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jetbrick utility classes

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/**
 * Copyright 2013-2016 Guoqiang Chen, Shanghai, China. All rights reserved.
 *
 *   Author: Guoqiang Chen
 *    Email: [email protected]
 *   WebURL: https://github.com/subchen
 *
 * Licensed 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 jetbrick.collection.bidimap;

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

abstract class AbstractBidiSortedMap extends AbstractBidiMap implements SortedMap {
    transient final SortedMap normalMap;
    transient final Comparator keyComparator;
    transient final Comparator valueComparator;

    protected AbstractBidiSortedMap(SortedMap normalMap, SortedMap reverseMap, BidiMap inverseBidiMap) {
        super(normalMap, reverseMap, inverseBidiMap);
        this.normalMap = normalMap;
        this.keyComparator = normalMap.comparator();
        this.valueComparator = reverseMap.comparator();
    }

    @Override
    public Comparator comparator() {
        return keyComparator;
    }

    public Comparator valueComparator() {
        return valueComparator;
    }

    @Override
    public SortedMap subMap(K fromKey, K toKey) {
        return normalMap.subMap(fromKey, toKey);
    }

    @Override
    public SortedMap headMap(K toKey) {
        return normalMap.headMap(toKey);

    }

    @Override
    public SortedMap tailMap(K fromKey) {
        return normalMap.tailMap(fromKey);

    }

    @Override
    public K firstKey() {
        return normalMap.firstKey();

    }

    @Override
    public K lastKey() {
        return normalMap.lastKey();
    }
}