genericvalidator.java

java验证框架 java验证框架

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.validator;

import java.io.Serializable;
import java.util.Locale;

import org.apache.oro.text.perl.Perl5Util;

/**
 * This class contains basic methods for performing validations.
 *
 * @version $Revision: 478334 $ $Date: 2006-11-22 21:31:54 +0000 (Wed, 22 Nov 2006) $
 */
public class GenericValidator implements Serializable {

    /**
     * UrlValidator used in wrapper method.
     */
    private static final UrlValidator URL_VALIDATOR = new UrlValidator();

    /**
     * CreditCardValidator used in wrapper method.
     */
    private static final CreditCardValidator CREDIT_CARD_VALIDATOR =
        new CreditCardValidator();

    /**
     * <p>Checks if the field isn't null and length of the field is greater 
     * than zero not including whitespace.</p>
     *
     * @param value The value validation is being performed on.
     * @return true if blank or null.
     */
    public static boolean isBlankOrNull(String value) {
        return ((value == null) || (value.trim().length() == 0));
    }

    /**
     * <p>Checks if the value matches the regular expression.</p>
     *
     * @param value The value validation is being performed on.
     * @param regexp The regular expression.
     * @return true if matches the regular expression.
     */
    public static boolean matchRegexp(String value, String regexp) {
        if (regexp == null || regexp.length() <= 0) {
            return false;
        }

        Perl5Util matcher = new Perl5Util();
        return matcher.match("/" + regexp + "/", value);
    }

    /**
     * <p>Checks if the value can safely be converted to a byte primitive.</p>
     *
     * @param value The value validation is being performed on.
     * @return true if the value can be converted to a Byte.
     */
    public static boolean isByte(String value) {
        return (GenericTypeValidator.formatByte(value) != null);
    }

    /**
     * <p>Checks if the value can safely be converted to a short primitive.</p>
     *
     * @param value The value validation is being performed on.
     * @return true if the value can be converted to a Short.
     */
    public static boolean isShort(String value) {
        return (GenericTypeValidator.formatShort(value) != null);
    }

    /**
     * <p>Checks if the value can safely be converted to a int primitive.</p>
     *
     * @param value The value validation is being performed on.
     * @return true if the value can be converted to an Integer.
     */
    public static boolean isInt(String value) {
        return (GenericTypeValidator.formatInt(value) != null);
    }

    /**
     * <p>Checks if the value can safely be converted to a long primitive.</p>
     *
     * @param value The value validation is being performed on.
     * @return true if the value can be converted to a Long.
     */
    public static boolean isLong(String value) {
        return (GenericTypeValidator.formatLong(value) != null);
    }

    /**
     * <p>Checks if the value can safely be converted to a float primitive.</p>
     *
     * @param value The value validation is being performed on.
     * @return true if the value can be converted to a Float.
     */
    public static boolean isFloat(String value) {
        return (GenericTypeValidator.formatFloat(value) != null);
    }

    /**
     * <p>Checks if the value can safely be converted to a double primitive.</p>
     *
     * @param value The value validation is being performed on.
     * @return true if the value can be converted to a Double.
     */
    public static boolean isDouble(String value) {
        return (GenericTypeValidator.formatDouble(value) != null);
    }

    /**
     * <p>Checks if the field is a valid date.  The <code>Locale</code> is
     * used with <code>java.text.DateFormat</code>.  The setLenient method
     * is set to <code>false</code> for all.</p>
     *
     * @param value The value validation is being performed on.
     * @param locale The locale to use for the date format, defaults to the 
     * system default if null.
     * @return true if the value can be converted to a Date.
     */
    public static boolean isDate(String value, Locale locale) {
        return DateValidator.getInstance().isValid(value, locale);
    }

    /**
     * <p>Checks if the field is a valid date.  The pattern is used with
     * <code>java.text.SimpleDateFormat</code>.  If strict is true, then the
     * length will be checked so '2/12/1999' will not pass validation with
     * the format 'MM/dd/yyyy' because the month isn't two digits.
     * The setLenient method is set to <code>false</code> for all.</p>
     *
     * @param value The value validation is being performed on.
     * @param datePattern The pattern passed to <code>SimpleDateFormat</code>.
     * @param strict Whether or not to have an exact match of the datePattern.
     * @return true if the value can be converted to a Date.
     */
    public static boolean isDate(String value, String datePattern, boolean strict) {
        return DateValidator.getInstance().isValid(value, datePattern, strict);
    }

    /**
    * <p>Checks if a value is within a range (min &amp; max specified
    * in the vars attribute).</p>
    *
    * @param value The value validation is being performed on.
    * @param min The minimum value of the range.
    * @param max The maximum value of the range.
     * @return true if the value is in the specified range.
    */
    public static boolean isInRange(byte value, byte min, byte max) {
        return ((value >= min) && (value <= max));
    }

    /**
     * <p>Checks if a value is within a range (min &amp; max specified
     * in the vars attribute).</p>
     *
     * @param value The value validation is being performed on.
     * @param min The minimum value of the range.
     * @param max The maximum value of the range.
     * @return true if the value is in the specified range.
     */
    public static boolean isInRange(int value, int min, int max) {
        return ((value >= min) && (value <= max));
    }

    /**
     * <p>Checks if a value is within a range (min &amp; max specified
     * in the vars attribute).</p>
     *
     * @param value The value validation is being performed on.
     * @param min The minimum value of the range.
     * @param max The maximum value of the range.
     * @return true if the value is in the specified range.
     */
    public static boolean isInRange(float value, float min, float max) {
        return ((value >= min) && (value <= max));
    }

    /**
     * <p>Checks if a value is within a range (min &amp; max specified
     * in the vars attribute).</p>
     *
     * @param value The value validation is being performed on.
     * @param min The minimum value of the range.
     * @param max The maximum value of the range.
     * @return true if the value is in the specified range.
     */
    public static boolean isInRange(short value, short min, short max) {
        return ((value >= min) && (value <= max));
    }

    /**
     * <p>Checks if a value is within a range (min &amp; max specified
     * in the vars attribute).</p>
     *
     * @param value The value validation is being performed on.