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/*
 * Copyright (C)2009 - SSHJ Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.schmizz.sshj.sftp;

import net.schmizz.sshj.xfer.FilePermission;

import java.util.Collections;
import java.util.Set;

public class FileMode {

    public static enum Type {
        /** block special */
        BLOCK_SPECIAL(0060000),
        /** character special */
        CHAR_SPECIAL(0020000),
        /** FIFO special */
        FIFO_SPECIAL(0010000),
        /** socket special */
        SOCKET_SPECIAL(0140000),
        /** regular */
        REGULAR(0100000),
        /** directory */
        DIRECTORY(0040000),
        /** symbolic link */
        SYMLINK(0120000),
        /** unknown */
        UNKNOWN(0);

        private final int val;

        private Type(int val) {
            this.val = val;
        }

        public static Type fromMask(int mask) {
            for (Type t : Type.values())
                if (t.val == mask)
                    return t;
            return UNKNOWN;
        }

        public int toMask() {
            return val;
        }

    }

    private final int mask;
    private final Type type;
    private final Set perms;

    public FileMode(int mask) {
        this.mask = mask;
        this.type = Type.fromMask(getTypeMask());
        this.perms = FilePermission.fromMask(getPermissionsMask());
    }

    public int getMask() {
        return mask;
    }

    public int getTypeMask() {
        return mask & 0170000;
    }

    public int getPermissionsMask() {
        return mask & 07777;
    }

    public Type getType() {
        return type;
    }

    public Set getPermissions() {
        return Collections.unmodifiableSet(perms);
    }

    @Override
    public String toString() {
        return "[mask=" + Integer.toOctalString(mask) + "]";
    }

}