Java Folder Delete emptyFolder(final File folder)

Description

empty Folder

License

Apache License

Declaration

public static void emptyFolder(final File folder) throws IOException 

Method Source Code

//package com.java2s;
/*//  ww w. j a v  a2s  .  c o m
 * Copyright (C) 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.File;
import java.io.IOException;

public class Main {
    public static void emptyFolder(final File folder) throws IOException {
        deleteFolder(folder);
        if (!folder.mkdirs()) {
            throw new IOException(String.format(
                    "Could not create empty folder %s", folder));
        }
    }

    public static void deleteFolder(final File folder) throws IOException {
        if (!folder.exists()) {
            return;
        }
        File[] files = folder.listFiles();
        if (files != null) { // i.e. is a directory.
            for (final File file : files) {
                deleteFolder(file);
            }
        }
        if (!folder.delete()) {
            throw new IOException(String.format(
                    "Could not delete folder %s", folder));
        }
    }

    public static void mkdirs(File folder) {
        // attempt to create first.
        // if failure only throw if folder does not exist.
        // This makes this method able to create the same folder(s) from different thread
        if (!folder.mkdirs() && !folder.exists()) {
            throw new RuntimeException("Cannot create directory " + folder);
        }
    }

    public static void delete(File file) throws IOException {
        boolean result = file.delete();
        if (!result) {
            throw new IOException("Failed to delete "
                    + file.getAbsolutePath());
        }
    }
}

Related

1. emptyFolder(File dir)
2. emptyFolder(File folder)
3. emptyFolder(File folder)
4. emptyFolder(File folder, boolean ignoreCannotDel)
5. emptyFolder(File toEmpty)
6. emptyFolder(final File folder)