org.openanzo.glitter.query
Class QueryExecutorFactory

java.lang.Object
  org.openanzo.glitter.query.QueryExecutorFactory

public class QueryExecutorFactory
extends java.lang.Object

A QueryExecutorFactory returns QueryExecutor's that can execute a given query with a given SolutionGenerator. This is a singleton class.

Author:

Lee

Method Summary

QueryExecutor	createQueryExecutor(EngineConfig config, QueryController qc, SolutionGenerator sg, QueryExecutionPlan plan) Selects an appropriate QueryExecutor based upon the engine configuration and the capabilities of the backend solution generator.
static QueryExecutorFactory	getQueryExecutorFactory()

Methods inherited from class java.lang.Object

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

Method Detail

getQueryExecutorFactory

public static QueryExecutorFactory getQueryExecutorFactory()

Returns:

The singleton QueryExecutorFactory.

createQueryExecutor

public QueryExecutor createQueryExecutor(EngineConfig config,
                                         QueryController qc,
                                         SolutionGenerator sg,
                                         QueryExecutionPlan plan)

Selects an appropriate QueryExecutor based upon the engine configuration and the capabilities of the backend solution generator.

Parameters:

config - The engine configuration

qc - The parsed and prepared query

sg - The backend solution generator

plan - A query execution plan

Returns:

An initialized QueryExecutor.