hdfs.jsr203.HadoopPosixFileAttributeView Maven / Gradle / Ivy

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A Java NIO file system provider for HDFS
There is a newer version: 1.0.3
/*
 * 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.LinkOption;
import java.nio.file.attribute.FileTime;
import java.nio.file.attribute.GroupPrincipal;
import java.nio.file.attribute.PosixFileAttributeView;
import java.nio.file.attribute.PosixFileAttributes;
import java.nio.file.attribute.PosixFilePermission;
import java.nio.file.attribute.UserPrincipal;
import java.nio.file.attribute.UserPrincipalLookupService;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;

import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;

public class HadoopPosixFileAttributeView extends HadoopFileOwnerAttributeView implements PosixFileAttributeView, IAttributeReader, IAttributeWriter {
	
	private final HadoopPath path;
	/** posix or owner ? */
	private final boolean isPosixView;
	
	private static enum AttrID {
        owner,
        creationTime,
        lastAccessTime,
        lastModifiedTime,
        isDirectory,
        isRegularFile,
        isSymbolicLink,
        isOther,
        fileKey
    };

	public HadoopPosixFileAttributeView(HadoopPath path, boolean isPosixView) {
	    super(path);
		this.path = path;
		this.isPosixView = isPosixView;
	}

	@Override
	public void setTimes(FileTime lastModifiedTime, FileTime lastAccessTime,
			FileTime createTime) throws IOException {
		// TODO Auto-generated method stub

	}

	@Override
	public String name() {
	    if (!isPosixView) {
	        return super.name();
	    }
		return "posix";
	}

	@Override
	public PosixFileAttributes readAttributes() throws IOException {
        Path resolvedPath = path.getRawResolvedPath();
        FileStatus fileStatus = path.getFileSystem().getHDFS().getFileStatus(resolvedPath);
        String fileKey = resolvedPath.toString();
		return new HadoopPosixFileAttributes(this.path.getFileSystem(), fileKey, fileStatus);
	}

	@Override
	public void setPermissions(Set perms)
			throws IOException {
		// TODO Auto-generated method stub

	}

	@Override
	public void setGroup(GroupPrincipal group) throws IOException {
		FileSystem fs = path.getFileSystem().getHDFS();
		fs.setOwner(path.getRawResolvedPath(), null, group.getName());
	}

	@Override
    public Map readAttributes(String attributes, LinkOption[] options) throws IOException
    {
        PosixFileAttributes zfas = readAttributes();
        LinkedHashMap map = new LinkedHashMap<>();
        if ("*".equals(attributes)) {
            for (AttrID id : AttrID.values()) {
                try {
                    map.put(id.name(), attribute(id, zfas));
                } catch (IllegalArgumentException x) {}
            }
        } else {
            String[] as = attributes.split(",");
            for (String a : as) {
                try {
                    map.put(a, attribute(AttrID.valueOf(a), zfas));
                } catch (IllegalArgumentException x) {}
            }
        }
        return map;
    }

	@Override
	public void setAttribute(String attr, Object value, LinkOption[] options)
			throws IOException {
		// TODO Auto-generated method stub
		throw new UnsupportedOperationException();
	}
	
	Object attribute(AttrID id, PosixFileAttributes hfas) {
        switch (id) {
        case owner:
            return hfas.owner().getName();
            
       /*case blockSize:
            if (isPosixView)
                return 0;//hfas.getFileStatus().getBlockSize();
            break;*/
        }
        return null;
    }
}