/**
 * Licensed to Apereo under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright ownership. Apereo
 * 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 the
 * following location:
 *
 * <p>http://www.apache.org/licenses/LICENSE-2.0
 *
 * <p>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.apereo.portal.io.xml.eventaggr;

import java.util.Arrays;
import java.util.Comparator;
import org.apache.commons.collections.comparators.ComparatorChain;
import org.apereo.portal.utils.ComparableExtractingComparator;

/**
 * Sort group mappings
 *
 */
public class ExternalAggregatedGroupMappingComparator
        implements Comparator<ExternalAggregatedGroupMapping> {
    private final ComparatorChain chain;

    public static final ExternalAggregatedGroupMappingComparator INSTANCE =
            new ExternalAggregatedGroupMappingComparator();

    @SuppressWarnings("unchecked")
    private ExternalAggregatedGroupMappingComparator() {
        chain =
                new ComparatorChain(
                        Arrays.asList(
                                new ComparableExtractingComparator<
                                        ExternalAggregatedGroupMapping, String>() {
                                    @Override
                                    protected String getComparable(
                                            ExternalAggregatedGroupMapping o) {
                                        return o.getGroupService();
                                    }
                                },
                                new ComparableExtractingComparator<
                                        ExternalAggregatedGroupMapping, String>() {
                                    @Override
                                    protected String getComparable(
                                            ExternalAggregatedGroupMapping o) {
                                        return o.getGroupName();
                                    }
                                }));
    }

    @Override
    public int compare(ExternalAggregatedGroupMapping o1, ExternalAggregatedGroupMapping o2) {
        return chain.compare(o1, o2);
    }
}