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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 import org.eclipse.core.databinding.conversion.Converter;
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14
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15 import java.lang.all;
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16 import java.nonstandard.RuntimeTraits;
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17
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18 import java.math.BigInteger;
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19
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20 import com.ibm.icu.text.NumberFormat;
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21
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22 /**
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23 * Converts a Number to a String using <code>NumberFormat.format(...)</code>.
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24 * This class is thread safe.
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25 *
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26 * @since 1.0
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27 */
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28 public class NumberToStringConverter : Converter {
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29 private final NumberFormat numberFormat;
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30 private final TypeInfo fromType;
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31 private bool fromTypeIsLong;
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32 private bool fromTypeIsDecimalType;
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33 private bool fromTypeIsBigInteger;
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34
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35 /**
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36 * Constructs a new instance.
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37 * <p>
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38 * Private to restrict public instantiation.
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39 * </p>
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40 *
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41 * @param numberFormat
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42 * @param fromType
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43 */
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44 private this(NumberFormat numberFormat, TypeInfo fromType) {
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45 super(fromType, typeid(StringCls));
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46
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47 this.numberFormat = numberFormat;
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48 this.fromType = fromType;
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49
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50 if (typeid(Integer) is fromType || Integer.TYPE is fromType
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51 || typeid(Long) is (fromType) || Long.TYPE is (fromType)) {
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52 fromTypeIsLong = true;
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53 } else if (typeid(Float) is (fromType) || Float.TYPE is (fromType)
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54 || typeid(Double) is (fromType)
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55 || Double.TYPE is (fromType)) {
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56 fromTypeIsDecimalType = true;
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57 } else if (typeid(BigInteger) is (fromType)) {
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58 fromTypeIsBigInteger = true;
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59 }
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60 }
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61
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62 /**
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63 * Converts the provided <code>fromObject</code> to a <code>String</code>.
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64 * If the converter was constructed for an object type, non primitive, a
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65 * <code>fromObject</code> of <code>null</code> will be converted to an
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66 * empty string.
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67 *
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68 * @param fromObject
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69 * value to convert. May be <code>null</code> if the converter
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70 * was constructed for a non primitive type.
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71 * @see org.eclipse.core.databinding.conversion.IConverter#convert(java.lang.Object)
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72 */
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73 public Object convert(Object fromObject) {
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74 // Null is allowed when the type is not primitve.
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75 if (fromObject is null && !isJavaPrimitive(fromType)) {
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76 return stringcast(""); //$NON-NLS-1$
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78
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77 }
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78
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79 Number number = cast(Number) fromObject;
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80 String result = null;
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81 if (fromTypeIsLong) {
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82 synchronized (numberFormat) {
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83 result = numberFormat.format(number.longValue());
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84 }
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85 } else if (fromTypeIsDecimalType) {
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86 synchronized (numberFormat) {
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87 result = numberFormat.format(number.doubleValue());
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88 }
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89 } else if (fromTypeIsBigInteger) {
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90 synchronized (numberFormat) {
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91 result = numberFormat.format(cast(BigInteger) number);
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92 }
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93 }
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94
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95 return stringcast(result);
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96 }
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97
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98 /**
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99 * @param primitive
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100 * <code>true</code> if the type is a double
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101 * @return Double converter for the default locale
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102 */
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103 public static NumberToStringConverter fromDouble(bool primitive) {
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104 return fromDouble(NumberFormat.getNumberInstance(), primitive);
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105 }
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106
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107 /**
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108 * @param numberFormat
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109 * @param primitive
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110 * @return Double converter with the provided numberFormat
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111 */
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112 public static NumberToStringConverter fromDouble(NumberFormat numberFormat,
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113 bool primitive) {
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114 return new NumberToStringConverter(numberFormat,
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115 (primitive) ? Double.TYPE : typeid(Double));
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116 }
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117
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118 /**
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119 * @param primitive
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120 * <code>true</code> if the type is a long
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121 * @return Long converter for the default locale
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122 */
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123 public static NumberToStringConverter fromLong(bool primitive) {
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124 return fromLong(NumberFormat.getIntegerInstance(), primitive);
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125 }
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126
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127 /**
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128 * @param numberFormat
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129 * @param primitive
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130 * @return Long convert with the provided numberFormat
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131 */
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132 public static NumberToStringConverter fromLong(NumberFormat numberFormat,
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133 bool primitive) {
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134 return new NumberToStringConverter(numberFormat,
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135 (primitive) ? Long.TYPE : typeid(Long));
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136 }
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137
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138 /**
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139 * @param primitive
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140 * <code>true</code> if the type is a float
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141 * @return Float converter for the default locale
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142 */
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143 public static NumberToStringConverter fromFloat(bool primitive) {
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144 return fromFloat(NumberFormat.getNumberInstance(), primitive);
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145 }
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146
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147 /**
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148 * @param numberFormat
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149 * @param primitive
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150 * @return Float converter with the provided numberFormat
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151 */
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152 public static NumberToStringConverter fromFloat(NumberFormat numberFormat,
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153 bool primitive) {
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154 return new NumberToStringConverter(numberFormat,
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155 (primitive) ? Float.TYPE : typeid(Float));
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156 }
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157
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158 /**
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159 * @param primitive
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160 * <code>true</code> if the type is a int
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161 * @return Integer converter for the default locale
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162 */
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163 public static NumberToStringConverter fromInteger(bool primitive) {
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164 return fromInteger(NumberFormat.getIntegerInstance(), primitive);
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165 }
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166
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167 /**
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168 * @param numberFormat
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169 * @param primitive
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170 * @return Integer converter with the provided numberFormat
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171 */
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172 public static NumberToStringConverter fromInteger(
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173 NumberFormat numberFormat, bool primitive) {
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174 return new NumberToStringConverter(numberFormat,
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175 (primitive) ? Integer.TYPE : typeid(Integer));
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176 }
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177
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178 /**
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179 * @return BigInteger convert for the default locale
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180 */
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181 public static NumberToStringConverter fromBigInteger() {
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182 return fromBigInteger(NumberFormat.getIntegerInstance());
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183 }
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184
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185 /**
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186 * @param numberFormat
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187 * @return BigInteger converter with the provided numberFormat
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188 */
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189 public static NumberToStringConverter fromBigInteger(
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190 NumberFormat numberFormat) {
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191 return new NumberToStringConverter(numberFormat, typeid(BigInteger));
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78
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192 }
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193 }
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