/*

 * 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.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun in the LICENSE file that accompanied this code.

 *

 * 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.

 */

package sun.nio.fs;

import java.nio.file.*;

import java.nio.file.attribute.*;

import java.nio.file.spi.FileSystemProvider;

import java.nio.channels.*;

import java.net.URI;

import java.util.concurrent.ExecutorService;

import java.io.IOException;

import java.util.*;

import sun.nio.ch.ThreadPool;

/**

 * Base implementation of FileSystemProvider

 */

public abstract class UnixFileSystemProvider

    extends FileSystemProvider

{

    private static final String USER_DIR = "user.dir";

    private final UnixFileSystem theFileSystem;

    public UnixFileSystemProvider() {

        String userDir = System.getProperty(USER_DIR);

        theFileSystem = newFileSystem(userDir);

    }

    /**

     * Constructs a new file system using the given default directory.

     */

    abstract UnixFileSystem newFileSystem(String dir);

    @Override

    public final String getScheme() {

        return "file";

    }

    private void checkUri(URI uri) {

        if (!uri.getScheme().equalsIgnoreCase(getScheme()))

            throw new IllegalArgumentException("URI does not match this provider");

        if (uri.getAuthority() != null)

            throw new IllegalArgumentException("Authority component present");

        if (uri.getPath() == null)

            throw new IllegalArgumentException("Path component is undefined");

        if (!uri.getPath().equals("/"))

            throw new IllegalArgumentException("Path component should be '/'");

        if (uri.getQuery() != null)

            throw new IllegalArgumentException("Query component present");

        if (uri.getFragment() != null)

            throw new IllegalArgumentException("Fragment component present");

    }

    @Override

    public final FileSystem newFileSystem(URI uri, Map<String,?> env) {

        checkUri(uri);

        throw new FileSystemAlreadyExistsException();

    }

    @Override

    public final FileSystem getFileSystem(URI uri) {

        checkUri(uri);

        return theFileSystem;

    }

    @Override

    public Path getPath(URI uri) {

        return UnixUriUtils.fromUri(theFileSystem, uri);

    }

        if (obj == null)

            throw new NullPointerException();

        if (!(obj instanceof UnixPath))

            throw new ProviderMismatchException();

        return (UnixPath)obj;

    }

    @Override

        throws IOException

    {

        UnixPath file = checkPath(obj);

        int mode = UnixFileModeAttribute

            .toUnixMode(UnixFileModeAttribute.ALL_READWRITE, attrs);

        try {

            return UnixChannelFactory.newFileChannel(file, options, mode);

        } catch (UnixException x) {

            x.rethrowAsIOException(file);

            return null;

        }

    }

    @Override

    {

        UnixPath file = checkPath(obj);

        int mode = UnixFileModeAttribute

            .toUnixMode(UnixFileModeAttribute.ALL_READWRITE, attrs);

        ThreadPool pool = (executor == null) ? null : ThreadPool.wrap(executor, 0);

        try {

            return UnixChannelFactory

                .newAsynchronousFileChannel(file, options, mode, pool);

        } catch (UnixException x) {

            x.rethrowAsIOException(file);

            return null;

        }

    }

}