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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
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14 import java.lang.all;
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15
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16 import org.eclipse.core.databinding.conversion.Converter;
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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 * Base class for number to number converters.
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22 * <p>
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23 * This class is thread safe.
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24 * </p>
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25 *
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26 * @since 1.0
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27 */
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28 public abstract class NumberToNumberConverter : Converter {
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29 private NumberFormat numberFormat;
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30
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31 private bool primitive;
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32
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33 private String outOfRangeMessage;
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34
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35 protected this(NumberFormat numberFormat,
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36 ClassInfo fromType, ClassInfo toType) {
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37 super(fromType, toType);
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38 this.numberFormat = numberFormat;
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39 this.primitive = toType.isPrimitive();
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40 }
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41
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42 /*
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43 * (non-Javadoc)
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44 *
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45 * @see org.eclipse.core.databinding.conversion.IConverter#convert(java.lang.Object)
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46 */
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47 public final Object convert(Object fromObject) {
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48 if (fromObject is null) {
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49 if (primitive) {
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50 throw new IllegalArgumentException(
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51 "Parameter 'fromObject' cannot be null."); //$NON-NLS-1$
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52 }
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53
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54 return null;
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55 }
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56
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57 if (!( null !is cast(Number)fromObject )) {
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58 throw new IllegalArgumentException(
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59 "Parameter 'fromObject' must be of type Number."); //$NON-NLS-1$
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60 }
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61
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62 Number number = cast(Number) fromObject;
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63 Number result = doConvert(number);
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64
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65 if (result !is null) {
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66 return result;
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67 }
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68
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69 synchronized (this) {
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70 if (outOfRangeMessage is null) {
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71 outOfRangeMessage = StringToNumberParser
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72 .createOutOfRangeMessage(new Shortcast(Short.MIN_VALUE),
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73 new Shortcast(Short.MAX_VALUE), numberFormat);
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74 }
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75
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76 throw new IllegalArgumentException(outOfRangeMessage);
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77 }
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78 }
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79
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80 /**
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81 * Invoked when the number should converted.
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82 *
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83 * @param number
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84 * @return number if conversion was successfule, <code>null</code> if the
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85 * number was out of range
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86 */
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87 protected abstract Number doConvert(Number number);
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88
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89 /**
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90 * NumberFormat being used by the converter. Access to the format must be
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91 * synchronized on the number format instance.
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92 *
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93 * @return number format
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94 */
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95 public NumberFormat getNumberFormat() {
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96 return numberFormat;
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97 }
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98 }
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