/*

 * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

import java.nio.file.*;

import java.nio.file.attribute.*;

import java.io.IOException;

import java.util.*;

/**

 * Unit test for Files.walkFileTree to test maxDepth parameter

 */

public class MaxDepth {

    public static void main(String[] args) throws Exception {

        final Path top = Paths.get(args[0]);

        for (int i=0; i<5; i++) {

            Set<FileVisitOption> opts = Collections.emptySet();

            final int maxDepth = i;

            Files.walkFileTree(top, opts, maxDepth, new SimpleFileVisitor<Path>() {

                // compute depth based on relative path to top directory

                private int depth(Path file) {

                    Path rp = file.relativize(top);

                    return (rp.getFileName().toString().equals("")) ? 0 : rp.getNameCount();

                }

                @Override

                public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) {

                    int d = depth(dir);

                    if (d == maxDepth)

                        throw new RuntimeException("Should not open directories at maxDepth");

                    if (d > maxDepth)

                        throw new RuntimeException("Too deep");

                    return FileVisitResult.CONTINUE;

                }

                @Override

                public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {

                    int d = depth(file);

                    if (d > maxDepth)

                        throw new RuntimeException("Too deep");

                    return FileVisitResult.CONTINUE;

                }

            });

        }

    }

}