Java Directory Clear cleanDirectory(File directory)

Description

Cleans a directory without deleting it.

License

Open Source License

Parameter

Parameter	Description
directory	directory to clean

Exception

Parameter	Description
IOException	in case cleaning is unsuccessful

Declaration

public static void cleanDirectory(File directory) throws IOException 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.io.*;

public class Main {
    /**/*from  w  ww  . j av  a2  s.c  o  m*/
     * Cleans a directory without deleting it.
     *
     * @param directory directory to clean
     * @throws IOException in case cleaning is unsuccessful
     */
    public static void cleanDirectory(File directory) throws IOException {
        if (!directory.exists()) {
            throw new IllegalArgumentException(directory + " does not exist");
        }

        if (!directory.isDirectory()) {
            throw new IllegalArgumentException(directory + " is not a directory");
        }

        File[] files = directory.listFiles();
        if (files == null) { // null if security restricted
            throw new IOException("Failed to list contents of " + directory);
        }

        IOException exception = null;
        for (File file : files) {
            try {
                forceDelete(file);
            } catch (IOException ioe) {
                exception = ioe;
            }
        }

        if (null != exception) {
            throw exception;
        }
    }

    /**
     * Deletes a file. If file is a directory, delete it and all sub-directories.
     * <p/>
     * The difference between File.delete() and this method are:
     * <ul>
     * <li>A directory to be deleted does not have to be empty.</li>
     * <li>You get exceptions when a file or directory cannot be deleted.
     * (java.io.File methods returns a boolean)</li>
     * </ul>
     *
     * @param file file or directory to delete, must not be <code>null</code>
     * @throws NullPointerException  if the directory is <code>null</code>
     * @throws FileNotFoundException if the file was not found
     * @throws IOException           in case deletion is unsuccessful
     */
    public static void forceDelete(File file) throws IOException {
        if (file.isDirectory()) {
            deleteDirectory(file);
        } else {
            boolean filePresent = file.exists();
            if (!file.delete()) {
                if (!filePresent) {
                    throw new FileNotFoundException("File does not exist: " + file);
                }
                throw new IOException("Unable to delete file: " + file);
            }
        }
    }

    /**
     * Deletes a directory recursively.
     *
     * @param directory directory to delete
     * @throws IOException in case deletion is unsuccessful
     */
    public static void deleteDirectory(File directory) throws IOException {
        if (!directory.exists()) {
            return;
        }
        cleanDirectory(directory);
        if (!directory.delete()) {
            throw new IOException("Unable to delete directory: " + directory);
        }
    }
}

Related

1. cleanDirectory(File directory)
2. cleanDirectory(File directory)
3. cleanDirectory(File directory)
4. cleanDirectory(File directory)
5. cleanDirectory(File directory)
6. cleanDirectory(File directory)
7. cleanDirectory(File directory)
8. cleanDirectory(File path)
9. cleanDirectory(final File directory)