Quelle Nulls.java Sprache: JAVA

/*
* Copyright (c) 2011, Oracle and/or its affiliates. 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 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 6865748
* @summary Unit test for java.nio.file.Files.walkFileTree
*/

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

public class Nulls {

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

    public static void main(String[] args) throws IOException {
        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<>(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;
        Path dir = Paths.get(".");
        BasicFileAttributes attrs = Files.readAttributes(dir, BasicFileAttributes.class);

        try { visitor.preVisitDirectory(null, attrs);
        } catch (NullPointerException x0) {
        try { visitor.preVisitDirectory(dir, null);
        } catch (NullPointerException x1) {
        try { visitor.visitFile(null, attrs);
        } catch (NullPointerException x2) {
        try {  visitor.visitFile(dir, null);
        } catch (NullPointerException x3) {
        try { visitor.visitFileFailed(null, new IOException());
        } catch (NullPointerException x4) {
        try { visitor.visitFileFailed(dir, null);
        } catch (NullPointerException x5) {
        try { visitor.postVisitDirectory(null, new IOException());
        } catch (NullPointerException x6) {
            // 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");
    }
}

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