Transformer (Commons Collections 3.2.2 API)

All Known Implementing Classes:

ChainedTransformer, CloneTransformer, ClosureTransformer, ConstantTransformer, ExceptionTransformer, FactoryTransformer, InstantiateTransformer, InvokerTransformer, MapTransformer, NOPTransformer, PredicateTransformer, StringValueTransformer, SwitchTransformer
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public interface 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 invokation, returning a constant, cloning and returning the string value.

Since:

Commons Collections 1.0

Version:

$Revision: 646777 $ $Date: 2008-04-10 14:33:15 +0200 (Thu, 10 Apr 2008) $

Author:

James Strachan, Stephen Colebourne

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Object`	`transform(Object input)`	Transforms the input object (leaving it unchanged) into some output object.

- Method Detail
  - transform
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Object transform(Object input)
```
    Transforms the input object (leaving it unchanged) into some output object.
    
    Parameters:
    
    input - the object to be transformed, should be left unchanged
    
    Returns:
    
    a transformed object
    
    Throws:
    
    ClassCastException - (runtime) if the input is the wrong class
    
    IllegalArgumentException - (runtime) if the input is invalid
    
    FunctorException - (runtime) if the transform cannot be completed