org.jrdf.graph.index.longindex.derby
Class LongIndexDerby

java.lang.Object
  org.jrdf.graph.index.longindex.derby.LongIndexDerby

All Implemented Interfaces:

LongIndex

public final class LongIndexDerby
extends Object
implements LongIndex

An on disk version of $LongIndex using Apache Derby.

Version:

$Revision: 977 $

Author:

Andrew Newman

Constructor Summary

LongIndexDerby(org.apache.derby.iapi.store.access.DiskHashtable diskHashtable, org.apache.derby.iapi.store.access.TransactionController controller)

Method Summary

void	add(Long[] triple) Adds a triple to a single index.
void	add(Long first, Long second, Long third) Adds a triple to a single index.
long	getSize() Returns the number of triples in the index.
Map<Long,Set<Long>>	getSubIndex(Long first) Returns the map of long to set of longs for the given entry of the index.
Iterator<Map.Entry<Long,Map<Long,Set<Long>>>>	iterator() Returns an iterator which contains all the elements in the graph as a collections of distinct longs, contains a map of longs to other longs.
void	remove(Long[] triple) Removes a triple from a single index.
void	remove(Long first, Long second, Long third) Removes a triple from a single index.
boolean	removeSubIndex(Long first) Removes the given entry of long to set of longs with the given entry.

Methods inherited from class java.lang.Object

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

Constructor Detail

LongIndexDerby

public LongIndexDerby(org.apache.derby.iapi.store.access.DiskHashtable diskHashtable,
                      org.apache.derby.iapi.store.access.TransactionController controller)

Method Detail

add

public void add(Long[] triple)

Description copied from interface: LongIndex

Adds a triple to a single index. This method defines the internal structure.

Specified by:

add in interface LongIndex

Parameters:

triple - Consists of three longs.

add

public void add(Long first,
                Long second,
                Long third)

Description copied from interface: LongIndex

Adds a triple to a single index. This method defines the internal structure.

Specified by:

add in interface LongIndex

Parameters:

first - The first node id.

second - The second node id.

third - The last node id.

remove

public void remove(Long[] triple)
            throws GraphException

Description copied from interface: LongIndex

Removes a triple from a single index.

Specified by:

remove in interface LongIndex

Parameters:

triple - Consists of three longs.

Throws:

GraphException - If there was an error revoking the statement, for example if it didn't exist.

remove

public void remove(Long first,
                   Long second,
                   Long third)
            throws GraphException

Description copied from interface: LongIndex

Removes a triple from a single index.

Specified by:

remove in interface LongIndex

Parameters:

first - The first node id.

second - The second node id.

third - The last node id.

Throws:

GraphException - If there was an error revoking the statement, for example if it didn't exist.

iterator

public Iterator<Map.Entry<Long,Map<Long,Set<Long>>>> iterator()

Description copied from interface: LongIndex

Returns an iterator which contains all the elements in the graph as a collections of distinct longs, contains a map of longs to other longs. This prevents any duplication.

Specified by:

iterator in interface LongIndex

Returns:

an iterator which contains all the elements in the graph as a collections of distinct longs, contains a map of longs to other longs. This prevents any duplication.

getSubIndex

public Map<Long,Set<Long>> getSubIndex(Long first)

Description copied from interface: LongIndex

Returns the map of long to set of longs for the given entry of the index. For example, a given subject id is given and it returns a map of predicates to objects.

Specified by:

getSubIndex in interface LongIndex

Parameters:

first - the entry set to find.

Returns:

a map containing the list of longs to set of longs.

removeSubIndex

public boolean removeSubIndex(Long first)

Description copied from interface: LongIndex

Removes the given entry of long to set of longs with the given entry. For example, a given subject id is given and it will remove all the associated predicate and objects for that subject.

Specified by:

removeSubIndex in interface LongIndex

Parameters:

first - the entry set to remove.

Returns:

true if the entry set was non-null.

getSize

public long getSize()

Description copied from interface: LongIndex

Returns the number of triples in the index.

Specified by:

getSize in interface LongIndex

Returns:

the number of triples in the index.