org.apache.hadoop.fs.ProxyLocalFileSystem Maven / Gradle / Ivy
/**
* 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.hadoop.fs;
import java.io.IOException;
import java.net.URI;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.util.Shell;
import org.apache.hadoop.hive.shims.ShimLoader;
import org.apache.hadoop.hive.shims.HadoopShims;
/****************************************************************
* A Proxy for LocalFileSystem
*
* Serves uri's corresponding to 'pfile:///' namespace with using
* a LocalFileSystem
*****************************************************************/
public class ProxyLocalFileSystem extends FilterFileSystem {
protected LocalFileSystem localFs;
public ProxyLocalFileSystem() {
localFs = new LocalFileSystem();
}
public ProxyLocalFileSystem(FileSystem fs) {
throw new RuntimeException ("Unsupported Constructor");
}
@Override
public void initialize(URI name, Configuration conf) throws IOException {
// create a proxy for the local filesystem
// the scheme/authority serving as the proxy is derived
// from the supplied URI
String scheme = name.getScheme();
String nameUriString = name.toString();
if (Shell.WINDOWS) {
// Replace the encoded backward slash with forward slash
// Remove the windows drive letter
nameUriString = nameUriString.replaceAll("%5C", "/")
.replaceFirst("/[c-zC-Z]:", "/")
.replaceFirst("^[c-zC-Z]:", "");
name = URI.create(nameUriString);
}
String authority = name.getAuthority() != null ? name.getAuthority() : "";
String proxyUriString = nameUriString + "://" + authority + "/";
fs = ShimLoader.getHadoopShims().createProxyFileSystem(
localFs, URI.create(proxyUriString));
fs.initialize(name, conf);
}
}