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package org.apache.commons.collections;

/**
 * Defines a functor interface implemented by classes that do something.
 * <p>
 * A Closure represents a block of code which is executed from inside some
 * block, function or iteration. It operates an input object.
 *  
 * @since Commons Collections 1.0
 * @version $Revision: 2094 $ $Date: 2004-01-17 03:55:12 +0900 (Sat, 17 Jan 2004) $
 *
 * @author James Strachan
 * @author Nicola Ken Barozzi
 * @author Stephen Colebourne
 */
public interface Closure {
    
    /**
     * Performs an action on the specified input object.
     *
     * @param input  the input to execute on
     * @throws ClassCastException (runtime) if the input is the wrong class
     * @throws IllegalArgumentException (runtime) if the input is invalid
     * @throws FunctorException (runtime) if any other error occurs
     */
    public void execute(Object input);
    
}
