org.jboss.dna.graph.query.process
Class QueryProcessor

java.lang.Object
  org.jboss.dna.graph.query.process.QueryProcessor

All Implemented Interfaces:

Processor

public abstract class QueryProcessor
extends Object
implements Processor

An abstract Processor implementation that builds a tree of ProcessingComponent objects to perform the different parts of the query processing logic. Subclasses are required to only implement one method: the #createAccessComponent(QueryCommand,QueryContext, PlanNode, Columns, Analyzer) should create a ProcessorComponent object that will perform the (low-level access) query described by the plan given as a parameter.

Constructor Summary

QueryProcessor()

Method Summary

QueryResults

execute(QueryContext context, QueryCommand command, QueryResults.Statistics statistics, PlanNode plan) Process the supplied query plan for the given command and return the results.

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryProcessor

public QueryProcessor()

Method Detail

execute

public QueryResults execute(QueryContext context,
                            QueryCommand command,
                            QueryResults.Statistics statistics,
                            PlanNode plan)

Process the supplied query plan for the given command and return the results.

Specified by:

execute in interface Processor

Parameters:

context - the context in which the command is being processed

command - the command being executed

statistics - the time metrics up until this execution

plan - the plan to be processed

Returns:

the results of the query

See Also:

Processor.execute(org.jboss.dna.graph.query.QueryContext, org.jboss.dna.graph.query.model.QueryCommand, org.jboss.dna.graph.query.QueryResults.Statistics, org.jboss.dna.graph.query.plan.PlanNode)