jAgg A Java API that supports group by operations object lists
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aggregation aggregate

jAgg Description

Java Aggregation Operations 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 allows such "super aggregate" operations as rollups and cubes. It also allows custom aggregate operations. That is, one can create custom Aggregators to work with jAgg. Features: * Ability to apply "group by" functionality to an arbitrary List of Objects * Specify "group by" properties by making List items Comparable or by supplying a list of property names, like a SQL "group by" * 20 built-in aggregators, including Sum, Count, Avg, Max, and Min * Custom aggregator support * Parallel processing * Multiset Discrimination as an alternative to sorting, to gather items with identical properties prior to aggregation * Super aggregate feature includes ability to create rollups and cubes

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