0a55d2d5a946
1 /*******************************************************************************
2 * Copyright (c) 2007 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * IBM Corporation - initial API and implementation
10 ******************************************************************************/
11
12 module org.eclipse.core.databinding.conversion.NumberToStringConverter;
13
14 import java.lang.all;
15
16 import java.math.BigInteger;
17
18 import com.ibm.icu.text.NumberFormat;
19
20 /**
21 * Converts a Number to a String using <code>NumberFormat.format(...)</code>.
22 * This class is thread safe.
23 *
24 * @since 1.0
25 */
26 public class NumberToStringConverter : Converter {
27 private final NumberFormat numberFormat;
28 private final ClassInfo fromType;
29 private bool fromTypeIsLong;
30 private bool fromTypeIsDecimalType;
31 private bool fromTypeIsBigInteger;
32
33 /**
34 * Constructs a new instance.
35 * <p>
36 * Private to restrict public instantiation.
37 * </p>
38 *
39 * @param numberFormat
40 * @param fromType
41 */
42 private this(NumberFormat numberFormat, ClassInfo fromType) {
43 super(fromType, String.classinfo);
44
45 this.numberFormat = numberFormat;
46 this.fromType = fromType;
47
48 if (Integer.classinfo.equals(fromType) || Integer.TYPE.equals(fromType)
49 || Long.classinfo.equals(fromType) || Long.TYPE.equals(fromType)) {
50 fromTypeIsLong = true;
51 } else if (Float.classinfo.equals(fromType) || Float.TYPE.equals(fromType)
52 || Double.classinfo.equals(fromType)
53 || Double.TYPE.equals(fromType)) {
54 fromTypeIsDecimalType = true;
55 } else if (BigInteger.classinfo.equals(fromType)) {
56 fromTypeIsBigInteger = true;
57 }
58 }
59
60 /**
61 * Converts the provided <code>fromObject</code> to a <code>String</code>.
62 * If the converter was constructed for an object type, non primitive, a
63 * <code>fromObject</code> of <code>null</code> will be converted to an
64 * empty string.
65 *
66 * @param fromObject
67 * value to convert. May be <code>null</code> if the converter
68 * was constructed for a non primitive type.
69 * @see org.eclipse.core.databinding.conversion.IConverter#convert(java.lang.Object)
70 */
71 public Object convert(Object fromObject) {
72 // Null is allowed when the type is not primitve.
73 if (fromObject is null && !fromType.isPrimitive()) {
74 return ""; //$NON-NLS-1$
75 }
76
77 Number number = cast(Number) fromObject;
78 String result = null;
79 if (fromTypeIsLong) {
80 synchronized (numberFormat) {
81 result = numberFormat.format(number.longValue());
82 }
83 } else if (fromTypeIsDecimalType) {
84 synchronized (numberFormat) {
85 result = numberFormat.format(number.doubleValue());
86 }
87 } else if (fromTypeIsBigInteger) {
88 synchronized (numberFormat) {
89 result = numberFormat.format(cast(BigInteger) number);
90 }
91 }
92
93 return result;
94 }
95
96 /**
97 * @param primitive
98 * <code>true</code> if the type is a double
99 * @return Double converter for the default locale
100 */
101 public static NumberToStringConverter fromDouble(bool primitive) {
102 return fromDouble(NumberFormat.getNumberInstance(), primitive);
103 }
104
105 /**
106 * @param numberFormat
107 * @param primitive
108 * @return Double converter with the provided numberFormat
109 */
110 public static NumberToStringConverter fromDouble(NumberFormat numberFormat,
111 bool primitive) {
112 return new NumberToStringConverter(numberFormat,
113 (primitive) ? Double.TYPE : Double.classinfo);
114 }
115
116 /**
117 * @param primitive
118 * <code>true</code> if the type is a long
119 * @return Long converter for the default locale
120 */
121 public static NumberToStringConverter fromLong(bool primitive) {
122 return fromLong(NumberFormat.getIntegerInstance(), primitive);
123 }
124
125 /**
126 * @param numberFormat
127 * @param primitive
128 * @return Long convert with the provided numberFormat
129 */
130 public static NumberToStringConverter fromLong(NumberFormat numberFormat,
131 bool primitive) {
132 return new NumberToStringConverter(numberFormat,
133 (primitive) ? Long.TYPE : Long.classinfo);
134 }
135
136 /**
137 * @param primitive
138 * <code>true</code> if the type is a float
139 * @return Float converter for the default locale
140 */
141 public static NumberToStringConverter fromFloat(bool primitive) {
142 return fromFloat(NumberFormat.getNumberInstance(), primitive);
143 }
144
145 /**
146 * @param numberFormat
147 * @param primitive
148 * @return Float converter with the provided numberFormat
149 */
150 public static NumberToStringConverter fromFloat(NumberFormat numberFormat,
151 bool primitive) {
152 return new NumberToStringConverter(numberFormat,
153 (primitive) ? Float.TYPE : Float.classinfo);
154 }
155
156 /**
157 * @param primitive
158 * <code>true</code> if the type is a int
159 * @return Integer converter for the default locale
160 */
161 public static NumberToStringConverter fromInteger(bool primitive) {
162 return fromInteger(NumberFormat.getIntegerInstance(), primitive);
163 }
164
165 /**
166 * @param numberFormat
167 * @param primitive
168 * @return Integer converter with the provided numberFormat
169 */
170 public static NumberToStringConverter fromInteger(
171 NumberFormat numberFormat, bool primitive) {
172 return new NumberToStringConverter(numberFormat,
173 (primitive) ? Integer.TYPE : Integer.classinfo);
174 }
175
176 /**
177 * @return BigInteger convert for the default locale
178 */
179 public static NumberToStringConverter fromBigInteger() {
180 return fromBigInteger(NumberFormat.getIntegerInstance());
181 }
182
183 /**
184 * @param numberFormat
185 * @return BigInteger converter with the provided numberFormat
186 */
187 public static NumberToStringConverter fromBigInteger(
188 NumberFormat numberFormat) {
189 return new NumberToStringConverter(numberFormat, BigInteger.classinfo);
190 }
191 }