/*
 *
 * 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.qpid.server.management.plugin.servlet.rest;

import java.util.Comparator;
import java.util.Map;

class KeyComparator implements Comparator<Map>
{
    private String _key;

    public KeyComparator(final String key)
    {
        _key = key;
    }

    public int compare(final Map o1, final Map o2)
    {
        Comparable left = (Comparable) o1.get(_key);
        Comparable right = (Comparable) o2.get(_key);

        int result;
        if(left == null)
        {
            result =  right == null ? 0 : -1;
        }
        else
        {
            result = left.compareTo(right);
        }

        return result;

    }
}
