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Types that extend and augment the Java Collections Framework.
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package org.apache.commons.collections;

/**
 * Defines a functor interface implemented by classes that
 * perform a predicate test on an object. Predicate instances can be used
 * to implement queries or to do filtering. 
 * 
 * @since Commons Collections 1.0
 * @version $Revision: 1.9 $ $Date: 2004/01/14 21:43:04 $
 * 
 * @author James Strachan
 * @author Stephen Colebourne
 */
public interface Predicate {
    
    /**
     * Use the specified parameter to perform a test that returns true or false.
     *
     * @param object  the object to evaluate
     * @return true or false
     * @throws ClassCastException (runtime) if the input is the wrong class
     * @throws IllegalArgumentException (runtime) if the input is invalid
     * @throws FunctorException (runtime) if the predicate encounters a problem
     */
    public boolean evaluate(Object object);
    
}