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

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

All Implemented Interfaces:

EJBQLVisitor

public class EjbqlLimitVisitor
extends EjbqlAbstractVisitor

Implementation of a visitor that creates the limiter ranges corresponding to the LIMIT clause

Author:

Cyrille Blot : Initial developer, Helene Joanin

Nested Class Summary

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

EjbqlAbstractVisitor.IdValue, EjbqlAbstractVisitor.VisitorException

Constructor Summary

EjbqlLimitVisitor(ASTEJBQL ejbql, Class[] paramTypes)
Constructor

Method Summary

EjbqlLimiterRange[]	getLimiterRanges()
Object	visit(ASTInputParameter node, Object data) Node with value set to parameter index (1..n) string.
Object	visit(ASTIntegerLiteral node, Object data) Visit child nodes literal ::= integer_literal Push the corresponding EjbqlLimiterRange to the stack
Object	visit(ASTLimitClause node, Object data) Visit child node.
Object	visit(ASTLimitExpression node, Object data) Visit child node LimitExpression().

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

EjbqlLimitVisitor

public EjbqlLimitVisitor(ASTEJBQL ejbql,
                         Class[] paramTypes)
                  throws Exception

Constructor

Parameters:

ejbql - root of the lexical tree of the query

paramTypes - Types of the parameters list of the finder/select method

Throws:

Exception - in error case

Method Detail

getLimiterRanges

public EjbqlLimiterRange[] getLimiterRanges()

Returns:

returns the limiter ranges of the LIMIT clause. May be 0 element if no LIMIT clause, 1 or 2 elements otherwise.

visit

public Object visit(ASTLimitClause node,
                    Object data)

Visit child node. LIMIT LimitExpression() ( , LimitExpression())?

Specified by:

visit in interface EJBQLVisitor

Overrides:

visit in class EjbqlAbstractVisitor

Parameters:

node - sub-root of the lexical tree

data - stack

Returns:

returns null

visit

public Object visit(ASTLimitExpression node,
                    Object data)

Visit child node LimitExpression().

Specified by:

visit in interface EJBQLVisitor

Overrides:

visit in class EjbqlAbstractVisitor

Parameters:

node - sub-root of the lexical tree

data - stack

Returns:

returns null

visit

public Object visit(ASTIntegerLiteral node,
                    Object data)

Visit child nodes literal ::= integer_literal Push the corresponding EjbqlLimiterRange to the stack

Specified by:

visit in interface EJBQLVisitor

Overrides:

visit in class EjbqlAbstractVisitor

Parameters:

node - sub-root of the lexical tree

data - stack

Returns:

returns null

visit

public Object visit(ASTInputParameter node,
                    Object data)

Node with value set to parameter index (1..n) string. Push the corresponding EjbqlLimiterRange to the stack

Specified by:

visit in interface EJBQLVisitor

Overrides:

visit in class EjbqlAbstractVisitor

Parameters:

node - sub-root of the lexical tree

data - stack

Returns:

returns null