io.objectbox.reactive

Interface DataTransformer<FROM,TO>

Type Parameters:

FROM - Data type this transformer receives

TO - Type of transformed data

public interface DataTransformer<FROM,TO>

Transforms or processes data before it is given to subscribed DataObservers. A transformer is set via SubscriptionBuilder.transform(DataTransformer). Note that a transformer is not required to actually "transform" any data. Technically, it's fine to return the same data it received and just do some processing with it. Threading notes: Note that the transformer is always executed asynchronously. It is OK to perform long lasting operations.

Method Summary

Modifier and Type	Method and Description
TO	transform(FROM source) Transforms/processes the given data.

Method Detail

transform

TO transform(FROM source)
      throws java.lang.Exception

Transforms/processes the given data.

Parameters:

source - data to be transformed

Returns:

transformed data

Throws:

java.lang.Exception - Transformers may throw any exceptions, which can be reacted on via SubscriptionBuilder.onError(ErrorObserver).