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The Apache Commons IO library contains utility classes, stream implementations, file filters, file comparators, endian transformation classes, and much more.

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/*
 * 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.commons.io.comparator;

import java.io.File;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

/**
 * Abstract file {@link Comparator} which provides sorting for file arrays and lists.
 *
 * @version $Id: AbstractFileComparator.java 1415850 2012-11-30 20:51:39Z ggregory $
 * @since 2.0
 */
abstract class AbstractFileComparator implements Comparator {

    /**
     * Sort an array of files.
     * 
     * This method uses {@link Arrays#sort(Object[], Comparator)}
     * and returns the original array.
     *
     * @param files The files to sort, may be null
     * @return The sorted array
     * @since 2.0
     */
    public File[] sort(final File... files) {
        if (files != null) {
            Arrays.sort(files, this);
        }
        return files;
    }

    /**
     * Sort a List of files.
     * 
     * This method uses {@link Collections#sort(List, Comparator)}
     * and returns the original list.
     *
     * @param files The files to sort, may be null
     * @return The sorted list
     * @since 2.0
     */
    public List sort(final List files) {
        if (files != null) {
            Collections.sort(files, this);
        }
        return files;
    }

    /**
     * String representation of this file comparator.
     *
     * @return String representation of this file comparator
     */
    @Override
    public String toString() {
        return getClass().getSimpleName();
    }
}