/*
    * 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
    *
    *      https://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.text.DateFormat;
  import java.text.SimpleDateFormat;
  import java.util.Locale;
  import java.util.regex.Pattern;
  
  import org.apache.commons.validator.routines.DateValidator;
  import org.apache.commons.validator.routines.EmailValidator;
  
  /**
   * This class contains basic methods for performing validations.
   */
  public class GenericValidator implements Serializable {
  
      private static final long serialVersionUID = -7212095066891517618L;
  
      /**
       * Calculate an adjustment amount for line endings.
       *
       * See Bug 37962 for the rationale behind this.
       *
       * @param value The value validation is being performed on.
       * @param lineEndLength The length to use for line endings.
       * @return the adjustment amount.
       */
      private static int adjustForLineEnding(final String value, final int lineEndLength) {
          int nCount = 0;
          int rCount = 0;
          for (int i = 0; i < value.length(); i++) {
              if (value.charAt(i) == '\n') {
                  nCount++;
              }
              if (value.charAt(i) == '\r') {
                  rCount++;
              }
          }
          final int rnCount = rCount + nCount;
          return nCount * lineEndLength - rnCount;
      }
  
      /**
       * <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(final String value) {
          // Don't trim is already empty.
          return value == null || value.isEmpty() || value.trim().isEmpty();
      }
  
      /**
       * <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(final String value) {
          return GenericTypeValidator.formatByte(value) != null;
      }
  
      /**
       * Checks if the field is a valid credit card number.
       *
       * @param value The value validation is being performed on.
       * @return true if the value is valid Credit Card Number.
       */
      public static boolean isCreditCard(final String value) {
          return Constants.CREDIT_CARD_VALIDATOR.isValid(value);
      }
  
      /**
       * <p>Checks if the field is a valid date.  The {@link Locale} is
       * used with {@link DateFormat}.  The setLenient method
       * is set to {@code false} 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(final String value, final Locale locale) {
         return DateValidator.getInstance().isValid(value, locale);
     }
 
     /**
      * <p>Checks if the field is a valid date.  The pattern is used with
      * {@link SimpleDateFormat}.  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} for all.</p>
      *
      * @param value The value validation is being performed on.
      * @param datePattern The pattern passed to {@link SimpleDateFormat}.
      * @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(final String value, final String datePattern, final boolean strict) {
         // TODO method isValid() not yet supported in routines version
         return org.apache.commons.validator.DateValidator.getInstance().isValid(value, datePattern, strict);
     }
 
     /**
      * <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(final String value) {
         return GenericTypeValidator.formatDouble(value) != null;
     }
 
     /**
      * <p>Checks if a field has a valid e-mail address.</p>
      *
      * @param value The value validation is being performed on.
      * @return true if the value is valid Email Address.
      */
     public static boolean isEmail(final String value) {
         return EmailValidator.getInstance().isValid(value);
     }
 
     /**
      * <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(final String value) {
         return GenericTypeValidator.formatFloat(value) != null;
     }
 
     /**
     * <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(final byte value, final byte min, final 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(final double value, final double min, final double 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(final float value, final float min, final 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(final int value, final int min, final 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(final long value, final long min, final long 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(final short value, final short min, final short max) {
         return value >= min && value <= max;
     }
 
     /**
      * <p>Checks if the value can safely be converted to an 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(final 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(final String value) {
         return GenericTypeValidator.formatLong(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(final String value) {
         return GenericTypeValidator.formatShort(value) != null;
     }
 
     /**
      * <p>Checks if a field is a valid URL address.</p>
      * If you need to modify what is considered valid then
      * consider using the UrlValidator directly.
      *
      * @param value The value validation is being performed on.
      * @return true if the value is valid Url.
      */
     public static boolean isUrl(final String value) {
         return Constants.URL_VALIDATOR.isValid(value);
     }
 
     /**
      * <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(final String value, final String regexp) {
         if (regexp == null || regexp.isEmpty()) {
             return false;
         }
 
         return Pattern.matches(regexp, value);
     }
 
     /**
      * <p>Checks if the value's length is less than or equal to the max.</p>
      *
      * @param value The value validation is being performed on.
      * @param max The maximum length.
      * @return true if the value's length is less than the specified maximum.
      */
     public static boolean maxLength(final String value, final int max) {
         return value.length() <= max;
     }
 
