Package com.github.collinalpert.java2db.mappers

Class BaseMapper<E extends BaseEntity>

java.lang.Object

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

All Implemented Interfaces:

Mappable<E>

public class BaseMapper<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
BaseMapper(Class<E> clazz)

Method Summary

Modifier and Type	Method	Description
Optional<E>	map(ResultSet set, Map<String,String> aliases)	Maps a ResultSet with a single row to a Java entity.
E[]	mapToArray(ResultSet set, Map<String,String> aliases)	Maps a ResultSet with multiple rows to an array of Java entities.
List<E>	mapToList(ResultSet set, Map<String,String> aliases)	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, Map<String,String> aliases)	Maps a ResultSet to a Map.
Stream<E>	mapToStream(ResultSet set, Map<String,String> aliases)	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

Constructor Detail

BaseMapper

public BaseMapper(Class<E> clazz)

Method Detail

map

public Optional<E> map(ResultSet set,
                       Map<String,String> aliases)
                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.

aliases - A map of column aliases needed to retrieve column data from the ResultSet.

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,
                         Map<String,String> aliases)
                  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.

aliases - A map of column aliases needed to retrieve column data from the ResultSet.

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,
                             Map<String,String> aliases)
                      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.

aliases - A map of column aliases needed to retrieve column data from the ResultSet.

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,
                      Map<String,String> aliases)
               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.

aliases - A map of column aliases needed to retrieve column data from the ResultSet.

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,
                                           Map<String,String> aliases)
                                    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.

aliases - A map of column aliases needed to retrieve column data from the ResultSet.

Returns:

A Map containing the ResultSets data.

Throws:

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