org.globus.ogsa.impl.core.service
Class QueryEngineImpl

java.lang.Object
  org.globus.ogsa.impl.core.service.QueryEngineImpl

All Implemented Interfaces:

QueryEngine

public class QueryEngineImpl

extends java.lang.Object

implements QueryEngine

Executes queries on service data sets

See Also:

ServiceDataSet

Field Summary

protected static QueryEngine

globalQueryEngine

Constructor Summary

QueryEngineImpl()

Method Summary

java.lang.Object	executeQuery(ExtensibilityType query, ServiceDataSet serviceDataSet) If no external query evaluators are registered for an incoming query expression, then executeQuery is called on the engine.
ExpressionEvaluator	getEvaluator(QName qname) Gets the evaluator currently registered to handle an expression of the specified qualified name (from the top level element of the XML Schema definition of the expression)
void	registerEvaluator(ExpressionEvaluator evaluator) registers a new evaluator that can be used to evaluate queries on a service.
void	setGlobalEngine(QueryEngine queryEngine) Sets the global engine to delegate to if this engine cannot handle the request.

Methods inherited from class java.lang.Object

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

Field Detail

globalQueryEngine

protected static QueryEngine globalQueryEngine

Constructor Detail

QueryEngineImpl

public QueryEngineImpl()

Method Detail

registerEvaluator

public void registerEvaluator(ExpressionEvaluator evaluator)

Description copied from interface: QueryEngine

registers a new evaluator that can be used to evaluate queries on a service.

Specified by:

registerEvaluator in interface QueryEngine

Parameters:

evaluator - implementation of evaluator to be used for evaluating queries specified in its XML Schema definition.

setGlobalEngine

public void setGlobalEngine(QueryEngine queryEngine)

Description copied from interface: QueryEngine

Sets the global engine to delegate to if this engine cannot handle the request.

Specified by:

setGlobalEngine in interface QueryEngine

Parameters:

queryEngine - a query engine common for all services in a Grid service container

getEvaluator

public ExpressionEvaluator getEvaluator(QName qname)

Description copied from interface: QueryEngine

Gets the evaluator currently registered to handle an expression of the specified qualified name (from the top level element of the XML Schema definition of the expression)

Specified by:

getEvaluator in interface QueryEngine

Returns:

the matching expression evaluator or null if none was found

executeQuery

public java.lang.Object executeQuery(ExtensibilityType query,
                                     ServiceDataSet serviceDataSet)
                              throws FaultType

Description copied from interface: QueryEngine

If no external query evaluators are registered for an incoming query expression, then executeQuery is called on the engine.

Specified by:

executeQuery in interface QueryEngine

Parameters:

serviceDataSet - ServiceDataSet belonging to Grid service instance to execute the query against

Throws:

FaultType