| /* |
| * 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.parquet.hadoop.util; |
| |
| import org.apache.hadoop.fs.FSDataInputStream; |
| import org.apache.parquet.io.DelegatingSeekableInputStream; |
| |
| import java.io.EOFException; |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| |
| /** |
| * SeekableInputStream implementation for FSDataInputStream that implements |
| * ByteBufferReadable in Hadoop 2. |
| */ |
| class H2SeekableInputStream extends DelegatingSeekableInputStream { |
| |
| // Visible for testing |
| interface Reader { |
| int read(ByteBuffer buf) throws IOException; |
| } |
| |
| private final FSDataInputStream stream; |
| private final Reader reader; |
| |
| public H2SeekableInputStream(FSDataInputStream stream) { |
| super(stream); |
| this.stream = stream; |
| this.reader = new H2Reader(); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| stream.close(); |
| } |
| |
| @Override |
| public long getPos() throws IOException { |
| return stream.getPos(); |
| } |
| |
| @Override |
| public void seek(long newPos) throws IOException { |
| stream.seek(newPos); |
| } |
| |
| @Override |
| public void readFully(byte[] bytes, int start, int len) throws IOException { |
| stream.readFully(bytes, start, len); |
| } |
| |
| @Override |
| public int read(ByteBuffer buf) throws IOException { |
| return stream.read(buf); |
| } |
| |
| @Override |
| public void readFully(ByteBuffer buf) throws IOException { |
| readFully(reader, buf); |
| } |
| |
| private class H2Reader implements Reader { |
| @Override |
| public int read(ByteBuffer buf) throws IOException { |
| return stream.read(buf); |
| } |
| } |
| |
| public static void readFully(Reader reader, ByteBuffer buf) throws IOException { |
| // unfortunately the Hadoop 2 APIs do not have a 'readFully' equivalent for the byteBuffer read |
| // calls. The read(ByteBuffer) call might read fewer than byteBuffer.hasRemaining() bytes. Thus we |
| // have to loop to ensure we read them. |
| while (buf.hasRemaining()) { |
| int readCount = reader.read(buf); |
| if (readCount == -1) { |
| // this is probably a bug in the ParquetReader. We shouldn't have called readFully with a buffer |
| // that has more remaining than the amount of data in the stream. |
| throw new EOFException("Reached the end of stream. Still have: " + buf.remaining() + " bytes left"); |
| } |
| } |
| } |
| } |