Java JFileChooser Filter getMostRecentFile(File dir, java.io.FileFilter filter)

Description

Find the youngest file in the given directory that matches the given FileFilter .

License

Open Source License

Parameter

Parameter	Description
dir	The directory to search in.
filter	The FileFilter to be used to limit what files we look at (may be null).

Return

The most recent file (or null if none found).

Declaration

public static File getMostRecentFile(File dir, java.io.FileFilter filter) 

Method Source Code

//package com.java2s;
/*// w  w w  .  j a  v a  2s. c o m
 * Copyright 1997-2016 Unidata Program Center/University Corporation for Atmospheric Research
 * Copyright 2010-2015 Jeff McWhirter
 * 
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at
 * your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 * 
 */

import java.io.File;

public class Main {
    /**
     *  Find the youngest file in the given directory.
     *
     *  @param dir The directory to search in.
     *  @return The most recent file (or null if none found).
     */
    public static File getMostRecentFile(File dir) {
        return getMostRecentFile(dir, (java.io.FileFilter) null);
    }

    /**
     *  Find the youngest file in the given directory that matches the given {@link FileFilter}.
     *
     *  @param dir The directory to search in.
     *  @param filter The {@link FileFilter} to be used to limit what files we look at (may be null).
     *  @return The most recent file (or null if none found).
     */
    public static File getMostRecentFile(File dir, java.io.FileFilter filter) {
        if (!dir.isDirectory()) {
            throw new IllegalArgumentException("Not a directory:" + dir);
        }

        File[] list = ((filter == null) ? dir.listFiles() : dir.listFiles(filter));
        File latestFile = null;
        long latest = Long.MIN_VALUE;
        for (int i = 0; i < list.length; i++) {
            long tmp = list[i].lastModified();
            if (tmp > latest) {
                latestFile = list[i];
                latest = tmp;
            }
        }
        return latestFile;
    }

    /**
     *  Find the youngest file in the given directory that matches the given {@link FileFilter}.
     *
     *  @param dir The directory to search in.
     *  @param filter The filter to be used to limit what files we look at (may be null).
     *  @return The most recent file (or null if none found).
     */
    public static File getMostRecentFile(File dir, final javax.swing.filechooser.FileFilter filter) {
        return getMostRecentFile(dir, wrapFilter(filter));
    }

    /**
     * Create a javaio FileFilter from the filechooser package file filter.
     *
     * @param filter The filechooser file filter
     *
     * @return The javaio FileFilter.
     */
    public static java.io.FileFilter wrapFilter(final javax.swing.filechooser.FileFilter filter) {
        return new java.io.FileFilter() {
            public boolean accept(File f) {
                return ((filter == null) ? true : filter.accept(f));
            }
        };

    }
}

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