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17 package org.apache.commons.validator.routines;
18
19 import java.math.BigDecimal;
20 import java.text.Format;
21 import java.text.NumberFormat;
22 import java.util.Locale;
23
24 /***
25 * <p><b>BigDecimal Validation</b> and Conversion routines (<code>java.math.BigDecimal</code>).</p>
26 *
27 * <p>This validator provides a number of methods for
28 * validating/converting a <code>String</code> value to
29 * a <code>BigDecimal</code> using <code>java.text.NumberFormat</code>
30 * to parse either:</p>
31 * <ul>
32 * <li>using the default format for the default <code>Locale</code></li>
33 * <li>using a specified pattern with the default <code>Locale</code></li>
34 * <li>using the default format for a specified <code>Locale</code></li>
35 * <li>using a specified pattern with a specified <code>Locale</code></li>
36 * </ul>
37 *
38 * <p>Use one of the <code>isValid()</code> methods to just validate or
39 * one of the <code>validate()</code> methods to validate and receive a
40 * <i>converted</i> <code>BigDecimal</code> value.</p>
41 *
42 * <p>Fraction/decimal values are automatically trimmed to the appropriate length.</p>
43 *
44 * <p>Once a value has been sucessfully converted the following
45 * methods can be used to perform minimum, maximum and range checks:</p>
46 * <ul>
47 * <li><code>minValue()</code> checks whether the value is greater
48 * than or equal to a specified minimum.</li>
49 * <li><code>maxValue()</code> checks whether the value is less
50 * than or equal to a specified maximum.</li>
51 * <li><code>isInRange()</code> checks whether the value is within
52 * a specified range of values.</li>
53 * </ul>
54 *
55 * <p>So that the same mechanism used for parsing an <i>input</i> value
56 * for validation can be used to format <i>output</i>, corresponding
57 * <code>format()</code> methods are also provided. That is you can
58 * format either:</p>
59 * <ul>
60 * <li>using the default format for the default <code>Locale</code></li>
61 * <li>using a specified pattern with the default <code>Locale</code></li>
62 * <li>using the default format for a specified <code>Locale</code></li>
63 * <li>using a specified pattern with a specified <code>Locale</code></li>
64 * </ul>
65 *
66 * @version $Revision: 478334 $ $Date: 2006-11-22 21:31:54 +0000 (Wed, 22 Nov 2006) $
67 * @since Validator 1.3.0
68 */
69 public class BigDecimalValidator extends AbstractNumberValidator {
70
71 private static final BigDecimalValidator VALIDATOR = new BigDecimalValidator();
72
73 /***
74 * Return a singleton instance of this validator.
75 * @return A singleton instance of the BigDecimalValidator.
76 */
77 public static BigDecimalValidator getInstance() {
78 return VALIDATOR;
79 }
80
81 /***
82 * Construct a <i>strict</i> instance.
83 */
84 public BigDecimalValidator() {
85 this(true);
86 }
87
88 /***
89 * <p>Construct an instance with the specified strict setting.</p>
90 *
91 * @param strict <code>true</code> if strict
92 * <code>Format</code> parsing should be used.
93 */
94 public BigDecimalValidator(boolean strict) {
95 this(strict, STANDARD_FORMAT, true);
96 }
97
98 /***
99 * <p>Construct an instance with the specified strict setting
100 * and format type.</p>
101 *
102 * <p>The <code>formatType</code> specified what type of
103 * <code>NumberFormat</code> is created - valid types
104 * are:</p>
105 * <ul>
106 * <li>AbstractNumberValidator.STANDARD_FORMAT -to create
107 * <i>standard</i> number formats (the default).</li>
108 * <li>AbstractNumberValidator.CURRENCY_FORMAT -to create
109 * <i>currency</i> number formats.</li>
110 * <li>AbstractNumberValidator.PERCENT_FORMAT -to create
111 * <i>percent</i> number formats (the default).</li>
112 * </ul>
113 *
114 * @param strict <code>true</code> if strict
115 * <code>Format</code> parsing should be used.
116 * @param formatType The <code>NumberFormat</code> type to
117 * create for validation, default is STANDARD_FORMAT.
118 * @param allowFractions <code>true</code> if fractions are
119 * allowed or <code>false</code> if integers only.
