ddf.catalog.util.impl

Interface QueryFunction

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface QueryFunction

Functional interface used to abstract away methods that take in a QueryRequest and return a SourceResponse. Used by classes such as ResultIterable to support interfaces other than CatalogFramework.

Method Summary

Modifier and Type	Method and Description
SourceResponse	query(QueryRequest queryRequest) Runs a query.

Method Detail

query

SourceResponse query(QueryRequest queryRequest)
              throws UnsupportedQueryException,
                     SourceUnavailableException,
                     FederationException

Runs a query.

Parameters:

queryRequest - request to use

Returns:

source response

Throws:

SourceUnavailableException - if a required Source is unavailable

UnsupportedQueryException - if the Query can not be evaluated by this CatalogFramework or any of its Sources.

FederationException - if the QueryRequest includes FederatedSources and there is either a problem connecting to a FederatedSource or a FederatedSource cannot evaluate the Query