org.hibernate.transform

Class DistinctRootEntityResultTransformer

java.lang.Object

org.hibernate.transform.DistinctRootEntityResultTransformer

All Implemented Interfaces:

Serializable, ResultTransformer, TupleSubsetResultTransformer

public class DistinctRootEntityResultTransformer
extends Object
implements TupleSubsetResultTransformer

Much like RootEntityResultTransformer, but we also distinct the entity in the final result.

Since this transformer is stateless, all instances would be considered equal. So for optimization purposes we limit it to a single, singleton instance.

Author:

Gavin King, Steve Ebersole

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static DistinctRootEntityResultTransformer	INSTANCE

Method Summary

Methods

Modifier and Type	Method and Description
boolean[]	includeInTransform(String[] aliases, int tupleLength) Returns an array with the i-th element indicating whether the i-th element of the tuple is included in the transformed value.
boolean	isTransformedValueATupleElement(String[] aliases, int tupleLength) When a tuple is transformed, is the result a single element of the tuple?
List	transformList(List list) Simply delegates to DistinctResultTransformer.transformList(java.util.List).
Object	transformTuple(Object[] tuple, String[] aliases) Simply delegates to RootEntityResultTransformer.transformTuple(java.lang.Object[], java.lang.String[]).

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final DistinctRootEntityResultTransformer INSTANCE

Method Detail

transformTuple

public Object transformTuple(Object[] tuple,
                    String[] aliases)

Simply delegates to RootEntityResultTransformer.transformTuple(java.lang.Object[], java.lang.String[]).

Specified by:

transformTuple in interface ResultTransformer

Parameters:

tuple - The tuple to transform

aliases - The tuple aliases

Returns:

The transformed tuple row.

transformList

public List transformList(List list)

Simply delegates to DistinctResultTransformer.transformList(java.util.List).

Specified by:

transformList in interface ResultTransformer

Parameters:

list - The list to transform.

Returns:

The transformed List.

includeInTransform

public boolean[] includeInTransform(String[] aliases,
                           int tupleLength)

Returns an array with the i-th element indicating whether the i-th element of the tuple is included in the transformed value.

Specified by:

includeInTransform in interface TupleSubsetResultTransformer

Parameters:

aliases - - the aliases that correspond to the tuple

tupleLength - - the number of elements in the tuple

Returns:

array with the i-th element indicating whether the i-th element of the tuple is included in the transformed value.

isTransformedValueATupleElement

public boolean isTransformedValueATupleElement(String[] aliases,
                                      int tupleLength)

When a tuple is transformed, is the result a single element of the tuple?

Specified by:

isTransformedValueATupleElement in interface TupleSubsetResultTransformer

Parameters:

aliases - - the aliases that correspond to the tuple

tupleLength - - the number of elements in the tuple

Returns:

true, if the transformed value is a single element of the tuple; false, otherwise.