Download JAR files tagged by javaewah with all dependencies

This OSGi bundle wraps ${pkgArtifactId} ${pkgVersion} jar file.

Alternative compressed bitmap implementations in Java such as JavaEWAH can be a bit overengineered. The goal of this project is to come up with a very simple alternative that has good performance.

The bit array data structure is implemented in Java as the BitSet class. Unfortunately, this fails to scale without compression. JavaEWAH is a word-aligned compressed variant of the Java bitset class. It uses a 64-bit run-length encoding (RLE) compression scheme. The goal of word-aligned compression is not to achieve the best compression, but rather to improve query processing time. Hence, we try to save CPU cycles, maybe at the expense of storage. However, the EWAH scheme we implemented is always more efficient storage-wise than an uncompressed bitmap (implemented in Java as the BitSet class). Unlike some alternatives, javaewah does not rely on a patented scheme.