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 *      https://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.text.Format;
020import java.text.NumberFormat;
021import java.util.Locale;
022
023/**
024 * <p><strong>Float Validation</strong> and Conversion routines ({@link Float}).</p>
025 *
026 * <p>This validator provides a number of methods for
027 *    validating/converting a {@link String} value to
028 *    a {@code Float} using {@link NumberFormat}
029 *    to parse either:</p>
030 *    <ul>
031 *       <li>using the default format for the default {@link Locale}</li>
032 *       <li>using a specified pattern with the default {@link Locale}</li>
033 *       <li>using the default format for a specified {@link Locale}</li>
034 *       <li>using a specified pattern with a specified {@link Locale}</li>
035 *    </ul>
036 *
037 * <p>Use one of the {@code isValid()} methods to just validate or
038 *    one of the {@code validate()} methods to validate and receive a
039 *    <em>converted</em> {@code Float} value.</p>
040 *
041 * <p>Once a value has been successfully converted the following
042 *    methods can be used to perform minimum, maximum and range checks:</p>
043 *    <ul>
044 *       <li>{@code minValue()} checks whether the value is greater
045 *           than or equal to a specified minimum.</li>
046 *       <li>{@code maxValue()} checks whether the value is less
047 *           than or equal to a specified maximum.</li>
048 *       <li>{@code isInRange()} checks whether the value is within
049 *           a specified range of values.</li>
050 *    </ul>
051 *
052 * <p>So that the same mechanism used for parsing an <em>input</em> value
053 *    for validation can be used to format <em>output</em>, corresponding
054 *    {@code format()} methods are also provided. That is you can
055 *    format either:</p>
056 *    <ul>
057 *       <li>using the default format for the default {@link Locale}</li>
058 *       <li>using a specified pattern with the default {@link Locale}</li>
059 *       <li>using the default format for a specified {@link Locale}</li>
060 *       <li>using a specified pattern with a specified {@link Locale}</li>
061 *    </ul>
062 *
063 * @since 1.3.0
064 */
065public class FloatValidator extends AbstractNumberValidator {
066
067    private static final long serialVersionUID = -4513245432806414267L;
068
069    private static final FloatValidator VALIDATOR = new FloatValidator();
070
071    /**
072     * Gets the singleton instance of this validator.
073     *
074     * @return A singleton instance of the FloatValidator.
075     */
076    public static FloatValidator getInstance() {
077        return VALIDATOR;
078    }
079
080    /**
081     * Constructs a <em>strict</em> instance.
082     */
083    public FloatValidator() {
084        this(true, STANDARD_FORMAT);
085    }
086
087    /**
088     * <p>Construct an instance with the specified strict setting
089     *    and format type.</p>
090     *
091     * <p>The {@code formatType} specified what type of
092     *    {@code NumberFormat} is created - valid types
093     *    are:</p>
094     *    <ul>
095     *       <li>AbstractNumberValidator.STANDARD_FORMAT -to create
096     *           <em>standard</em> number formats (the default).</li>
097     *       <li>AbstractNumberValidator.CURRENCY_FORMAT -to create
098     *           <em>currency</em> number formats.</li>
099     *       <li>AbstractNumberValidator.PERCENT_FORMAT -to create
100     *           <em>percent</em> number formats (the default).</li>
101     *    </ul>
102     *
103     * @param strict {@code true} if strict
104     *        {@code Format} parsing should be used.
105     * @param formatType The {@code NumberFormat} type to
106     *        create for validation, default is STANDARD_FORMAT.
107     */
108    public FloatValidator(final boolean strict, final int formatType) {
109        super(strict, formatType, true);
110    }
111
112    /**
113     * Check if the value is within a specified range.
114     *
115     * @param value The {@code Number} value to check.
116     * @param min The minimum value of the range.
117     * @param max The maximum value of the range.
118     * @return {@code true} if the value is within the
119     *         specified range.
120     */
121    public boolean isInRange(final float value, final float min, final float max) {
122        return value >= min && value <= max;
123    }
124
125    /**
126     * Check if the value is within a specified range.
127     *
128     * @param value The {@code Number} value to check.
129     * @param min The minimum value of the range.
130     * @param max The maximum value of the range.
131     * @return {@code true} if the value is within the
132     *         specified range.
