/*
 * 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 hivemall.utils.lang;

import java.util.Comparator;

import javax.annotation.Nonnull;

public final class NaturalComparator<T extends Comparable<? super T>> implements Comparator<T> {

    @SuppressWarnings("rawtypes")
    private final static NaturalComparator INSTANCE = new NaturalComparator();

    private NaturalComparator() {}// avoid instantiation

    @Override
    public int compare(T o1, T o2) {
        return o1.compareTo(o2);
    }

    @SuppressWarnings("unchecked")
    @Nonnull
    public final static <T extends Comparable<? super T>> Comparator<T> getInstance() {
        return (Comparator<T>) INSTANCE;
    }

    @Nonnull
    public final static <T extends Comparable<? super T>> Comparator<T> newInstance() {
        return new NaturalComparator<T>();
    }

}
