software.amazon.awssdk.enhanced.dynamodb.internal.converter.attribute

Class OptionalAttributeConverter<T>

java.lang.Object

software.amazon.awssdk.enhanced.dynamodb.internal.converter.attribute.OptionalAttributeConverter<T>

All Implemented Interfaces:

AttributeConverter<Optional<T>>

@ThreadSafe
 @Immutable
public class OptionalAttributeConverter<T>
extends Object
implements AttributeConverter<Optional<T>>

A converter between Optional and EnhancedAttributeValue.

Method Summary

Modifier and Type	Method and Description
AttributeValueType	attributeValueType() The AttributeValueType that a converter stores and reads values from DynamoDB via the AttributeValue class.
static OptionalAttributeConverter	create(AttributeConverter delegate)
AttributeValue	transformFrom(Optional<T> input) Convert the provided Java object into an AttributeValue.
Optional<T>	transformTo(AttributeValue input) Convert the provided AttributeValue into a Java object.
EnhancedType<Optional<T>>	type() The type supported by this converter.

Methods inherited from class java.lang.Object

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

Method Detail

create

public static OptionalAttributeConverter create(AttributeConverter delegate)

type

public EnhancedType<Optional<T>> type()

Description copied from interface: AttributeConverter

The type supported by this converter.

Specified by:

type in interface AttributeConverter<Optional<T>>

attributeValueType

public AttributeValueType attributeValueType()

Description copied from interface: AttributeConverter

The AttributeValueType that a converter stores and reads values from DynamoDB via the AttributeValue class.

Specified by:

attributeValueType in interface AttributeConverter<Optional<T>>

transformFrom

public AttributeValue transformFrom(Optional<T> input)

Description copied from interface: AttributeConverter

Convert the provided Java object into an AttributeValue. This will raise a RuntimeException if the conversion fails, or the input is null.

Example:

 
 InstantAsStringAttributeConverter converter = InstantAsStringAttributeConverter.create();
 assertEquals(converter.transformFrom(Instant.EPOCH),
              EnhancedAttributeValue.fromString("1970-01-01T00:00:00Z").toAttributeValue());
 
 

Specified by:

transformFrom in interface AttributeConverter<Optional<T>>

transformTo

public Optional<T> transformTo(AttributeValue input)

Description copied from interface: AttributeConverter

Convert the provided AttributeValue into a Java object. This will raise a RuntimeException if the conversion fails, or the input is null.

 Example:
 
 InstantAsStringAttributeConverter converter = InstantAsStringAttributeConverter.create();
 assertEquals(converter.transformTo(EnhancedAttributeValue.fromString("1970-01-01T00:00:00Z").toAttributeValue()),
              Instant.EPOCH);
 
 

Specified by:

transformTo in interface AttributeConverter<Optional<T>>