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

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static DistinctRootEntityResultTransformer	INSTANCE

Method Summary

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)

Description copied from interface: TupleSubsetResultTransformer

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)

Description copied from interface: TupleSubsetResultTransformer

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.