Makes a directory, including any necessary but nonexistent parent directories. - Java File Path IO

Java examples for File Path IO:Directory

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Description

Makes a directory, including any necessary but nonexistent parent directories.

Demo Code

/*/*  ww  w.  ja v  a2 s.c o  m*/
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */
//package com.java2s;

import java.io.File;

import java.io.IOException;

public class Main {
    public static void main(String[] argv) throws Exception {
        File directory = new File("Main.java");
        forceMkdir(directory);
    }

    /**
     * Makes a directory, including any necessary but nonexistent parent
     * directories. If a file already exists with specified name but it is
     * not a directory then an IOException is thrown.
     * If the directory cannot be created (or does not already exist)
     * then an IOException is thrown.
     *
     * @param directory  directory to create, must not be <code>null</code>
     * @throws NullPointerException if the directory is <code>null</code>
     * @throws IOException if the directory cannot be created or the file already exists but is not a directory
     */
    public static void forceMkdir(File directory) throws IOException {
        if (directory.exists()) {
            if (!directory.isDirectory()) {
                String message = "File " + directory + " exists and is "
                        + "not a directory. Unable to create directory.";
                throw new IOException(message);
            }
        } else {
            if (!directory.mkdirs()) {
                // Double-check that some other thread or process hasn't made
                // the directory in the background
                if (!directory.isDirectory()) {
                    String message = "Unable to create directory "
                            + directory;
                    throw new IOException(message);
                }
            }
        }
    }
}

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