Java Force Delete forceDelete(File file)

Description

Deletes a file.

License

Open Source License

Parameter

Parameter	Description
file	file or directory to delete, must not be <code>null</code>

Exception

Parameter	Description
NullPointerException	if the directory is <code>null</code>
FileNotFoundException	if the file was not found
IOException	in case deletion is unsuccessful

Declaration

public static void forceDelete(File file) throws IOException 

Method Source Code

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

import java.io.*;

public class Main {
    /**/*  w w w.  j  a  v a  2 s.c  om*/
     * 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);
        }
    }

    /**
     * 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;
        }
    }
}

Related

1. forceDelete(File file)
2. forceDelete(File file)
3. forceDelete(File file)
4. forceDelete(File file)
5. forceDelete(File file)
6. forceDelete(File path)
7. forceDelete(final File file)
8. forceDelete(final File file)