CaseInsensitiveComparator.java

/**
*    Copyright (c) 2011-2014, OpenIoT
*   
*    This file is part of OpenIoT.
*
*    OpenIoT is free software: you can redistribute it and/or modify
*    it under the terms of the GNU Lesser General Public License as published by
*    the Free Software Foundation, version 3 of the License.
*
*    OpenIoT 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 Lesser General Public License for more details.
*
*    You should have received a copy of the GNU Lesser General Public License
*    along with OpenIoT.  If not, see <http://www.gnu.org/licenses/>.
*
*     Contact: OpenIoT mailto: info@openiot.eu
 * @author Mehdi Riahi
 * @author Ali Salehi
 * @author Timotee Maret
*/

package org.openiot.gsn.utils;

import java.io.Serializable;
import java.util.Comparator;

/**
 * Note that this class will trim all the space characters surrounding the key
 * and value pairs hence you don't need to call trim when putting or getting a
 * value to/from the hashmap.
 */
public class CaseInsensitiveComparator implements Comparator,Serializable {
   
private static final long serialVersionUID = 2540687777213332025L;

public int compare ( Object o1 , Object o2 ) {
      if ( o1 == null && o2 == null ) return 0;
      if ( o1 == null ) return -1;
      if ( o2 == null ) return 1;
      String input1 = o1.toString( ).trim( );
      String input2 = o2.toString( ).trim( );
      return input1.compareToIgnoreCase( input2 );
   }
}