org.springframework.batch.item.adapter
Class ItemReaderAdapter

java.lang.Object
  org.springframework.batch.item.adapter.AbstractMethodInvokingDelegator
      org.springframework.batch.item.adapter.ItemReaderAdapter

All Implemented Interfaces:

ItemReader, InitializingBean

public class ItemReaderAdapter
extends AbstractMethodInvokingDelegator
implements ItemReader

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

Author:

Robert Kasanicky

Constructor Summary

ItemReaderAdapter()

Method Summary

void	mark() No-op.
Object	read() Reads a piece of input data and advance to the next one.
void	reset() No-op.

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

afterPropertiesSet, 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 Detail

ItemReaderAdapter

public ItemReaderAdapter()

Method Detail

read

public Object 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

Returns:

return value of the target method.

Throws:

Exception - if an underlying resource is unavailable.

mark

public void mark()
          throws MarkFailedException

No-op.

Specified by:

mark in interface ItemReader

Throws:

MarkFailedException - if there is a problem with the mark. If a mark fails inside a transaction, it would be worrying, but not normally fatal.

reset

public void reset()
           throws ResetFailedException

No-op.

Specified by:

reset in interface ItemReader

Throws:

ResetFailedException - if there is a problem with the reset. If a reset fails inside a transaction, it would normally be fatal, and would leave the stream in an inconsistent state. So while this is an unchecked exception, it may be important for a client to catch it explicitly.