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org.apache.commons.validator.routines.DateValidator |
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1 | /* |
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2 | * $Id: DateValidator.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.DateFormat; |
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24 | import java.text.Format; |
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25 | import java.util.Calendar; |
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26 | import java.util.Date; |
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27 | import java.util.Locale; |
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28 | import java.util.TimeZone; |
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29 | ||
30 | /** |
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31 | * <p><b>Date Validation</b> and Conversion routines (<code>java.util.Date</code>).</p> |
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32 | * |
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33 | * <p>This validator provides a number of methods for validating/converting |
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34 | * a <code>String</code> date value to a <code>java.util.Date</code> using |
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35 | * <code>java.text.DateFormat</code> to parse either:</p> |
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36 | * <ul> |
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37 | * <li>using the default format for the default <code>Locale</code></li> |
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38 | * <li>using a specified pattern with the default <code>Locale</code></li> |
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39 | * <li>using the default format for a specified <code>Locale</code></li> |
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40 | * <li>using a specified pattern with a specified <code>Locale</code></li> |
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41 | * </ul> |
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42 | * |
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43 | * <p>For each of the above mechanisms, conversion method (i.e the |
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44 | * <code>validate</code> methods) implementations are provided which |
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45 | * either use the default <code>TimeZone</code> or allow the |
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46 | * <code>TimeZone</code> to be specified.</p> |
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47 | * |
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48 | * <p>Use one of the <code>isValid()</code> methods to just validate or |
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49 | * one of the <code>validate()</code> methods to validate and receive a |
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50 | * <i>converted</i> <code>Date</code> value.</p> |
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51 | * |
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52 | * <p>Implementations of the <code>validate()</code> method are provided |
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53 | * to create <code>Date</code> objects for different <i>time zones</i> |
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54 | * if the system default is not appropriate.</p> |
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55 | * |
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56 | * <p>Once a value has been sucessfully converted the following |
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57 | * methods can be used to perform various date comparison checks:</p> |
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58 | * <ul> |
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59 | * <li><code>compareDates()</code> compares the day, month and |
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60 | * year of two dates, returing 0, -1 or +1 indicating |
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61 | * whether the first date is equal, before or after the second.</li> |
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62 | * <li><code>compareWeeks()</code> compares the week and |
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63 | * year of two dates, returing 0, -1 or +1 indicating |
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64 | * whether the first week is equal, before or after the second.</li> |
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65 | * <li><code>compareMonths()</code> compares the month and |
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66 | * year of two dates, returing 0, -1 or +1 indicating |
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67 | * whether the first month is equal, before or after the second.</li> |
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68 | * <li><code>compareQuarters()</code> compares the quarter and |
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69 | * year of two dates, returing 0, -1 or +1 indicating |
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70 | * whether the first quarter is equal, before or after the second.</li> |
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71 | * <li><code>compareYears()</code> compares the |
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72 | * year of two dates, returing 0, -1 or +1 indicating |
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73 | * whether the first year is equal, before or after the second.</li> |
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74 | * </ul> |
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75 | * |
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76 | * <p>So that the same mechanism used for parsing an <i>input</i> value |
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77 | * for validation can be used to format <i>output</i>, corresponding |
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78 | * <code>format()</code> methods are also provided. That is you can |
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79 | * format either:</p> |
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80 | * <ul> |
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81 | * <li>using a specified pattern</li> |
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82 | * <li>using the format for a specified <code>Locale</code></li> |
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83 | * <li>using the format for the <i>default</i> <code>Locale</code></li> |
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84 | * </ul> |
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85 | * |
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86 | * @version $Revision: 386637 $ $Date: 2006-03-17 13:22:26 +0000 (Fri, 17 Mar 2006) $ |
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87 | * @since Validator 1.3.0 |
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88 | */ |
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89 | public class DateValidator extends AbstractCalendarValidator { |
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90 | ||
91 | 1 | private static final DateValidator VALIDATOR = new DateValidator(); |
92 | ||
93 | /** |
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94 | * Return a singleton instance of this validator. |
