Package com.amazonaws.services.dynamodbv2.datamodeling

Class AttributeTransformerChain

java.lang.Object

com.amazonaws.services.dynamodbv2.datamodeling.AttributeTransformerChain

All Implemented Interfaces:

AttributeTransformer

public class AttributeTransformerChain
extends Object
implements AttributeTransformer

A virtual AttributeTransformer that transforms and untransforms attributes by running them through a cascading series of child AttributeTransformer instances.

Nested Class Summary

Nested classes/interfaces inherited from interface com.amazonaws.services.dynamodbv2.datamodeling.AttributeTransformer

AttributeTransformer.Parameters<T>

Constructor Summary

Constructors

Constructor	Description
AttributeTransformerChain(AttributeTransformer... transformers)	Creates a new transformer chain from the given array of transformers.
AttributeTransformerChain(List<AttributeTransformer> transformers)	Creates a new transformer chain from the given list of transformers.

Method Summary

Modifier and Type	Method	Description
List<AttributeTransformer>	getTransformers()
String	toString()
Map<String,AttributeValue>	transform(AttributeTransformer.Parameters<?> parameters)	Transforms the input set of attribute values derived from the model object before writing them into DynamoDB.
Map<String,AttributeValue>	untransform(AttributeTransformer.Parameters<?> parameters)	Untransform the input set of attribute values read from DynamoDB before creating a model object from them.

Methods inherited from class java.lang.Object

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

Constructor Details

AttributeTransformerChain

public AttributeTransformerChain(AttributeTransformer... transformers)

Creates a new transformer chain from the given array of transformers. When transforming attributes, these transformers are invoked from first to last; when untransforming they are invoked in the opposite order.

Parameters:

transformers - the chain of transformers.

AttributeTransformerChain

public AttributeTransformerChain(List<AttributeTransformer> transformers)

Creates a new transformer chain from the given list of transformers. When transforming attributes, these transformers are invoked from first to last; when untransforming they are invoked in the opposite order.

Parameters:

transformers - the chain of transformers.

Method Details

getTransformers

public List<AttributeTransformer> getTransformers()

Returns:

the transformers in this chain

transform

public Map<String,AttributeValue> transform(AttributeTransformer.Parameters<?> parameters)

Description copied from interface: AttributeTransformer

Transforms the input set of attribute values derived from the model object before writing them into DynamoDB.

Specified by:

transform in interface AttributeTransformer

Parameters:

parameters - transformation parameters

Returns:

the transformed attribute value map

untransform

public Map<String,AttributeValue> untransform(AttributeTransformer.Parameters<?> parameters)

Description copied from interface: AttributeTransformer

Untransform the input set of attribute values read from DynamoDB before creating a model object from them.

Specified by:

untransform in interface AttributeTransformer

Parameters:

parameters - transformation parameters

Returns:

the untransformed attribute value map

toString

public String toString()

Overrides:

toString in class Object