CmiDataComparator.java

/**
 * <a href="http://www.openolat.org">
 * OpenOLAT - Online Learning and Training</a><br>
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License"); <br>
 * you may not use this file except in compliance with the License.<br>
 * You may obtain a copy of the License at the
 * <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache homepage</a>
 * <p>
 * Unless required by applicable law or agreed to in writing,<br>
 * software distributed under the License is distributed on an "AS IS" BASIS, <br>
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. <br>
 * See the License for the specific language governing permissions and <br>
 * limitations under the License.
 * <p>
 * Initial code contributed and copyrighted by<br>
 * frentix GmbH, http://www.frentix.com
 * <p>
 */
package org.olat.modules.scorm.assessment;

import java.util.Comparator;

/**
 * The comparator orders the CmiDatas with the following rule:
 * ItemId of the sco first, then the key of the data. 
 * 
 * <P>
 * Initial Date:  13 august 2009 <br>
 * @author srosse
 */
public class CmiDataComparator implements Comparator<CmiData> {

	public int compare(CmiData c1, CmiData c2) {
		if(c1 == null && c2 != null) return -1;
		else if(c1 != null && c2 == null) return 1;
		
		String i1 = c1.getItemId();
		String i2 = c2.getItemId();
		if(i1 == null && i2 != null) return -1;
		else if(i1 != null && i2 == null) return 1;
		
		int c = i1.compareTo(i2);
		if(c == 0)
		{
			String k1 = c1.getKey();
			String k2 = c2.getKey();
			if(k1 == null && k2 != null) return -1;
			else if(k1 != null && k2 == null) return 1;
			
			c = k1.compareTo(k2);
		}
		
		return c;
	}
}