/*
    * Copyright 2007-2008 The Kuali Foundation
    * 
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    * 
   * 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.kuali.ole.sys.batch;
  
  import java.io.File;
  import java.util.Calendar;
  import java.util.Date;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.ole.sys.OLEConstants;
  import org.kuali.rice.core.api.config.property.ConfigurationService;
  
  /**
   * 
   * Purges old files from the temp directory specified in build.properties
   */
  public class PurgeTempFilesStep extends AbstractStep {
      
      private ConfigurationService kualiConfigurationService;
      
      /**
       * Deletes all files in the temp directory that are over 1 day old
       * 
       * @see org.kuali.ole.sys.batch.Step#execute(String, Date)
       */
      public boolean execute(String jobName, Date jobRunDate) throws InterruptedException {
          Calendar calendar = getDateTimeService().getCurrentCalendar();
          calendar.add(Calendar.DATE, -1);
          String location = kualiConfigurationService.getPropertyValueAsString(OLEConstants.TEMP_DIRECTORY_KEY) + File.separator;
          deleteTempBefore(location, calendar.getTimeInMillis());
          return true;
      }
  
      /**
       * 
       * delete files in the specified directory that are older than the modification time
       * 
       * @param location the path to temp files
       * @param modificationTime delete if file is older than this
       */
      private void deleteTempBefore(String location, long modificationTime) {
          if (StringUtils.isBlank(location)) {
              throw new RuntimeException("temp location is blank");
          }
          File tempDir = new File(location);
          if (!tempDir.exists()) {
              throw new RuntimeException("temp directory does not exist");
          }
          if (!tempDir.isDirectory()) {
              throw new RuntimeException("temp directory is not a directory! " + tempDir.getAbsolutePath());
          }
          try {
              File dir = new File(location);
              String[] files = dir.list();
              for (int i = 0; i < files.length; i++) {
                  String filename = files[i];
                  File f = new File(location + filename);
                  if(f.lastModified() < modificationTime) {
                      f.delete();
                  }
              }
          } catch (Exception e) {
              throw new RuntimeException("Caught exception while trying to remove temp files at " + location, e);
          }
      }
  
      /**
       * Sets the configurationService attribute value.
       * @param configurationService The configurationService to set.
       */
      public void setConfigurationService(ConfigurationService configurationService) {
          this.kualiConfigurationService = configurationService;
      }
      
  }