/*
 * Copyright (c) 2008, 2009, 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package sun.nio.fs;

import java.nio.file.*;
import java.nio.file.spi.*;
import java.nio.file.attribute.*;
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;

public class WindowsFileSystemProvider
    extends FileSystemProvider
{
    private static final String USER_DIR = "user.dir";
    private final WindowsFileSystem theFileSystem;

    public WindowsFileSystemProvider() {
        theFileSystem = new WindowsFileSystem(this, System.getProperty(USER_DIR));
    }

    @Override
    public 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 FileSystem newFileSystem(URI uri, Map<String,?> env)
        throws IOException
    {
        checkUri(uri);
        throw new FileSystemAlreadyExistsException();
    }

    @Override
    public final FileSystem getFileSystem(URI uri) {
        checkUri(uri);
        return theFileSystem;
    }

    @Override
    public Path getPath(URI uri) {
        return WindowsUriSupport.fromUri(theFileSystem, uri);
    }

    @Override
    public FileChannel newFileChannel(Path path,
                                      Set<? extends OpenOption> options,
                                      FileAttribute<?>... attrs)
        throws IOException
    {
        if (path == null)
            throw new NullPointerException();
        if (!(path instanceof WindowsPath))
            throw new ProviderMismatchException();
        WindowsPath file = (WindowsPath)path;

        WindowsSecurityDescriptor sd = WindowsSecurityDescriptor.fromAttribute(attrs);
        try {
            return WindowsChannelFactory
                .newFileChannel(file.getPathForWin32Calls(),
                                file.getPathForPermissionCheck(),
                                options,
                                sd.address());
        } catch (WindowsException x) {
            x.rethrowAsIOException(file);
            return null;
        } finally {
            if (sd != null)
                sd.release();
        }
    }

    @Override
    public AsynchronousFileChannel newAsynchronousFileChannel(Path path,
                                                              Set<? extends OpenOption> options,
                                                              ExecutorService executor,
                                                              FileAttribute<?>... attrs)
        throws IOException
    {
        if (path == null)
            throw new NullPointerException();
        if (!(path instanceof WindowsPath))
            throw new ProviderMismatchException();
        WindowsPath file = (WindowsPath)path;
        ThreadPool pool = (executor == null) ? null : ThreadPool.wrap(executor, 0);
        WindowsSecurityDescriptor sd =
            WindowsSecurityDescriptor.fromAttribute(attrs);
        try {
            return WindowsChannelFactory
                .newAsynchronousFileChannel(file.getPathForWin32Calls(),
                                            file.getPathForPermissionCheck(),
                                            options,
                                            sd.address(),
                                            pool);
        } catch (WindowsException x) {
            x.rethrowAsIOException(file);
            return null;
        } finally {
            if (sd != null)
                sd.release();
        }
    }
}