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.File;

import java.io.FileNotFoundException;

import java.io.IOException;

public class Main {
    /**//  w  ww.j  a va  2 s.c  o  m
     * Deletes a file. If file is a directory, delete net 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);
                }
                String message = "Unable to delete file: " + file;
                throw new IOException(message);
            }
        }
    }

    /**
     * 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;
        }

        if (!isSymlink(directory)) {
            cleanDirectory(directory);
        }

        if (!directory.delete()) {
            String message = "Unable to delete directory " + directory + ".";
            throw new IOException(message);
        }
    }

    /**
     * Determines whether the specified file is a Symbolic Link rather than an
     * actual file.
     * <p>
     * Will not return true if there is a Symbolic Link anywhere in the path, only
     * if the specific file is.
     * @param file the file to check
     * @return true if the file is a Symbolic Link
     * @throws IOException if an IO error occurs while checking the file
     * @since Commons IO 2.0
     */
    public static boolean isSymlink(File file) throws IOException {
        if (file == null) {
            throw new NullPointerException("File must not be null");
        }

        /*
         * if (FilenameUtils.isSystemWindows()) { return false; }
         */

        File fileInCanonicalDir = null;
        if (file.getParent() == null) {
            fileInCanonicalDir = file;
        } else {
            File canonicalDir = file.getParentFile().getCanonicalFile();
            fileInCanonicalDir = new File(canonicalDir, file.getName());
        }

        if (fileInCanonicalDir.getCanonicalFile().equals(fileInCanonicalDir.getAbsoluteFile())) {
            return false;
        } else {
            return true;
        }
    }

    /**
     * Cleans a directory without deleting net.
     * @param directory directory to clean
     * @throws IOException in case cleaning is unsuccessful
     */
    public static void cleanDirectory(File directory) throws IOException {
        if (!directory.exists()) {
            String message = directory + " does not exist";
            throw new IllegalArgumentException(message);
        }

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

        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 file)
7. forceDelete(File path)
8. forceDelete(final File file)
9. forceDelete(final File file)