/*
 * 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.cassandra.utils;

import java.util.Comparator;
import java.util.SortedMap;
import java.util.TreeMap;

import com.google.common.collect.SortedSetMultimap;
import com.google.common.collect.TreeMultimap;

public class SortedBiMultiValMap<K, V> extends BiMultiValMap<K, V>
{
    protected SortedBiMultiValMap(SortedMap<K, V> forwardMap, SortedSetMultimap<V, K> reverseMap)
    {
        super(forwardMap, reverseMap);
    }

    public static <K extends Comparable<K>, V extends Comparable<V>> SortedBiMultiValMap<K, V> create()
    {
        return new SortedBiMultiValMap<K, V>(new TreeMap<K,V>(), TreeMultimap.<V, K>create());
    }

    public static <K, V> SortedBiMultiValMap<K, V> create(Comparator<K> keyComparator, Comparator<V> valueComparator)
    {
        if (keyComparator == null)
            keyComparator = defaultComparator();
        if (valueComparator == null)
            valueComparator = defaultComparator();
        return new SortedBiMultiValMap<K, V>(new TreeMap<K,V>(keyComparator), TreeMultimap.<V, K>create(valueComparator, keyComparator));
    }

    public static <K extends Comparable<K>, V extends Comparable<V>> SortedBiMultiValMap<K, V> create(BiMultiValMap<K, V> map)
    {
        SortedBiMultiValMap<K, V> newMap = SortedBiMultiValMap.<K,V>create();
        newMap.forwardMap.putAll(map);
        newMap.reverseMap.putAll(map.inverse());
        return newMap;
    }

    public static <K, V> SortedBiMultiValMap<K, V> create(BiMultiValMap<K, V> map, Comparator<K> keyComparator, Comparator<V> valueComparator)
    {
        SortedBiMultiValMap<K, V> newMap = create(keyComparator, valueComparator);
        newMap.forwardMap.putAll(map);
        newMap.reverseMap.putAll(map.inverse());
        return newMap;
    }

    private static <T> Comparator<T> defaultComparator()
    {
        return new Comparator<T>()
        {
            @SuppressWarnings("unchecked")
            public int compare(T o1, T o2)
            {
                return ((Comparable<T>) o1).compareTo(o2);
            }
        };
    }
}