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/*
*
* 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.Collections;
import java.util.Comparator;
import java.util.Map;
class MapComparator implements Comparator<Map>
{
private Comparator<Map>[] _sortKeys;
public MapComparator(final String[] sortKeys)
{
_sortKeys = parseKeys(sortKeys);
}
private static Comparator<Map>[] parseKeys(final String[] sortKeys)
{
Comparator<Map>[] comparators = new Comparator[sortKeys.length];
for(int i = 0; i < sortKeys.length; i++)
{
String key = sortKeys[i];
if(key.startsWith("+") || key.startsWith(" "))
{
comparators[i] = new KeyComparator(key.substring(1));
}
else if(key.startsWith("-"))
{
comparators[i] = Collections.reverseOrder(new KeyComparator(key.substring(1)));
}
else
{
comparators[i] = new KeyComparator(key);
}
}
return comparators;
}
public int compare(final Map o1, final Map o2)
{
int result = 0;
for(int i = 0; i < _sortKeys.length; i++)
{
result = _sortKeys[i].compare(o1, o2);
if(result != 0)
{
return result;
}
}
return 0;
}
}
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