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| org.apache.commons.validator.routines.PercentValidator |
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| 1 | /* |
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| 2 | * $Id: PercentValidator.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 | import java.math.BigDecimal; |
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| 26 | ||
| 27 | /** |
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| 28 | * <p><b>Percentage Validation</b> and Conversion routines (<code>java.math.BigDecimal</code>).</p> |
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| 29 | * |
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| 30 | * <p>This is one implementation of a percent validator that has the following features:</p> |
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| 31 | * <ul> |
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| 32 | * <li>It is <i>lenient</i> about the the presence of the <i>percent symbol</i></li> |
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| 33 | * <li>It converts the percent to a <code>java.math.BigDecimal</code></li> |
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| 34 | * </ul> |
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| 35 | * |
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| 36 | * <p>However any of the <i>number</i> validators can be used for <i>percent</i> validation. |
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| 37 | * For example, if you wanted a <i>percent</i> validator that converts to a |
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| 38 | * <code>java.lang.Float</code> then you can simply instantiate an |
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| 39 | * <code>FloatValidator</code> with the appropriate <i>format type</i>:</p> |
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| 40 | * |
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| 41 | * <p><code>... = new FloatValidator(false, FloatValidator.PERCENT_FORMAT);</code></p> |
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| 42 | * |
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| 43 | * <p>Pick the appropriate validator, depending on the type (i.e Float, Double or BigDecimal) |
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| 44 | * you want the percent converted to. Please note, it makes no sense to use |
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| 45 | * one of the validators that doesn't handle fractions (i.e. byte, short, integer, long |
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| 46 | * and BigInteger) since percentages are converted to fractions (i.e <code>50%</code> is |
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| 47 | * converted to <code>0.5</code>).</p> |
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| 48 | * |
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| 49 | * @version $Revision: 386637 $ $Date: 2006-03-17 13:22:26 +0000 (Fri, 17 Mar 2006) $ |
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| 50 | * @since Validator 1.3.0 |
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| 51 | */ |
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| 52 | public class PercentValidator extends BigDecimalValidator { |
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| 53 | ||
| 54 | 2 | private static final PercentValidator VALIDATOR = new PercentValidator(); |
| 55 | ||
| 56 | /** DecimalFormat's percent (thousand multiplier) symbol */ |
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| 57 | private static final char PERCENT_SYMBOL = '%'; |
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| 58 | ||
| 59 | 1 | private static final BigDecimal POINT_ZERO_ONE = new BigDecimal("0.01"); |
| 60 | ||
| 61 | /** |
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| 62 | * Return a singleton instance of this validator. |
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| 63 | * @return A singleton instance of the PercentValidator. |
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| 64 | */ |
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| 65 | public static BigDecimalValidator getInstance() { |
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| 66 | 4 | return VALIDATOR; |
| 67 | } |
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| 68 | ||
| 69 | /** |
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| 70 | * Construct a <i>strict</i> instance. |
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| 71 | */ |
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| 72 | public PercentValidator() { |
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| 73 | 4 | this(true); |
| 74 | 4 | } |
| 75 | ||
| 76 | /** |
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| 77 | * Construct an instance with the specified strict setting. |
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| 78 | * |
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| 79 | * @param strict <code>true</code> if strict |
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| 80 | * <code>Format</code> parsing should be used. |
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| 81 | */ |
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| 82 | public PercentValidator(boolean strict) { |
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| 83 | 4 | super(strict, PERCENT_FORMAT, true); |
| 84 | 4 | } |
| 85 | ||
| 86 | /** |
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| 87 | * <p>Parse the value with the specified <code>Format</code>.</p> |
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| 88 | * |
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| 89 | * <p>This implementation is lenient whether the currency symbol |
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| 90 | * is present or not. The default <code>NumberFormat</code> |
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| 91 | * behaviour is for the parsing to "fail" if the currency |
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| 92 | * symbol is missing. This method re-parses with a format |
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| 93 | * without the currency symbol if it fails initially.</p> |
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| 94 | * |
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| 95 | * @param value The value to be parsed. |
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| 96 | * @param formatter The Format to parse the value with. |
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| 97 | * @return The parsed value if valid or <code>null</code> if invalid. |
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| 98 | */ |
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| 99 | protected Object parse(String value, Format formatter) { |
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| 100 | ||
| 101 | // Initial parse of the value |
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| 102 | 13 | BigDecimal parsedValue = (BigDecimal)super.parse(value, formatter); |
| 103 | 13 | if (parsedValue != null || !(formatter instanceof DecimalFormat)) { |
| 104 | 7 | return parsedValue; |
| 105 | } |
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| 106 | ||
| 107 | // Re-parse using a pattern without the percent symbol |
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| 108 | 6 | DecimalFormat decimalFormat = (DecimalFormat)formatter; |
| 109 | 6 | String pattern = decimalFormat.toPattern(); |
| 110 | 6 | if (pattern.indexOf(PERCENT_SYMBOL) >= 0) { |
| 111 | 6 | StringBuffer buffer = new StringBuffer(pattern.length()); |
| 112 | 42 | for (int i = 0; i < pattern.length(); i++) { |
| 113 | 36 | if (pattern.charAt(i) != PERCENT_SYMBOL) { |
| 114 | 30 | buffer.append(pattern.charAt(i)); |
| 115 | } |
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| 116 | } |
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| 117 | 6 | decimalFormat.applyPattern(buffer.toString()); |
| 118 | 6 | parsedValue = (BigDecimal)super.parse(value, decimalFormat); |
| 119 | ||
| 120 | // If parsed OK, divide by 100 to get percent |
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| 121 | 6 | if (parsedValue != null) { |
| 122 | 2 | parsedValue = parsedValue.multiply(POINT_ZERO_ONE); |
| 123 | } |
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| 124 | ||
| 125 | } |
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| 126 | 6 | return parsedValue; |
| 127 | } |
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| 128 | } |
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