Android Open Source - android-heavy-list File Utils

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License

The source code is released under:

Apache License

Java Source Code

package com.m039.wf;
//from   w  w w  . j  a va 2s.  co  m
import java.io.File;
import java.io.FilenameFilter;

import java.util.ArrayList;
import java.util.List;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
* Created: 25 March 2012
*
* @author <a href="mailto:flam44@gmail.com">Mozgin Dmitry</a>
* @version 1.0
*/

public class FileUtils
{
    static List<File>       findFiles(String root, final String[] extensions) {
        final File file = new File(root);

        if (!file.isDirectory())
            return null;

        final FilenameFilter extf, dirf;

        extf = new FilenameFilter() {
                Pattern p;

                {
                    p = Pattern.compile("\\.(" + join(extensions, "|") + ")$");
                }

                public boolean accept (File dir, String filename) {
                    return p.matcher(filename).find();
                }
            };

        dirf = new FilenameFilter() {
                public boolean accept (File dir, String filename) {
                    return new File(dir, filename).isDirectory();
                }
            };


        final List<File> res = new ArrayList<File>();

        new Runnable() {
            public void run() {
                add(file);
            }

            void add(File root) {
                for (File f : root.listFiles(extf)) {
                    res.add(f);
                }

                for (File d : root.listFiles(dirf)) {
                    add(d);
                }
            }
        }.run();

        return res;
    }

    static String           join(String [] strs, String separator) {
        if (strs == null || strs.length <= 0)
            return null;

        if (strs.length == 1)
            return strs[0];

        StringBuilder sb = new StringBuilder();

        for (int i = 0; i < strs.length - 1; i++) {
            sb.append(strs[i]);
            sb.append(separator);
        }

        sb.append(strs[strs.length - 1]);

        return sb.toString();
    }

    /**
     * Taken from SO
     */
    static void delete(File fileOrDirectory) {
        if (fileOrDirectory.isDirectory())
            for (File child : fileOrDirectory.listFiles())
                delete(child);

        fileOrDirectory.delete();
    }

}

Java Source Code List

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