ai.grakn.graql.internal.reasoner.query

Class QueryAnswerStream

java.lang.Object

ai.grakn.graql.internal.reasoner.query.QueryAnswerStream

public class QueryAnswerStream
extends Object

Wrapper class providing higher level stream operations streams of Answer.

Author:

Kasper Piskorski

Constructor Summary

Constructors

Constructor and Description
QueryAnswerStream()

Method Summary

Modifier and Type	Method and Description
static boolean	entityTypeFilter(Answer answer, Set<TypeAtom> types)
static java.util.stream.Stream<Answer>	join(java.util.stream.Stream<Answer> stream, java.util.stream.Stream<Answer> stream2) lazy stream join
static java.util.stream.Stream<Answer>	join(java.util.stream.Stream<Answer> stream, java.util.stream.Stream<Answer> stream2, com.google.common.collect.ImmutableSet<Var> joinVars, boolean explanation) lazy stream join with quasi- sideways information propagation
static java.util.stream.Stream<Answer>	joinWithInverse(java.util.stream.Stream<Answer> stream, java.util.stream.Stream<Answer> stream2, Map<javafx.util.Pair<Var,Concept>,Set<Answer>> stream2InverseMap, com.google.common.collect.ImmutableSet<Var> joinVars, boolean explanation) lazy stream join with fast lookup from inverse answer map
static boolean	knownFilter(Answer answer, java.util.stream.Stream<Answer> known)
static boolean	subFilter(Answer answer, Set<IdPredicate> subs)

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryAnswerStream

public QueryAnswerStream()

Method Detail

knownFilter

public static boolean knownFilter(Answer answer,
                                  java.util.stream.Stream<Answer> known)

subFilter

public static boolean subFilter(Answer answer,
                                Set<IdPredicate> subs)

entityTypeFilter

public static boolean entityTypeFilter(Answer answer,
                                       Set<TypeAtom> types)

join

public static java.util.stream.Stream<Answer> join(java.util.stream.Stream<Answer> stream,
                                                   java.util.stream.Stream<Answer> stream2)

lazy stream join

Parameters:

stream - left stream operand

stream2 - right stream operand

Returns:

joined stream

join

public static java.util.stream.Stream<Answer> join(java.util.stream.Stream<Answer> stream,
                                                   java.util.stream.Stream<Answer> stream2,
                                                   com.google.common.collect.ImmutableSet<Var> joinVars,
                                                   boolean explanation)

lazy stream join with quasi- sideways information propagation

Parameters:

stream - left stream operand

stream2 - right stream operand

joinVars - intersection on variables of two streams

Returns:

joined stream

joinWithInverse

public static java.util.stream.Stream<Answer> joinWithInverse(java.util.stream.Stream<Answer> stream,
                                                              java.util.stream.Stream<Answer> stream2,
                                                              Map<javafx.util.Pair<Var,Concept>,Set<Answer>> stream2InverseMap,
                                                              com.google.common.collect.ImmutableSet<Var> joinVars,
                                                              boolean explanation)

lazy stream join with fast lookup from inverse answer map

Parameters:

stream - left stream operand

stream2 - right stream operand

stream2InverseMap - inverse map of right operand from cache

joinVars - intersection on variables of two streams

Returns:

joined stream