hdfs.jsr203.HadoopFileStore.java Source code

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Here is the source code for hdfs.jsr203.HadoopFileStore.java

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/*
 * Copyright 2016 Damien Carol <damien.carol@gmail.com>
 *
 * 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.FileStore;
import java.nio.file.attribute.BasicFileAttributeView;
import java.nio.file.attribute.FileAttributeView;
import java.nio.file.attribute.FileStoreAttributeView;
import java.nio.file.attribute.PosixFileAttributeView;

import org.apache.hadoop.fs.FsStatus;

/**
 * Implements {@link FileStore}.
 */
public class HadoopFileStore extends FileStore {

    private HadoopFileSystem system;

    public HadoopFileStore(HadoopPath path) {
        this.system = path.getFileSystem();
    }

    @Override
    public String name() {
        return this.system.getHDFS().getCanonicalServiceName();
    }

    @Override
    public String type() {
        return "hdfs";
    }

    @Override
    public boolean isReadOnly() {
        return this.system.isReadOnly();
    }

    @Override
    public long getTotalSpace() throws IOException {
        return this.system.getHDFS().getStatus().getCapacity();
    }

    @Override
    public long getUsableSpace() throws IOException {
        return this.system.getHDFS().getStatus().getRemaining();
    }

    @Override
    public long getUnallocatedSpace() throws IOException {
        FsStatus status = this.system.getHDFS().getStatus();
        return status.getCapacity() - status.getUsed();
    }

    @Override
    public boolean supportsFileAttributeView(Class<? extends FileAttributeView> type) {
        if (type == BasicFileAttributeView.class) {
            return this.system.supportedFileAttributeViews().contains("basic");
        }
        if (type == PosixFileAttributeView.class) {
            return this.system.supportedFileAttributeViews().contains("posix");
        }
        // FIXME Implements all FileAttributeView checks
        return false;
    }

    @Override
    public boolean supportsFileAttributeView(String name) {
        return this.system.supportedFileAttributeViews().contains(name);
    }

    @Override
    public <V extends FileStoreAttributeView> V getFileStoreAttributeView(Class<V> type) {
        return null;
    }

    @Override
    public Object getAttribute(String attribute) throws IOException {
        return null;
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder("/ (");
        sb.append(system.getHDFS().getCanonicalServiceName());
        sb.append(')');
        return sb.toString();
    }

}