org.openanzo.glitter.query
Interface QueryValidator

All Known Implementing Classes:

WellDesignedOptionalsValidator

public interface QueryValidator

A QueryValidator is a stateful class that determines whether or not the engine will accept a given query. A single query might have to pass multiple QueryValidators before being evaluated against an RDF dataset.

Author:

Lee

Method Summary

java.lang.String	getValidationError() This method's return value is only valid after a call to validateQuery on the same instance returns false.
java.lang.String	getValidatorDescription() Returns a human-readable description of what this QueryValidator checks for.
boolean	validateQuery(GraphPattern query)

Method Detail

validateQuery

boolean validateQuery(GraphPattern query)

Parameters:

query - The query pattern of the query to be validated

Returns:

True, if the query is OK; False, otherwise. If false, then getValidationError() may be called to return the reason for the failure to validate.

getValidationError

java.lang.String getValidationError()

This method's return value is only valid after a call to validateQuery on the same instance returns false.

Returns:

The reason for a failure to validate.

getValidatorDescription

java.lang.String getValidatorDescription()

Returns a human-readable description of what this QueryValidator checks for.

Returns:

A human-readable description of what this QueryValidator checks for.