/*

 * 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.attribute.*;

import java.util.*;

import java.io.IOException;

/**

 * An implementation of FileOwnerAttributeView that delegates to a given

 * PosixFileAttributeView or AclFileAttributeView object.

 */

final class FileOwnerAttributeViewImpl

    implements FileOwnerAttributeView, DynamicFileAttributeView

{

    private static final String OWNER_NAME = "owner";

    private final FileAttributeView view;

    private final boolean isPosixView;

    FileOwnerAttributeViewImpl(PosixFileAttributeView view) {

        this.view = view;

        this.isPosixView = true;

    }

    FileOwnerAttributeViewImpl(AclFileAttributeView view) {

        this.view = view;

        this.isPosixView = false;

    }

    @Override

    public String name() {

        return "owner";

    }

    @Override

    public void setAttribute(String attribute, Object value)

        throws IOException

    {

        if (attribute.equals(OWNER_NAME)) {

            setOwner((UserPrincipal)value);

        } else {

            throw new IllegalArgumentException("'" + name() + ":" +

                attribute + "' not recognized");

        }

    }

    @Override

    public Map<String,Object> readAttributes(String[] attributes) throws IOException {

        Map<String,Object> result = new HashMap<>();

        for (String attribute: attributes) {

            if (attribute.equals("*") || attribute.equals(OWNER_NAME)) {

                result.put(OWNER_NAME, getOwner());

            } else {

                throw new IllegalArgumentException("'" + name() + ":" +

                    attribute + "' not recognized");

            }

        }

        return result;

    }

    @Override

    public UserPrincipal getOwner() throws IOException {

        if (isPosixView) {

            return ((PosixFileAttributeView)view).readAttributes().owner();

        } else {

            return ((AclFileAttributeView)view).getOwner();

        }

    }

    @Override

    public void setOwner(UserPrincipal owner)

        throws IOException

    {

        if (isPosixView) {

            ((PosixFileAttributeView)view).setOwner(owner);

        } else {

            ((AclFileAttributeView)view).setOwner(owner);

        }

    }

 }