cassandra-trunk/src/java/org/apache/cassandra/utils/Comparables.java
/*
 * 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;

/**
 * Utility methods linked to comparing comparable values.
 */
public class Comparables
{
    /**
     * Returns the maximum of 2 comparable values. On ties, returns the first argument.
     */
    public static <T extends Comparable<? super T>> T max(T a, T b)
    {
        return a.compareTo(b) < 0 ? b : a;
    }

    /**
     * Returns the maximum of 2 values given a comparator of those values. On ties, returns the first argument.
     */
    public static <C, T extends C> T max(T a, T b, Comparator<C> comparator)
    {
        return comparator.compare(a, b) < 0 ? b : a;
    }

    /**
     * Returns the minimum of 2 comparable values. On ties, returns the first argument.
     */
    public static <T extends Comparable<? super T>> T min(T a, T b)
    {
        return a.compareTo(b) > 0 ? b : a;
    }

    /**
     * Returns the minimum of 2 values given a comparator of those values. On ties, returns the first argument.
     */
    public static <C, T extends C> T min(T a, T b, Comparator<C> comparator)
    {
        return comparator.compare(a, b) > 0 ? b : a;
    }
}