org.objectweb.jonas_ejb.lib
Class EjbqlSelectVisitor

java.lang.Object
  org.objectweb.jonas_ejb.lib.EjbqlAbstractVisitor
      org.objectweb.jonas_ejb.lib.EjbqlSelectVisitor

All Implemented Interfaces:

EJBQLVisitor

public class EjbqlSelectVisitor

extends EjbqlAbstractVisitor

Implementation of a visitor that creates the selection projection for corresponding to a given WHERE clause. Created on Sep 6, 2002

Author:

Christophe Ney [cney@batisseurs.com]: Initial developer, Helene Joanin: Take into account the EJBQL version 2.1 syntax., Helene Joanin: Take into account the aggregate select expression.

Nested Class Summary

Nested classes inherited from class org.objectweb.jonas_ejb.lib.EjbqlAbstractVisitor

EjbqlAbstractVisitor.IdValue, EjbqlAbstractVisitor.VisitorException

Constructor Summary

EjbqlSelectVisitor(ASTEJBQL ejbql, java.util.Map _fields, org.objectweb.medor.query.lib.SelectProject sp)
Constructor

Method Summary

org.objectweb.medor.query.api.QueryTree	getQueryTree() get the query tree that was built from visiting the lexical tree.
java.lang.Object	visit(ASTAggregateSelectExpression node, java.lang.Object data) Visit child node
java.lang.Object	visit(ASTCmpPathExpression node, java.lang.Object data) Visit child node
java.lang.Object	visit(ASTIdentificationVariable node, java.lang.Object data) Push the Node to the stack
java.lang.Object	visit(ASTPath node, java.lang.Object data) Push the Node to the stack
java.lang.Object	visit(ASTSelectClause node, java.lang.Object data) Visit child node.
java.lang.Object	visit(ASTSelectExpression node, java.lang.Object data) Visit child node
java.lang.Object	visit(ASTSingleValuedCmrPathExpression node, java.lang.Object data) Visit child node
java.lang.Object	visit(ASTSingleValuedPathExpression node, java.lang.Object data) Visit child node

Methods inherited from class org.objectweb.jonas_ejb.lib.EjbqlAbstractVisitor

basePath, endsWith, mergePath, mergePath, splitPath, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit

Methods inherited from class java.lang.Object

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

Constructor Detail

EjbqlSelectVisitor

public EjbqlSelectVisitor(ASTEJBQL ejbql,
                          java.util.Map _fields,
                          org.objectweb.medor.query.lib.SelectProject sp)
                   throws java.lang.Exception

Constructor

Parameters:

ejbql - root of the lexical tree of the query

_fields - Map with (identifier,JormExtent) pairs

Method Detail

getQueryTree

public org.objectweb.medor.query.api.QueryTree getQueryTree()

get the query tree that was built from visiting the lexical tree. This is a nest if there is an aggregate function or a select projet otherwise.

visit

public java.lang.Object visit(ASTSelectClause node,
                              java.lang.Object data)

Visit child node. SELECT [ DISTINCT ] {select_expression | OBJECT (identification_variable)}

Specified by:

visit in interface EJBQLVisitor

Overrides:

visit in class EjbqlAbstractVisitor

Parameters:

node - the node to visit

data - the current stack

Returns:

null

visit

public java.lang.Object visit(ASTSelectExpression node,
                              java.lang.Object data)

Visit child node

Specified by:

visit in interface EJBQLVisitor

Overrides:

visit in class EjbqlAbstractVisitor

Parameters:

node - the node to visit

data - the current stack

Returns:

null

visit

public java.lang.Object visit(ASTAggregateSelectExpression node,
                              java.lang.Object data)

Visit child node

Specified by:

visit in interface EJBQLVisitor

Overrides:

visit in class EjbqlAbstractVisitor

Parameters:

node - the node to visit

data - the current stack

Returns:

null

visit

public java.lang.Object visit(ASTCmpPathExpression node,
                              java.lang.Object data)

Visit child node

Specified by:

visit in interface EJBQLVisitor

Overrides:

visit in class EjbqlAbstractVisitor

Parameters:

node - the node to visit

data - the current stack

Returns:

null

visit

public java.lang.Object visit(ASTSingleValuedCmrPathExpression node,
                              java.lang.Object data)

Visit child node

Specified by:

visit in interface EJBQLVisitor

Overrides:

visit in class EjbqlAbstractVisitor

Parameters:

node - the node to visit

data - the current stack

Returns:

null

visit

public java.lang.Object visit(ASTSingleValuedPathExpression node,
                              java.lang.Object data)

Visit child node

Specified by:

visit in interface EJBQLVisitor

Overrides:

visit in class EjbqlAbstractVisitor

Parameters:

node - the node to visit

data - the current stack

Returns:

null

visit

public java.lang.Object visit(ASTIdentificationVariable node,
                              java.lang.Object data)

Push the Node to the stack

Specified by:

visit in interface EJBQLVisitor

Overrides:

visit in class EjbqlAbstractVisitor

Parameters:

node - the node to visit

data - the current stack

Returns:

null

visit

public java.lang.Object visit(ASTPath node,
                              java.lang.Object data)

Push the Node to the stack

Specified by:

visit in interface EJBQLVisitor

Overrides:

visit in class EjbqlAbstractVisitor

Parameters:

node - the node to visit

data - the current stack

Returns:

null