org.objectweb.jonas_ejb.lib.EjbqlQueryTreeHolder Class Reference

Collaboration diagram for org.objectweb.jonas_ejb.lib.EjbqlQueryTreeHolder:

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Public Member Functions
	EjbqlQueryTreeHolder (MethodCmp2Desc mDesc, ASTEJBQL ejbql, PMapper mapper) throws Exception
QueryTree	getQueryTree ()
void	setQueryOptimizer (QueryTransformer qtf)
QueryTransformer	getQueryOptimizer ()
Field	getResField ()
EjbqlLimiterRange[]	getLimiterRanges ()
QueryEvaluator	getOptimizedQueryTree () throws Exception

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Detailed Description

Class to hold the query tree of a given EJBQL request. This allows walking the JormExtents of the tree to set the mappers.

Author:

Christophe Ney - cney@batisseurs.com : Initial developer

Helene Joanin: Take into account the ORDER BY clause.

Sebastien Chassande-Barrioz & Helene Joanin: prefetch code

Helene Joanin: Take into account the aggregate select expression.

Cyrille Blot: Take into account the LIMIT clause

Definition at line 64 of file EjbqlQueryTreeHolder.java.

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Constructor & Destructor Documentation

org.objectweb.jonas_ejb.lib.EjbqlQueryTreeHolder.EjbqlQueryTreeHolder (  MethodCmp2Desc  mDesc, ASTEJBQL  ejbql, PMapper  mapper )  throws Exception

constructor of a holder for a specific query. Parameters: mDesc  JOnAS meta-information for the corresponding finder/select method ejbql  root of the lexical tree of the query mapper  mapper to associate at each leaves of the QueryTree. The mapper may be null in case of the QueryTree is build in the GenIC phase. Definition at line 89 of file EjbqlQueryTreeHolder.java. References org.objectweb.jonas_ejb.deployment.api.BeanDesc.getDeploymentDesc(), org.objectweb.jonas_ejb.deployment.api.EntityCmp2Desc.getJormClassName(), org.objectweb.jonas_ejb.deployment.api.DeploymentDescEjb2.getJormManager(), and org.objectweb.jonas_ejb.lib.EjbqlSelectVisitor.getQueryTree().

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Member Function Documentation

EjbqlLimiterRange [] org.objectweb.jonas_ejb.lib.EjbqlQueryTreeHolder.getLimiterRanges (   )

Returns: returns the limiter ranges of the LIMIT clause. May be 0 element if no LIMIT clause, 1 or 2 elements otherwise. Definition at line 212 of file EjbqlQueryTreeHolder.java.

QueryEvaluator org.objectweb.jonas_ejb.lib.EjbqlQueryTreeHolder.getOptimizedQueryTree (   )  throws Exception

Get the query evaluator of the optimized query. The query is optimized on first call. All mappers of the query should have been already set with the help of the iterator returned by the getJormExtentIterator method. Definition at line 221 of file EjbqlQueryTreeHolder.java.

QueryTransformer org.objectweb.jonas_ejb.lib.EjbqlQueryTreeHolder.getQueryOptimizer (   )

get the current query tree optimizer Definition at line 198 of file EjbqlQueryTreeHolder.java. Referenced by org.objectweb.jonas_ejb.container.jorm.MedorFactory.getOptimizedRequest().

QueryTree org.objectweb.jonas_ejb.lib.EjbqlQueryTreeHolder.getQueryTree (   )

get the query tree that was built from visiting the lexical tree Definition at line 183 of file EjbqlQueryTreeHolder.java.

Field org.objectweb.jonas_ejb.lib.EjbqlQueryTreeHolder.getResField (   )

get the Medor result Field of the query (useful for the ejbSelect method) Definition at line 205 of file EjbqlQueryTreeHolder.java.

void org.objectweb.jonas_ejb.lib.EjbqlQueryTreeHolder.setQueryOptimizer (  QueryTransformer  qtf  )

Set the optimizer to be used when optimizing the query tree Definition at line 190 of file EjbqlQueryTreeHolder.java. Referenced by org.objectweb.jonas_ejb.container.jorm.MedorFactory.getOptimizedRequest().

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The documentation for this class was generated from the following file:

• src/org/objectweb/jonas_ejb/lib/EjbqlQueryTreeHolder.java

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