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org.apache.commons.validator.routines.BigDecimalValidator |
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1 | /* |
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2 | * $Id: BigDecimalValidator.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.math.BigDecimal; |
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24 | import java.text.Format; |
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25 | import java.text.NumberFormat; |
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26 | import java.util.Locale; |
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27 | ||
28 | /** |
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29 | * <p><b>BigDecimal Validation</b> and Conversion routines (<code>java.math.BigDecimal</code>).</p> |
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30 | * |
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31 | * <p>This validator provides a number of methods for |
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32 | * validating/converting a <code>String</code> value to |
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33 | * a <code>BigDecimal</code> using <code>java.text.NumberFormat</code> |
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34 | * to parse either:</p> |
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35 | * <ul> |
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36 | * <li>using the default format for the default <code>Locale</code></li> |
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37 | * <li>using a specified pattern with the default <code>Locale</code></li> |
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38 | * <li>using the default format for a specified <code>Locale</code></li> |
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39 | * <li>using a specified pattern with a specified <code>Locale</code></li> |
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40 | * </ul> |
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41 | * |
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42 | * <p>Use one of the <code>isValid()</code> methods to just validate or |
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43 | * one of the <code>validate()</code> methods to validate and receive a |
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44 | * <i>converted</i> <code>BigDecimal</code> value.</p> |
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45 | * |
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46 | * <p>Fraction/decimal values are automatically trimmed to the appropriate length.</p> |
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47 | * |
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48 | * <p>Once a value has been sucessfully converted the following |
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49 | * methods can be used to perform minimum, maximum and range checks:</p> |
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50 | * <ul> |
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51 | * <li><code>minValue()</code> checks whether the value is greater |
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52 | * than or equal to a specified minimum.</li> |
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53 | * <li><code>maxValue()</code> checks whether the value is less |
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54 | * than or equal to a specified maximum.</li> |
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55 | * <li><code>isInRange()</code> checks whether the value is within |
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56 | * a specified range of values.</li> |
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57 | * </ul> |
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58 | * |
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59 | * <p>So that the same mechanism used for parsing an <i>input</i> value |
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60 | * for validation can be used to format <i>output</i>, corresponding |
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61 | * <code>format()</code> methods are also provided. That is you can |
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62 | * format either:</p> |
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63 | * <ul> |
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64 | * <li>using the default format for the default <code>Locale</code></li> |
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65 | * <li>using a specified pattern with the default <code>Locale</code></li> |
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66 | * <li>using the default format for a specified <code>Locale</code></li> |
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67 | * <li>using a specified pattern with a specified <code>Locale</code></li> |
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68 | * </ul> |
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69 | * |
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70 | * @version $Revision: 386637 $ $Date: 2006-03-17 13:22:26 +0000 (Fri, 17 Mar 2006) $ |
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71 | * @since Validator 1.3.0 |
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72 | */ |
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73 | public class BigDecimalValidator extends AbstractNumberValidator { |
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74 | ||
75 | 3 | private static final BigDecimalValidator VALIDATOR = new BigDecimalValidator(); |
76 | ||
77 | /** |
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78 | * Return a singleton instance of this validator. |
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79 | * @return A singleton instance of the BigDecimalValidator. |
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80 | */ |
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81 | public static BigDecimalValidator getInstance() { |
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82 | 16 | return VALIDATOR; |
83 | } |
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84 | ||
85 | /** |
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86 | * Construct a <i>strict</i> instance. |
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87 | */ |
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88 | public BigDecimalValidator() { |
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89 | 14 | this(true); |
90 | 14 | } |
91 | ||
92 | /** |
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93 | * <p>Construct an instance with the specified strict setting.</p> |
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94 | * |
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95 | * @param strict <code>true</code> if strict |
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96 | * <code>Format</code> parsing should be used. |
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97 | */ |
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98 | public BigDecimalValidator(boolean strict) { |
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99 | 25 | this(strict, STANDARD_FORMAT, true); |
100 | 25 | } |
101 | ||
102 | /** |
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103 | * <p>Construct an instance with the specified strict setting |
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104 | * and format type.</p> |
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105 | * |
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106 | * <p>The <code>formatType</code> specified what type of |
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107 | * <code>NumberFormat</code> is created - valid types |
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108 | * are:</p> |
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109 | * <ul> |
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110 | * <li>AbstractNumberValidator.STANDARD_FORMAT -to create |
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111 | * <i>standard</i> number formats (the default).</li> |
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112 | * <li>AbstractNumberValidator.CURRENCY_FORMAT -to create |
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113 | * <i>currency</i> number formats.</li> |
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114 | * <li>AbstractNumberValidator.PERCENT_FORMAT -to create |
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115 | * <i>percent</i> number formats (the default).</li> |
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116 | * </ul> |
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117 | * |
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118 | * @param strict <code>true</code> if strict |
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119 | * <code>Format</code> parsing should be used. |
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120 | * @param formatType The <code>NumberFormat</code> type to |
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121 | * create for validation, default is STANDARD_FORMAT. |
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122 | * @param allowFractions <code>true</code> if fractions are |
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123 | * allowed or <code>false</code> if integers only. |
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124 | */ |
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125 | protected BigDecimalValidator(boolean strict, int formatType, |
