Package com.semedy.reasoner.edb.ramstore

Class HashIndex

java.lang.Object

com.semedy.reasoner.edb.ramstore.HashIndex

All Implemented Interfaces:

Index, MainMemoryIndex

Direct Known Subclasses:

PrimaryHashIndex, PrimaryIndex

public class HashIndex
extends Object
implements MainMemoryIndex

Hashindex for tuples

Author:

angele

Constructor Summary

Constructors

Constructor	Description
HashIndex(int[] indexPositions, TupleStore tuplestore, int arity, int initialSize, ReasoningMonitor monitor)
HashIndex(TupleStore tuplestore, int arity, int initialSize, ReasoningMonitor monitor)

Method Summary

Modifier and Type	Method	Description
boolean	addTuple(int tuple)	additional add method for main memory indices
boolean	addTuple(TupleBuffer tuple)
void	clear()
boolean	containsTuple(int tuple)	contains method for main memory indices
boolean	containsTuple(long[] tuple)	returns true if there exist matching values
boolean	containsTuple(TupleBuffer tuple)	returns true if there exist matching values
TupleEnumerator	elements()	iterator for all elements
int[]	getIndexedPositions()	Returns the indexed positions
long	getNumberOfMatchingTuples(long[] values)	returns the number of matching tuples
int	getTupleAddress(int tuple)	get the address of a tuple
int	getTupleAddress(long[] tuple)	get the address of a tuple
TupleStore	getTupleStore()	get the basic tuple store
boolean	hasSelectMatchingTuples(TupleBuffer values)
SelectableIndexEnumerator	indexedValues()
boolean	removeTuple(int tuple)	additional remove method for main memory indices
TupleEnumerator	selectMatchingTuples(long[] values)	returns an enumerator for matching tuples
TupleEnumerator	selectMatchingTuples(long[] values, TupleEnumerator it)	returns an enumerator for matching tuples reuse tuple enumerator
TupleEnumerator	selectMatchingTuples(TupleBuffer values)	returns an enumerator for matching tuples
long	size()	returns the number of indexed tuples
long	sizeInBytes()	return number of bytes used in main memory.

Methods inherited from class java.lang.Object

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

Constructor Details

HashIndex

public HashIndex(int[] indexPositions,
 TupleStore tuplestore,
 int arity,
 int initialSize,
 ReasoningMonitor monitor)

HashIndex

public HashIndex(TupleStore tuplestore,
 int arity,
 int initialSize,
 ReasoningMonitor monitor)

Method Details

sizeInBytes

public long sizeInBytes()

return number of bytes used in main memory. Used for cache management

Specified by:

sizeInBytes in interface Index

Returns:

getTupleStore

public TupleStore getTupleStore()

get the basic tuple store

Returns:

size

public long size()

Description copied from interface: Index

returns the number of indexed tuples

Specified by:

size in interface Index

Returns:

clear

public void clear()

removeTuple

public boolean removeTuple(int tuple)

Description copied from interface: MainMemoryIndex

additional remove method for main memory indices

Specified by:

removeTuple in interface MainMemoryIndex

Returns:

addTuple

public boolean addTuple(int tuple)
                 throws IOException

Description copied from interface: MainMemoryIndex

additional add method for main memory indices

Specified by:

addTuple in interface MainMemoryIndex

Returns:

Throws:

IOException

addTuple

public boolean addTuple(TupleBuffer tuple)
                 throws IOException

Throws:

IOException

containsTuple

public boolean containsTuple(long[] tuple)

Description copied from interface: Index

returns true if there exist matching values

Specified by:

containsTuple in interface Index

Parameters:

tuple - , values for indexed positions

Returns:

boolean, true if there exist matching values

containsTuple

public boolean containsTuple(int tuple)

Description copied from interface: MainMemoryIndex

contains method for main memory indices

Specified by:

containsTuple in interface MainMemoryIndex

Returns:

containsTuple

public boolean containsTuple(TupleBuffer tuple)

Description copied from interface: Index

returns true if there exist matching values

Specified by:

containsTuple in interface Index

Parameters:

tuple - , values for indexed positions

Returns:

boolean, true if there exist matching values

elements

public TupleEnumerator elements()

Description copied from interface: MainMemoryIndex

iterator for all elements

Specified by:

elements in interface MainMemoryIndex

Returns:

selectMatchingTuples

public TupleEnumerator selectMatchingTuples(long[] values,
 TupleEnumerator it)
                                     throws IOException

Description copied from interface: Index

returns an enumerator for matching tuples reuse tuple enumerator

Specified by:

selectMatchingTuples in interface Index

Returns:

Throws:

IOException

selectMatchingTuples

public TupleEnumerator selectMatchingTuples(long[] values)
                                     throws IOException

Description copied from interface: Index

returns an enumerator for matching tuples

Specified by:

selectMatchingTuples in interface Index

Parameters:

values - , values for indexed positions

Returns:

enumerator for matching tuples

Throws:

IOException

selectMatchingTuples

public TupleEnumerator selectMatchingTuples(TupleBuffer values)
                                     throws IOException

Description copied from interface: Index

returns an enumerator for matching tuples

Specified by:

selectMatchingTuples in interface Index

Parameters:

values - , values for indexed positions

Returns:

enumerator for matching tuples

Throws:

IOException

hasSelectMatchingTuples

public boolean hasSelectMatchingTuples(TupleBuffer values)
                                throws IOException,
EDBException

Throws:

IOException

EDBException

getNumberOfMatchingTuples

public long getNumberOfMatchingTuples(long[] values)
                               throws IOException,
EDBException

Description copied from interface: Index

returns the number of matching tuples

Specified by:

getNumberOfMatchingTuples in interface Index

Parameters:

values - , values for indexed positions

Returns:

number of matching tuples

Throws:

EDBException

IOException

getIndexedPositions

public int[] getIndexedPositions()

Description copied from interface: Index

Returns the indexed positions

Specified by:

getIndexedPositions in interface Index

Returns:

the indexed positions

indexedValues

public SelectableIndexEnumerator indexedValues()

getTupleAddress

public int getTupleAddress(int tuple)

get the address of a tuple

Specified by:

getTupleAddress in interface MainMemoryIndex

Parameters:

tuple -

Returns:

getTupleAddress

public int getTupleAddress(long[] tuple)

get the address of a tuple

Specified by:

getTupleAddress in interface MainMemoryIndex

Parameters:

tuple -

Returns: