Package com.github.collinalpert.java2db.mappers

Class EntityMapper<E extends BaseEntity>

java.lang.Object

com.github.collinalpert.java2db.mappers.EntityMapper<E>

All Implemented Interfaces:

Mappable<E>

public class EntityMapper<E extends BaseEntity>
extends Object
implements Mappable<E>

Default mapper for converting a ResultSet to the respective Java entity.

Author:

Collin Alpert

Constructor Summary

Constructors

Constructor	Description
EntityMapper(Class<E> clazz)

Method Summary

Modifier and Type	Method	Description
Optional<E>	map(ResultSet set)	Maps a ResultSet with a single row to a Java entity.
E[]	mapToArray(ResultSet set)	Maps a ResultSet with multiple rows to an array of Java entities.
List<E>	mapToList(ResultSet set)	Maps a ResultSet with multiple rows to a list of Java entities.
<K, V> Map<K,V>	mapToMap(ResultSet set, Function<E,K> keyMapping, Function<E,V> valueMapping)	Maps a ResultSet to a Map.
Set<E>	mapToSet(ResultSet set)	Maps a ResultSet to a Set.
Stream<E>	mapToStream(ResultSet set)	Maps a ResultSet with multiple rows to a Stream of Java entities.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.github.collinalpert.java2db.mappers.Mappable

mapToMap

Constructor Details

EntityMapper

public EntityMapper(Class<E> clazz)

Method Details

map

public Optional<E> map(ResultSet set) throws SQLException

Maps a ResultSet with a single row to a Java entity.

Specified by:

map in interface Mappable<E extends BaseEntity>

Parameters:

set - The ResultSet to map.

Returns:

An Optional which contains the Java entity if the query was successful.

Throws:

SQLException - if the ResultSet.next() call does not work as expected or if the entity fields cannot be set.

mapToList

public List<E> mapToList(ResultSet set) throws SQLException

Maps a ResultSet with multiple rows to a list of Java entities.

Specified by:

mapToList in interface Mappable<E extends BaseEntity>

Parameters:

set - The ResultSet to map.

Returns:

A list of Java entities.

Throws:

SQLException - if the ResultSet.next() call does not work as expected or if the entity fields cannot be set.

mapToStream

public Stream<E> mapToStream(ResultSet set) throws SQLException

Maps a ResultSet with multiple rows to a Stream of Java entities.

Specified by:

mapToStream in interface Mappable<E extends BaseEntity>

Parameters:

set - The ResultSet to map.

Returns:

A Stream of Java entities.

Throws:

SQLException - if the ResultSet.next() call does not work as expected or if the entity fields cannot be set.

mapToArray

public E[] mapToArray(ResultSet set) throws SQLException

Maps a ResultSet with multiple rows to an array of Java entities.

Specified by:

mapToArray in interface Mappable<E extends BaseEntity>

Parameters:

set - The ResultSet to map.

Returns:

An array of Java entities.

Throws:

SQLException - if the ResultSet.next() call does not work as expected or if the entity fields cannot be set.

mapToMap

public <K, V> Map<K,V> mapToMap(ResultSet set, Function<E,K> keyMapping, Function<E,V> valueMapping) throws SQLException

Maps a ResultSet to a Map.

Specified by:

mapToMap in interface Mappable<E extends BaseEntity>

Type Parameters:

K - The type of the keys in the map.

V - The type of the values in the map.

Parameters:

set - The ResultSet to get the data from.

keyMapping - The key function of the map.

valueMapping - The value function of the map.

Returns:

A Map containing the ResultSets data.

Throws:

SQLException - In case the ResultSet can't be read.

mapToSet

public Set<E> mapToSet(ResultSet set) throws SQLException

Maps a ResultSet to a Set.

Specified by:

mapToSet in interface Mappable<E extends BaseEntity>

Parameters:

set - The ResultSet to get the data from.

Returns:

A Set containing the ResultSets data.

Throws:

SQLException - In case the ResultSet can't be read.