org.apache.commons.collections
public interface Transformer
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: 155406 $ $Date: 2005-02-26 12:55:26 +0000 (Sat, 26 Feb 2005) $
Method Summary | |
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Object | transform(Object input)
Transforms the input object (leaving it unchanged) into some output object.
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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