133     */
134    public boolean isInRange(final Float value, final float min, final float max) {
135        return isInRange(value.floatValue(), min, max);
136    }
137
138    /**
139     * Check if the value is less than or equal to a maximum.
140     *
141     * @param value The value validation is being performed on.
142     * @param max The maximum value.
143     * @return {@code true} if the value is less than
144     *         or equal to the maximum.
145     */
146    public boolean maxValue(final float value, final float max) {
147        return value <= max;
148    }
149
150    /**
151     * Check if the value is less than or equal to a maximum.
152     *
153     * @param value The value validation is being performed on.
154     * @param max The maximum value.
155     * @return {@code true} if the value is less than
156     *         or equal to the maximum.
157     */
158    public boolean maxValue(final Float value, final float max) {
159        return maxValue(value.floatValue(), max);
160    }
161
162    /**
163     * Check if the value is greater than or equal to a minimum.
164     *
165     * @param value The value validation is being performed on.
166     * @param min The minimum value.
167     * @return {@code true} if the value is greater than
168     *         or equal to the minimum.
169     */
170    public boolean minValue(final float value, final float min) {
171        return value >= min;
172    }
173
174    /**
175     * Check if the value is greater than or equal to a minimum.
176     *
177     * @param value The value validation is being performed on.
178     * @param min The minimum value.
179     * @return {@code true} if the value is greater than
180     *         or equal to the minimum.
181     */
182    public boolean minValue(final Float value, final float min) {
183        return minValue(value.floatValue(), min);
184    }
185
186    /**
187     * <p>Perform further validation and convert the {@code Number} to
188     * a {@code Float}.</p>
189     *
190     * @param value The parsed {@code Number} object created.
191     * @param formatter The Format used to parse the value with.
192     * @return The parsed {@code Number} converted to a
193     *   {@code Float} if valid or {@code null} if invalid.
194     */
195    @Override
196    protected Object processParsedValue(final Object value, final Format formatter) {
197
198        final double doubleValue = ((Number) value).doubleValue();
199
200        if (doubleValue > 0) {
201            if (doubleValue < Float.MIN_VALUE || doubleValue > Float.MAX_VALUE) {
202                return null;
203            }
204        } else if (doubleValue < 0) {
205            final double posDouble = doubleValue * -1;
206            if (posDouble < Float.MIN_VALUE || posDouble > Float.MAX_VALUE) {
207                return null;
208            }
209        }
210
211        return Float.valueOf((float) doubleValue);
212
213    }
214
215    /**
216     * <p>Validate/convert a {@code Float} using the default
217     *    {@link Locale}.
218     *
219     * @param value The value validation is being performed on.
220     * @return The parsed {@code Float} if valid or {@code null}
221     *  if invalid.
222     */
223    public Float validate(final String value) {
224        return (Float) parse(value, (String) null, (Locale) null);
225    }
226
227    /**
228     * <p>Validate/convert a {@code Float} using the
229     *    specified {@link Locale}.
230     *
231     * @param value The value validation is being performed on.
232     * @param locale The locale to use for the number format, system default if null.
233     * @return The parsed {@code Float} if valid or {@code null} if invalid.
234     */
235    public Float validate(final String value, final Locale locale) {
236        return (Float) parse(value, (String) null, locale);
237    }
238
239    /**
240     * <p>Validate/convert a {@code Float} using the
241     *    specified <em>pattern</em>.
242     *
243     * @param value The value validation is being performed on.
244     * @param pattern The pattern used to validate the value against.
245     * @return The parsed {@code Float} if valid or {@code null} if invalid.
246     */
247    public Float validate(final String value, final String pattern) {
248        return (Float) parse(value, pattern, (Locale) null);
249    }
250
251    /**
252     * <p>Validate/convert a {@code Float} using the
253     *    specified pattern and/ or {@link Locale}.
254     *
255     * @param value The value validation is being performed on.
256     * @param pattern The pattern used to validate the value against, or the
257     *        default for the {@link Locale} if {@code null}.
258     * @param locale The locale to use for the date format, system default if null.
259     * @return The parsed {@code Float} if valid or {@code null} if invalid.
260     */
261    public Float validate(final String value, final String pattern, final Locale locale) {
262        return (Float) parse(value, pattern, locale);
263    }
264
265}