ai.grakn.graql.internal.gremlin

Class GremlinQuery

java.lang.Object

ai.grakn.graql.internal.gremlin.GremlinQuery

public class GremlinQuery
extends Object

A class for building gremlin traversals from patterns.

A Query is constructed from a single Pattern.Conjunction. The conjunction is transformed into disjunctive normal form and then an InnerQuery is constructed from each disjunction component. This allows each InnerQuery to be described by a single gremlin traversal.

The Query returns a list of gremlin traversals, whose results are combined by MatchQueryImpl to maintain any requested ordering.

Field Summary

Fields

Modifier and Type	Field and Description
protected org.slf4j.Logger	LOG

Constructor Summary

Constructors

Constructor and Description
GremlinQuery(GraknGraph graph, PatternAdmin pattern, com.google.common.collect.ImmutableSet<String> names)

Method Summary

Modifier and Type	Method and Description
java.util.stream.Stream<GraqlTraversal>	allGraqlTraversals()
java.util.stream.Stream<String>	getConcepts()
org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal<org.apache.tinkerpop.gremlin.structure.Vertex,Map<String,org.apache.tinkerpop.gremlin.structure.Vertex>>	getTraversal()
GraqlTraversal	optimalTraversal() Get a close-to-optimal traversal plan to execute this query

Methods inherited from class java.lang.Object

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

Field Detail

LOG

protected final org.slf4j.Logger LOG

Constructor Detail

GremlinQuery

public GremlinQuery(GraknGraph graph,
                    PatternAdmin pattern,
                    com.google.common.collect.ImmutableSet<String> names)

Parameters:

graph - the graph to execute the query on

pattern - a pattern to find in the graph

names - the variable names to select

Method Detail

optimalTraversal

public GraqlTraversal optimalTraversal()

Get a close-to-optimal traversal plan to execute this query

getTraversal

public org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal<org.apache.tinkerpop.gremlin.structure.Vertex,Map<String,org.apache.tinkerpop.gremlin.structure.Vertex>> getTraversal()

Returns:

a gremlin traversal to execute to find results

getConcepts

public java.util.stream.Stream<String> getConcepts()

Returns:

a stream of concept names mentioned in the query

allGraqlTraversals

public java.util.stream.Stream<GraqlTraversal> allGraqlTraversals()