package org.apache.cassandra.io.util;
/*
*
* 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.
*
*/
import java.io.File;
import java.io.IOError;
import java.io.IOException;
public class BufferedSegmentedFile extends SegmentedFile
{
public BufferedSegmentedFile(String path, long length)
{
super(path, length);
}
public static class Builder extends SegmentedFile.Builder
{
/**
* Adds a position that would be a safe place for a segment boundary in the file. For a block/row based file
* format, safe boundaries are block/row edges.
* @param boundary The absolute position of the potential boundary in the file.
*/
public void addPotentialBoundary(long boundary)
{
// only one segment in a standard-io file
}
/**
* Called after all potential boundaries have been added to apply this Builder to a concrete file on disk.
* @param path The file on disk.
*/
public SegmentedFile complete(String path)
{
long length = new File(path).length();
return new BufferedSegmentedFile(path, length);
}
}
public FileDataInput getSegment(long position, int bufferSize)
{
try
{
BufferedRandomAccessFile file = new BufferedRandomAccessFile(path, "r", bufferSize);
file.seek(position);
return file;
}
catch (IOException e)
{
throw new IOError(e);
}
}
}