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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.StringToNumberConverter;
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13
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14 import java.lang.all;
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85
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15 import java.nonstandard.RuntimeTraits;
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16
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17 import java.math.BigDecimal;
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18 import java.math.BigInteger;
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19
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20 import org.eclipse.core.internal.databinding.conversion.StringToNumberParser;
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21 import org.eclipse.core.internal.databinding.validation.NumberFormatConverter;
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22
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23 import com.ibm.icu.text.NumberFormat;
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24
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25 /**
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26 * Converts a String to a Number using <code>NumberFormat.parse(...)</code>.
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27 * This class is thread safe.
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28 *
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29 * @since 1.0
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30 */
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31 public class StringToNumberConverter : NumberFormatConverter {
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32 private TypeInfo toType;
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33 /**
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34 * NumberFormat instance to use for conversion. Access must be synchronized.
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35 */
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36 private NumberFormat numberFormat;
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37
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38 /**
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39 * Minimum possible value for the type. Can be <code>null</code> as
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40 * BigInteger doesn't have bounds.
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41 */
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42 private final Number min;
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43 /**
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44 * Maximum possible value for the type. Can be <code>null</code> as
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45 * BigInteger doesn't have bounds.
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46 */
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47 private final Number max;
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48
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49 /**
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50 * The boxed type of the toType;
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51 */
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52 private final TypeInfo boxedType;
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53
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54 private static const Integer MIN_INTEGER;
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55 private static const Integer MAX_INTEGER;
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56
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57 private static const Double MIN_DOUBLE;
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58 private static const Double MAX_DOUBLE;
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59
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60 private static const Long MIN_LONG;
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61 private static const Long MAX_LONG;
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62
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63 private static const Float MIN_FLOAT;
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64 private static const Float MAX_FLOAT;
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65
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66 static this(){
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67 MIN_INTEGER = new Integer(Integer.MIN_VALUE);
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68 MAX_INTEGER = new Integer(Integer.MAX_VALUE);
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69
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70 MIN_DOUBLE = new Double(-Double.MAX_VALUE);
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71 MAX_DOUBLE = new Double(Double.MAX_VALUE);
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72
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73 MIN_LONG = new Long(Long.MIN_VALUE);
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74 MAX_LONG = new Long(Long.MIN_VALUE);
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75
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76 MIN_FLOAT = new Float(-Float.MAX_VALUE);
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77 MAX_FLOAT = new Float(Float.MAX_VALUE);
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78 }
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79
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80 /**
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81 * @param numberFormat
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82 * @param toType
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83 * @param min
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84 * minimum possible value for the type, can be <code>null</code>
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85 * as BigInteger doesn't have bounds
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86 * @param max
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87 * maximum possible value for the type, can be <code>null</code>
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88 * as BigInteger doesn't have bounds
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89 * @param boxedType
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90 * a convenience that allows for the checking against one type
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91 * rather than boxed and unboxed types
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92 */
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93 private this(NumberFormat numberFormat, TypeInfo toType,
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94 Number min, Number max, TypeInfo boxedType) {
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95 super(typeid(StringCls), toType, numberFormat);
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96
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97 this.toType = toType;
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98 this.numberFormat = numberFormat;
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99 this.min = min;
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100 this.max = max;
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101 this.boxedType = boxedType;
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102 }
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103
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104 /**
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105 * Converts the provided <code>fromObject</code> to the requested
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106 * {@link #getToType() to type}.
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107 *
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108 * @see org.eclipse.core.databinding.conversion.IConverter#convert(java.lang.Object)
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109 * @throws IllegalArgumentException
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110 * if the value isn't in the format required by the NumberFormat
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111 * or the value is out of range for the
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112 * {@link #getToType() to type}.
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113 * @throws IllegalArgumentException
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114 * if conversion was not possible
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115 */
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116 public Object convert(Object fromObject) {
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117 StringToNumberParser.ParseResult result = StringToNumberParser.parse(fromObject,
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118 numberFormat, isJavaPrimitive(toType));
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119
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120 if (result.getPosition() !is null) {
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121 // this shouldn't happen in the pipeline as validation should catch
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122 // it but anyone can call convert so we should return a properly
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123 // formatted message in an exception
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124 throw new IllegalArgumentException(StringToNumberParser
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125 .createParseErrorMessage(stringcast(fromObject), result
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126 .getPosition()));
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127 } else if (result.getNumber() is null) {
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128 // if an error didn't occur and the number is null then it's a boxed
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129 // type and null should be returned
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130 return null;
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131 }
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132
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133 /*
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134 * Technically the checks for ranges aren't needed here because the
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135 * validator should have validated this already but we shouldn't assume
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136 * this has occurred.
