Package io.hypersistence.utils.hibernate.query

Class MapResultTransformer<K,V>

java.lang.Object

io.hypersistence.utils.hibernate.query.MapResultTransformer<K,V>

All Implemented Interfaces:

Serializable, org.hibernate.query.ResultListTransformer, org.hibernate.query.TupleTransformer, org.hibernate.transform.ResultTransformer

public class MapResultTransformer<K,V>
extends Object
implements org.hibernate.transform.ResultTransformer

The MapResultTransformer allows us to return a Map from a JPA Query.

If there are aliases named as key or value, then those will be used.

Otherwise, the first column value is the key while the second one is the Map value.

For more details about how to use it, check out this article on vladmihalcea.com.

Since:

2.9.0

Author:

Vlad Mihalcea

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static final String	KEY_ALIAS
static final String	VALUE_ALIAS

Constructor Summary

Constructors

Constructor	Description
MapResultTransformer()

Method Summary

Modifier and Type	Method	Description
List	transformList(List tuples)	Return the Map instead of the default List.
Object	transformTuple(Object[] tuple, String[] aliases)	Transform the tuple into a key/value pair.

Methods inherited from class java.lang.Object

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

Field Details

KEY_ALIAS

public static final String KEY_ALIAS

See Also:

• Constant Field Values

VALUE_ALIAS

public static final String VALUE_ALIAS

See Also:

• Constant Field Values

Constructor Details

MapResultTransformer

public MapResultTransformer()

Method Details

transformTuple

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

Transform the tuple into a key/value pair.

If there are aliases named as key or value, then those will be used.

Otherwise, the first column value is the key while the second one is the Map value.

Specified by:

transformTuple in interface org.hibernate.query.TupleTransformer<K>

Parameters:

tuple - tuple to be transformed to a key/value pair

aliases - column aliases

Returns:

unmodified tuple

transformList

public List transformList(List tuples)

Return the Map instead of the default List.

Specified by:

transformList in interface org.hibernate.query.ResultListTransformer<K>

Specified by:

transformList in interface org.hibernate.transform.ResultTransformer<K>

Parameters:

tuples - tuples

Returns:

the Map result set