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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.internal.databinding.conversion.NumberToNumberConverter;
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13 import org.eclipse.core.internal.databinding.conversion.StringToNumberParser;
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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 org.eclipse.core.databinding.conversion.Converter;
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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 * Base class for number to number converters.
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24 * <p>
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25 * This class is thread safe.
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26 * </p>
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27 *
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28 * @since 1.0
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29 */
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30 public abstract class NumberToNumberConverter : Converter {
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31 private NumberFormat numberFormat;
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32
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33 private bool primitive;
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34
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35 private String outOfRangeMessage;
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36
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37 protected this(NumberFormat numberFormat,
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38 TypeInfo fromType, TypeInfo toType) {
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39 super(fromType, toType);
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40 this.numberFormat = numberFormat;
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41 this.primitive = isJavaPrimitive(toType);
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42 }
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43
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44 /*
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45 * (non-Javadoc)
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46 *
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47 * @see org.eclipse.core.databinding.conversion.IConverter#convert(java.lang.Object)
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48 */
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49 // DWT not final, need to override to reimplement interface IConvert
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50 public /+final+/ Object convert(Object fromObject) {
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51 if (fromObject is null) {
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52 if (primitive) {
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53 throw new IllegalArgumentException(
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54 "Parameter 'fromObject' cannot be null."); //$NON-NLS-1$
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55 }
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56
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57 return null;
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58 }
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59
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60 if (!( null !is cast(Number)fromObject )) {
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61 throw new IllegalArgumentException(
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62 "Parameter 'fromObject' must be of type Number."); //$NON-NLS-1$
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63 }
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64
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65 Number number = cast(Number) fromObject;
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66 Number result = doConvert(number);
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67
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68 if (result !is null) {
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69 return result;
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70 }
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71
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72 synchronized (this) {
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73 if (outOfRangeMessage is null) {
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74 outOfRangeMessage = StringToNumberParser
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75 .createOutOfRangeMessage(new Short(Short.MIN_VALUE),
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76 new Short(Short.MAX_VALUE), numberFormat);
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77 }
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79 throw new IllegalArgumentException(outOfRangeMessage);
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80 }
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81 }
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82
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83 /**
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84 * Invoked when the number should converted.
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85 *
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86 * @param number
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87 * @return number if conversion was successfule, <code>null</code> if the
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88 * number was out of range
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89 */
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90 protected abstract Number doConvert(Number number);
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91
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92 /**
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93 * NumberFormat being used by the converter. Access to the format must be
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94 * synchronized on the number format instance.
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95 *
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96 * @return number format
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97 */
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98 public NumberFormat getNumberFormat() {
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99 return numberFormat;
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100 }
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101 }
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