0.10/crawler/src/main/java/org/apache/oodt/cas/crawl/action/DeleteFile.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.oodt.cas.crawl.action;

//JDK imports
import java.io.File;
import java.util.logging.Level;

//Apache imports
import org.apache.commons.io.FileUtils;
import org.apache.commons.lang.Validate;

//OODT imports
import org.apache.oodt.cas.crawl.structs.exceptions.CrawlerActionException;
import org.apache.oodt.cas.metadata.Metadata;

/**
 * Deletes a product file as a {@link CrawlerAction} response.
 * 
 * @author bfoster (Brian Foster)
 * @author mattmann (Chris Mattmann)
 * @author luca (Luca Cinquini)
 */
public class DeleteFile extends CrawlerAction {

   private File file;
   private String fileExtension;

   @Override
   public boolean performAction(File product, Metadata productMetadata)
         throws CrawlerActionException {
      try {
         File fileToDelete = product;
         if (file != null) {
            fileToDelete = file;
         } else if (fileExtension != null) {
            fileToDelete = new File(product.getAbsolutePath() + "." + fileExtension);
         }

         LOG.log(Level.INFO, "Deleting file " + fileToDelete.getAbsolutePath());
         if (fileToDelete.isDirectory()) {
         	// the following method will throw an exception if the directory cannot be deleted
         	FileUtils.deleteDirectory(fileToDelete); 
         	return true;
         } else {
        	 return fileToDelete.delete();
         }
         
      } catch (Exception e) {
         LOG.log(Level.SEVERE, "Error while deleting file for product '"
               + product + "' : " + e.getMessage(), e);
         return false;
      }
   }

   @Override
   public void validate() throws CrawlerActionException {
      super.validate();
      try {
         Validate.isTrue(file == null || fileExtension == null,
               "Must specify either file or fileExtension");
      } catch (Exception e) {
         throw new CrawlerActionException(e);
      }
   }

   public void setFile(File file) {
      this.file = file;
   }

   public void setFileExtension(String fileExtension) {
      this.fileExtension = fileExtension;
   }
}