org.janusgraph.graphdb.query

Interface ElementQuery<R extends JanusGraphElement,B extends BackendQuery<B>>

All Superinterfaces:

Query

All Known Implementing Classes:

GraphCentricQuery, VertexCentricQuery

public interface ElementQuery<R extends JanusGraphElement,B extends BackendQuery<B>>
extends Query

A query that returns JanusGraphElements. This query can consist of multiple sub-queries that together form the desired result set.

Author:

Matthias Broecheler ([email protected])

Field Summary

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

NO_LIMIT

Method Summary

Modifier and Type	Method and Description
Comparator<R>	getSortOrder() Returns the expected sort order of this query if any was specified.
BackendQueryHolder<B>	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.
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(R element) Whether the given element matches the conditions of this query.
int	numSubQueries() Returns the number of sub-queries this query is comprised of.

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

getLimit, hasLimit

Method Detail

hasDuplicateResults

boolean hasDuplicateResults()

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

Returns:

true, if duplicate results are possible, else false

isEmpty

boolean isEmpty()

Whether the result set of this query is empty

Returns:

numSubQueries

int numSubQueries()

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

Returns:

getSubQuery

BackendQueryHolder<B> getSubQuery(int position)

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

Parameters:

position -

Returns:

matches

boolean matches(R element)

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.

Parameters:

element -

Returns:

isSorted

boolean isSorted()

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

Returns:

getSortOrder

Comparator<R> getSortOrder()

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

Returns: