org.ow2.jonas.lib.ejb21.sql
Class EjbqlOrderByVisitor

java.lang.Object
  org.ow2.jonas.lib.ejb21.sql.EjbqlAbstractVisitor
      org.ow2.jonas.lib.ejb21.sql.EjbqlOrderByVisitor

All Implemented Interfaces:

EJBQLVisitor

public class EjbqlOrderByVisitor
extends EjbqlAbstractVisitor

Implementation of a visitor that creates a list of org.objectweb.medor.query.api.OrderField to a given ORDER BY clause. Created on Aug 27, 2003

Author:

Helene Joanin

Nested Class Summary

Nested classes/interfaces inherited from class org.ow2.jonas.lib.ejb21.sql.EjbqlAbstractVisitor

EjbqlAbstractVisitor.IdValue, EjbqlAbstractVisitor.VisitorException

Constructor Summary

EjbqlOrderByVisitor(ASTEJBQL ejbql, Map _fields)
Constructor

Method Summary

org.objectweb.medor.query.api.OrderField[]	getOrderFields() get the that was built from visiting the lexical tree
Object	visit(ASTCmpPathExpression node, Object data) Push corresponding MedorField to the stack. cmp_path_expression ::= path was in initial BNF cmp_path_expression ::= {identification_variable | single_valued_cmr_path_expression}.cmp_field
Object	visit(ASTOrderByClause node, Object data) Visit child node.
Object	visit(ASTOrderByItem node, Object data) Visit child node.
Object	visit(ASTPath node, Object data) Push the Node to the stack

Methods inherited from class org.ow2.jonas.lib.ejb21.sql.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, visit, visit, visit, visit

Methods inherited from class java.lang.Object

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

Constructor Detail

EjbqlOrderByVisitor

public EjbqlOrderByVisitor(ASTEJBQL ejbql,
                           Map _fields)
                    throws Exception

Constructor

Parameters:

ejbql - root of the lexical tree of the query

fields - Map with (name,QueryTreeField) pairs of all the variables appear in the query

Throws:

Exception

Method Detail

getOrderFields

public org.objectweb.medor.query.api.OrderField[] getOrderFields()

get the that was built from visiting the lexical tree

visit

public Object visit(ASTOrderByClause node,
                    Object data)

Visit child node. ORDER BY OrderByItem() (, OrderByItem() )*

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 Object visit(ASTOrderByItem node,
                    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 Object visit(ASTCmpPathExpression node,
                    Object data)

Push corresponding MedorField to the stack.
cmp_path_expression ::= path was in initial BNF cmp_path_expression ::= {identification_variable | single_valued_cmr_path_expression}.cmp_field

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 Object visit(ASTPath node,
                    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