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95 | * @return A singleton instance of the DateValidator. |
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96 | */ |
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97 | public static DateValidator getInstance() { |
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98 | 20 | return VALIDATOR; |
99 | } |
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100 | ||
101 | /** |
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102 | * Construct a <i>strict</i> instance with <i>short</i> |
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103 | * date style. |
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104 | */ |
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105 | public DateValidator() { |
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106 | 8 | this(true, DateFormat.SHORT); |
107 | 8 | } |
108 | ||
109 | /** |
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110 | * Construct an instance with the specified <i>strict</i> |
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111 | * and <i>date style</i> parameters. |
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112 | * |
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113 | * @param strict <code>true</code> if strict |
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114 | * <code>Format</code> parsing should be used. |
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115 | * @param dateStyle the date style to use for Locale validation. |
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116 | */ |
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117 | public DateValidator(boolean strict, int dateStyle) { |
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118 | 8 | super(strict, dateStyle, -1); |
119 | 8 | } |
120 | ||
121 | /** |
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122 | * <p>Validate/convert a <code>Date</code> using the default |
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123 | * <code>Locale</code> and <code>TimeZone</code>. |
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124 | * |
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125 | * @param value The value validation is being performed on. |
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126 | * @return The parsed <code>Date</code> if valid or <code>null</code> |
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127 | * if invalid. |
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128 | */ |
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129 | public Date validate(String value) { |
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130 | 2 | return (Date)parse(value, (String)null, (Locale)class="keyword">null, (TimeZone)class="keyword">null); |
131 | } |
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132 | ||
133 | /** |
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134 | * <p>Validate/convert a <code>Date</code> using the specified |
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135 | * <code>TimeZone</code> and default <code>Locale</code>. |
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136 | * |
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137 | * @param value The value validation is being performed on. |
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138 | * @param timeZone The Time Zone used to parse the date, system default if null. |
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139 | * @return The parsed <code>Date</code> if valid or <code>null</code> if invalid. |
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140 | */ |
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141 | public Date validate(String value, TimeZone timeZone) { |
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142 | 1 | return (Date)parse(value, (String)null, (Locale)class="keyword">null, timeZone); |
143 | } |
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144 | ||
145 | /** |
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146 | * <p>Validate/convert a <code>Date</code> using the specified |
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147 | * <i>pattern</i> and default <code>TimeZone</code>. |
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148 | * |
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149 | * @param value The value validation is being performed on. |
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150 | * @param pattern The pattern used to validate the value against, or the |
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151 | * default for the <code>Locale</code> if <code>null</code>. |
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152 | * @return The parsed <code>Date</code> if valid or <code>null</code> if invalid. |
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153 | */ |
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154 | public Date validate(String value, String pattern) { |
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155 | 2 | return (Date)parse(value, pattern, (Locale)null, (TimeZone)class="keyword">null); |
156 | } |
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157 | ||
158 | /** |
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159 | * <p>Validate/convert a <code>Date</code> using the specified |
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160 | * <i>pattern</i> and <code>TimeZone</code>. |
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161 | * |
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162 | * @param value The value validation is being performed on. |
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163 | * @param pattern The pattern used to validate the value against, or the |
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164 | * default for the <code>Locale</code> if <code>null</code>. |
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165 | * @param timeZone The Time Zone used to parse the date, system default if null. |
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166 | * @return The parsed <code>Date</code> if valid or <code>null</code> if invalid. |
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167 | */ |
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168 | public Date validate(String value, String pattern, TimeZone timeZone) { |
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169 | 1 | return (Date)parse(value, pattern, (Locale)null, timeZone); |
170 | } |
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171 | ||
172 | /** |
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173 | * <p>Validate/convert a <code>Date</code> using the specified |
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174 | * <code>Locale</code> and default <code>TimeZone</code>. |
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175 | * |
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176 | * @param value The value validation is being performed on. |
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177 | * @param locale The locale to use for the date format, system default if null. |
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178 | * @return The parsed <code>Date</code> if valid or <code>null</code> if invalid. |
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179 | */ |
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180 | public Date validate(String value, Locale locale) { |
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181 | 2 | return (Date)parse(value, (String)null, locale, (TimeZone)class="keyword">null); |
