Module io.helidon.dbclient

Package io.helidon.dbclient

Class DbColumnBase

java.lang.Object

io.helidon.dbclient.DbColumnBase

All Implemented Interfaces:

Value<Object>, DbColumn

public abstract class DbColumnBase
extends Object
implements DbColumn

Base DbColumn implementation.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	DbColumnBase(Object value, MapperManager mapperManager, String... mappingQualifiers)	Create a new instance.

Method Summary

Modifier and Type	Method	Description
<N> Value<N>	as(io.helidon.common.GenericType<N> type)
<N> Value<N>	as(Class<N> type)
<N> Value<N>	as(Function<? super Object,? extends N> mapper)
Value<Boolean>	asBoolean()
Value<Double>	asDouble()
Value<Integer>	asInt()
Value<Long>	asLong()
Optional<Object>	asOptional()
Value<String>	asString()
<T> T	get(io.helidon.common.GenericType<T> type)	Value of this column as a generic type.
<T> T	get(Class<T> type)	Typed value of this column.
protected <SRC, T> T	map(SRC value, io.helidon.common.GenericType<T> type)	Map value to target type using Mapper.
protected <SRC, T> T	map(SRC value, Class<T> type)	Map value to target type using Mapper.
protected Object	rawValue()	Get raw value of the database column.

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.helidon.dbclient.DbColumn

dbType, get, javaType, name, precision, scale

Methods inherited from interface io.helidon.common.mapper.Value

filter, flatMap, getBoolean, getDouble, getInt, getLong, getString, stream

Constructor Details

DbColumnBase

protected DbColumnBase(Object value,
 MapperManager mapperManager,
 String... mappingQualifiers)

Create a new instance.

Parameters:

value - value

mapperManager - mapper manager

mappingQualifiers - mapping qualifiers

Method Details

rawValue

protected Object rawValue()

Get raw value of the database column.

Returns:

raw value of the column

get

public <T> T get(Class<T> type)
          throws MapperException

Description copied from interface: DbColumn

Typed value of this column. This method can return a correct result only if the type is the same as DbColumn.javaType() or there is a Mapper registered that can map it.

Specified by:

get in interface DbColumn

Specified by:

get in interface Value<Object>

Type Parameters:

T - type of the returned value

Parameters:

type - class of the type that should be returned (must be supported by the underlying data type)

Returns:

value of this column correctly typed

Throws:

MapperException - in case the type is not the underlying DbColumn.javaType() and there is no mapper registered for it

get

public <T> T get(io.helidon.common.GenericType<T> type)
          throws MapperException

Description copied from interface: DbColumn

Value of this column as a generic type. This method can return a correct result only if the type represents a class, or if there is a Mapper registered that can map underlying DbColumn.javaType() to the type requested.

Specified by:

get in interface DbColumn

Specified by:

get in interface Value<Object>

Type Parameters:

T - type of the returned value

Parameters:

type - requested type

Returns:

value mapped to the expected type if possible

Throws:

MapperException - in case the mapping cannot be done

as

public <N> Value<N> as(Class<N> type)
                throws MapperException

Specified by:

as in interface Value<Object>

Throws:

MapperException

as

public <N> Value<N> as(io.helidon.common.GenericType<N> type)
                throws MapperException

Specified by:

as in interface Value<Object>

Throws:

MapperException

as

public <N> Value<N> as(Function<? super Object,? extends N> mapper)

Specified by:

as in interface Value<Object>

asOptional

public Optional<Object> asOptional()
                            throws MapperException

Specified by:

asOptional in interface Value<Object>

Throws:

MapperException

asBoolean

public Value<Boolean> asBoolean()

Specified by:

asBoolean in interface Value<Object>

asString

public Value<String> asString()

Specified by:

asString in interface Value<Object>

asInt

public Value<Integer> asInt()

Specified by:

asInt in interface Value<Object>

asLong

public Value<Long> asLong()

Specified by:

asLong in interface Value<Object>

asDouble

public Value<Double> asDouble()

Specified by:

asDouble in interface Value<Object>

map

protected <SRC,
T> T map(SRC value,
 io.helidon.common.GenericType<T> type)

Map value to target type using Mapper.

Type Parameters:

SRC - type of the source value

T - type of the target value

Parameters:

value - source value

type - target type

Returns:

result of the mapping

Throws:

MapperException - in case the mapper was not found or failed

map

protected <SRC,
T> T map(SRC value,
 Class<T> type)

Map value to target type using Mapper. String.valueOf(Object) is used as fallback option when Mapper fails.

Type Parameters:

SRC - type of the source value

T - type of the target value

Parameters:

value - source value

type - target type

Returns:

result of the mapping