     /**
      * <p>Checks if the value's adjusted length is less than or equal to the max.</p>
      *
      * @param value The value validation is being performed on.
      * @param max The maximum length.
      * @param lineEndLength The length to use for line endings.
      * @return true if the value's length is less than the specified maximum.
      */
     public static boolean maxLength(final String value, final int max, final int lineEndLength) {
         final int adjustAmount = adjustForLineEnding(value, lineEndLength);
         return value.length() + adjustAmount <= max;
     }
 
     /**
      * <p>Checks if the value is less than or equal to the max.</p>
      *
      * @param value The value validation is being performed on.
      * @param max The maximum numeric value.
      * @return true if the value is &lt;= the specified maximum.
      */
     public static boolean maxValue(final double value, final double max) {
         return value <= max;
     }
 
     /**
      * <p>Checks if the value is less than or equal to the max.</p>
      *
      * @param value The value validation is being performed on.
      * @param max The maximum numeric value.
      * @return true if the value is &lt;= the specified maximum.
      */
     public static boolean maxValue(final float value, final float max) {
         return value <= max;
     }
 
     /**
      * <p>Checks if the value is less than or equal to the max.</p>
      *
      * @param value The value validation is being performed on.
      * @param max The maximum numeric value.
      * @return true if the value is &lt;= the specified maximum.
      */
     public static boolean maxValue(final int value, final int max) {
         return value <= max;
     }
 
     // See https://issues.apache.org/bugzilla/show_bug.cgi?id=29015 regarding the "value" methods.
 
     /**
      * <p>Checks if the value is less than or equal to the max.</p>
      *
      * @param value The value validation is being performed on.
      * @param max The maximum numeric value.
      * @return true if the value is &lt;= the specified maximum.
      */
     public static boolean maxValue(final long value, final long max) {
         return value <= max;
     }
 
     /**
      * <p>Checks if the value's length is greater than or equal to the min.</p>
      *
      * @param value The value validation is being performed on.
      * @param min The minimum length.
      * @return true if the value's length is more than the specified minimum.
      */
     public static boolean minLength(final String value, final int min) {
         return value.length() >= min;
     }
 
     /**
      * <p>Checks if the value's adjusted length is greater than or equal to the min.</p>
      *
      * @param value The value validation is being performed on.
      * @param min The minimum length.
      * @param lineEndLength The length to use for line endings.
      * @return true if the value's length is more than the specified minimum.
      */
     public static boolean minLength(final String value, final int min, final int lineEndLength) {
         final int adjustAmount = adjustForLineEnding(value, lineEndLength);
         return value.length() + adjustAmount >= min;
     }
 
     /**
      * <p>Checks if the value is greater than or equal to the min.</p>
      *
      * @param value The value validation is being performed on.
      * @param min The minimum numeric value.
      * @return true if the value is &gt;= the specified minimum.
      */
     public static boolean minValue(final double value, final double min) {
         return value >= min;
     }
 
     /**
      * <p>Checks if the value is greater than or equal to the min.</p>
      *
      * @param value The value validation is being performed on.
      * @param min The minimum numeric value.
      * @return true if the value is &gt;= the specified minimum.
      */
     public static boolean minValue(final float value, final float min) {
         return value >= min;
     }
 
     /**
      * <p>Checks if the value is greater than or equal to the min.</p>
      *
      * @param value The value validation is being performed on.
      * @param min The minimum numeric value.
      * @return true if the value is &gt;= the specified minimum.
      */
     public static boolean minValue(final int value, final int min) {
         return value >= min;
     }
 
     /**
      * <p>Checks if the value is greater than or equal to the min.</p>
      *
      * @param value The value validation is being performed on.
      * @param min The minimum numeric value.
      * @return true if the value is &gt;= the specified minimum.
      */
     public static boolean minValue(final long value, final long min) {
         return value >= min;
     }
 
     /**
      * Constructs a new instance.
      *
      * @deprecated Will be private in the next major version.
      */
     @Deprecated
     public GenericValidator() {
         // empty
     }
 
 }