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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.

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package com.googlecode.javaewah.datastructure;

interface WordArray {
	/**
	 * Get the total number of words contained in this data structure.
	 * @return the number
	 */
	int getNumberOfWords();
	/**
	 * Get the word at the given index
	 * @param index the index
	 * @return the word
	 */
	long getWord(int index);

}