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package com.groupbyinc.util;

public class StringUtils {

  /**
   * Checks if a CharSequence is empty (""), null or whitespace only.
   *
   * Whitespace is defined by {@link Character#isWhitespace(char)}.
   *
   *    * StringUtils.isBlank(null)      = true
   * StringUtils.isBlank("")        = true
   * StringUtils.isBlank(" ")       = true
   * StringUtils.isBlank("bob")     = false
   * StringUtils.isBlank("  bob  ") = false
   * 
   *
   * @param cs  the CharSequence to check, may be null
   * @return {@code true} if the CharSequence is null, empty or whitespace only
   */
  public static boolean isBlank(final CharSequence cs) {
    int strLen;
    if (cs == null || (strLen = cs.length()) == 0) {
      return true;
    }
    for (int i = 0; i < strLen; i++) {
      if (!Character.isWhitespace(cs.charAt(i))) {
        return false;
      }
    }
    return true;
  }
}