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Download JavaEWAH JAR 1.1.4 with all dependencies


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.

Files of the artifact JavaEWAH version 1.1.4 from the group com.googlecode.javaewah.

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Source code of JavaEWAH version 1.1.4

META-INF
META-INF.META-INF.MANIFEST.MF
com.googlecode.javaewah
com.googlecode.javaewah.com.googlecodeewah.BitCounter
com.googlecode.javaewah.com.googlecodeewah.BitmapStorage
com.googlecode.javaewah.com.googlecodeewah.Buffer
com.googlecode.javaewah.com.googlecodeewah.BufferedIterator
com.googlecode.javaewah.com.googlecodeewah.BufferedRunningLengthWord
com.googlecode.javaewah.com.googlecodeewah.ChunkIterator
com.googlecode.javaewah.com.googlecodeewah.ChunkIteratorImpl
com.googlecode.javaewah.com.googlecodeewah.ClearIntIterator
com.googlecode.javaewah.com.googlecodeewah.CloneableIterator
com.googlecode.javaewah.com.googlecodeewah.EWAHCompressedBitmap
com.googlecode.javaewah.com.googlecodeewah.EWAHIterator
com.googlecode.javaewah.com.googlecodeewah.FastAggregation
com.googlecode.javaewah.com.googlecodeewah.IntIterator
com.googlecode.javaewah.com.googlecodeewah.IntIteratorImpl
com.googlecode.javaewah.com.googlecodeewah.IntIteratorOverIteratingRLW
com.googlecode.javaewah.com.googlecodeewah.IteratingBufferedRunningLengthWord
com.googlecode.javaewah.com.googlecodeewah.IteratingRLW
com.googlecode.javaewah.com.googlecodeewah.IteratorAggregation
com.googlecode.javaewah.com.googlecodeewah.IteratorUtil
com.googlecode.javaewah.com.googlecodeewah.LogicalElement
com.googlecode.javaewah.com.googlecodeewah.LongArray
com.googlecode.javaewah.com.googlecodeewah.LongBufferWrapper
com.googlecode.javaewah.com.googlecodeewah.NonEmptyVirtualStorage
com.googlecode.javaewah.com.googlecodeewah.ReverseEWAHIterator
com.googlecode.javaewah.com.googlecodeewah.ReverseIntIterator
com.googlecode.javaewah.com.googlecodeewah.RunningLengthWord
com.googlecode.javaewah.datastructure
com.googlecode.javaewah.datastructure.com.googlecodeewah.datastructure.BitSet
com.googlecode.javaewah.datastructure.com.googlecodeewah.datastructure.ImmutableBitSet
com.googlecode.javaewah.datastructure.com.googlecodeewah.datastructure.PriorityQ
com.googlecode.javaewah.datastructure.com.googlecodeewah.datastructure.WordArray
com.googlecode.javaewah.symmetric
com.googlecode.javaewah.symmetric.com.googlecodeewah.symmetric.BitmapSymmetricAlgorithm
com.googlecode.javaewah.symmetric.com.googlecodeewah.symmetric.EWAHPointer
com.googlecode.javaewah.symmetric.com.googlecodeewah.symmetric.RunningBitmapMerge
com.googlecode.javaewah.symmetric.com.googlecodeewah.symmetric.ThresholdFuncBitmap
com.googlecode.javaewah.symmetric.com.googlecodeewah.symmetric.UpdateableBitmapFunction
com.googlecode.javaewah32
com.googlecode.javaewah32.com.googlecodeewah32.BitCounter32
com.googlecode.javaewah32.com.googlecodeewah32.BitmapStorage32
com.googlecode.javaewah32.com.googlecodeewah32.Buffer32
com.googlecode.javaewah32.com.googlecodeewah32.BufferedIterator32
com.googlecode.javaewah32.com.googlecodeewah32.BufferedRunningLengthWord32
com.googlecode.javaewah32.com.googlecodeewah32.ChunkIteratorImpl32
com.googlecode.javaewah32.com.googlecodeewah32.ClearIntIterator32
com.googlecode.javaewah32.com.googlecodeewah32.EWAHCompressedBitmap32
com.googlecode.javaewah32.com.googlecodeewah32.EWAHIterator32
com.googlecode.javaewah32.com.googlecodeewah32.FastAggregation32
com.googlecode.javaewah32.com.googlecodeewah32.IntArray
com.googlecode.javaewah32.com.googlecodeewah32.IntBufferWrapper
com.googlecode.javaewah32.com.googlecodeewah32.IntIteratorImpl32
com.googlecode.javaewah32.com.googlecodeewah32.IntIteratorOverIteratingRLW32
com.googlecode.javaewah32.com.googlecodeewah32.IteratingBufferedRunningLengthWord32
com.googlecode.javaewah32.com.googlecodeewah32.IteratingRLW32
com.googlecode.javaewah32.com.googlecodeewah32.IteratorAggregation32
com.googlecode.javaewah32.com.googlecodeewah32.IteratorUtil32
com.googlecode.javaewah32.com.googlecodeewah32.NonEmptyVirtualStorage32
com.googlecode.javaewah32.com.googlecodeewah32.ReverseEWAHIterator32
com.googlecode.javaewah32.com.googlecodeewah32.ReverseIntIterator32
com.googlecode.javaewah32.com.googlecodeewah32.RunningLengthWord32
com.googlecode.javaewah32.symmetric
com.googlecode.javaewah32.symmetric.com.googlecodeewah32.symmetric.BitmapSymmetricAlgorithm32
com.googlecode.javaewah32.symmetric.com.googlecodeewah32.symmetric.EWAHPointer32
com.googlecode.javaewah32.symmetric.com.googlecodeewah32.symmetric.RunningBitmapMerge32
com.googlecode.javaewah32.symmetric.com.googlecodeewah32.symmetric.ThresholdFuncBitmap32
com.googlecode.javaewah32.symmetric.com.googlecodeewah32.symmetric.UpdateableBitmapFunction32




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