hdfs.jsr203.HadoopPosixFileAttributes Maven / Gradle / Ivy

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/*
 * Copyright 2016 Damien Carol 
 *
 * 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 hdfs.jsr203;

import java.io.IOException;
import java.nio.file.attribute.GroupPrincipal;
import java.nio.file.attribute.PosixFileAttributes;
import java.nio.file.attribute.PosixFilePermission;
import java.nio.file.attribute.PosixFilePermissions;
import java.nio.file.attribute.UserPrincipal;
import java.util.Set;

import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.permission.FsPermission;

public class HadoopPosixFileAttributes extends HadoopFileAttributes implements PosixFileAttributes {

	private HadoopFileSystem hdfs;

	public HadoopPosixFileAttributes(HadoopFileSystem hdfs, Object fileKey, FileStatus fileStatus) throws IOException {
	    super(fileKey, fileStatus);
		this.hdfs = hdfs;
	}

	@Override
	public UserPrincipal owner() {
		try {
			return this.hdfs.getUserPrincipalLookupService().lookupPrincipalByName(getFileStatus().getOwner());
		} catch (IOException e) {
			e.printStackTrace();
			return null;
		}
	}

	@Override
	public GroupPrincipal group() {
		try {
			return this.hdfs.getUserPrincipalLookupService().lookupPrincipalByGroupName(getFileStatus().getGroup());
		} catch (IOException e) {
			e.printStackTrace();
			return null;
		}
	}

	@Override
	public Set permissions() {
		FsPermission fsPermission = getFileStatus().getPermission();
		String perms = fsPermission.getUserAction().SYMBOL +
				fsPermission.getGroupAction().SYMBOL +
				fsPermission.getOtherAction().SYMBOL;
		return PosixFilePermissions.fromString(perms);
	}
}