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126 | boolean allowFractions) { |
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127 | 33 | super(strict, formatType, allowFractions); |
128 | 33 | } |
129 | ||
130 | /** |
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131 | * <p>Validate/convert a <code>BigDecimal</code> using the default |
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132 | * <code>Locale</code>. |
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133 | * |
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134 | * @param value The value validation is being performed on. |
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135 | * @return The parsed <code>BigDecimal</code> if valid or <code>null</code> |
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136 | * if invalid. |
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137 | */ |
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138 | public BigDecimal validate(String value) { |
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139 | 11 | return (BigDecimal)parse(value, (String)null, (Locale)class="keyword">null); |
140 | } |
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141 | ||
142 | /** |
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143 | * <p>Validate/convert a <code>BigDecimal</code> using the |
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144 | * specified <i>pattern</i>. |
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145 | * |
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146 | * @param value The value validation is being performed on. |
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147 | * @param pattern The pattern used to validate the value against, or the |
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148 | * default for the <code>Locale</code> if <code>null</code>. |
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149 | * @return The parsed <code>BigDecimal</code> if valid or <code>null</code> if invalid. |
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150 | */ |
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151 | public BigDecimal validate(String value, String pattern) { |
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152 | 6 | return (BigDecimal)parse(value, pattern, (Locale)null); |
153 | } |
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154 | ||
155 | /** |
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156 | * <p>Validate/convert a <code>BigDecimal</code> using the |
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157 | * specified <code>Locale</code>. |
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158 | * |
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159 | * @param value The value validation is being performed on. |
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160 | * @param locale The locale to use for the number format, system default if null. |
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161 | * @return The parsed <code>BigDecimal</code> if valid or <code>null</code> if invalid. |
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162 | */ |
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163 | public BigDecimal validate(String value, Locale locale) { |
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164 | 24 | return (BigDecimal)parse(value, (String)null, locale); |
165 | } |
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166 | ||
167 | /** |
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168 | * <p>Validate/convert a <code>BigDecimal</code> using the |
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169 | * specified pattern and/ or <code>Locale</code>. |
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170 | * |
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171 | * @param value The value validation is being performed on. |
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172 | * @param pattern The pattern used to validate the value against, or the |
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173 | * default for the <code>Locale</code> if <code>null</code>. |
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174 | * @param locale The locale to use for the date format, system default if null. |
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175 | * @return The parsed <code>BigDecimal</code> if valid or <code>null</code> if invalid. |
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176 | */ |
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177 | public BigDecimal validate(String value, String pattern, Locale locale) { |
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178 | 6 | return (BigDecimal)parse(value, pattern, locale); |
179 | } |
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180 | ||
181 | /** |
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182 | * Check if the value is within a specified range. |
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183 | * |
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184 | * @param value The <code>Number</code> value to check. |
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185 | * @param min The minimum value of the range. |
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186 | * @param max The maximum value of the range. |
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187 | * @return <code>true</code> if the value is within the |
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188 | * specified range. |
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189 | */ |
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190 | public boolean isInRange(BigDecimal value, double min, class="keyword">double max) { |
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191 | 5 | return (value.doubleValue() >= min && value.doubleValue() <= max); |
192 | } |
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193 | ||
194 | /** |
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195 | * Check if the value is greater than or equal to a minimum. |
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196 | * |
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197 | * @param value The value validation is being performed on. |
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198 | * @param min The minimum value. |
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199 | * @return <code>true</code> if the value is greater than |
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200 | * or equal to the minimum. |
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201 | */ |
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202 | public boolean minValue(BigDecimal value, double min) { |
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203 | 3 | return (value.doubleValue() >= min); |
204 | } |
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205 | ||
206 | /** |
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207 | * Check if the value is less than or equal to a maximum. |
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208 | * |
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209 | * @param value The value validation is being performed on. |
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210 | * @param max The maximum value. |
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211 | * @return <code>true</code> if the value is less than |
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212 | * or equal to the maximum. |
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213 | */ |
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214 | public boolean maxValue(BigDecimal value, double max) { |
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215 | 3 | return (value.doubleValue() <= max); |
216 | } |
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217 | ||
218 | /** |
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219 | * Convert the parsed value to a <code>BigDecimal</code>. |
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220 | * |
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221 | * @param value The parsed <code>Number</code> object created. |
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222 | * @param formatter The Format used to parse the value with. |
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223 | * @return The parsed <code>Number</code> converted to a |
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224 | * <code>BigDecimal</code>. |
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225 | */ |
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226 | protected Object processParsedValue(Object value, Format formatter) { |
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227 | 86 | BigDecimal decimal = null; |
228 | 86 | if (value instanceof Long) { |
229 | 26 | decimal = BigDecimal.valueOf(((Long)value).longValue()); |
230 | } else { |
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231 | 60 | decimal = new BigDecimal(value.toString()); |
232 | } |
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233 | ||
234 | 86 | int scale = determineScale((NumberFormat)formatter); |
235 | 86 | if (scale >= 0) { |
236 | 39 | decimal = decimal.setScale(scale, BigDecimal.ROUND_DOWN); |
237 | } |
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238 | ||
239 | 86 | return decimal; |
240 | } |
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241 | } |
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