Module org.apache.jena.dboe.trans.data

Package org.apache.jena.dboe.trans.bplustree

Class BPlusTreeParams

java.lang.Object

org.apache.jena.dboe.trans.bplustree.BPlusTreeParams

public final class BPlusTreeParams
extends Object

Configuration for a B+Tree

Field Summary

Fields

Modifier and Type	Field	Description
static final int	NoParent
static final String	NS
static final String	ParamBlockSize
static final String	ParamKeyLength
static final String	ParamOrder
static final String	ParamValueLength
static final int	RootId
static final int	RootParent
static final int	UnsetParent

Constructor Summary

Constructors

Constructor	Description
BPlusTreeParams(int order, int keyLen, int valLen)
BPlusTreeParams(int order, org.apache.jena.dboe.base.record.RecordFactory factory)

Method Summary

Modifier and Type	Method	Description
void	addToMetaData(org.apache.jena.dboe.base.file.MetaFile mf)
static int	calcBlockSize(int bpTreeOrder, org.apache.jena.dboe.base.record.RecordFactory factory)	return the size of a block
static int	calcOrder(int blockSize, int recordLength)	Return the best fit for the blocksize and the record length.
static int	calcOrder(int blockSize, org.apache.jena.dboe.base.record.RecordFactory factory)	Return the best fit for the blocksize and the record length.
int	getCalcBlockSize()
org.apache.jena.dboe.base.record.RecordFactory	getKeyFactory()
int	getKeyLength()
int	getMaxPtr()
int	getMaxRec()
int	getMinPtr()
int	getMinRec()
int	getOrder()
int	getPtrLength()
org.apache.jena.dboe.base.record.RecordFactory	getRecordFactory()
int	getRecordLength()
static BPlusTreeParams	readMeta(org.apache.jena.dboe.base.file.MetaFile mf)
String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Details

NS

public static final String NS

ParamOrder

public static final String ParamOrder

ParamKeyLength

public static final String ParamKeyLength

ParamValueLength

public static final String ParamValueLength

ParamBlockSize

public static final String ParamBlockSize

RootId

public static final int RootId

See Also:

• Constant Field Values

RootParent

public static final int RootParent

See Also:

• Constant Field Values

NoParent

public static final int NoParent

See Also:

• Constant Field Values

UnsetParent

public static final int UnsetParent

See Also:

• Constant Field Values

Constructor Details

BPlusTreeParams

public BPlusTreeParams(int order,
 int keyLen,
 int valLen)

BPlusTreeParams

public BPlusTreeParams(int order,
 org.apache.jena.dboe.base.record.RecordFactory factory)

Method Details

toString

public String toString()

Overrides:

toString in class Object

readMeta

public static BPlusTreeParams readMeta(org.apache.jena.dboe.base.file.MetaFile mf)

addToMetaData

public void addToMetaData(org.apache.jena.dboe.base.file.MetaFile mf)

getOrder

public int getOrder()

getPtrLength

public int getPtrLength()

getRecordLength

public int getRecordLength()

getRecordFactory

public org.apache.jena.dboe.base.record.RecordFactory getRecordFactory()

getKeyLength

public int getKeyLength()

getKeyFactory

public org.apache.jena.dboe.base.record.RecordFactory getKeyFactory()

getCalcBlockSize

public int getCalcBlockSize()

calcOrder

public static int calcOrder(int blockSize,
 org.apache.jena.dboe.base.record.RecordFactory factory)

Return the best fit for the blocksize and the record length. Knows about block header space.

calcOrder

public static int calcOrder(int blockSize,
 int recordLength)

Return the best fit for the blocksize and the record length. Knows about block header space.

calcBlockSize

public static int calcBlockSize(int bpTreeOrder,
 org.apache.jena.dboe.base.record.RecordFactory factory)

return the size of a block

getMaxRec

public int getMaxRec()

getMaxPtr

public int getMaxPtr()

getMinRec

public int getMinRec()

getMinPtr

public int getMinPtr()