com.thinkaurelius.titan.graphdb.query.vertex

Class BaseVertexCentricQuery

java.lang.Object

com.thinkaurelius.titan.graphdb.query.BaseQuery

com.thinkaurelius.titan.graphdb.query.vertex.BaseVertexCentricQuery

All Implemented Interfaces:

Query

Direct Known Subclasses:

VertexCentricQuery

public class BaseVertexCentricQuery
extends BaseQuery

The base implementation for VertexCentricQuery which does not yet contain a reference to the base vertex of the query. This query is constructed by AbstractVertexCentricQueryBuilder.constructQuery(com.thinkaurelius.titan.graphdb.internal.RelationCategory) and then later extended by single or multi-vertex query which add the vertex to the query.

This class override many methods in ElementQuery - check there for a description.

Author:

Matthias Broecheler (me@matthiasb.com)

Field Summary

Fields

Modifier and Type	Field and Description
protected Condition<TitanRelation>	condition The condition of this query in QNF
protected com.tinkerpop.blueprints.Direction	direction The direction condition of this query.
protected List<BackendQueryHolder<SliceQuery>>	queries The individual component SliceQuery of this query.

Fields inherited from interface com.thinkaurelius.titan.graphdb.query.Query

NO_LIMIT

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	BaseVertexCentricQuery() Construct an empty query
protected	BaseVertexCentricQuery(BaseVertexCentricQuery query)
	BaseVertexCentricQuery(Condition<TitanRelation> condition, com.tinkerpop.blueprints.Direction direction, List<BackendQueryHolder<SliceQuery>> queries, OrderList orders, int limit)

Method Summary

Methods

Modifier and Type	Method and Description
static BaseVertexCentricQuery	emptyQuery()
Condition<TitanRelation>	getCondition()
com.tinkerpop.blueprints.Direction	getDirection()
OrderList	getOrders()
protected List<BackendQueryHolder<SliceQuery>>	getQueries()
BackendQueryHolder<SliceQuery>	getSubQuery(int position)
boolean	isEmpty()
boolean	isSimple() A query is considered 'simple' if it is comprised of just one sub-query and that query is fitted (i.e.
boolean	matches(TitanRelation relation)
int	numSubQueries()
String	toString()

Methods inherited from class com.thinkaurelius.titan.graphdb.query.BaseQuery

getLimit, hasLimit, setLimit

Methods inherited from class java.lang.Object

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

Field Detail

condition

protected final Condition<TitanRelation> condition

The condition of this query in QNF

queries

protected final List<BackendQueryHolder<SliceQuery>> queries

The individual component SliceQuery of this query. This query is considered an OR of the individual components (possibly filtered by the condition if not fitted).

direction

protected final com.tinkerpop.blueprints.Direction direction

The direction condition of this query. This is duplicated from the condition for efficiency reasons.

Constructor Detail

BaseVertexCentricQuery

public BaseVertexCentricQuery(Condition<TitanRelation> condition,
                      com.tinkerpop.blueprints.Direction direction,
                      List<BackendQueryHolder<SliceQuery>> queries,
                      OrderList orders,
                      int limit)

BaseVertexCentricQuery

protected BaseVertexCentricQuery(BaseVertexCentricQuery query)

BaseVertexCentricQuery

protected BaseVertexCentricQuery()

Construct an empty query

Method Detail

emptyQuery

public static BaseVertexCentricQuery emptyQuery()

getCondition

public Condition<TitanRelation> getCondition()

getOrders

public OrderList getOrders()

getDirection

public com.tinkerpop.blueprints.Direction getDirection()

getQueries

protected List<BackendQueryHolder<SliceQuery>> getQueries()

isEmpty

public boolean isEmpty()

numSubQueries

public int numSubQueries()

isSimple

public boolean isSimple()

A query is considered 'simple' if it is comprised of just one sub-query and that query is fitted (i.e. does not require an in-memory filtering).

Returns:

getSubQuery

public BackendQueryHolder<SliceQuery> getSubQuery(int position)

matches

public boolean matches(TitanRelation relation)

toString

public String toString()

Overrides:

toString in class Object