org.deri.iris.storage.simple
Class SimpleIndexFactory

java.lang.Object
  org.deri.iris.storage.simple.SimpleIndexFactory

All Implemented Interfaces:

IIndexFactory

public class SimpleIndexFactory
extends Object
implements IIndexFactory

Factory for simple indexes.

Constructor Summary

SimpleIndexFactory()

Method Summary

IIndex	createIndex(IRelation relation, IEquivalentTerms equivalentTerms, int... indices) Creates a new index on the given relation on the given terms positions (indices).
IIndex	createIndex(IRelation relation, int... indices) Creates a new index on the given relation on the given terms positions (indices).

Methods inherited from class java.lang.Object

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

Constructor Detail

SimpleIndexFactory

public SimpleIndexFactory()

Method Detail

createIndex

public IIndex createIndex(IRelation relation,
                          int... indices)

Description copied from interface: IIndexFactory

Creates a new index on the given relation on the given terms positions (indices).

Specified by:

createIndex in interface IIndexFactory

Parameters:

relation - The relation that the index will use.

indices - The ordered collection of indices. This collection must have a size 0 <= size <= arity of the relation. e.g. to create an index on terms c1 and c4 for a relation Q( c0, c1, c2, c3, c4 ), the indices will be { 1, 4 }

Returns:

The new index instance.

createIndex

public IIndex createIndex(IRelation relation,
                          IEquivalentTerms equivalentTerms,
                          int... indices)

Description copied from interface: IIndexFactory

Creates a new index on the given relation on the given terms positions (indices). The index uses the specified equivalent terms to identify equivalent terms. When tuples of this index are matched against a specific key, this index also returns tuples, whose corresponding terms are equivalent to the terms of the key.

Specified by:

createIndex in interface IIndexFactory

Parameters:

relation - The relation that the index will use.

equivalentTerms - The equivalent terms.

indices - The ordered collection of indices. This collection must have a size 0 <= size <= arity of the relation. e.g. to create an index on terms c1 and c4 for a relation Q( c0, c1, c2, c3, c4 ), the indices will be { 1, 4 }

Returns:

The new index instance.