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org.apache.commons.validator.routines.CurrencyValidator |
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1 | /* |
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2 | * $Id: CurrencyValidator.java 386637 2006-03-17 13:22:26Z niallp $ |
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3 | * $Revision: 386637 $ |
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4 | * $Date: 2006-03-17 13:22:26 +0000 (Fri, 17 Mar 2006) $ |
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5 | * |
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6 | * ==================================================================== |
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7 | * Copyright 2006 The Apache Software Foundation |
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8 | * |
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9 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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10 | * you may not use this file except in compliance with the License. |
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11 | * You may obtain a copy of the License at |
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12 | * |
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13 | * http://www.apache.org/licenses/LICENSE-2.0 |
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14 | * |
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15 | * Unless required by applicable law or agreed to in writing, software |
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16 | * distributed under the License is distributed on an "AS IS" BASIS, |
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17 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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18 | * See the License for the specific language governing permissions and |
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19 | * limitations under the License. |
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20 | */ |
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21 | package org.apache.commons.validator.routines; |
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22 | ||
23 | import java.text.DecimalFormat; |
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24 | import java.text.Format; |
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25 | ||
26 | /** |
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27 | * <p><b>Currency Validation</b> and Conversion routines (<code>java.math.BigDecimal</code>).</p> |
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28 | * |
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29 | * <p>This is one implementation of a currency validator that has the following features:</p> |
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30 | * <ul> |
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31 | * <li>It is <i>lenient</i> about the the presence of the <i>currency symbol</i></li> |
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32 | * <li>It converts the currency to a <code>java.math.BigDecimal</code></li> |
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33 | * </ul> |
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34 | * |
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35 | * <p>However any of the <i>number</i> validators can be used for <i>currency</i> validation. |
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36 | * For example, if you wanted a <i>currency</i> validator that converts to a |
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37 | * <code>java.lang.Integer</code> then you can simply instantiate an |
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38 | * <code>IntegerValidator</code> with the appropriate <i>format type</i>:</p> |
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39 | * |
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40 | * <p><code>... = new IntegerValidator(false, IntegerValidator.CURRENCY_FORMAT);</code></p> |
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41 | * |
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42 | * <p>Pick the appropriate validator, depending on the type (e.g Float, Double, Integer, Long etc) |
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43 | * you want the currency converted to. One thing to note - only the CurrencyValidator |
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44 | * implements <i>lenient</i> behaviour regarding the currency symbol.</p> |
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45 | * |
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46 | * @version $Revision: 386637 $ $Date: 2006-03-17 13:22:26 +0000 (Fri, 17 Mar 2006) $ |
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47 | * @since Validator 1.3.0 |
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48 | */ |
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49 | public class CurrencyValidator extends BigDecimalValidator { |
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50 | ||
51 | 1 | private static final CurrencyValidator VALIDATOR = new CurrencyValidator(); |
52 | ||
53 | /** DecimalFormat's currency symbol */ |
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54 | private static final char CURRENCY_SYMBOL = '\u00A4'; |
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55 | ||
56 | /** |
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57 | * Return a singleton instance of this validator. |
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58 | * @return A singleton instance of the CurrencyValidator. |
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59 | */ |
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60 | public static BigDecimalValidator getInstance() { |
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61 | 5 | return VALIDATOR; |
62 | } |
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63 | ||
64 | /** |
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65 | * Construct a <i>strict</i> instance. |
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66 | */ |
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67 | public CurrencyValidator() { |
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68 | 2 | this(true, class="keyword">true); |
69 | 2 | } |
70 | ||
71 | /** |
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72 | * Construct an instance with the specified strict setting. |
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73 | * |
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74 | * @param strict <code>true</code> if strict |
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75 | * <code>Format</code> parsing should be used. |
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76 | * @param allowFractions <code>true</code> if fractions are |
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77 | * allowed or <code>false</code> if integers only. |
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78 | */ |
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79 | public CurrencyValidator(boolean strict, class="keyword">boolean allowFractions) { |
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80 | 3 | super(strict, CURRENCY_FORMAT, allowFractions); |
81 | 3 | } |
82 | ||
83 | /** |
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84 | * <p>Parse the value with the specified <code>Format</code>.</p> |
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85 | * |
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86 | * <p>This implementation is lenient whether the currency symbol |
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87 | * is present or not. The default <code>NumberFormat</code> |
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88 | * behaviour is for the parsing to "fail" if the currency |
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89 | * symbol is missing. This method re-parses with a format |
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90 | * without the currency symbol if it fails initially.</p> |
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91 | * |
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92 | * @param value The value to be parsed. |
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93 | * @param formatter The Format to parse the value with. |
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94 | * @return The parsed value if valid or <code>null</code> if invalid. |
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95 | */ |
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96 | protected Object parse(String value, Format formatter) { |
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97 | ||
98 | // Initial parse of the value |
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99 | 36 | Object parsedValue = super.parse(value, formatter); |
100 | 36 | if (parsedValue != null || !(formatter instanceof DecimalFormat)) { |
101 | 20 | return parsedValue; |
102 | } |
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103 | ||
104 | // Re-parse using a pattern without the currency symbol |
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105 | 16 | DecimalFormat decimalFormat = (DecimalFormat)formatter; |
106 | 16 | String pattern = decimalFormat.toPattern(); |
107 | 16 | if (pattern.indexOf(CURRENCY_SYMBOL) >= 0) { |
108 | 16 | StringBuffer buffer = new StringBuffer(pattern.length()); |
109 | 304 | for (int i = 0; i < pattern.length(); i++) { |
110 | 288 | if (pattern.charAt(i) != CURRENCY_SYMBOL) { |
111 | 261 | buffer.append(pattern.charAt(i)); |
112 | } |
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113 | } |
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114 | 16 | decimalFormat.applyPattern(buffer.toString()); |
115 | 16 | parsedValue = super.parse(value, decimalFormat); |
116 | } |
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117 | 16 | return parsedValue; |
118 | } |
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119 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |