001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.validator.routines;
018
019import java.math.BigDecimal;
020import java.text.Format;
021import java.text.NumberFormat;
022import java.util.Locale;
023
024/**
025 * <p><b>BigDecimal Validation</b> and Conversion routines (<code>java.math.BigDecimal</code>).</p>
026 *
027 * <p>This validator provides a number of methods for
028 *    validating/converting a <code>String</code> value to
029 *    a <code>BigDecimal</code> using <code>java.text.NumberFormat</code>
030 *    to parse either:</p>
031 *    <ul>
032 *       <li>using the default format for the default <code>Locale</code></li>
033 *       <li>using a specified pattern with the default <code>Locale</code></li>
034 *       <li>using the default format for a specified <code>Locale</code></li>
035 *       <li>using a specified pattern with a specified <code>Locale</code></li>
036 *    </ul>
037 *
038 * <p>Use one of the <code>isValid()</code> methods to just validate or
039 *    one of the <code>validate()</code> methods to validate and receive a
040 *    <i>converted</i> <code>BigDecimal</code> value.</p>
041 *
042 * <p>Fraction/decimal values are automatically trimmed to the appropriate length.</p>
043 *
044 * <p>Once a value has been successfully converted the following
045 *    methods can be used to perform minimum, maximum and range checks:</p>
046 *    <ul>
047 *       <li><code>minValue()</code> checks whether the value is greater
048 *           than or equal to a specified minimum.</li>
049 *       <li><code>maxValue()</code> checks whether the value is less
050 *           than or equal to a specified maximum.</li>
051 *       <li><code>isInRange()</code> checks whether the value is within
052 *           a specified range of values.</li>
053 *    </ul>
054 *
055 * <p>So that the same mechanism used for parsing an <i>input</i> value
056 *    for validation can be used to format <i>output</i>, corresponding
057 *    <code>format()</code> methods are also provided. That is you can
058 *    format either:</p>
059 *    <ul>
060 *       <li>using the default format for the default <code>Locale</code></li>
061 *       <li>using a specified pattern with the default <code>Locale</code></li>
062 *       <li>using the default format for a specified <code>Locale</code></li>
063 *       <li>using a specified pattern with a specified <code>Locale</code></li>
064 *    </ul>
065 *
066 * @since 1.3.0
067 */
068public class BigDecimalValidator extends AbstractNumberValidator {
069
070    private static final long serialVersionUID = -670320911490506772L;
071
072    private static final BigDecimalValidator VALIDATOR = new BigDecimalValidator();
073
074    /**
075     * Return a singleton instance of this validator.
076     * @return A singleton instance of the BigDecimalValidator.
077     */
078    public static BigDecimalValidator getInstance() {
079        return VALIDATOR;
080    }
081
082    /**
083     * Constructs a <i>strict</i> instance.
084     */
085    public BigDecimalValidator() {
086        this(true);
087    }
088
089    /**
090     * <p>Construct an instance with the specified strict setting.</p>
091     *
092     * @param strict {@code true} if strict
093     *        <code>Format</code> parsing should be used.
094     */
095    public BigDecimalValidator(final boolean strict) {
096        this(strict, STANDARD_FORMAT, true);
097    }
098
099    /**
100     * <p>Construct an instance with the specified strict setting
101     *    and format type.</p>
102     *
103     * <p>The <code>formatType</code> specified what type of
104     *    <code>NumberFormat</code> is created - valid types
105     *    are:</p>
106     *    <ul>
107     *       <li>AbstractNumberValidator.STANDARD_FORMAT -to create
108     *           <i>standard</i> number formats (the default).</li>
109     *       <li>AbstractNumberValidator.CURRENCY_FORMAT -to create
110     *           <i>currency</i> number formats.</li>
111     *       <li>AbstractNumberValidator.PERCENT_FORMAT -to create
112     *           <i>percent</i> number formats (the default).</li>
113     *    </ul>
114     *
115     * @param strict {@code true} if strict
116     *        <code>Format</code> parsing should be used.
117     * @param formatType The <code>NumberFormat</code> type to
118     *        create for validation, default is STANDARD_FORMAT.
119     * @param allowFractions {@code true} if fractions are
120     *        allowed or {@code false} if integers only.
121     */
122    protected BigDecimalValidator(final boolean strict, final int formatType,
123            final boolean allowFractions) {
124        super(strict, formatType, allowFractions);
125    }
126
127    /**
128     * Check if the value is within a specified range.
129     *
130     * @param value The <code>Number</code> value to check.
131     * @param min The minimum value of the range.
132     * @param max The maximum value of the range.
133     * @return {@code true} if the value is within the
134     *         specified range.
135     */
136    public boolean isInRange(final BigDecimal value, final double min, final double max) {
137        return value.doubleValue() >= min && value.doubleValue() <= max;
138    }
139
140    /**
141     * Check if the value is less than or equal to a maximum.
142     *
143     * @param value The value validation is being performed on.
144     * @param max The maximum value.
145     * @return {@code true} if the value is less than
146     *         or equal to the maximum.
147     */
148    public boolean maxValue(final BigDecimal value, final double max) {
149        return value.doubleValue() <= max;
150    }
151
152    /**
153     * Check if the value is greater than or equal to a minimum.
154     *
155     * @param value The value validation is being performed on.
156     * @param min The minimum value.
157     * @return {@code true} if the value is greater than
158     *         or equal to the minimum.
159     */
160    public boolean minValue(final BigDecimal value, final double min) {
161        return value.doubleValue() >= min;
162    }
163
164    /**
165     * Convert the parsed value to a <code>BigDecimal</code>.
166     *
167     * @param value The parsed <code>Number</code> object created.
168     * @param formatter The Format used to parse the value with.
169     * @return The parsed <code>Number</code> converted to a
170     *         <code>BigDecimal</code>.
171     */
172    @Override
173    protected Object processParsedValue(final Object value, final Format formatter) {
174        BigDecimal decimal;
175        if (value instanceof Long) {
176            decimal = BigDecimal.valueOf(((Long)value).longValue());
177        } else {
178            decimal = new BigDecimal(value.toString());
179        }
180
181        final int scale = determineScale((NumberFormat)formatter);
182        if (scale >= 0) {
183            decimal = decimal.setScale(scale, BigDecimal.ROUND_DOWN);
184        }
185
186        return decimal;
187    }
188
189    /**
190     * <p>Validate/convert a <code>BigDecimal</code> using the default
191     *    <code>Locale</code>.
192     *
193     * @param value The value validation is being performed on.
194     * @return The parsed <code>BigDecimal</code> if valid or <code>null</code>
195     *  if invalid.
196     */
197    public BigDecimal validate(final String value) {
198        return (BigDecimal)parse(value, (String)null, (Locale)null);
199    }
200
201    /**
202     * <p>Validate/convert a <code>BigDecimal</code> using the
203     *    specified <code>Locale</code>.
204     *
205     * @param value The value validation is being performed on.
206     * @param locale The locale to use for the number format, system default if null.
207     * @return The parsed <code>BigDecimal</code> if valid or <code>null</code> if invalid.
208     */
209    public BigDecimal validate(final String value, final Locale locale) {
210        return (BigDecimal)parse(value, (String)null, locale);
211    }
212
213    /**
214     * <p>Validate/convert a <code>BigDecimal</code> using the
215     *    specified <i>pattern</i>.
216     *
217     * @param value The value validation is being performed on.
218     * @param pattern The pattern used to validate the value against, or the
219     *        default for the <code>Locale</code> if <code>null</code>.
220     * @return The parsed <code>BigDecimal</code> if valid or <code>null</code> if invalid.
221     */
222    public BigDecimal validate(final String value, final String pattern) {
223        return (BigDecimal)parse(value, pattern, (Locale)null);
224    }
225
226    /**
227     * <p>Validate/convert a <code>BigDecimal</code> using the
228     *    specified pattern and/ or <code>Locale</code>.
229     *
230     * @param value The value validation is being performed on.
231     * @param pattern The pattern used to validate the value against, or the
232     *        default for the <code>Locale</code> if <code>null</code>.
233     * @param locale The locale to use for the date format, system default if null.
234     * @return The parsed <code>BigDecimal</code> if valid or <code>null</code> if invalid.
235     */
236    public BigDecimal validate(final String value, final String pattern, final Locale locale) {
237        return (BigDecimal)parse(value, pattern, locale);
238    }
239}