| /** |
| * 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.io.InputStream; |
| import java.net.URI; |
| import java.net.URISyntaxException; |
| import java.net.URL; |
| import java.net.URLConnection; |
| |
| import org.apache.hadoop.thirdparty.com.google.common.base.Preconditions; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.conf.Configuration; |
| |
| /** |
| * Representation of a URL connection to open InputStreams. |
| */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Unstable |
| class FsUrlConnection extends URLConnection { |
| private static final Logger LOG = |
| LoggerFactory.getLogger(FsUrlConnection.class); |
| |
| private Configuration conf; |
| |
| private InputStream is; |
| |
| FsUrlConnection(Configuration conf, URL url) { |
| super(url); |
| Preconditions.checkArgument(conf != null, "null conf argument"); |
| Preconditions.checkArgument(url != null, "null url argument"); |
| this.conf = conf; |
| } |
| |
| @Override |
| public void connect() throws IOException { |
| Preconditions.checkState(is == null, "Already connected"); |
| try { |
| LOG.debug("Connecting to {}", url); |
| URI uri = url.toURI(); |
| FileSystem fs = FileSystem.get(uri, conf); |
| // URI#getPath returns null value if path contains relative path |
| // i.e file:root/dir1/file1 |
| // So path can not be constructed from URI. |
| // We can only use schema specific part in URI. |
| // Uri#isOpaque return true if path is relative. |
| if(uri.isOpaque() && uri.getScheme().equals("file")) { |
| is = fs.open(new Path(uri.getSchemeSpecificPart())); |
| } else { |
| is = fs.open(new Path(uri)); |
| } |
| } catch (URISyntaxException e) { |
| throw new IOException(e.toString()); |
| } |
| } |
| |
| @Override |
| public InputStream getInputStream() throws IOException { |
| if (is == null) { |
| connect(); |
| } |
| return is; |
| } |
| |
| } |