| /** |
| * 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.Closeable; |
| import java.io.IOException; |
| |
| import org.apache.avro.file.SeekableInput; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| |
| /** Adapts an {@link FSDataInputStream} to Avro's SeekableInput interface. */ |
| @InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class AvroFSInput implements Closeable, SeekableInput { |
| private final FSDataInputStream stream; |
| private final long len; |
| |
| /** Construct given an {@link FSDataInputStream} and its length. */ |
| public AvroFSInput(final FSDataInputStream in, final long len) { |
| this.stream = in; |
| this.len = len; |
| } |
| |
| /** Construct given a {@link FileContext} and a {@link Path}. */ |
| public AvroFSInput(final FileContext fc, final Path p) throws IOException { |
| FileStatus status = fc.getFileStatus(p); |
| this.len = status.getLen(); |
| this.stream = fc.open(p); |
| } |
| |
| public long length() { |
| return len; |
| } |
| |
| public int read(byte[] b, int off, int len) throws IOException { |
| return stream.read(b, off, len); |
| } |
| |
| public void seek(long p) throws IOException { |
| stream.seek(p); |
| } |
| |
| public long tell() throws IOException { |
| return stream.getPos(); |
| } |
| |
| public void close() throws IOException { |
| stream.close(); |
| } |
| } |