Package com.semedy.reasoner.edb.ramstore

Class MainMemorySubRelation

java.lang.Object

com.semedy.reasoner.edb.ramstore.MainMemoryRelation

com.semedy.reasoner.edb.ramstore.MixedRelation

com.semedy.reasoner.edb.ramstore.MainMemorySubRelation

All Implemented Interfaces:

BaseRelation, Relation, CacheUnit

public class MainMemorySubRelation
extends MixedRelation

A sub relation of a persistent relation defined by a filter.
Sub relation is kept in main memory.

Author:

juergen

Field Summary

Fields inherited from class com.semedy.reasoner.edb.ramstore.MainMemoryRelation

_baseRelation

Constructor Summary

Constructors

Constructor	Description
MainMemorySubRelation(List<Relation> relations, long[] filter, int arity, long[] grounds)

Method Summary

Modifier and Type	Method	Description
boolean	addTuple(int tuple)	add a tuple to the relation
boolean	addTuple(long[] tuple)	add a tuple to the relation
boolean	addTuple(TupleBuffer tuple)	add a tuple to the relation
long[]	getFilter()
long	getNumberOfDifferentValues(int argument)	Returns the number of different values at the argument positions.
long	getNumberOfDifferentValues(int argument, long value)	Returns the number of values occurring at the argument positions Used for statistics
boolean	isEmpty()	Is the relation empty?
boolean	removeTuple(int tuple)	remove a tuple from the relation
boolean	removeTuple(long[] tuple)	remove a tuple from the relation
boolean	removeTuple(TupleBuffer tuple)	remove a tuple from the relation
void	select()	intialize the use: the tuples are copied from the persistent part to the main memory part
long	size()	returns the number of tuples in relation

Methods inherited from class com.semedy.reasoner.edb.ramstore.MixedRelation

checkSanity, clear, close, count, delete, destroy, flush, getDataFilePath, getLast, getMaxValue, getMinValue, getNext, getPersistentRelation, isReleasable, readTupleFile, release, remove, setLast, setNext, setPersistentRelation, sizeInBytes, toString, touch, transactionBegin, transactionCommit, transactionRollback

Methods inherited from class com.semedy.reasoner.edb.ramstore.MainMemoryRelation

addSubRelation, containsTuple, containsTuple, containsTuple, createIndex, createSortedIndex, deSelect, elements, elements, getArity, getCacheInfo, getDirectEncodedType, getFilename, getGrounds, getIdentifier, getIndex, getInputBuffer, getInternalArity, getName, getPredicateSymbol, getSortedIndex, getTupleStore, getValues, hasDuplicates, isDirectEncoded, isOverwrittenByTuple, isPersistent, isTemporary, lastModificationTime, mayContainDuplicates, overwriteTuple, overwriteTuple, readBinaryFromBackup, registerListener, union, writeBinary, writeBinaryToBackup, writeBinaryWithGrounds

Methods inherited from class java.lang.Object

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

Constructor Details

MainMemorySubRelation

public MainMemorySubRelation(List<Relation> relations,
 long[] filter,
 int arity,
 long[] grounds)
                      throws IOException,
EDBException

Parameters:

relations -

filter -

arity -

grounds -

Throws:

IOException

EDBException

Method Details

size

public long size()
          throws IOException,
EDBException

Description copied from interface: BaseRelation

returns the number of tuples in relation

Specified by:

size in interface BaseRelation

Overrides:

size in class MixedRelation

Returns:

number of tuples in relation

Throws:

IOException

EDBException

getFilter

public long[] getFilter()

addTuple

public boolean addTuple(long[] tuple)
                 throws IOException

Description copied from interface: BaseRelation

add a tuple to the relation

Specified by:

addTuple in interface BaseRelation

Overrides:

addTuple in class MixedRelation

Parameters:

tuple - the tuple to add

Returns:

tuple has been added

Throws:

IOException

addTuple

public boolean addTuple(TupleBuffer tuple)
                 throws IOException

Description copied from interface: BaseRelation

add a tuple to the relation

Specified by:

addTuple in interface BaseRelation

Overrides:

addTuple in class MixedRelation

Parameters:

tuple - the tuple to add

Returns:

tuple has been added

Throws:

IOException

addTuple

public boolean addTuple(int tuple)
                 throws IOException

Description copied from interface: BaseRelation

add a tuple to the relation

Specified by:

addTuple in interface BaseRelation

Overrides:

addTuple in class MainMemoryRelation

Parameters:

tuple - the tuple to add

Returns:

tuple has been added

Throws:

IOException

removeTuple

public boolean removeTuple(long[] tuple)
                    throws IOException

Description copied from interface: BaseRelation

remove a tuple from the relation

Specified by:

removeTuple in interface BaseRelation

Overrides:

removeTuple in class MixedRelation

Parameters:

tuple - , tuple to be removed

Returns:

true, if tuple has been removed

Throws:

IOException

removeTuple

public boolean removeTuple(TupleBuffer tuple)
                    throws IOException

Description copied from interface: BaseRelation

remove a tuple from the relation

Specified by:

removeTuple in interface BaseRelation

Overrides:

removeTuple in class MixedRelation

Parameters:

tuple - , tuple to be removed

Returns:

true, if tuple has been removed

Throws:

IOException

removeTuple

public boolean removeTuple(int tuple)
                    throws IOException

Description copied from interface: BaseRelation

remove a tuple from the relation

Specified by:

removeTuple in interface BaseRelation

Overrides:

removeTuple in class MainMemoryRelation

Parameters:

tuple - , address of tuple in tuple store

Returns:

true, if tuple has been removed

Throws:

IOException

select

public void select()
            throws IOException,
EDBException

Description copied from class: MixedRelation

intialize the use: the tuples are copied from the persistent part to the main memory part

Specified by:

select in interface BaseRelation

Specified by:

select in interface Relation

Overrides:

select in class MixedRelation

Throws:

IOException

EDBException

getNumberOfDifferentValues

public long getNumberOfDifferentValues(int argument)
                                throws IOException,
EDBException

Description copied from interface: Relation

Returns the number of different values at the argument positions.
Used for statistics.

Specified by:

getNumberOfDifferentValues in interface Relation

Overrides:

getNumberOfDifferentValues in class MixedRelation

Parameters:

argument - , argument position

Returns:

Throws:

EDBException

IOException

getNumberOfDifferentValues

public long getNumberOfDifferentValues(int argument,
 long value)
                                throws IOException,
EDBException

Description copied from interface: Relation

Returns the number of values occurring at the argument positions
Used for statistics

Specified by:

getNumberOfDifferentValues in interface Relation

Overrides:

getNumberOfDifferentValues in class MixedRelation

Parameters:

argument - , argument position

value - , the concrete value

Returns:

Throws:

EDBException

IOException

isEmpty

public boolean isEmpty()
                throws IOException

Description copied from interface: BaseRelation

Is the relation empty?

Specified by:

isEmpty in interface BaseRelation

Overrides:

isEmpty in class MixedRelation

Returns:

relation is empty

Throws:

IOException