Package elki.index.tree.spatial.rstarvariants.rdknn

Class RdKNNTreeHeader

java.lang.Object

elki.persistent.DefaultPageHeader

elki.index.tree.TreeIndexHeader

elki.index.tree.spatial.rstarvariants.rdknn.RdKNNTreeHeader

All Implemented Interfaces:

PageHeader

class RdKNNTreeHeader
extends TreeIndexHeader

Encapsulates the header information of a RDkNN-Tree. This information is needed for persistent storage.

Since:

0.1

Author:

Elke Achtert

Field Summary

Fields

Modifier and Type	Field	Description
(package private) int	k_max	The maximum number k of reverse kNN queries to be supported.
private static int	SIZE	The size of this header in Bytes, which is 4 Bytes (for k_max).

Constructor Summary

Constructors

Constructor	Description
RdKNNTreeHeader()	Empty constructor for serialization.
RdKNNTreeHeader(int pageSize, int dirCapacity, int leafCapacity, int dirMinimum, int leafMinimum, int k_max)	Creates a new header with the specified parameters.

Method Summary

Modifier and Type	Method	Description
void	readHeader(java.nio.ByteBuffer buffer)	Initializes this header from the specified file.
int	size()	Returns TreeIndexHeader.size() plus the value of SIZE).
void	writeHeader(java.nio.ByteBuffer buffer)	Writes this header to the specified file.

Methods inherited from class elki.index.tree.TreeIndexHeader

getDirCapacity, getDirMinimum, getEmptyPagesSize, getLargestPageID, getLeafCapacity, getLeafMinimum, readEmptyPages, setEmptyPagesSize, setLargestPageID, writeEmptyPages

Methods inherited from class elki.persistent.DefaultPageHeader

getPageSize, getReservedPages

Methods inherited from class java.lang.Object

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

Methods inherited from interface elki.persistent.PageHeader

readHeader, writeHeader

Field Detail

SIZE

private static int SIZE

The size of this header in Bytes, which is 4 Bytes (for k_max).

k_max

int k_max

The maximum number k of reverse kNN queries to be supported.

Constructor Detail

RdKNNTreeHeader

public RdKNNTreeHeader()

Empty constructor for serialization.

RdKNNTreeHeader

public RdKNNTreeHeader(int pageSize,
                       int dirCapacity,
                       int leafCapacity,
                       int dirMinimum,
                       int leafMinimum,
                       int k_max)

Creates a new header with the specified parameters.

Parameters:

pageSize - the size of a page in bytes

dirCapacity - the maximum number of entries in a directory node

leafCapacity - the maximum number of entries in a leaf node

dirMinimum - the minimum number of entries in a directory node

leafMinimum - the minimum number of entries in a leaf node

k_max - the maximum number k of reverse kNN queries to be supported

Method Detail

readHeader

public void readHeader(java.nio.ByteBuffer buffer)

Initializes this header from the specified file. Calls TreeIndexHeader#readHeader(file) and reads additionally the integer value of k_max from the file.

Specified by:

readHeader in interface PageHeader

Overrides:

readHeader in class TreeIndexHeader

Parameters:

buffer - byte array with the page data.

writeHeader

public void writeHeader(java.nio.ByteBuffer buffer)

Writes this header to the specified file. Calls PageHeader.writeHeader(FileChannel) and writes additionally the integer value of k_max to the file.

Specified by:

writeHeader in interface PageHeader

Overrides:

writeHeader in class TreeIndexHeader

Parameters:

buffer - Buffer to write to

size

public int size()

Returns TreeIndexHeader.size() plus the value of SIZE).

Specified by:

size in interface PageHeader

Overrides:

size in class TreeIndexHeader

Returns:

the size of this header in Bytes