test/java/nio/file/Files/Misc.java

/*
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 * 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.
 */

/* @test
 * @bug 4313887 6838333 6865748
 * @summary Unit test for java.nio.file.Files for miscellenous cases not
 *   covered by other tests
 * @library ..
 */

import java.nio.file.*;
import java.nio.file.attribute.Attributes;
import java.io.IOException;
import java.util.*;

public class Misc {

    static void npeExpected() {
        throw new RuntimeException("NullPointerException expected");
    }

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

        // -- Files.createDirectories --

        Path dir = TestUtil.createTemporaryDirectory();
        try {
            // no-op
            Files.createDirectories(dir);

            // create one directory
            Path subdir = dir.resolve("a");
            Files.createDirectories(subdir);
            if (!subdir.exists())
                throw new RuntimeException("directory not created");

            // create parents
            subdir = subdir.resolve("b/c/d");
            Files.createDirectories(subdir);
            if (!subdir.exists())
                throw new RuntimeException("directory not created");

            // existing file is not a directory
            Path file = dir.resolve("x").createFile();
            try {
                Files.createDirectories(file);
                throw new RuntimeException("failure expected");
            } catch (FileAlreadyExistsException x) { }
            try {
                Files.createDirectories(file.resolve("y"));
                throw new RuntimeException("failure expected");
            } catch (IOException x) { }

        } finally {
            TestUtil.removeAll(dir);
        }

        // --- NullPointerException --

        try {
            Files.probeContentType(null);
            npeExpected();
        } catch (NullPointerException e) {
        }
        try {
            Files.walkFileTree(null, EnumSet.noneOf(FileVisitOption.class),
                Integer.MAX_VALUE, new SimpleFileVisitor<Path>(){});
            npeExpected();
        } catch (NullPointerException e) {
        }
        try {
            Files.walkFileTree(Paths.get("."), null, Integer.MAX_VALUE,
                new SimpleFileVisitor<Path>(){});
            npeExpected();
        } catch (NullPointerException e) {
        }
        try {
            Files.walkFileTree(Paths.get("."), EnumSet.noneOf(FileVisitOption.class),
                -1, new SimpleFileVisitor<Path>(){});
            throw new RuntimeException("IllegalArgumentExpected expected");
        } catch (IllegalArgumentException e) {
        }
        try {
            Set<FileVisitOption> opts = new HashSet<FileVisitOption>(1);
            opts.add(null);
            Files.walkFileTree(Paths.get("."), opts, Integer.MAX_VALUE,
                new SimpleFileVisitor<Path>(){});
            npeExpected();
        } catch (NullPointerException e) {
        }
        try {
            Files.walkFileTree(Paths.get("."), EnumSet.noneOf(FileVisitOption.class),
                Integer.MAX_VALUE, null);
            npeExpected();
        } catch (NullPointerException e) {
        }

        SimpleFileVisitor<Path> visitor = new SimpleFileVisitor<Path>() { };
        boolean ranTheGauntlet = false;
        try { visitor.preVisitDirectory(null);
        } catch (NullPointerException x0) {
        try { visitor.preVisitDirectoryFailed(null, new IOException());
        } catch (NullPointerException x1) {
        try { visitor.preVisitDirectoryFailed(dir, null);
        } catch (NullPointerException x2) {
        try { visitor.visitFile(null, Attributes.readBasicFileAttributes(Paths.get(".")));
        } catch (NullPointerException x3) {
        try {  visitor.visitFile(dir, null);
        } catch (NullPointerException x4) {
        try { visitor.visitFileFailed(null, new IOException());
        } catch (NullPointerException x5) {
        try { visitor.visitFileFailed(dir, null);
        } catch (NullPointerException x6) {
        try { visitor.postVisitDirectory(null, new IOException());
        } catch (NullPointerException x7) {
            // if we get here then all visit* methods threw NPE as expected
            ranTheGauntlet = true;
        }}}}}}}}
        if (!ranTheGauntlet)
            throw new RuntimeException("A visit method did not throw NPE");
    }
}