/*

  * Copyright 2010 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.osedu.org/licenses/ECL-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.kuali.student.contract.model.util;

 import java.util.ArrayList;

 import java.util.List;

 import org.kuali.student.contract.model.Service;

 /**

  *

  * @author nwright

  */

 public class ServicesFilterLatestVersionOnly implements ServicesFilter {

     @Override

     public List<Service> filter(List<Service> services) {

         List<Service> list = new ArrayList();

         for (Service target : services) {

             int i = findService(list, target.getKey());

             if (i == -1) {

                 list.add(target);

                 continue;

             }

             Service source = list.get(i);

             if (compare(source.getVersion(), target.getVersion()) < 0) {

                 list.set(i, target);

             }

         }

         return list;

     }

     protected int compare(String source, String target) {

         if (source.equalsIgnoreCase(target)) {

             return 0;

         }

         if (target.equalsIgnoreCase("dev")) {

             return +1;

         }

         return source.compareToIgnoreCase(target);

     }

     private int findService(List<Service> list, String key) {

         for (int i = 0; i < list.size(); i++) {

             Service service = list.get(i);

             if (service.getKey().equals(key)) {

                 return i;

             }

         }

         return -1;

     }

 }