Java File Find findByExt(File base, String ext)

Description

find By Ext

License

Apache License

Declaration

public static File[] findByExt(File base, String ext) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.io.File;

import java.util.Vector;

public class Main {

    public static File[] findByExt(File base, String ext) {
        // searches recursively in base directory
        // for files that match the extension ext

        Vector result = new Vector();

        findByExtWorker(result, base, ext);

        // make generic array into a type-safe array
        Object objs[] = result.toArray();
        File files[] = new File[objs.length];
        System.arraycopy(objs, 0, files, 0, objs.length);

        return files;
    }/*from  w  w w . j av  a2s. c om*/

    private static void findByExtWorker(Vector result, File base, String ext) {
        File files[] = base.listFiles();
        if (files == null) {
            return;
        }

        for (int i = 0; i < files.length; i++) {
            File file = files[i];
            if (!file.isDirectory()) {
                if (ext.equals("*")) {
                    result.add(file);
                } else {
                    String currentExt = getFileExtension(file);
                    if (currentExt.equalsIgnoreCase(ext)) { // bingo; add to
                        // result set
                        result.add(file);
                    }

                }

            } else { // file is a directory, recurse
                findByExtWorker(result, file, ext);
            }
        }
    }

    public static boolean isDirectory(String fileName) {
        File testFile = new File(fileName);

        if ((testFile.exists()) && (testFile.isDirectory())) {
            return true;
        } else {
            return false;
        }
    }

    public static String getFileExtension(String filename) {
        // returns extension including .
        // Now strip of possible extension.

        String extension = "";
        int index = filename.lastIndexOf('.');
        if (index != -1)
            extension = filename.substring(index);

        return extension;
    }

    public static String getFileExtension(File file) {
        // returns extension including .

        // Strip of path first.
        String base = file.getName();
        // Now strip of possible extension.

        String extension = "";
        int index = base.lastIndexOf('.');
        if (index != -1)
            extension = base.substring(index);

        return extension;
    }

    public static String getFileExtension(String filename, boolean keepDot) {
        filename = filename.replace('\\', '/');

        String name;
        int namePos = filename.lastIndexOf('/');
        if (namePos != -1) {
            name = filename.substring(namePos + 1);
        } else {
            // no path info found
            name = filename;
        }

        String ext;
        int extPos = name.lastIndexOf('.');
        if (extPos != -1) {
            if (keepDot)
                ext = name.substring(extPos);
            else
                ext = name.substring(extPos + 1);
        } else {
            // no extension found
            ext = "";
        }

        return ext;
    }

    public static String getFileExtension(File file, boolean keepDot) {
        // Strip path first.
        String base = file.getName();

        String extension = "";
        int index = base.lastIndexOf('.');
        if (index != -1) {
            if (keepDot)
                extension = base.substring(index);
            else
                extension = base.substring(index + 1);
        }
        return extension;
    }
}

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