Apache Commons Collections 4.4 · org.apache.commons.collections4.Transformer

Defines a functor interface implemented by classes that transform one object into another.

A Transformer converts the input object to the output object. The input object should be left unchanged. Transformers are typically used for type conversions, or extracting data from an object.

Standard implementations of common transformers are provided by TransformerUtils. These include method invocation, returning a constant, cloning and returning the string value.

Method Summary

Modifier and Type	Method and Description
public O	Returns: a transformed object transform(I the object to be transformed, should be left unchanged input) Transforms the input object (leaving it unchanged) into some output object.

Method Detail

transform	back to summary
public O transform(I input) Transforms the input object (leaving it unchanged) into some output object. Parameters input:I the object to be transformed, should be left unchanged Returns:O a transformed object Exceptions ClassCastException: (runtime) if the input is the wrong class IllegalArgumentException: (runtime) if the input is invalid FunctorException: (runtime) if the transform cannot be completed

transform

back to summary

public O transform(I input)

Transforms the input object (leaving it unchanged) into some output object.

Parameters

input:I: the object to be transformed, should be left unchanged

Returns:O

a transformed object

Exceptions

ClassCastException:: (runtime) if the input is the wrong class
IllegalArgumentException:: (runtime) if the input is invalid
FunctorException:: (runtime) if the transform cannot be completed

public Interface Transformer<I, O>

Method Summary

Method Detail