/*
*
* * 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
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*
*/
package org.apache.usergrid.persistence.graph.serialization.impl.shard.impl.comparators;
import java.util.Comparator;
import org.apache.usergrid.persistence.graph.SearchByEdgeType;
/**
* Comparator that will compare in reverse or forward order based on the order type specified.
*
* Assumes descending uses the default order. If ASCENDING, the result of the comparator will be reversed
*/
public class OrderedComparator<T> implements Comparator<T> {
private final int invert;
private final Comparator<T> delegate;
public OrderedComparator( final Comparator<T> delegate, final SearchByEdgeType.Order order ) {
this.invert = order == SearchByEdgeType.Order.DESCENDING ? 1 : -1;
this.delegate = delegate;
}
@Override
public int compare( final T o1, final T o2 ) {
return delegate.compare( o1, o2 ) * invert;
}
}