/*

 * 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.attribute.*;

import java.util.*;

class UnixFileModeAttribute {

    static final int ALL_PERMISSIONS =

        UnixConstants.S_IRUSR | UnixConstants.S_IWUSR | UnixConstants.S_IXUSR |

        UnixConstants.S_IRGRP | UnixConstants.S_IWGRP | UnixConstants.S_IXGRP |

        UnixConstants.S_IROTH | UnixConstants.S_IWOTH | UnixConstants. S_IXOTH;

    static final int ALL_READWRITE =

        UnixConstants.S_IRUSR | UnixConstants.S_IWUSR |

        UnixConstants.S_IRGRP | UnixConstants.S_IWGRP |

        UnixConstants.S_IROTH | UnixConstants.S_IWOTH;

    static final int TEMPFILE_PERMISSIONS =

        UnixConstants.S_IRUSR | UnixConstants.S_IWUSR | UnixConstants.S_IXUSR;

    private Set<PosixFilePermission> perms;

    UnixFileModeAttribute() {

        perms = Collections.emptySet();

    }

    static int toUnixMode(Set<PosixFilePermission> perms) {

        int mode = 0;

        for (PosixFilePermission perm: perms) {

            if (perm == null)

                throw new NullPointerException();

            switch (perm) {

                case OWNER_READ :     mode |= UnixConstants.S_IRUSR; break;

                case OWNER_WRITE :    mode |= UnixConstants.S_IWUSR; break;

                case OWNER_EXECUTE :  mode |= UnixConstants.S_IXUSR; break;

                case GROUP_READ :     mode |= UnixConstants.S_IRGRP; break;

                case GROUP_WRITE :    mode |= UnixConstants.S_IWGRP; break;

                case GROUP_EXECUTE :  mode |= UnixConstants.S_IXGRP; break;

                case OTHERS_READ :    mode |= UnixConstants.S_IROTH; break;

                case OTHERS_WRITE :   mode |= UnixConstants.S_IWOTH; break;

                case OTHERS_EXECUTE : mode |= UnixConstants.S_IXOTH; break;

            }

        }

        return mode;

    }

    @SuppressWarnings("unchecked")

    static int toUnixMode(int defaultMode, FileAttribute<?>... attrs) {

        int mode = defaultMode;

        for (FileAttribute<?> attr: attrs) {

            String name = attr.name();

            if (!name.equals("posix:permissions") && !name.equals("unix:permissions")) {

                throw new UnsupportedOperationException("'" + attr.name() +

                   "' not supported as initial attribute");

            }

            mode = toUnixMode((Set<PosixFilePermission>)attr.value());

        }

        return mode;

    }

}