ai.grakn.graql.internal.query

Class QueryOperationExecutor

java.lang.Object

ai.grakn.graql.internal.query.QueryOperationExecutor

public class QueryOperationExecutor
extends Object

A class for executing PropertyExecutors on VarPropertys within Querys.

Multiple query types share this class, such as InsertQuery and DefineQuery.

Author:

Felix Chapman

Method Summary

Modifier and Type	Method and Description
ConceptBuilder	builder(Var var) Return a ConceptBuilder for given Var.
Concept	get(Var var) Return a Concept for a given Var.
Optional<ConceptBuilder>	tryBuilder(Var var) Return a ConceptBuilder for given Var.

Methods inherited from class java.lang.Object

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

Method Detail

builder

public ConceptBuilder builder(Var var)

Return a ConceptBuilder for given Var. This can be used to provide information for how to create the concept that the variable represents.

This method is expected to be called from implementations of VarPropertyInternal.insert(Var), provided they return the given Var in the response to PropertyExecutor.producedVars().

For example, a property may call executor.builder(var).isa(type); in order to provide a type for a var.

Throws:

GraqlQueryException - if the concept in question has already been created

tryBuilder

public Optional<ConceptBuilder> tryBuilder(Var var)

Return a ConceptBuilder for given Var. This can be used to provide information for how to create the concept that the variable represents.

This method is expected to be called from implementations of VarPropertyInternal.insert(Var), provided they return the given Var in the response to PropertyExecutor.producedVars().

For example, a property may call executor.builder(var).isa(type); in order to provide a type for a var.

If the concept has already been created, this will return empty.

get

public Concept get(Var var)

Return a Concept for a given Var.

This method is expected to be called from implementations of VarPropertyInternal.insert(Var), provided they return the given Var in the response to PropertyExecutor.requiredVars().