Checks whether a given path is a File, does not exist (unless allowOverwrite is true) and is writable - Java File Path IO

Java examples for File Path IO:File Path

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Description

Checks whether a given path is a File, does not exist (unless allowOverwrite is true) and is writable

Demo Code

/** //w w w .ja v  a2s.  c om
 * Copyright 2011-2012 Cray Inc. All Rights Reserved
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * * Neither the name Cray Inc. nor the names of its contributors may be
 *   used to endorse or promote products derived from this software
 *   without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 **/
//package com.java2s;
import java.io.File;
import java.io.FileWriter;

public class Main {
    public static void main(String[] argv) throws Exception {
        String filename = "java2s.com";
        boolean allowOverwrite = true;
        System.out.println(checkFile(filename, allowOverwrite));
    }

    /**
     * Checks whether a given path is a File, does not exist (unless {@code allowOverwrite} is true) and is writable
     * @param filename Filename to check
     * @param allowOverwrite Whether overwriting of existing files is allowed
     * @return True if the file is usable, false otherwise
     */
    public static boolean checkFile(String filename, boolean allowOverwrite) {
        File f = new File(filename);

        //Must not exist or allowOverwrite must be true
        if (f.exists() && !allowOverwrite)
            return false;

        //Must be a File if it exists (need exists check because isFile() will return false if path doesn't exist)
        if (f.exists() && !f.isFile())
            return false;

        //Make sure we can write to the file
        try {
            FileWriter fw = new FileWriter(f);
            fw.write("test");
            fw.close();
            f.delete();

            return true;
        } catch (Exception e) {
            return false;
        }
    }
}

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