org.springframework.batch.item.file.transform
Class RecursiveCollectionItemTransformer

java.lang.Object
  org.springframework.batch.item.file.transform.RecursiveCollectionItemTransformer

All Implemented Interfaces:

ItemTransformer

public class RecursiveCollectionItemTransformer
extends Object
implements ItemTransformer

An implementation of ItemTransformer that treats its argument specially if it is an array or collection. In this case it loops though, calling itself on each member in turn, until it encounters a non collection. At this point, if the item is a String, that is used, or else it is passed to the delegate ItemTransformer. The transformed single item Strings are all concatenated with line separators.

Author:

Dave Syer

Constructor Summary

RecursiveCollectionItemTransformer()

Method Summary

void	setDelegate(ItemTransformer delegate) Public setter for the ItemTransformer to use on single items, that are not Strings.
String	stringify(Object item)
Object	transform(Object input)

Methods inherited from class java.lang.Object

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

Constructor Detail

RecursiveCollectionItemTransformer

public RecursiveCollectionItemTransformer()

Method Detail

setDelegate

public void setDelegate(ItemTransformer delegate)

Public setter for the ItemTransformer to use on single items, that are not Strings. This can be used to strategise the conversion of collection and array elements to a String, e.g. via a subclass of LineAggregatorItemTransformer.
N.B. if the delegate returns an array or collection, it will not be treated the same way as the original item passed in for transformation. Rather, in this case, it will simply be converted immediately to a String by calling its toString().

Parameters:

delegate - the delegate to set. Defaults to a pass through.

transform

public Object transform(Object input)
                 throws Exception

Specified by:

transform in interface ItemTransformer

Throws:

Exception

stringify

public String stringify(Object item)
                 throws Exception

Throws:

Exception