org.janusgraph.graphdb.query.graph

Class GraphCentricQuery

java.lang.Object

org.janusgraph.graphdb.query.BaseQuery

org.janusgraph.graphdb.query.graph.GraphCentricQuery

All Implemented Interfaces:

ElementQuery<JanusGraphElement,JointIndexQuery>, ProfileObservable, Query

public class GraphCentricQuery
extends BaseQuery
implements ElementQuery<JanusGraphElement,JointIndexQuery>

An executable ElementQuery for JanusGraphQuery. This query contains the condition, and only one sub-query JointIndexQuery. It also maintains the ordering for the query result which is needed by the QueryProcessor to correctly order the result.

Author:

Matthias Broecheler (me@matthiasb.com)

Field Summary

Fields inherited from interface org.janusgraph.graphdb.query.Query

NO_LIMIT

Constructor Summary

Constructors

Constructor and Description
GraphCentricQuery(ElementCategory resultType, Condition<JanusGraphElement> condition, OrderList orders, BackendQueryHolder<JointIndexQuery> indexQuery, int limit)

Method Summary

Modifier and Type	Method and Description
static GraphCentricQuery	emptyQuery(ElementCategory resultType)
boolean	equals(Object other)
Condition<JanusGraphElement>	getCondition()
BackendQueryHolder<JointIndexQuery>	getIndexQuery()
OrderList	getOrder()
QueryProfiler	getProfiler()
ElementCategory	getResultType()
Comparator<JanusGraphElement>	getSortOrder() Returns the expected sort order of this query if any was specified.
BackendQueryHolder<JointIndexQuery>	getSubQuery(int position) Returns the backend query at the given position that comprises this ElementQuery
boolean	hasDuplicateResults() Whether the combination of the individual sub-queries can result in duplicate results.
int	hashCode()
boolean	isEmpty() Whether the result set of this query is empty
boolean	isSorted() Whether this query expects the results to be in a particular sort order.
boolean	matches(JanusGraphElement element) Whether the given element matches the conditions of this query.
int	numSubQueries() Returns the number of sub-queries this query is comprised of.
void	observeWith(QueryProfiler profiler, boolean hasSiblings)
String	toString()

Methods inherited from class org.janusgraph.graphdb.query.BaseQuery

getLimit, hasLimit, setLimit

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.janusgraph.graphdb.query.Query

getLimit, hasLimit

Methods inherited from interface org.janusgraph.graphdb.query.profile.ProfileObservable

observeWith

Constructor Detail

GraphCentricQuery

public GraphCentricQuery(ElementCategory resultType,
                         Condition<JanusGraphElement> condition,
                         OrderList orders,
                         BackendQueryHolder<JointIndexQuery> indexQuery,
                         int limit)

Method Detail

emptyQuery

public static GraphCentricQuery emptyQuery(ElementCategory resultType)

getCondition

public Condition<JanusGraphElement> getCondition()

getResultType

public ElementCategory getResultType()

getOrder

public OrderList getOrder()

toString

public String toString()

Overrides:

toString in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object other)

Overrides:

equals in class Object

isEmpty

public boolean isEmpty()

Description copied from interface: ElementQuery

Whether the result set of this query is empty

Specified by:

isEmpty in interface ElementQuery<JanusGraphElement,JointIndexQuery>

Returns:

numSubQueries

public int numSubQueries()

Description copied from interface: ElementQuery

Returns the number of sub-queries this query is comprised of.

Specified by:

numSubQueries in interface ElementQuery<JanusGraphElement,JointIndexQuery>

Returns:

getIndexQuery

public BackendQueryHolder<JointIndexQuery> getIndexQuery()

getSubQuery

public BackendQueryHolder<JointIndexQuery> getSubQuery(int position)

Description copied from interface: ElementQuery

Returns the backend query at the given position that comprises this ElementQuery

Specified by:

getSubQuery in interface ElementQuery<JanusGraphElement,JointIndexQuery>

Returns:

isSorted

public boolean isSorted()

Description copied from interface: ElementQuery

Whether this query expects the results to be in a particular sort order.

Specified by:

isSorted in interface ElementQuery<JanusGraphElement,JointIndexQuery>

Returns:

getSortOrder

public Comparator<JanusGraphElement> getSortOrder()

Description copied from interface: ElementQuery

Returns the expected sort order of this query if any was specified. Check ElementQuery.isSorted() first.

Specified by:

getSortOrder in interface ElementQuery<JanusGraphElement,JointIndexQuery>

Returns:

hasDuplicateResults

public boolean hasDuplicateResults()

Description copied from interface: ElementQuery

Whether the combination of the individual sub-queries can result in duplicate results. Indicates to the query executor whether the results need to be de-duplicated

Specified by:

hasDuplicateResults in interface ElementQuery<JanusGraphElement,JointIndexQuery>

Returns:

true, if duplicate results are possible, else false

matches

public boolean matches(JanusGraphElement element)

Description copied from interface: ElementQuery

Whether the given element matches the conditions of this query.

Used for result filtering if the result set returned by the query executor is not fitted.

Specified by:

matches in interface ElementQuery<JanusGraphElement,JointIndexQuery>

Returns:

observeWith

public void observeWith(QueryProfiler profiler,
                        boolean hasSiblings)

Specified by:

observeWith in interface ProfileObservable

getProfiler

public QueryProfiler getProfiler()

Specified by:

getProfiler in interface ProfileObservable