/**
    * Copyright (C) 2010-2012 Joerg Bellmann <joerg.bellmann@googlemail.com>
    *
    * Licensed 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 com.googlecode.t7mp.scanner;
  
  import java.util.Timer;
  
  import com.googlecode.t7mp.PluginLog;
  import com.googlecode.t7mp.Stoppable;
  
  /**
   * Scanner that creates a Timer with a TimerTask.
   * 
   * @author Joerg Bellmann
   *
   */
  public final class Scanner implements Stoppable {
  
      private static final int DEFAULT_DELAY = 10000;
      private static final int MILLIS = 1000;
  
      private final ScannerConfiguration scannerConfiguration;
      private Timer timer;
      private final PluginLog log;
  
      public Scanner(ScannerConfiguration scannerConfiguration, PluginLog log) {
          this.scannerConfiguration = scannerConfiguration;
          this.log = log;
      }
  
      public void start() {
          log.info("Starting Scanner ....");
          this.timer = new Timer();
          this.timer.scheduleAtFixedRate(new ModifiedFileTimerTask(scannerConfiguration.getRootDirectory(),
                  scannerConfiguration.getWebappDirectory(), scannerConfiguration.getEndingsAsList(), log),
                  DEFAULT_DELAY, scannerConfiguration.getInterval() * MILLIS);
          log.info("Scanner started");
      }
  
      public void stop() {
          log.info("Stopping Scanner ...");
          if (this.timer == null) {
              return;
          }
          this.timer.cancel();
          log.info("Scanner stopped");
      }
  
  }