org.springframework.batch.item

Interface ItemProcessor<I,O>

Type Parameters:

I - type of input item

O - type of output item

All Known Implementing Classes:

AsyncItemProcessor, BeanValidatingItemProcessor, ClassifierCompositeItemProcessor, CompositeItemProcessor, FunctionItemProcessor, ItemProcessorAdapter, ItemProcessorAdapter, PassThroughItemProcessor, ScriptItemProcessor, ValidatingItemProcessor

public interface ItemProcessor<I,O>

Interface for item transformation. Given an item as input, this interface provides an extension point which allows for the application of business logic in an item oriented processing scenario. It should be noted that while it's possible to return a different type than the one provided, it's not strictly necessary. Furthermore, returning null indicates that the item should not be continued to be processed.

Author:

Robert Kasanicky, Dave Syer, Mahmoud Ben Hassine

Method Summary

Modifier and Type	Method and Description
O	process(I item) Process the provided item, returning a potentially modified or new item for continued processing.

Method Detail

process

@Nullable
O process(@NonNull
                    I item)
             throws java.lang.Exception

Process the provided item, returning a potentially modified or new item for continued processing. If the returned result is null, it is assumed that processing of the item should not continue. A null item will never reach this method because the only possible sources are:

• an ItemReader (which indicates no more items)
• a previous ItemProcessor in a composite processor (which indicates a filtered item)

Parameters:

item - to be processed, never null.

Returns:

potentially modified or new item for continued processing, null if processing of the provided item should not continue.

Throws:

java.lang.Exception - thrown if exception occurs during processing.