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137 */
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138 if (typeid(Integer) is (boxedType)) {
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139 if (StringToNumberParser.inIntegerRange(result.getNumber())) {
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140 return new Integer(result.getNumber().intValue());
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141 }
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142 } else if (typeid(Double) is (boxedType)) {
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143 if (StringToNumberParser.inDoubleRange(result.getNumber())) {
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144 return new Double(result.getNumber().doubleValue());
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145 }
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146 } else if (typeid(Long) is (boxedType)) {
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147 if (StringToNumberParser.inLongRange(result.getNumber())) {
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148 return new Long(result.getNumber().longValue());
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149 }
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150 } else if (typeid(Float) is (boxedType)) {
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151 if (StringToNumberParser.inFloatRange(result.getNumber())) {
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152 return new Float(result.getNumber().floatValue());
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153 }
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154 } else if (typeid(BigInteger) is (boxedType)) {
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155 return (new BigDecimal(result.getNumber().doubleValue()))
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156 .toBigInteger();
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157 }
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158
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159 if (min !is null && max !is null) {
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160 throw new IllegalArgumentException(StringToNumberParser
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161 .createOutOfRangeMessage(min, max, numberFormat));
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162 }
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163
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164 /*
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165 * Fail safe. I don't think this could even be thrown but throwing the
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166 * exception is better than returning null and hiding the error.
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167 */
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168 throw new IllegalArgumentException(
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169 Format("Could not convert [{}] to type [{}]", fromObject, toType)); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
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170 }
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171
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172 /**
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173 * @param primitive
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174 * <code>true</code> if the convert to type is an int
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175 * @return to Integer converter for the default locale
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176 */
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177 public static StringToNumberConverter toInteger(bool primitive) {
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178 return toInteger(NumberFormat.getIntegerInstance(), primitive);
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179 }
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180
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181 /**
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182 * @param numberFormat
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183 * @param primitive
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184 * @return to Integer converter with the provided numberFormat
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185 */
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186 public static StringToNumberConverter toInteger(NumberFormat numberFormat,
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187 bool primitive) {
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188 return new StringToNumberConverter(numberFormat,
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189 (primitive) ? Integer.TYPE : typeid(Integer), MIN_INTEGER,
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190 MAX_INTEGER, typeid(Integer));
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191 }
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192
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193 /**
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194 * @param primitive
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195 * <code>true</code> if the convert to type is a double
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196 * @return to Double converter for the default locale
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197 */
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198 public static StringToNumberConverter toDouble(bool primitive) {
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199 return toDouble(NumberFormat.getNumberInstance(), primitive);
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200 }
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201
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202 /**
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203 * @param numberFormat
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204 * @param primitive
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205 * @return to Double converter with the provided numberFormat
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206 */
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207 public static StringToNumberConverter toDouble(NumberFormat numberFormat,
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208 bool primitive) {
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209 return new StringToNumberConverter(numberFormat,
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210 (primitive) ? Double.TYPE : typeid(Double), MIN_DOUBLE,
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211 MAX_DOUBLE, typeid(Double));
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212 }
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213
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214 /**
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215 * @param primitive
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216 * <code>true</code> if the convert to type is a long
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217 * @return to Long converter for the default locale
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218 */
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219 public static StringToNumberConverter toLong(bool primitive) {
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220 return toLong(NumberFormat.getIntegerInstance(), primitive);
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221 }
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222
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223 /**
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224 * @param numberFormat
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225 * @param primitive
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226 * @return to Long converter with the provided numberFormat
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227 */
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228 public static StringToNumberConverter toLong(NumberFormat numberFormat,
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229 bool primitive) {
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230 return new StringToNumberConverter(numberFormat,
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231 (primitive) ? Long.TYPE : typeid(Long), MIN_LONG, MAX_LONG,
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232 typeid(Long));
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233 }
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234
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235 /**
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236 * @param primitive
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237 * <code>true</code> if the convert to type is a float
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238 * @return to Float converter for the default locale
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239 */
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240 public static StringToNumberConverter toFloat(bool primitive) {
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241 return toFloat(NumberFormat.getNumberInstance(), primitive);
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242 }
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243
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244 /**
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245 * @param numberFormat
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246 * @param primitive
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247 * @return to Float converter with the provided numberFormat
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248 */
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249 public static StringToNumberConverter toFloat(NumberFormat numberFormat,
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250 bool primitive) {
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251 return new StringToNumberConverter(numberFormat,
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252 (primitive) ? Float.TYPE : typeid(Float), MIN_FLOAT, MAX_FLOAT,
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253 typeid(Float));
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254 }
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255
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256 /**
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257 * @return to BigInteger converter for the default locale
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258 */
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259 public static StringToNumberConverter toBigInteger() {
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260 return toBigInteger(NumberFormat.getIntegerInstance());
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261 }
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262
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263 /**
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264 * @param numberFormat
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265 * @return to BigInteger converter with the provided numberFormat
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266 */
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267 public static StringToNumberConverter toBigInteger(NumberFormat numberFormat) {
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268 return new StringToNumberConverter(numberFormat, typeid(BigInteger),
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269 null, null, typeid(BigInteger));
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270 }
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271 }
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