org.objectweb.speedo.query.lib
Class QueryEvalContext

java.lang.Object
  org.objectweb.speedo.query.lib.QueryEvalContext

public class QueryEvalContext

extends java.lang.Object

Represent a Medor query executed for a JDO query. It contains the query, the evaluator, a link to the SpeedoCompiledQuery and some information about the data prefetching. A JDO can correspond to several Medor query in case of inheritance for example.

Author:

S.Chassande-Barrioz

Field Summary

org.objectweb.medor.eval.api.QueryEvaluator	evaluator the evaluator of the query
org.objectweb.jorm.api.PClassMapping	pcm the PClassMapping of the prefetched class
int	pnIndex is the index of the identifier (prefetch index too)
org.objectweb.medor.query.api.QueryTree	query The medor querytree representing the query
SpeedoCompiledQuery	sqc The original speedo compiled query

Constructor Summary

QueryEvalContext(org.objectweb.medor.query.api.QueryTree qt, SpeedoCompiledQuery sqc)

Method Summary

org.objectweb.medor.tuple.api.TupleCollection	eval(ProxyManager pm, org.objectweb.medor.expression.api.ParameterOperand[] pos, java.lang.Object connection, QueryDefinition userqd) Executes the sub query
protected java.lang.String	posToString(org.objectweb.medor.expression.api.ParameterOperand[] pos) Produces a String representation of parameter for logging.

Methods inherited from class java.lang.Object

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

Field Detail

query

public org.objectweb.medor.query.api.QueryTree query

The medor querytree representing the query

evaluator

public org.objectweb.medor.eval.api.QueryEvaluator evaluator

the evaluator of the query

pnIndex

public int pnIndex

is the index of the identifier (prefetch index too)

pcm

public org.objectweb.jorm.api.PClassMapping pcm

the PClassMapping of the prefetched class

sqc

public SpeedoCompiledQuery sqc

The original speedo compiled query

Constructor Detail

QueryEvalContext

public QueryEvalContext(org.objectweb.medor.query.api.QueryTree qt,
                        SpeedoCompiledQuery sqc)

Parameters:

qt - is the medor querytree representing the query

sqc - is the original speedo compiled query

Method Detail

eval

public org.objectweb.medor.tuple.api.TupleCollection eval(ProxyManager pm,
                                                          org.objectweb.medor.expression.api.ParameterOperand[] pos,
                                                          java.lang.Object connection,
                                                          QueryDefinition userqd)
                                                   throws org.objectweb.medor.api.MedorException

Executes the sub query

Parameters:

pm - is the current persistence manager

pos - is the parameter of the query

connection - is the way to reach the persistence support

Returns:

a TupleCollection containing the result

Throws:

org.objectweb.medor.api.MedorException

posToString

protected java.lang.String posToString(org.objectweb.medor.expression.api.ParameterOperand[] pos)

Produces a String representation of parameter for logging.