Source code
Description: source: package: org.apache.commons.validator.routines, class: FloatValidator

    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 * <strong>Float Validation</strong> and Conversion routines ({@link Float}).
    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     * Construct an instance with the specified strict setting
    089     *    and format type.
    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     * Tests 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     * Tests 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     * Tests 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     * Tests 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     * Tests 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     * Tests 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     * Perform further validation and convert the {@code Number} to
    188     * a {@code Float}.
    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        final double doubleValue = value instanceof Double ? (Double) value : Double.valueOf(((Number) value).doubleValue());
    198        if (doubleValue > 0) {
    199            if (doubleValue == Double.POSITIVE_INFINITY) {
    200                return Float.POSITIVE_INFINITY;
    201            }
    202            if (doubleValue < Float.MIN_VALUE || doubleValue > Float.MAX_VALUE) {
    203                return null;
    204            }
    205        } else if (doubleValue < 0) {
    206            if (doubleValue == Double.NEGATIVE_INFINITY) {
    207                return Float.NEGATIVE_INFINITY;
    208            }
    209            final double posDouble = doubleValue * -1;
    210            if (posDouble < Float.MIN_VALUE || posDouble > Float.MAX_VALUE) {
    211                return null;
    212            }
    213        }
    214        return Float.valueOf((float) doubleValue);
    215    }
    216
    217    /**
    218     * Validate/convert a {@code Float} using the default
    219     *    {@link Locale}.
    220     *
    221     * @param value The value validation is being performed on.
    222     * @return The parsed {@code Float} if valid or {@code null}
    223     *  if invalid.
    224     */
    225    public Float validate(final String value) {
    226        return (Float) parse(value, (String) null, (Locale) null);
    227    }
    228
    229    /**
    230     * Validate/convert a {@code Float} using the
    231     *    specified {@link Locale}.
    232     *
    233     * @param value The value validation is being performed on.
    234     * @param locale The locale to use for the number format, system default if null.
    235     * @return The parsed {@code Float} if valid or {@code null} if invalid.
    236     */
    237    public Float validate(final String value, final Locale locale) {
    238        return (Float) parse(value, (String) null, locale);
    239    }
    240
    241    /**
    242     * Validate/convert a {@code Float} using the
    243     *    specified <em>pattern</em>.
    244     *
    245     * @param value The value validation is being performed on.
    246     * @param pattern The pattern used to validate the value against.
    247     * @return The parsed {@code Float} if valid or {@code null} if invalid.
    248     */
    249    public Float validate(final String value, final String pattern) {
    250        return (Float) parse(value, pattern, (Locale) null);
    251    }
    252
    253    /**
    254     * Validate/convert a {@code Float} using the
    255     *    specified pattern and/ or {@link Locale}.
    256     *
    257     * @param value The value validation is being performed on.
    258     * @param pattern The pattern used to validate the value against, or the
    259     *        default for the {@link Locale} if {@code null}.
    260     * @param locale The locale to use for the date format, system default if null.
    261     * @return The parsed {@code Float} if valid or {@code null} if invalid.
    262     */
    263    public Float validate(final String value, final String pattern, final Locale locale) {
    264        return (Float) parse(value, pattern, locale);
    265    }
    266
    267}