182 | } |
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183 | ||
184 | /** |
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185 | * <p>Validate/convert a <code>Date</code> using the specified |
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186 | * <code>Locale</code> and <code>TimeZone</code>. |
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187 | * |
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188 | * @param value The value validation is being performed on. |
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189 | * @param locale The locale to use for the date format, system default if null. |
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190 | * @param timeZone The Time Zone used to parse the date, system default if null. |
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191 | * @return The parsed <code>Date</code> if valid or <code>null</code> if invalid. |
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192 | */ |
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193 | public Date validate(String value, Locale locale, TimeZone timeZone) { |
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194 | 1 | return (Date)parse(value, (String)null, locale, timeZone); |
195 | } |
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196 | ||
197 | /** |
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198 | * <p>Validate/convert a <code>Date</code> using the specified pattern |
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199 | * and <code>Locale</code> and the default <code>TimeZone</code>. |
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200 | * |
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201 | * @param value The value validation is being performed on. |
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202 | * @param pattern The pattern used to validate the value against, or the |
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203 | * default for the <code>Locale</code> if <code>null</code>. |
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204 | * @param locale The locale to use for the date format, system default if null. |
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205 | * @return The parsed <code>Date</code> if valid or <code>null</code> if invalid. |
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206 | */ |
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207 | public Date validate(String value, String pattern, Locale locale) { |
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208 | 2 | return (Date)parse(value, pattern, locale, (TimeZone)null); |
209 | } |
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210 | ||
211 | /** |
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212 | * <p>Validate/convert a <code>Date</code> using the specified |
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213 | * pattern, and <code>Locale</code> and <code>TimeZone</code>. |
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214 | * |
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215 | * @param value The value validation is being performed on. |
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216 | * @param pattern The pattern used to validate the value against, or the |
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217 | * default for the <code>Locale</code> if <code>null</code>. |
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218 | * @param locale The locale to use for the date format, system default if null. |
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219 | * @param timeZone The Time Zone used to parse the date, system default if null. |
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220 | * @return The parsed <code>Date</code> if valid or <code>null</code> if invalid. |
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221 | */ |
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222 | public Date validate(String value, String pattern, Locale locale, TimeZone timeZone) { |
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223 | 1 | return (Date)parse(value, pattern, locale, timeZone); |
224 | } |
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225 | ||
226 | /** |
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227 | * <p>Compare Dates (day, month and year - not time).</p> |
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228 | * |
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229 | * @param value The <code>Calendar</code> value to check. |
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230 | * @param compare The <code>Calendar</code> to compare the value to. |
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231 | * @param timeZone The Time Zone used to compare the dates, system default if null. |
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232 | * @return Zero if the dates are equal, -1 if first |
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233 | * date is less than the seconds and +1 if the first |
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234 | * date is greater than. |
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235 | */ |
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236 | public int compareDates(Date value, Date compare, TimeZone timeZone) { |
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237 | 7 | Calendar calendarValue = getCalendar(value, timeZone); |
238 | 7 | Calendar calendarCompare = getCalendar(compare, timeZone); |
239 | 7 | return compare(calendarValue, calendarCompare, Calendar.DATE); |
240 | } |
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241 | ||
242 | /** |
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243 | * <p>Compare Weeks (week and year).</p> |
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244 | * |
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245 | * @param value The <code>Date</code> value to check. |
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246 | * @param compare The <code>Date</code> to compare the value to. |
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247 | * @param timeZone The Time Zone used to compare the dates, system default if null. |
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248 | * @return Zero if the weeks are equal, -1 if first |
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249 | * parameter's week is less than the seconds and +1 if the first |
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250 | * parameter's week is greater than. |
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251 | */ |
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252 | public int compareWeeks(Date value, Date compare, TimeZone timeZone) { |
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253 | 5 | Calendar calendarValue = getCalendar(value, timeZone); |
254 | 5 | Calendar calendarCompare = getCalendar(compare, timeZone); |
255 | 5 | return compare(calendarValue, calendarCompare, Calendar.WEEK_OF_YEAR); |
256 | } |
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257 | ||
258 | /** |
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259 | * <p>Compare Months (month and year).</p> |
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260 | * |
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261 | * @param value The <code>Date</code> value to check. |
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262 | * @param compare The <code>Date</code> to compare the value to. |
