Package org.jdbi.v3.core.mapper

Class GenericMapMapperFactory

java.lang.Object

org.jdbi.v3.core.mapper.GenericMapMapperFactory

All Implemented Interfaces:

RowMapperFactory

@Beta
public class GenericMapMapperFactory
extends java.lang.Object
implements RowMapperFactory

Factory for a RowMapper that can map resultset rows to column name/generic value Maps. Each row in the resultset becomes a distinct Map, in which the keys are all distinct column names and the values are the corresponding cell contents. All values are mapped to the same generic type T (e.g. BigDecimal) by a ColumnMapper from the ConfigRegistry. This differs from MapMapper by supporting a concrete type instead of only Object, and from collecting into a Map in that the latter maps an entire resultset to a single Map and can only keep 1 key and 1 value from each row. Use cases for this are mainly single-row results like numeric reports (e.g. the price components, taxes, etc of a product for sale, or a set of possible labeled values for a user setting), and matrices.

See Also:

ResultBearing.mapToMap(GenericType), MapMapper, ResultBearing.mapToMap(), ResultBearing.collectInto(GenericType)

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	GenericMapMapperFactory.GenericMapMapper<T>

Constructor Summary

Constructors

Constructor	Description
GenericMapMapperFactory()

Method Summary

Modifier and Type	Method	Description
java.util.Optional<RowMapper<?>>	build(java.lang.reflect.Type mapType, ConfigRegistry config)	Supplies a row mapper which will map result set rows to type if the factory supports it; empty otherwise.
static <T> RowMapper<java.util.Map<java.lang.String,T>>	getMapperForValueType(java.lang.Class<T> valueType, ConfigRegistry config)
static <T> RowMapper<java.util.Map<java.lang.String,T>>	getMapperForValueType(GenericType<T> valueType, ConfigRegistry config)

Methods inherited from class java.lang.Object

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

Constructor Detail

GenericMapMapperFactory

public GenericMapMapperFactory()

Method Detail

build

public java.util.Optional<RowMapper<?>> build(java.lang.reflect.Type mapType,
                                              ConfigRegistry config)

Description copied from interface: RowMapperFactory

Supplies a row mapper which will map result set rows to type if the factory supports it; empty otherwise.

Specified by:

build in interface RowMapperFactory

Parameters:

mapType - the target type to map to

config - the config registry, for composition

Returns:

a row mapper for the given type if this factory supports it; Optional.empty() otherwise.

See Also:

for composition

getMapperForValueType

@Beta
public static <T> RowMapper<java.util.Map<java.lang.String,T>> getMapperForValueType(java.lang.Class<T> valueType,
                                                                                           ConfigRegistry config)

getMapperForValueType

@Beta
public static <T> RowMapper<java.util.Map<java.lang.String,T>> getMapperForValueType(GenericType<T> valueType,
                                                                                           ConfigRegistry config)