/*
    * Logback: the reliable, generic, fast and flexible logging framework.
    * Copyright (C) 1999-2024, QOS.ch. All rights reserved.
    *
    * This program and the accompanying materials are dual-licensed under
    * either the terms of the Eclipse Public License v1.0 as published by
    * the Eclipse Foundation
    *
    *   or (per the licensee's choosing)
   *
   * under the terms of the GNU Lesser General Public License version 2.1
   * as published by the Free Software Foundation.
   */
  
  package ch.qos.logback.core.util;
  
  import ch.qos.logback.core.CoreConstants;
  
  /**
   * @since 1.5.0
   */
  public class StringUtil {
  
      public static String nullStringToEmpty(String input) {
          if (input != null)
              return input;
          else
              return CoreConstants.EMPTY_STRING;
      }
  
      /**
       * Returns true if input str is null or empty.
       *
       * @param str
       * @return
       */
      public static boolean isNullOrEmpty(String str) {
          return ((str == null) || str.isEmpty());
      }
  
      /**
       * Returns true if input str is not null nor empty.
       *
       * @param str
       * @return
       */
      public static boolean notNullNorEmpty(String str) {
          return !isNullOrEmpty(str);
      }
  
      public static String capitalizeFirstLetter(String name) {
          if (isNullOrEmpty(name))
              return name;
  
          if (name.length() == 1) {
              return name.toUpperCase();
          } else
              return name.substring(0, 1).toUpperCase() + name.substring(1);
      }
  
      public static String lowercaseFirstLetter(String name) {
          if (isNullOrEmpty(name))
              return name;
  
          if (name.length() == 1) {
              return name.toLowerCase();
          } else
              return name.substring(0, 1).toLowerCase() + name.substring(1);
      }
  
  }