org.cinchapi.concourse.util.NaturalSorter.java Source code

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Here is the source code for org.cinchapi.concourse.util.NaturalSorter.java

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/*
 * The MIT License (MIT)
 * 
 * Copyright (c) 2013-2014 Jeff Nelson, Cinchapi Software Collective
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.cinchapi.concourse.util;

import java.io.File;
import java.util.Comparator;

import com.google.common.primitives.Longs;

/**
 * A {@link Comparator} that sorts files with strictly numerical names between 0
 * and 2^63 - 1 (i.e. a timestamp).
 * 
 * @author jnelson
 */
public enum NaturalSorter implements Comparator<File> {
    INSTANCE;

    @Override
    public int compare(File f1, File f2) {
        String[] s1 = f1.getName().split("\\.");
        String[] s2 = f2.getName().split("\\.");
        int result;
        return (result = Longs.compare(Long.parseLong(s1[0]), Long.parseLong(s2[0]))) == 0 ? s1[1].compareTo(s2[1])
                : result;
    }

}