FileComparator.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2011 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package  org.turro.file;
 
import java.io.File;
import java.util.Comparator;
import java.util.Properties;
 
public class FileComparator implements Comparator {
 
  private Properties props;
 
  public FileComparator(Properties props) {
    this.props = props;
  }
 
  @Override
  public int compare(Object o1, Object o2) {
    File f1 = (File) o1,
         f2 = (File) o2;
 
    String field;
    boolean desc;
    int result = 0;
    for(int i = 0; i < 10 && result == 0; i++) {
      field = props.getProperty("file.ordering." + i + ".name");
      desc = "desc".equals(props.getProperty("file.ordering." + i + ".order"));
      if(result == 0 && "directory".equals(field)) {
        if(!f1.isDirectory() && f2.isDirectory()) {
          result = 1;
        }
        else if(f1.isDirectory() && !f2.isDirectory()) {
          result = -1;
        }
        else {
          result = 0;
        }
        if(desc) result *= -1;
      }
      else if(result == 0 && "fileName".equals(field)) {
        result = f1.getName().compareTo(f2.getName());
        if(desc) result *= -1;
      }
      else if(result == 0 && "fileDate".equals(field)) {
        result = Long.valueOf(f1.lastModified()).compareTo(f2.lastModified());
        if(desc) result *= -1;
      }
      else if(!f1.isDirectory() && !f2.isDirectory() && result == 0 && "fileSize".equals(field)) {
        result = Long.valueOf(f1.length()).compareTo(f2.length());
        if(desc) result *= -1;
      }
    }
    return result;
  }
 
}