org.apache.openjpa.persistence.criteria
Class ParameterExpressionImpl<T>

java.lang.Object
  org.apache.openjpa.persistence.criteria.SelectionImpl<X>
      org.apache.openjpa.persistence.criteria.ExpressionImpl<T>
          org.apache.openjpa.persistence.criteria.ParameterExpressionImpl<T>

Type Parameters:

T - the type of value held by this parameter.

All Implemented Interfaces:

Expression<T>, ParameterExpression<T>, Selection<T>, Parameter<T>, TupleElement<T>, CriteriaExpression

 class ParameterExpressionImpl<T>
extends ExpressionImpl<T>
implements ParameterExpression<T>

Parameter of a criteria query.
A parameter in CriteriaQuery is always a named parameter but can be constructed with a null name. Positional parameters are not allowed in CriteraQuery.

Author:

Pinaki Poddar, Fay wang

Constructor Summary

ParameterExpressionImpl(Class<T> cls, String name)
Construct a Parameter of given expected value type and name.

Method Summary

StringBuilder	asValue(AliasContext q) Get a string representation of this node as a value in the context of the given query.
String	getName() Gets the name of this parameter.
Class<T>	getParameterType()
Integer	getPosition() Raises an internal exception because parameters of CriteriaQuery are not positional.
(package private) void	setIndex(int index)
String	toString()
Value	toValue(ExpressionFactory factory, CriteriaQueryImpl<?> q) Bridge contract to convert this facade expression to a kernel value.

Methods inherited from class org.apache.openjpa.persistence.criteria.ExpressionImpl

as, in, in, in, in, isNotNull, isNull, toKernelExpression

Methods inherited from class org.apache.openjpa.persistence.criteria.SelectionImpl

acceptVisit, alias, asProjection, assertValidName, asVariable, getAlias, getCompoundSelectionItems, getJavaType, isAliased, isAutoAliased, isCompoundSelection, setAutoAlias

Methods inherited from class java.lang.Object

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

Methods inherited from interface javax.persistence.criteria.Expression

as, in, in, in, in, isNotNull, isNull

Methods inherited from interface javax.persistence.criteria.Selection

alias, getCompoundSelectionItems, isCompoundSelection

Methods inherited from interface javax.persistence.TupleElement

getAlias, getJavaType

Constructor Detail

ParameterExpressionImpl

public ParameterExpressionImpl(Class<T> cls,
                               String name)

Construct a Parameter of given expected value type and name.

Parameters:

cls - expected value type

name - name of the parameter which can be null.

Method Detail

getName

public final String getName()

Gets the name of this parameter. The name can be null.

Specified by:

getName in interface Parameter<T>

getPosition

public final Integer getPosition()

Raises an internal exception because parameters of CriteriaQuery are not positional.

Specified by:

getPosition in interface Parameter<T>

setIndex

void setIndex(int index)

toString

public String toString()

Overrides:

toString in class Object

toValue

public Value toValue(ExpressionFactory factory,
                     CriteriaQueryImpl<?> q)

Description copied from class: ExpressionImpl

Bridge contract to convert this facade expression to a kernel value.

Specified by:

toValue in class ExpressionImpl<T>

Parameters:

factory - creates the kernel expression

q - the query definition context of this expression

Returns:

an equivalent kernel value

asValue

public StringBuilder asValue(AliasContext q)

Description copied from interface: CriteriaExpression

Get a string representation of this node as a value in the context of the given query.

Specified by:

asValue in interface CriteriaExpression

Overrides:

asValue in class SelectionImpl<T>

getParameterType

public Class<T> getParameterType()

Specified by:

getParameterType in interface Parameter<T>