| /** |
| * 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.*; |
| |
| /** Utility that wraps a {@link OutputStream} in a {@link DataOutputStream}, |
| * buffers output through a {@link BufferedOutputStream} and creates a checksum |
| * file. */ |
| public class FSDataOutputStream extends DataOutputStream { |
| private static class PositionCache extends FilterOutputStream { |
| long position; |
| |
| public PositionCache(OutputStream out) throws IOException { |
| super(out); |
| } |
| |
| public void write(int b) throws IOException { |
| out.write(b); |
| position++; |
| } |
| |
| public void write(byte b[], int off, int len) throws IOException { |
| out.write(b, off, len); |
| position += len; // update position |
| } |
| |
| public long getPos() throws IOException { |
| return position; // return cached position |
| } |
| |
| public void close() throws IOException { |
| flush(); |
| out.close(); |
| } |
| } |
| |
| public FSDataOutputStream(OutputStream out) |
| throws IOException { |
| super(new PositionCache(out)); |
| } |
| |
| public long getPos() throws IOException { |
| return ((PositionCache)out).getPos(); |
| } |
| |
| public void close() throws IOException { |
| flush(); |
| out.close(); |
| } |
| } |