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Java example source code file (FileAttributes.java)

This example Java source code file (FileAttributes.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

assertion, fileattributes, filetime, hashset, illegalargumentexception, ioexception, map, nullpointerexception, object, path, runtimeexception, set, string, threading, threads, unsupportedoperationexception, util

The FileAttributes.java Java example source code

/*
 * Copyright (c) 2008, 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 6838333 7017446
 * @summary Unit test for java.nio.file.Files
 * @library ..
 */

import java.nio.file.*;
import java.nio.file.attribute.*;
import java.io.IOException;
import java.util.*;
import java.util.concurrent.TimeUnit;

/**
 * Exercises getAttribute/setAttribute/readAttributes methods.
 */

public class FileAttributes {

    static void assertTrue(boolean okay) {
        if (!okay)
            throw new RuntimeException("Assertion Failed");
    }

    static void checkEqual(Object o1, Object o2) {
        if (o1 == null) {
            assertTrue(o2 == null);
        } else {
            assertTrue (o1.equals(o2));
        }
    }

    // checks that two time values are within 1s of each other
    static void checkNearEqual(FileTime t1, FileTime t2) {
        long diff = Math.abs(t1.toMillis() - t2.toMillis());
        assertTrue(diff <= 1000);
    }

    // Exercise getAttribute/setAttribute/readAttributes on basic attributes
    static void checkBasicAttributes(Path file, BasicFileAttributes attrs)
        throws IOException
    {
        // getAttribute
        checkEqual(attrs.size(), Files.getAttribute(file, "size"));
        checkEqual(attrs.lastModifiedTime(), Files.getAttribute(file, "basic:lastModifiedTime"));
        checkEqual(attrs.lastAccessTime(), Files.getAttribute(file, "lastAccessTime"));
        checkEqual(attrs.creationTime(), Files.getAttribute(file, "basic:creationTime"));
        assertTrue((Boolean)Files.getAttribute(file, "isRegularFile"));
        assertTrue(!(Boolean)Files.getAttribute(file, "basic:isDirectory"));
        assertTrue(!(Boolean)Files.getAttribute(file, "isSymbolicLink"));
        assertTrue(!(Boolean)Files.getAttribute(file, "basic:isOther"));
        checkEqual(attrs.fileKey(), Files.getAttribute(file, "basic:fileKey"));

        // setAttribute
        FileTime modTime = attrs.lastModifiedTime();
        Files.setAttribute(file, "basic:lastModifiedTime", FileTime.fromMillis(0L));
        checkEqual(Files.getLastModifiedTime(file),
                   FileTime.fromMillis(0L));
        Files.setAttribute(file, "lastModifiedTime", modTime);
        checkEqual(Files.getLastModifiedTime(file), modTime);

        Map<String,Object> map;
        map = Files.readAttributes(file, "*");
        assertTrue(map.size() >= 9);
        checkEqual(attrs.isRegularFile(), map.get("isRegularFile")); // check one

        map = Files.readAttributes(file, "basic:*");
        assertTrue(map.size() >= 9);
        checkEqual(attrs.lastAccessTime(), map.get("lastAccessTime")); // check one

        map = Files.readAttributes(file, "size,lastModifiedTime");
        assertTrue(map.size() == 2);
        checkEqual(attrs.size(), map.get("size"));
        checkEqual(attrs.lastModifiedTime(), map.get("lastModifiedTime"));
    }

    // Exercise getAttribute/setAttribute/readAttributes on posix attributes
    static void checkPosixAttributes(Path file, PosixFileAttributes attrs)
        throws IOException
    {
        checkBasicAttributes(file, attrs);

        // getAttribute
        checkEqual(attrs.permissions(), Files.getAttribute(file, "posix:permissions"));
        checkEqual(attrs.owner(), Files.getAttribute(file, "posix:owner"));
        checkEqual(attrs.group(), Files.getAttribute(file, "posix:group"));

