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, InternalSelection

Direct Known Subclasses:

CompoundSelectionImpl, ExpressionImpl

public abstract class SelectionImpl<X>
extends java.lang.Object
implements 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

Field Summary

Fields

Modifier and Type	Field and Description
protected java.lang.String	alias
protected Expression	currentNode
protected java.lang.Class<X>	javaType

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
<any>	alias(java.lang.String name) Assign an alias to the selection.
java.lang.String	getAlias()
java.util.List<<any>>	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

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

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

findRootAndParameters

Field Detail

javaType

protected java.lang.Class<X> javaType

currentNode

protected Expression currentNode

alias

protected java.lang.String alias

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 <any> alias(java.lang.String name)

Assign an alias to the selection.

Parameters:

name - alias

getAlias

public java.lang.String getAlias()

getJavaType

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

getCompoundSelectionItems

public java.util.List<<any>> getCompoundSelectionItems()

Return selection items composing a compound selection

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

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