| /* |
| * 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.ignite.internal.processors.igfs.secondary.local; |
| |
| import java.io.BufferedInputStream; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| import org.apache.ignite.igfs.secondary.IgfsSecondaryFileSystemPositionedReadable; |
| |
| /** |
| * Positioned readable interface for local secondary file system. |
| */ |
| public class LocalFileSystemPositionedReadable extends BufferedInputStream |
| implements IgfsSecondaryFileSystemPositionedReadable { |
| /** Last read position. */ |
| private long lastReadPos; |
| |
| /** |
| * Constructor. |
| * |
| * @param in Input stream. |
| * @param bufSize Buffer size. |
| */ |
| public LocalFileSystemPositionedReadable(FileInputStream in, int bufSize) { |
| super(in, bufSize); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public int read(long readPos, byte[] buf, int off, int len) throws IOException { |
| if (in == null) |
| throw new IOException("Stream is closed."); |
| |
| if (readPos < lastReadPos || readPos + len > lastReadPos + this.buf.length) { |
| ((FileInputStream)in).getChannel().position(readPos); |
| |
| pos = 0; |
| count = 0; |
| } |
| |
| int bytesRead = read(buf, off, len); |
| |
| if (bytesRead != -1) { |
| // Advance last read position only if we really read some bytes from the stream. |
| lastReadPos = readPos + bytesRead; |
| } |
| |
| return bytesRead; |
| } |
| } |