Package org.springframework.batch.item.file.transform

Class PassThroughFieldExtractor<T>

  • All Implemented Interfaces:
    FieldExtractor<T>
    public class PassThroughFieldExtractor<T>
extends java.lang.Object
implements FieldExtractor<T>
    FieldExtractor that just returns the original item. If the item is an array or collection it will be returned as is, otherwise it is wrapped in a single element array.
    Author:
    Dave Syer

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and TypeMethodDescription
      java.lang.Object[]extract​(T item)
      Get an array of fields as close as possible to the input.

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • PassThroughFieldExtractor

        public PassThroughFieldExtractor()

    • Method Detail

      • extract

        public java.lang.Object[] extract​(T item)
        Get an array of fields as close as possible to the input. The result depends on the type of the input:
        • A FieldSet or array will be returned as is
        • For a Collection the toArray() method will be used
        • For a Map the values() will be returned as an array
        • Otherwise it is wrapped in a single element array.
        Note that no attempt is made to sort the values, so passing in an unordered collection or map is probably a bad idea. Spring often gives you an ordered Map (e.g. if extracting data from a generic query using JDBC), so check the documentation for whatever is being used to generate the input.
        Specified by:
        extract in interface FieldExtractor<T>
        Parameters:
        item - the object to convert
        Returns:
        an array of objects as close as possible to the original item