/**
    * Logback: the reliable, generic, fast and flexible logging framework.
    * Copyright (C) 1999-2015, 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.joran.spi;
  
  import ch.qos.logback.core.spi.ContextAwareBase;
  
  import java.io.File;
  import java.net.URL;
  import java.net.URLDecoder;
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * @author Ceki Gülcü
   */
  public class ConfigurationWatchList extends ContextAwareBase {
  
      URL mainURL;
      List<File> fileWatchList = new ArrayList<File>();
      List<Long> lastModifiedList = new ArrayList<Long>();
  
      public ConfigurationWatchList buildClone() {
          ConfigurationWatchList out = new ConfigurationWatchList();
          out.mainURL = this.mainURL;
          out.fileWatchList = new ArrayList<File>(this.fileWatchList);
          out.lastModifiedList = new ArrayList<Long>(this.lastModifiedList);
          return out;
      }
  
      public void clear() {
          this.mainURL = null;
          lastModifiedList.clear();
          fileWatchList.clear();
      }
  
      /**
       * The mainURL for the configuration file. Null values are allowed.
       * 
       * @param mainURL
       */
      public void setMainURL(URL mainURL) {
          // main url can be null
          this.mainURL = mainURL;
          if (mainURL != null)
              addAsFileToWatch(mainURL);
      }
  
      private void addAsFileToWatch(URL url) {
          File file = convertToFile(url);
          if (file != null) {
              fileWatchList.add(file);
              lastModifiedList.add(file.lastModified());
          }
      }
  
      public void addToWatchList(URL url) {
          addAsFileToWatch(url);
      }
  
      public URL getMainURL() {
          return mainURL;
      }
  
      public List<File> getCopyOfFileWatchList() {
          return new ArrayList<File>(fileWatchList);
      }
  
      public boolean changeDetected() {
          int len = fileWatchList.size();
          for (int i = 0; i < len; i++) {
              long lastModified = lastModifiedList.get(i);
              File file = fileWatchList.get(i);
              if (lastModified != file.lastModified()) {
                  return true;
              }
          }
          return false;
          // return (lastModified != fileToScan.lastModified() && lastModified !=
          // SENTINEL);
      }
  
      @SuppressWarnings("deprecation")
      File convertToFile(URL url) {
          String protocol = url.getProtocol();
          if ("file".equals(protocol)) {
              return new File(URLDecoder.decode(url.getFile()));
          } else {
              addInfo("URL [" + url + "] is not of type file");
             return null;
         }
     }
 
 }