jrun.ejb.ejbql
Class NavigationExpression

java.lang.Object
  |
  +--jrun.ejb.ejbql.ExpressionBase
        |
        +--jrun.ejb.ejbql.NavigationExpression

All Implemented Interfaces:

Element, Expression

public class NavigationExpression

extends ExpressionBase

A generalization of the following EJBQL path expressions : SingleValuedPathExpression (e.g. o.customer, o.customer.firstname) CollectionValuedPathExpression : (e.g. o.lineItems) NavigationExpression has the following syntax : IdentificationVar [. CmrField]* . (CmpField | CmrField)

Author:

Enrique Duvos

Fields inherited from interface jrun.ejb.ejbql.Element

UNSPECIFIED_TRAVERSAL_ORDER

Constructor Summary

NavigationExpression()

Method Summary

void	accept(Visitor visitor)
void	addExpression(Expression expression)
void	addOperator(NavigationOperator navigationOp)
java.lang.Object	clone()
boolean	endsInCmpField()
boolean	endsInCmrField()
boolean	equals(java.lang.Object other) Other navigation epressions must have same count and each element must be equal.
AbstractSchemaName	getAbstractSchemaName()
java.util.ListIterator	getChildren(int traversalType) Provide default implementation that returns 0 children.
java.util.Iterator	getFieldNames()
IdentificationVar	getFirstExpression()
java.lang.String	getJavaType() The navigation expression's type is determined by the last symbol and the operator acting on it.
Symbol	getLastExpression()
CmpField	getLastExpressionCmp() Convenience method to return last cmp field of path expression.
CmrField	getLastExpressionCmr() Convenience method to return last cmr field of path expression.
NavigationOperator	getLastOperator()
int	hashCode()
boolean	hasMultipleNavigations()
boolean	isNavigationExpression()
void	removeLastExpression()
int	size()

Methods inherited from class jrun.ejb.ejbql.ExpressionBase

isCmpField, isCmrField, isIdentificationVar, isInputParam, isOperatorExpression

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NavigationExpression

public NavigationExpression()

Method Detail

isNavigationExpression

public boolean isNavigationExpression()

Overrides:

isNavigationExpression in class ExpressionBase

addExpression

public void addExpression(Expression expression)

addOperator

public void addOperator(NavigationOperator navigationOp)

size

public int size()

getJavaType

public java.lang.String getJavaType()

The navigation expression's type is determined by the last symbol and the operator acting on it.

hasMultipleNavigations

public boolean hasMultipleNavigations()

getFirstExpression

public IdentificationVar getFirstExpression()

getLastOperator

public NavigationOperator getLastOperator()

getLastExpression

public Symbol getLastExpression()

getFieldNames

public java.util.Iterator getFieldNames()

endsInCmrField

public boolean endsInCmrField()

getAbstractSchemaName

public AbstractSchemaName getAbstractSchemaName()

getLastExpressionCmr

public CmrField getLastExpressionCmr()

Convenience method to return last cmr field of path expression. Should only be called is endsInCmrField() is true.

endsInCmpField

public boolean endsInCmpField()

getLastExpressionCmp

public CmpField getLastExpressionCmp()

Convenience method to return last cmp field of path expression. Should only be called is endsInCmpField() is true.

accept

public void accept(Visitor visitor)

getChildren

public java.util.ListIterator getChildren(int traversalType)

Description copied from class: ExpressionBase

Provide default implementation that returns 0 children.

Overrides:

getChildren in class ExpressionBase

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object other)

Other navigation epressions must have same count and each element must be equal.

Overrides:

equals in class java.lang.Object

removeLastExpression

public void removeLastExpression()

clone

public java.lang.Object clone()

Overrides:

clone in class java.lang.Object