    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>Integer Validation</strong> and Conversion routines ({@code java.lang.Integer}).</p>
    025 *
    026 * <p>This validator provides a number of methods for
    027 *    validating/converting a {@link String} value to
    028 *    a {@code Integer} 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 Integer} 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 IntegerValidator extends AbstractNumberValidator {
    066
    067    private static final long serialVersionUID = 422081746310306596L;
    068
    069    private static final IntegerValidator VALIDATOR = new IntegerValidator();
    070
    071    /**
    072     * Gets the singleton instance of this validator.
    073     * @return A singleton instance of the IntegerValidator.
    074     */
    075    public static IntegerValidator getInstance() {
    076        return VALIDATOR;
    077    }
    078
    079    /**
    080     * Constructs a <em>strict</em> instance.
    081     */
    082    public IntegerValidator() {
    083        this(true, STANDARD_FORMAT);
    084    }
    085
    086    /**
    087     * <p>Construct an instance with the specified strict setting
    088     *    and format type.</p>
    089     *
    090     * <p>The {@code formatType} specified what type of
    091     *    {@code NumberFormat} is created - valid types
    092     *    are:</p>
    093     *    <ul>
    094     *       <li>AbstractNumberValidator.STANDARD_FORMAT -to create
    095     *           <em>standard</em> number formats (the default).</li>
    096     *       <li>AbstractNumberValidator.CURRENCY_FORMAT -to create
    097     *           <em>currency</em> number formats.</li>
    098     *       <li>AbstractNumberValidator.PERCENT_FORMAT -to create
    099     *           <em>percent</em> number formats (the default).</li>
    100     *    </ul>
    101     *
    102     * @param strict {@code true} if strict
    103     *        {@code Format} parsing should be used.
    104     * @param formatType The {@code NumberFormat} type to
    105     *        create for validation, default is STANDARD_FORMAT.
    106     */
    107    public IntegerValidator(final boolean strict, final int formatType) {
    108        super(strict, formatType, false);
    109    }
    110
    111    /**
    112     * Check if the value is within a specified range.
    113     *
    114     * @param value The {@code Number} value to check.
    115     * @param min The minimum value of the range.
    116     * @param max The maximum value of the range.
    117     * @return {@code true} if the value is within the
    118     *         specified range.
    119     */
    120    public boolean isInRange(final int value, final int min, final int max) {
    121        return value >= min && value <= max;
    122    }
    123
    124    /**
    125     * Check if the value is within a specified range.
    126     *
    127     * @param value The {@code Number} value to check.
    128     * @param min The minimum value of the range.
    129     * @param max The maximum value of the range.
    130     * @return {@code true} if the value is within the
    131     *         specified range.
    132     */
    133    public boolean isInRange(final Integer value, final int min, final int max) {
    134        return isInRange(value.intValue(), min, max);
    135    }
    136
    137    /**
    138     * Check if the value is less than or equal to a maximum.
    139     *
    140     * @param value The value validation is being performed on.
    141     * @param max The maximum value.
    142     * @return {@code true} if the value is less than
    143     *         or equal to the maximum.
    144     */
    145    public boolean maxValue(final int value, final int max) {
    146        return value <= max;
    147    }
    148
    149    /**
    150     * Check if the value is less than or equal to a maximum.
    151     *
    152     * @param value The value validation is being performed on.
    153     * @param max The maximum value.
    154     * @return {@code true} if the value is less than
    155     *         or equal to the maximum.
    156     */
    157    public boolean maxValue(final Integer value, final int max) {
    158        return maxValue(value.intValue(), max);
    159    }
    160
    161    /**
    162     * Check if the value is greater than or equal to a minimum.
    163     *
    164     * @param value The value validation is being performed on.
    165     * @param min The minimum value.
    166     * @return {@code true} if the value is greater than
    167     *         or equal to the minimum.
    168     */
    169    public boolean minValue(final int value, final int min) {
    170        return value >= min;
    171    }
    172
    173    /**
    174     * Check if the value is greater than or equal to a minimum.
    175     *
    176     * @param value The value validation is being performed on.
    177     * @param min The minimum value.
    178     * @return {@code true} if the value is greater than
    179     *         or equal to the minimum.
    180     */
    181    public boolean minValue(final Integer value, final int min) {
    182        return minValue(value.intValue(), min);
    183    }
    184
    185    /**
    186     * <p>Perform further validation and convert the {@code Number} to
    187     * an {@code Integer}.</p>
    188     *
    189     * @param value The parsed {@code Number} object created.
    190     * @param formatter The Format used to parse the value with.
    191     * @return The parsed {@code Number} converted to an
    192     *   {@code Integer} if valid or {@code null} if invalid.
    193     */
    194    @Override
    195    protected Object processParsedValue(final Object value, final Format formatter) {
    196
    197        // Parsed value will be Long if it fits in a long and is not fractional
    198        if (value instanceof Long) {
    199            final long longValue = ((Long) value).longValue();
    200            if (longValue >= Integer.MIN_VALUE &&
    201                longValue <= Integer.MAX_VALUE) {
    202                return Integer.valueOf((int) longValue);
    203            }
    204        }
    205        return null;
    206    }
    207
    208    /**
    209     * <p>Validate/convert an {@code Integer} using the default
    210     *    {@link Locale}.
    211     *
    212     * @param value The value validation is being performed on.
    213     * @return The parsed {@code Integer} if valid or {@code null}
    214     *  if invalid.
    215     */
    216    public Integer validate(final String value) {
    217        return (Integer) parse(value, (String) null, (Locale) null);
    218    }
    219
    220    /**
    221     * <p>Validate/convert an {@code Integer} using the
    222     *    specified {@link Locale}.
    223     *
    224     * @param value The value validation is being performed on.
    225     * @param locale The locale to use for the number format, system default if null.
    226     * @return The parsed {@code Integer} if valid or {@code null} if invalid.
    227     */
    228    public Integer validate(final String value, final Locale locale) {
    229        return (Integer) parse(value, (String) null, locale);
    230    }
    231
    232    /**
    233     * <p>Validate/convert an {@code Integer} using the
    234     *    specified <em>pattern</em>.
    235     *
    236     * @param value The value validation is being performed on.
    237     * @param pattern The pattern used to validate the value against.
    238     * @return The parsed {@code Integer} if valid or {@code null} if invalid.
    239     */
    240    public Integer validate(final String value, final String pattern) {
    241        return (Integer) parse(value, pattern, (Locale) null);
    242    }
    243
    244    /**
    245     * <p>Validate/convert a {@code Integer} using the
    246     *    specified pattern and/ or {@link Locale}.
    247     *
    248     * @param value The value validation is being performed on.
    249     * @param pattern The pattern used to validate the value against, or the
    250     *        default for the {@link Locale} if {@code null}.
    251     * @param locale The locale to use for the date format, system default if null.
    252     * @return The parsed {@code Integer} if valid or {@code null} if invalid.
    253     */
    254    public Integer validate(final String value, final String pattern, final Locale locale) {
    255        return (Integer) parse(value, pattern, locale);
    256    }
    257}