org.eclipse.persistence.internal.jpa.querydef

Class SelectionImpl<X>

java.lang.Object

org.eclipse.persistence.internal.jpa.querydef.SelectionImpl<X>

All Implemented Interfaces:

java.io.Serializable, javax.persistence.criteria.Selection<X>, javax.persistence.TupleElement<X>, InternalSelection

Direct Known Subclasses:

CompoundSelectionImpl, ExpressionImpl

public abstract class SelectionImpl<X>
extends java.lang.Object
implements javax.persistence.criteria.Selection<X>, InternalSelection, java.io.Serializable

Purpose: Contains the implementation of the Selection interface of the JPA criteria API.

Description: The Selection is the expression describing what should be returned by the query.

Since:

EclipseLink 1.2

Author:

gyorke

See Also:

Join, Serialized Form

Constructor Summary

Constructors

Constructor and Description
SelectionImpl(java.lang.Class<X> javaType, Expression expressionNode)

Method Summary

Modifier and Type	Method and Description
javax.persistence.criteria.Selection<X>	alias(java.lang.String name) Assign an alias to the selection.
java.lang.String	getAlias()
java.util.List<javax.persistence.criteria.Selection<?>>	getCompoundSelectionItems() Return selection items composing a compound selection
Expression	getCurrentNode() Returns the current EclipseLink expression at this node in the criteria expression tree
java.lang.Class<? extends X>	getJavaType()
boolean	isCompoundSelection() Whether the selection item is a compound selection
boolean	isConstructor()
boolean	isFrom()
boolean	isRoot()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eclipse.persistence.internal.jpa.querydef.InternalSelection

findRootAndParameters

Constructor Detail

SelectionImpl

public SelectionImpl(java.lang.Class<X> javaType,
                     Expression expressionNode)

Method Detail

getCurrentNode

public Expression getCurrentNode()

Returns the current EclipseLink expression at this node in the criteria expression tree

Specified by:

getCurrentNode in interface InternalSelection

Returns:

the currentNode

alias

public javax.persistence.criteria.Selection<X> alias(java.lang.String name)

Assign an alias to the selection.

Specified by:

alias in interface javax.persistence.criteria.Selection<X>

Parameters:

name - alias

getAlias

public java.lang.String getAlias()

Specified by:

getAlias in interface javax.persistence.TupleElement<X>

getJavaType

public java.lang.Class<? extends X> getJavaType()

Specified by:

getJavaType in interface javax.persistence.TupleElement<X>

getCompoundSelectionItems

public java.util.List<javax.persistence.criteria.Selection<?>> getCompoundSelectionItems()

Return selection items composing a compound selection

Specified by:

getCompoundSelectionItems in interface javax.persistence.criteria.Selection<X>

Returns:

list of selection items

Throws:

java.lang.IllegalStateException - if selection is not a compound selection

isCompoundSelection

public boolean isCompoundSelection()

Whether the selection item is a compound selection

Specified by:

isCompoundSelection in interface javax.persistence.criteria.Selection<X>

Returns:

boolean

isFrom

public boolean isFrom()

Specified by:

isFrom in interface InternalSelection

isRoot

public boolean isRoot()

Specified by:

isRoot in interface InternalSelection

isConstructor

public boolean isConstructor()

Specified by:

isConstructor in interface InternalSelection