120 */
121 protected BigDecimalValidator(boolean strict, int formatType,
122 boolean allowFractions) {
123 super(strict, formatType, allowFractions);
124 }
125
126 /***
127 * <p>Validate/convert a <code>BigDecimal</code> using the default
128 * <code>Locale</code>.
129 *
130 * @param value The value validation is being performed on.
131 * @return The parsed <code>BigDecimal</code> if valid or <code>null</code>
132 * if invalid.
133 */
134 public BigDecimal validate(String value) {
135 return (BigDecimal)parse(value, (String)null, (Locale)null);
136 }
137
138 /***
139 * <p>Validate/convert a <code>BigDecimal</code> using the
140 * specified <i>pattern</i>.
141 *
142 * @param value The value validation is being performed on.
143 * @param pattern The pattern used to validate the value against, or the
144 * default for the <code>Locale</code> if <code>null</code>.
145 * @return The parsed <code>BigDecimal</code> if valid or <code>null</code> if invalid.
146 */
147 public BigDecimal validate(String value, String pattern) {
148 return (BigDecimal)parse(value, pattern, (Locale)null);
149 }
150
151 /***
152 * <p>Validate/convert a <code>BigDecimal</code> using the
153 * specified <code>Locale</code>.
154 *
155 * @param value The value validation is being performed on.
156 * @param locale The locale to use for the number format, system default if null.
157 * @return The parsed <code>BigDecimal</code> if valid or <code>null</code> if invalid.
158 */
159 public BigDecimal validate(String value, Locale locale) {
160 return (BigDecimal)parse(value, (String)null, locale);
161 }
162
163 /***
164 * <p>Validate/convert a <code>BigDecimal</code> using the
165 * specified pattern and/ or <code>Locale</code>.
166 *
167 * @param value The value validation is being performed on.
168 * @param pattern The pattern used to validate the value against, or the
169 * default for the <code>Locale</code> if <code>null</code>.
170 * @param locale The locale to use for the date format, system default if null.
171 * @return The parsed <code>BigDecimal</code> if valid or <code>null</code> if invalid.
172 */
173 public BigDecimal validate(String value, String pattern, Locale locale) {
174 return (BigDecimal)parse(value, pattern, locale);
175 }
176
177 /***
178 * Check if the value is within a specified range.
179 *
180 * @param value The <code>Number</code> value to check.
181 * @param min The minimum value of the range.
182 * @param max The maximum value of the range.
183 * @return <code>true</code> if the value is within the
184 * specified range.
185 */
186 public boolean isInRange(BigDecimal value, double min, double max) {
187 return (value.doubleValue() >= min && value.doubleValue() <= max);
188 }
189
190 /***
191 * Check if the value is greater than or equal to a minimum.
192 *
193 * @param value The value validation is being performed on.
194 * @param min The minimum value.
195 * @return <code>true</code> if the value is greater than
196 * or equal to the minimum.
197 */
198 public boolean minValue(BigDecimal value, double min) {
199 return (value.doubleValue() >= min);
200 }
201
202 /***
203 * Check if the value is less than or equal to a maximum.
204 *
205 * @param value The value validation is being performed on.
206 * @param max The maximum value.
207 * @return <code>true</code> if the value is less than
208 * or equal to the maximum.
209 */
210 public boolean maxValue(BigDecimal value, double max) {
211 return (value.doubleValue() <= max);
212 }
213
214 /***
215 * Convert the parsed value to a <code>BigDecimal</code>.
216 *
217 * @param value The parsed <code>Number</code> object created.
218 * @param formatter The Format used to parse the value with.
219 * @return The parsed <code>Number</code> converted to a
220 * <code>BigDecimal</code>.
221 */
222 protected Object processParsedValue(Object value, Format formatter) {
223 BigDecimal decimal = null;
224 if (value instanceof Long) {
225 decimal = BigDecimal.valueOf(((Long)value).longValue());
226 } else {
227 decimal = new BigDecimal(value.toString());
228 }
229
230 int scale = determineScale((NumberFormat)formatter);
231 if (scale >= 0) {
232 decimal = decimal.setScale(scale, BigDecimal.ROUND_DOWN);
233 }
234
235 return decimal;
236 }
237 }