        // setAttribute
        Set<PosixFilePermission> orig = attrs.permissions();
        Set<PosixFilePermission> newPerms = new HashSet<>(orig);
        newPerms.remove(PosixFilePermission.OTHERS_READ);
        newPerms.remove(PosixFilePermission.OTHERS_WRITE);
        newPerms.remove(PosixFilePermission.OTHERS_EXECUTE);
        Files.setAttribute(file, "posix:permissions", newPerms);
        checkEqual(Files.getPosixFilePermissions(file), newPerms);
        Files.setAttribute(file, "posix:permissions", orig);
        checkEqual(Files.getPosixFilePermissions(file), orig);
        Files.setAttribute(file, "posix:owner", attrs.owner());
        Files.setAttribute(file, "posix:group", attrs.group());

        // readAttributes
        Map<String,Object> map;
        map = Files.readAttributes(file, "posix:*");
        assertTrue(map.size() >= 12);
        checkEqual(attrs.permissions(), map.get("permissions")); // check one

        map = Files.readAttributes(file, "posix:size,owner");
        assertTrue(map.size() == 2);
        checkEqual(attrs.size(), map.get("size"));
        checkEqual(attrs.owner(), map.get("owner"));
    }

    // Exercise getAttribute/readAttributes on unix attributes
    static void checkUnixAttributes(Path file) throws IOException {
        // getAttribute
        int mode = (Integer)Files.getAttribute(file, "unix:mode");
        long ino = (Long)Files.getAttribute(file, "unix:ino");
        long dev = (Long)Files.getAttribute(file, "unix:dev");
        long rdev = (Long)Files.getAttribute(file, "unix:rdev");
        int nlink = (Integer)Files.getAttribute(file, "unix:nlink");
        int uid = (Integer)Files.getAttribute(file, "unix:uid");
        int gid = (Integer)Files.getAttribute(file, "unix:gid");
        FileTime ctime = (FileTime)Files.getAttribute(file, "unix:ctime");

        // readAttributes
        Map<String,Object> map;
        map = Files.readAttributes(file, "unix:*");
        assertTrue(map.size() >= 20);

        map = Files.readAttributes(file, "unix:size,uid,gid");
        assertTrue(map.size() == 3);
        checkEqual(map.get("size"),
                   Files.readAttributes(file, BasicFileAttributes.class).size());
    }

    // Exercise getAttribute/setAttribute on dos attributes
    static void checkDosAttributes(Path file, DosFileAttributes attrs)
        throws IOException
    {
        checkBasicAttributes(file, attrs);

        // getAttribute
        checkEqual(attrs.isReadOnly(), Files.getAttribute(file, "dos:readonly"));
        checkEqual(attrs.isHidden(), Files.getAttribute(file, "dos:hidden"));
        checkEqual(attrs.isSystem(), Files.getAttribute(file, "dos:system"));
        checkEqual(attrs.isArchive(), Files.getAttribute(file, "dos:archive"));

        // setAttribute
        boolean value;

        value = attrs.isReadOnly();
        Files.setAttribute(file, "dos:readonly", !value);
        checkEqual(Files.readAttributes(file, DosFileAttributes.class).isReadOnly(), !value);
        Files.setAttribute(file, "dos:readonly", value);
        checkEqual(Files.readAttributes(file, DosFileAttributes.class).isReadOnly(), value);

        value = attrs.isHidden();
        Files.setAttribute(file, "dos:hidden", !value);
        checkEqual(Files.readAttributes(file, DosFileAttributes.class).isHidden(), !value);
        Files.setAttribute(file, "dos:hidden", value);
        checkEqual(Files.readAttributes(file, DosFileAttributes.class).isHidden(), value);

        value = attrs.isSystem();
        Files.setAttribute(file, "dos:system", !value);
        checkEqual(Files.readAttributes(file, DosFileAttributes.class).isSystem(), !value);
        Files.setAttribute(file, "dos:system", value);
        checkEqual(Files.readAttributes(file, DosFileAttributes.class).isSystem(), value);

        value = attrs.isArchive();
        Files.setAttribute(file, "dos:archive", !value);
        checkEqual(Files.readAttributes(file, DosFileAttributes.class).isArchive(), !value);
        Files.setAttribute(file, "dos:archive", value);
        checkEqual(Files.readAttributes(file, DosFileAttributes.class).isArchive(), value);

