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jAgg is a Java 5.0 API that supports “group by” operations on Lists of Java objects: aggregate operations such as count, sum, max, min, avg, and many more. It also allows custom aggregate operations.

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package net.sf.jagg.util;

import net.sf.jagg.AnalyticAggregator;

/**
 * This subclasses FunctionCache with a type argument of
 * AnalyticAggregator.
 *
 * @author Randy Gettman
 * @since 0.9.0
 */
public class AnalyticCache extends FunctionCache
{
   /**
    * Returns the archetype itself, if it's not already in use, or a copy.
    * @param archetype An archetype to either use or copy.
    * @return The archetype itself, if it's not already in use, or a copy.
    */
   protected AnalyticAggregator replicate(AnalyticAggregator archetype)
   {
      return archetype.replicate();
   }
}