com.thinkaurelius.titan.graphdb.query.vertex

Class SimpleVertexQueryProcessor

java.lang.Object

com.thinkaurelius.titan.graphdb.query.vertex.SimpleVertexQueryProcessor

All Implemented Interfaces:

Iterable<Entry>

public class SimpleVertexQueryProcessor
extends Object
implements Iterable<Entry>

This is an optimization of specifically for VertexCentricQuery that addresses the special but common case that the query is simple (i.e. comprised of only one sub-query and that query is fitted, i.e. does not require in memory filtering). Under these assumptions we can remove a lot of the steps in QueryProcessor: merging of result sets, in-memory filtering and the object instantiation required for in-memory filtering.

With those complexities removed, the query processor can be much simpler which makes it a lot faster and less memory intense.

IMPORTANT: This Iterable is not thread-safe.

Author:

Matthias Broecheler (me@matthiasb.com)

Constructor Summary

Constructors

Constructor and Description
SimpleVertexQueryProcessor(VertexCentricQuery query, StandardTitanTx tx)

Method Summary

Methods

Modifier and Type	Method and Description
Iterator<Entry>	iterator()
Iterable<TitanRelation>	relations() Converts the entries from this query result into actual TitanRelation.
VertexList	vertexIds() Returns the list of adjacent vertex ids for this query.

Methods inherited from class java.lang.Object

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

Constructor Detail

SimpleVertexQueryProcessor

public SimpleVertexQueryProcessor(VertexCentricQuery query,
                          StandardTitanTx tx)

Method Detail

iterator

public Iterator<Entry> iterator()

Specified by:

iterator in interface Iterable<Entry>

relations

public Iterable<TitanRelation> relations()

Converts the entries from this query result into actual TitanRelation.

Returns:

vertexIds

public VertexList vertexIds()

Returns the list of adjacent vertex ids for this query. By reading those ids from the entries directly (without creating objects) we get much better performance.

Returns: