org.apache.openjpa.kernel.exps
Class BindVariableExpression

java.lang.Object
  org.apache.openjpa.kernel.exps.Exp
      org.apache.openjpa.kernel.exps.BindVariableExpression

All Implemented Interfaces:

Serializable, Expression

Direct Known Subclasses:

BindKeyVariableExpression, BindValueVariableExpression

 class BindVariableExpression
extends Exp

Binds a variable to a collection.

Author:

Abe White

Constructor Summary

BindVariableExpression(BoundVariable var, Val val)
Constructor.

Method Summary

void	acceptVisit(ExpressionVisitor visitor) Accept a visit from a tree visitor.
protected boolean	eval(Collection candidates, StoreContext ctx, Object[] params) Evaluate the expression for the given group.
protected boolean	eval(Object candidate, Object orig, StoreContext ctx, Object[] params) Evaluate the expression for the given context candidate and original candidate.
protected Collection	getCollection(Object values) Return a collection for the given object, produced by eval'ing the value of this expression.
BoundVariable	getVariable()
Collection	getVariableValues(Object candidate, Object orig, StoreContext ctx, Object[] params) Return the possible values that variable can take.

Methods inherited from class org.apache.openjpa.kernel.exps.Exp

evaluate, evaluate

Methods inherited from class java.lang.Object

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

Constructor Detail

BindVariableExpression

public BindVariableExpression(BoundVariable var,
                              Val val)

Constructor.

Parameters:

var - the bound variable

val - the value the variable is bound to

Method Detail

getVariable

public BoundVariable getVariable()

getVariableValues

public Collection getVariableValues(Object candidate,
                                    Object orig,
                                    StoreContext ctx,
                                    Object[] params)

Return the possible values that variable can take.

getCollection

protected Collection getCollection(Object values)

Return a collection for the given object, produced by eval'ing the value of this expression. Simply casts the object to a collection by default.

eval

protected boolean eval(Object candidate,
                       Object orig,
                       StoreContext ctx,
                       Object[] params)

Description copied from class: Exp

Evaluate the expression for the given context candidate and original candidate.

Overrides:

eval in class Exp

eval

protected boolean eval(Collection candidates,
                       StoreContext ctx,
                       Object[] params)

Description copied from class: Exp

Evaluate the expression for the given group.

Overrides:

eval in class Exp

acceptVisit

public void acceptVisit(ExpressionVisitor visitor)

Description copied from interface: Expression

Accept a visit from a tree visitor.

Specified by:

acceptVisit in interface Expression

Overrides:

acceptVisit in class Exp