| /* |
| * 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.filemgr.structs.query; |
| |
| //JDK imports |
| import java.util.Comparator; |
| |
| /** |
| * |
| * @author bfoster |
| * @version $Revision$ |
| * |
| * <p> |
| * A Comparator that allows for sorting of QueryResults based on a |
| * Metadata element |
| * <p> |
| */ |
| public class QueryResultComparator implements Comparator<QueryResult> { |
| |
| private String sortByMetKey; |
| |
| public String getSortByMetKey() { |
| return sortByMetKey; |
| } |
| |
| public void setSortByMetKey(String sortByMetKey) { |
| this.sortByMetKey = sortByMetKey; |
| } |
| |
| public int compare(QueryResult qr1, QueryResult qr2) { |
| String m1 = qr1.getMetadata().getMetadata(sortByMetKey); |
| String m2 = qr2.getMetadata().getMetadata(sortByMetKey); |
| if (m1 == m2) |
| return 0; |
| // return null last, since they are the least interesting |
| if (m1 == null) |
| return 1; |
| if (m2 == null) |
| return -1; |
| return m1.compareTo(m2); |
| } |
| |
| } |