ai.grakn.graql.internal.reasoner.query

Class QueryAnswers

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractSet<E>

java.util.HashSet<Map<VarName,Concept>>

ai.grakn.graql.internal.reasoner.query.QueryAnswers

All Implemented Interfaces:

Serializable, Cloneable, Iterable<Map<VarName,Concept>>, Collection<Map<VarName,Concept>>, Set<Map<VarName,Concept>>

public class QueryAnswers
extends HashSet<Map<VarName,Concept>>

Wrapper class for a set of answers providing higher level filtering facilities as well as unification and join operations.

Author:

Kasper Piskorski

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
QueryAnswers()
QueryAnswers(Collection<? extends Map<VarName,Concept>> ans)

Method Summary

Modifier and Type	Method and Description
QueryAnswers	filterByTypes(Map<VarName,Type> varTypeMap) filter answers by discarding answers not adhering to specific types
QueryAnswers	filterIncomplete(Set<VarName> vars) filter answers by discarding answers with incomplete set of variables
QueryAnswers	filterKnown(QueryAnswers known) filter answers by discarding the already known ones
QueryAnswers	filterNonEquals(Query query) filter answers by applying NonEquals filters
QueryAnswers	filterVars(Set<VarName> vars) filter answers by constraining the variable set to the provided one
static QueryAnswers	getUnifiedAnswers(AtomicQuery parentQuery, AtomicQuery childQuery, QueryAnswers answers) unify answers of childQuery with parentQuery
Set<VarName>	getVars()
QueryAnswers	join(QueryAnswers localTuples) perform a join operation between this and provided answers
QueryAnswers	unify(Map<VarName,VarName> unifiers) unify the answers by applying unifiers to variable set

Methods inherited from class java.util.HashSet

add, clear, clone, contains, isEmpty, iterator, remove, size, spliterator

Methods inherited from class java.util.AbstractSet

equals, hashCode, removeAll

Methods inherited from class java.util.AbstractCollection

addAll, containsAll, retainAll, toArray, toArray, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Set

addAll, containsAll, equals, hashCode, removeAll, retainAll, toArray, toArray

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream

Methods inherited from interface java.lang.Iterable

forEach

Constructor Detail

QueryAnswers

public QueryAnswers()

QueryAnswers

public QueryAnswers(Collection<? extends Map<VarName,Concept>> ans)

Method Detail

getVars

public Set<VarName> getVars()

filterVars

public QueryAnswers filterVars(Set<VarName> vars)

filter answers by constraining the variable set to the provided one

Parameters:

vars - set of variable names

Returns:

filtered answers

filterKnown

public QueryAnswers filterKnown(QueryAnswers known)

filter answers by discarding the already known ones

Parameters:

known - set of known answers

Returns:

filtered answers

filterIncomplete

public QueryAnswers filterIncomplete(Set<VarName> vars)

filter answers by discarding answers with incomplete set of variables

Parameters:

vars - variable set considered complete

Returns:

filtered answers

filterNonEquals

public QueryAnswers filterNonEquals(Query query)

filter answers by applying NonEquals filters

Parameters:

query - query containing filters

Returns:

filtered answers

filterByTypes

public QueryAnswers filterByTypes(Map<VarName,Type> varTypeMap)

filter answers by discarding answers not adhering to specific types

Parameters:

varTypeMap - map of variable name - corresponding type pairs

Returns:

filtered vars

join

public QueryAnswers join(QueryAnswers localTuples)

perform a join operation between this and provided answers

Parameters:

localTuples - right operand of join operation

Returns:

joined answers

unify

public QueryAnswers unify(Map<VarName,VarName> unifiers)

unify the answers by applying unifiers to variable set

Parameters:

unifiers - map of [key: from/value: to] unifiers

Returns:

unified query answers

getUnifiedAnswers

public static QueryAnswers getUnifiedAnswers(AtomicQuery parentQuery,
                                             AtomicQuery childQuery,
                                             QueryAnswers answers)

unify answers of childQuery with parentQuery

Parameters:

parentQuery - parent atomic query containing target variables

Returns:

unified answers