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263 | * @param timeZone The Time Zone used to compare the dates, system default if null. |
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264 | * @return Zero if the months are equal, -1 if first |
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265 | * parameter's month is less than the seconds and +1 if the first |
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266 | * parameter's month is greater than. |
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267 | */ |
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268 | public int compareMonths(Date value, Date compare, TimeZone timeZone) { |
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269 | 5 | Calendar calendarValue = getCalendar(value, timeZone); |
270 | 5 | Calendar calendarCompare = getCalendar(compare, timeZone); |
271 | 5 | return compare(calendarValue, calendarCompare, Calendar.MONTH); |
272 | } |
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273 | ||
274 | /** |
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275 | * <p>Compare Quarters (quarter and year).</p> |
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276 | * |
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277 | * @param value The <code>Date</code> value to check. |
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278 | * @param compare The <code>Date</code> to compare the value to. |
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279 | * @param timeZone The Time Zone used to compare the dates, system default if null. |
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280 | * @return Zero if the months are equal, -1 if first |
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281 | * parameter's quarter is less than the seconds and +1 if the first |
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282 | * parameter's quarter is greater than. |
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283 | */ |
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284 | public int compareQuarters(Date value, Date compare, TimeZone timeZone) { |
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285 | 6 | return compareQuarters(value, compare, timeZone, 1); |
286 | } |
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287 | ||
288 | /** |
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289 | * <p>Compare Quarters (quarter and year).</p> |
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290 | * |
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291 | * @param value The <code>Date</code> value to check. |
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292 | * @param compare The <code>Date</code> to compare the value to. |
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293 | * @param timeZone The Time Zone used to compare the dates, system default if null. |
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294 | * @param monthOfFirstQuarter The month that the first quarter starts. |
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295 | * @return Zero if the quarters are equal, -1 if first |
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296 | * parameter's quarter is less than the seconds and +1 if the first |
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297 | * parameter's quarter is greater than. |
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298 | */ |
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299 | public int compareQuarters(Date value, Date compare, TimeZone timeZone, class="keyword">int monthOfFirstQuarter) { |
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300 | 13 | Calendar calendarValue = getCalendar(value, timeZone); |
301 | 13 | Calendar calendarCompare = getCalendar(compare, timeZone); |
302 | 13 | return super.compareQuarters(calendarValue, calendarCompare, monthOfFirstQuarter); |
303 | } |
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304 | ||
305 | /** |
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306 | * <p>Compare Years.</p> |
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307 | * |
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308 | * @param value The <code>Date</code> value to check. |
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309 | * @param compare The <code>Date</code> to compare the value to. |
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310 | * @param timeZone The Time Zone used to compare the dates, system default if null. |
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311 | * @return Zero if the years are equal, -1 if first |
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312 | * parameter's year is less than the seconds and +1 if the first |
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313 | * parameter's year is greater than. |
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314 | */ |
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315 | public int compareYears(Date value, Date compare, TimeZone timeZone) { |
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316 | 3 | Calendar calendarValue = getCalendar(value, timeZone); |
317 | 3 | Calendar calendarCompare = getCalendar(compare, timeZone); |
318 | 3 | return compare(calendarValue, calendarCompare, Calendar.YEAR); |
319 | } |
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320 | ||
321 | /** |
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322 | * <p>Returns the parsed <code>Date</code> unchanged.</p> |
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323 | * |
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324 | * @param value The parsed <code>Date</code> object created. |
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325 | * @param formatter The Format used to parse the value with. |
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326 | * @return The parsed value converted to a <code>Calendar</code>. |
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327 | */ |
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328 | protected Object processParsedValue(Object value, Format formatter) { |
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329 | 41 | return value; |
330 | } |
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331 | ||
332 | /** |
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333 | * <p>Convert a <code>Date</code> to a <code>Calendar</code>.</p> |
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334 | * |
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335 | * @param value The date value to be converted. |
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336 | * @return The converted <code>Calendar</code>. |
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337 | */ |
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338 | private Calendar getCalendar(Date value, TimeZone timeZone) { |
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339 | ||
340 | 66 | Calendar calendar = null; |
341 | 66 | if (timeZone != null) { |
342 | 8 | calendar = Calendar.getInstance(timeZone); |
343 | } else { |
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344 | 58 | calendar = Calendar.getInstance(); |
345 | } |
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346 | 66 | calendar.setTime(value); |
347 | 66 | return calendar; |
348 | ||
349 | } |
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350 | ||
351 | } |
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