org.apache.beam.sdk.io.aws2.schemas

Class AwsSchemaProvider

java.lang.Object

org.apache.beam.sdk.schemas.GetterBasedSchemaProvider

org.apache.beam.sdk.io.aws2.schemas.AwsSchemaProvider

All Implemented Interfaces:

java.io.Serializable, SchemaProvider

public class AwsSchemaProvider
extends GetterBasedSchemaProvider

Schema provider for AWS SdkPojo models using the provided field metadata (@see SdkPojo.sdkFields()) rather than reflection.

Note: Beam doesn't support self-referential schemas. Some AWS models are not compatible with schemas for that reason and require a dedicated coder, such as DynamoDB AttributeValue (coder).

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
AwsSchemaProvider()

Method Summary

Modifier and Type	Method and Description
java.util.List<FieldValueGetter>	fieldValueGetters(java.lang.Class<?> clazz, Schema schema) Implementing class should override to return FieldValueGetters.
java.util.List<FieldValueTypeInformation>	fieldValueTypeInformations(java.lang.Class<?> cls, Schema schema) Implementing class should override to return a list of type-informations.
<T> SerializableFunction<Row,T>	fromRowFunction(TypeDescriptor<T> type) Given a type, returns a function that converts from a Row object to that type.
<T> @Nullable Schema	schemaFor(TypeDescriptor<T> type) Lookup a schema for the given type.
SchemaUserTypeCreator	schemaTypeCreator(java.lang.Class<?> cls, Schema schema) Implementing class should override to return a constructor.

Methods inherited from class org.apache.beam.sdk.schemas.GetterBasedSchemaProvider

equals, hashCode, toRowFunction

Methods inherited from class java.lang.Object

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

Constructor Detail

AwsSchemaProvider

public AwsSchemaProvider()

Method Detail

schemaFor

public <T> @Nullable Schema schemaFor(TypeDescriptor<T> type)

Description copied from interface: SchemaProvider

Lookup a schema for the given type. If no schema exists, returns null.

fieldValueGetters

public java.util.List<FieldValueGetter> fieldValueGetters(java.lang.Class<?> clazz,
                                                          Schema schema)

Description copied from class: GetterBasedSchemaProvider

Implementing class should override to return FieldValueGetters.

Specified by:

fieldValueGetters in class GetterBasedSchemaProvider

fromRowFunction

public <T> SerializableFunction<Row,T> fromRowFunction(TypeDescriptor<T> type)

Description copied from interface: SchemaProvider

Given a type, returns a function that converts from a Row object to that type. If no schema exists, returns null.

Specified by:

fromRowFunction in interface SchemaProvider

Overrides:

fromRowFunction in class GetterBasedSchemaProvider

fieldValueTypeInformations

public java.util.List<FieldValueTypeInformation> fieldValueTypeInformations(java.lang.Class<?> cls,
                                                                            Schema schema)

Description copied from class: GetterBasedSchemaProvider

Implementing class should override to return a list of type-informations.

Specified by:

fieldValueTypeInformations in class GetterBasedSchemaProvider

schemaTypeCreator

public SchemaUserTypeCreator schemaTypeCreator(java.lang.Class<?> cls,
                                               Schema schema)

Description copied from class: GetterBasedSchemaProvider

Implementing class should override to return a constructor.

Specified by:

schemaTypeCreator in class GetterBasedSchemaProvider