/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.drill.exec.store.dfs.shim.fallback;
import java.io.IOException;
import java.util.List;
import org.apache.drill.common.config.DrillConfig;
import org.apache.drill.exec.store.dfs.DrillPathFilter;
import org.apache.drill.exec.store.dfs.shim.DrillFileSystem;
import org.apache.drill.exec.store.dfs.shim.DrillInputStream;
import org.apache.drill.exec.store.dfs.shim.DrillOutputStream;
import org.apache.hadoop.fs.BlockLocation;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import com.google.common.collect.Lists;
public class FallbackFileSystem extends DrillFileSystem {
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(FallbackFileSystem.class);
final FileSystem fs;
public FallbackFileSystem(DrillConfig config, FileSystem fs) {
this.fs = fs;
}
@Override
public FileSystem getUnderlying() {
return fs;
}
@Override
public List<FileStatus> list(boolean recursive, Path... paths) throws IOException {
if (recursive) {
List<FileStatus> statuses = Lists.newArrayList();
for (Path p : paths) {
addRecursiveStatus(fs.getFileStatus(p), statuses);
}
return statuses;
} else {
return Lists.newArrayList(fs.listStatus(paths));
}
}
private void addRecursiveStatus(FileStatus parent, List<FileStatus> listToFill) throws IOException {
if (parent.isDir()) {
Path pattern = new Path(parent.getPath(), "*");
FileStatus[] sub = fs.globStatus(pattern, new DrillPathFilter());
for(FileStatus s : sub){
if (s.isDir()) {
addRecursiveStatus(s, listToFill);
} else {
listToFill.add(s);
}
}
} else {
listToFill.add(parent);
}
}
@Override
public FileStatus getFileStatus(Path p) throws IOException {
return fs.getFileStatus(p);
}
@Override
public DrillOutputStream create(Path p) throws IOException {
return new Out(fs.create(p));
}
@Override
public DrillInputStream open(Path p) throws IOException {
return new In(fs.open(p));
}
@Override
public void close() throws Exception {
fs.close();
}
@Override
public BlockLocation[] getBlockLocations(FileStatus status, long start, long len) throws IOException {
return fs.getFileBlockLocations(status, start, len);
}
private class Out extends DrillOutputStream {
private final FSDataOutputStream out;
public Out(FSDataOutputStream out) {
super();
this.out = out;
}
@Override
public void close() throws Exception {
out.close();
}
@Override
public FSDataOutputStream getOuputStream() {
return out;
}
}
private class In extends DrillInputStream {
private final FSDataInputStream in;
public In(FSDataInputStream in) {
super();
this.in = in;
}
@Override
public FSDataInputStream getInputStream() {
return in;
}
@Override
public void close() throws Exception {
in.close();
}
}
@Override
public boolean mkdirs(Path folderPath) throws IOException {
if (!fs.exists(folderPath)) {
return fs.mkdirs(folderPath);
} else if (!fs.getFileStatus(folderPath).isDirectory()) {
throw new IOException("The specified folder path exists and is not a folder.");
}
return false;
}
}