        // readAttributes
        Map<String,Object> map;
        map = Files.readAttributes(file, "dos:*");
        assertTrue(map.size() >= 13);
        checkEqual(attrs.isReadOnly(), map.get("readonly")); // check one

        map = Files.readAttributes(file, "dos:size,hidden");
        assertTrue(map.size() == 2);
        checkEqual(attrs.size(), map.get("size"));
        checkEqual(attrs.isHidden(), map.get("hidden"));
    }

    static void checkBadSet(Path file, String attribute, Object value)
        throws IOException
    {
        try {
            Files.setAttribute(file, attribute, 0);
            throw new RuntimeException("IllegalArgumentException expected");
        } catch (IllegalArgumentException ignore) { }
    }

    static void checkBadGet(Path file, String attribute) throws IOException {
        try {
            Files.getAttribute(file, attribute);
            throw new RuntimeException("IllegalArgumentException expected");
        } catch (IllegalArgumentException ignore) { }
    }

    static void checkBadRead(Path file, String attribute) throws IOException {
        try {
            Files.readAttributes(file, attribute);
            throw new RuntimeException("IllegalArgumentException expected");
        } catch (IllegalArgumentException ignore) { }
    }

    static void miscTests(Path file) throws IOException {
        // unsupported views
        try {
            Files.setAttribute(file, "foo:bar", 0);
            throw new RuntimeException("UnsupportedOperationException expected");
        } catch (UnsupportedOperationException ignore) { }
        try {
            Files.getAttribute(file, "foo:bar");
            throw new RuntimeException("UnsupportedOperationException expected");
        } catch (UnsupportedOperationException ignore) { }
        try {
            Files.readAttributes(file, "foo:*");
            throw new RuntimeException("UnsupportedOperationException expected");
        } catch (UnsupportedOperationException ignore) { }

        // bad args
        checkBadSet(file, "", 0);
        checkBadSet(file, "basic:", 0);
        checkBadSet(file, "basic:foobar", 0);
        checkBadGet(file, "");
        checkBadGet(file, "basic:");
        checkBadGet(file, "basic:foobar");
        checkBadGet(file, "basic:size,lastModifiedTime");
        checkBadGet(file, "basic:*");
        checkBadRead(file, "");
        checkBadRead(file, "basic:");
        checkBadRead(file, "basic:foobar");
        checkBadRead(file, "basic:size,foobar");

        // nulls
        try {
            Files.getAttribute(file, null);
            throw new RuntimeException("NullPointerException expected");
        } catch (NullPointerException npe) { }
        try {
            Files.getAttribute(file, "isRegularFile", (LinkOption[])null);
            throw new RuntimeException("NullPointerException expected");
        } catch (NullPointerException npe) { }
        try {
            Files.setAttribute(file, null, 0L);
            throw new RuntimeException("NullPointerException expected");
        } catch (NullPointerException npe) { }
    }

    static void doTests(Path dir) throws IOException {
        Path file = dir.resolve("foo");
        Files.createFile(file);
        FileStore store = Files.getFileStore(file);
        try {
            checkBasicAttributes(file,
                Files.readAttributes(file, BasicFileAttributes.class));

            if (store.supportsFileAttributeView("posix"))
                checkPosixAttributes(file,
                    Files.readAttributes(file, PosixFileAttributes.class));

            if (store.supportsFileAttributeView("unix"))
                checkUnixAttributes(file);

            if (store.supportsFileAttributeView("dos"))
                checkDosAttributes(file,
                    Files.readAttributes(file, DosFileAttributes.class));

            miscTests(file);
        } finally {
            Files.delete(file);
        }
    }


    public static void main(String[] args) throws IOException {
        Path dir = TestUtil.createTemporaryDirectory();
        try {
            doTests(dir);
        } finally {
            TestUtil.removeAll(dir);
        }
    }
}

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