/*

 * Copyright 2008-2009 Sun Microsystems, Inc.  All Rights Reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

import java.nio.file.*;

import java.nio.file.attribute.BasicFileAttributes;

import java.util.Random;

import java.io.IOException;

public class TestUtil {

    private TestUtil() {

    }

    public static Path createTemporaryDirectory() throws IOException {

        Path tmpdir = Paths.get(System.getProperty("java.io.tmpdir"));

        Random r = new Random();

        Path dir;

        do {

            dir = tmpdir.resolve("name" + r.nextInt());

        } while (dir.exists());

        return dir.createDirectory();

    }

    static void removeAll(Path dir) {

        Files.walkFileTree(dir, new FileVisitor<Path>() {

            @Override

            public FileVisitResult preVisitDirectory(Path dir) {

                return FileVisitResult.CONTINUE;

            }

            @Override

            public FileVisitResult preVisitDirectoryFailed(Path dir, IOException exc) {

                System.err.format("Error occured accessing directory %s\n", dir, exc);

                return FileVisitResult.CONTINUE;

            }

            @Override

            public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {

                try {

                    file.delete(false);

                } catch (IOException x) {

                    System.err.format("Unable to delete %s: %s\n", file, x);

                }

                return FileVisitResult.CONTINUE;

            }

            @Override

            public FileVisitResult postVisitDirectory(Path dir, IOException exc) {

                try {

                    dir.delete(false);

                } catch (IOException x) {

                    System.err.format("Unable to delete %s: %s\n", dir, x);

                }

                return FileVisitResult.CONTINUE;

            }

            @Override

            public FileVisitResult visitFileFailed(Path file, IOException exc) {

                System.err.format("Unable to visit %s: %s\n", file, exc);

                return FileVisitResult.CONTINUE;

            }

        });

    }

    static void deleteUnchecked(FileRef file) {

        try {

            file.delete();

        } catch (IOException exc) {

            System.err.format("Unable to delete %s: %s\n", file, exc);

        }

    }

    /**

     * Creates a directory tree in the given directory so that the total

     * size of the path is more than 2k in size. This is used for long

     * path tests on Windows.

     */

    static Path createDirectoryWithLongPath(Path dir)

        throws IOException

    {

        StringBuilder sb = new StringBuilder();

        for (int i=0; i<240; i++) {

            sb.append('A');

        }

        String name = sb.toString();

        do {

            dir = dir.resolve(name).resolve(".");

            dir.createDirectory();

        } while (dir.toString().length() < 2048);

        return dir;

    }

    /**

     * Returns true if symbolic links are supported

     */

    static boolean supportsLinks(Path dir) {

        Path link = dir.resolve("testlink");

        Path target = dir.resolve("testtarget");

        try {

            link.createSymbolicLink(target);

            target.delete(false);

            return true;

        } catch (UnsupportedOperationException x) {

            return false;

        } catch (IOException x) {

            return false;

        }

    }

}