Package org.springframework.batch.item.adapter

Class ItemReaderAdapter<T>

java.lang.Object

org.springframework.batch.item.adapter.AbstractMethodInvokingDelegator<T>

org.springframework.batch.item.adapter.ItemReaderAdapter<T>

All Implemented Interfaces:

ItemReader<T>, org.springframework.beans.factory.InitializingBean

public class ItemReaderAdapter<T>
extends AbstractMethodInvokingDelegator<T>
implements ItemReader<T>

Invokes a custom method on a delegate plain old Java object which itself provides an item.

This adapter is thread-safe as long as the delegate ItemReader is thread-safe.

Author:

Robert Kasanicky

Nested Class Summary

Nested classes/interfaces inherited from class org.springframework.batch.item.adapter.AbstractMethodInvokingDelegator

AbstractMethodInvokingDelegator.InvocationTargetThrowableWrapper

Constructor Summary

Constructors

Constructor	Description
ItemReaderAdapter()

Method Summary

Modifier and Type	Method	Description
T	read()	Reads a piece of input data and advance to the next one.

Methods inherited from class org.springframework.batch.item.adapter.AbstractMethodInvokingDelegator

afterPropertiesSet, getArguments, getTargetMethod, getTargetObject, invokeDelegateMethod, invokeDelegateMethodWithArgument, invokeDelegateMethodWithArguments, setArguments, setTargetMethod, setTargetObject

Methods inherited from class java.lang.Object

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

Constructor Details

ItemReaderAdapter

public ItemReaderAdapter()

Method Details

read

@Nullable
public T read()
       throws Exception

Description copied from interface: ItemReader

Reads a piece of input data and advance to the next one. Implementations must return null at the end of the input data set. In a transactional setting, caller might get the same item twice from successive calls (or otherwise), if the first call was in a transaction that rolled back.

Specified by:

read in interface ItemReader<T>

Returns:

return value of the target method.

Throws:

ParseException - if there is a problem parsing the current record (but the next one may still be valid)

NonTransientResourceException - if there is a fatal exception in the underlying resource. After throwing this exception implementations should endeavour to return null from subsequent calls to read.

UnexpectedInputException - if there is an uncategorised problem with the input data. Assume potentially transient, so subsequent calls to read might succeed.

Exception - if an there is a non-specific error.