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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.msd;

/**
 * A NumberDiscriminator discriminates Lists of
 * Numbers.
 *
 * @author Randy Gettman
 * @since 0.5.0
 */
public abstract class NumberDiscriminator extends PortionDiscriminator
{
   /**
    * Numbers will be discriminated this number of bits at a time.
    */
   public static final int PORTION_BITS = 16;
   /**
    * This is the mask used to extract a portion of a number.
    */
   public static final int PORTION_MASK = (1 << PORTION_BITS) - 1;

   /**
    * Returns an appropriate Extractor.
    * @param extractor An Extractor that returns appropriate
    *    labels.
    * @return An appropriate Extractor.
    */
   protected abstract  PortionExtractor getPortionExtractor(Extractor extractor);
}