Alessandro Colantonio
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CONCISECOmpressed 'NComposable Integer SEt


Bit arrays, or bitmaps, are used to significantly speed up set operations in several areas, such as data warehousing, information retrieval, and data mining, to cite a few. However, bitmaps usually use a large storage space, thus requiring compression. Here we offer a Java implementation of CONCISE (COmpressed 'N' Composable Integer SEt), a bitmap compression algorithm that, when compared to classical compression schemes, trades some space to allow for fast bitwise operations without first decompressing bitmaps. CONCISE can be efficiently used to manipulate sets of integral numbers in lieu of well-known data structures such as arrays, lists, hashtables, and self-balancing binary search trees. Click Linkhere for more details about CONCISE.

Java Implementation

The most up-to-date Java code is available at the LinkSourceForge website. Among the classes contained within the package, the most important are:

A description for the remaining classes can be found Linkhere.



If you have any question/bug report/suggestion, please send me an email at:
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Other Info

To verify the performance of current CONCISE implementation, I adopted a very powerful profiler called YourKit. YourKit is kindly supporting open source projects with its full-featured Java Profiler. YourKit, LLC is the creator of innovative and intelligent tools for profiling Java and .NET applications. Take a look at YourKit's leading software products: YourKit Java Profiler and YourKit .NET Profiler.
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Last update: 2011-05-18