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