Interface QueryDelegatableData

All Known Implementing Classes:

RDBMSStore

public interface QueryDelegatableData

Data source able to delegate the evaluation of higher-level queries.

Method Summary

Modifier and Type	Method	Description
default Stream<Substitution>	evaluate(Query query)	Try to evaluate a basic query
Stream<Substitution>	evaluate(Query query, boolean distinct)	Try to evaluate a basic query
boolean	isEvaluable(Query query)	Checks if a query can be evaluated

Method Details

isEvaluable

boolean isEvaluable(Query query)

Checks if a query can be evaluated

Parameters:

query - the query to check

Returns:

true iff tryEvaluate returns a non-empty optional

evaluate

Stream<Substitution> evaluate(Query query,
 boolean distinct)
                       throws EvaluationException

Try to evaluate a basic query

Parameters:

query - the query to evaluate

distinct - whether duplicate substitutions should be filtered out

Returns:

Empty if the query is not evaluable, otherwise a stream containing substitutions that are the answers to the query

Throws:

EvaluationException - if delegated evaluation fails

evaluate

default Stream<Substitution> evaluate(Query query)
                               throws EvaluationException

Try to evaluate a basic query

Parameters:

query - the query to evaluate

Returns:

Empty if the query is not evaluable, otherwise a stream containing substitutions that are the answers to the query

Throws:

EvaluationException - if delegated evaluation fails