org.helidb.util.bplus
Class NumberOfRecordsNodeSizeStrategy

java.lang.Object
  org.helidb.util.bplus.NumberOfRecordsNodeSizeStrategy

All Implemented Interfaces:

NodeSizeStrategy

public class NumberOfRecordsNodeSizeStrategy
extends Object
implements NodeSizeStrategy

This NodeSizeStrategy uses a fixed number of records per node.

Since:

1.0

Author:

Karl Gustafsson

In_jar:

helidb-core

Constructor Summary

NumberOfRecordsNodeSizeStrategy(int noOfRecords)
Constructor.

Method Summary

int	getMaxNumberOfRecordsPerNode(int headerSize, int recordSize, long pos) Given the supplied size of the node header and records, how many records will fit in a node?
int	getNodeSize(int headerSize, int recordSize, long pos) Given the supplied size of the node header and records, how many bytes will a node occupy?

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NumberOfRecordsNodeSizeStrategy

public NumberOfRecordsNodeSizeStrategy(int noOfRecords)
                                throws IllegalArgumentException

Constructor.

Parameters:

noOfRecords - The number of records to store in a node.

Throws:

IllegalArgumentException - If the number of records is less than two.

Method Detail

getMaxNumberOfRecordsPerNode

public int getMaxNumberOfRecordsPerNode(int headerSize,
                                        int recordSize,
                                        long pos)

Description copied from interface: NodeSizeStrategy

Given the supplied size of the node header and records, how many records will fit in a node?

Specified by:

getMaxNumberOfRecordsPerNode in interface NodeSizeStrategy

Parameters:

headerSize - The size of the node header.

recordSize - The size of a record.

pos - The position of the node in the file.

Returns:

The number of records that fit in a node.

getNodeSize

public int getNodeSize(int headerSize,
                       int recordSize,
                       long pos)

Description copied from interface: NodeSizeStrategy

Given the supplied size of the node header and records, how many bytes will a node occupy?

Specified by:

getNodeSize in interface NodeSizeStrategy

Parameters:

headerSize - The size of the node header.

recordSize - The size of a record.

pos - The position of the node in the file.

Returns:

The size of a node, in bytes.