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<div class="subTitle">com.googlecode.javaewah</div>
<h2 title="Class EWAHCompressedBitmap" class="title">Class EWAHCompressedBitmap</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li>com.googlecode.javaewah.EWAHCompressedBitmap</li>
</ul>
</li>
</ul>
<div class="description">
<ul class="blockList">
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<dl>
<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../com/googlecode/javaewah/BitmapStorage.html" title="interface in com.googlecode.javaewah">BitmapStorage</a>, <a href="../../../com/googlecode/javaewah/LogicalElement.html" title="interface in com.googlecode.javaewah">LogicalElement</a><<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a>>, java.io.Externalizable, java.io.Serializable, java.lang.Cloneable, java.lang.Iterable<java.lang.Integer></dd>
</dl>
<hr>
<br>
<pre>public final class <span class="strong">EWAHCompressedBitmap</span>
extends java.lang.Object
implements java.lang.Cloneable, java.io.Externalizable, java.lang.Iterable<java.lang.Integer>, <a href="../../../com/googlecode/javaewah/BitmapStorage.html" title="interface in com.googlecode.javaewah">BitmapStorage</a>, <a href="../../../com/googlecode/javaewah/LogicalElement.html" title="interface in com.googlecode.javaewah">LogicalElement</a><<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a>></pre>
<div class="block"><p>
This implements the patent-free(1) EWAH scheme. Roughly speaking, it is a
64-bit variant of the BBC compression scheme used by Oracle for its bitmap
indexes.
</p>
<p>
The objective of this compression type is to provide some compression, while
reducing as much as possible the CPU cycle usage.
</p>
<p>
This implementation being 64-bit, it assumes a 64-bit CPU together with a
64-bit Java Virtual Machine. This same code on a 32-bit machine may not be as
fast.
<p>
<p>
There is also a 32-bit version of this code in the class
javaewah32.EWAHCompressedBitmap32
</p></div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>0.1.0</dd>
<dt><span class="strong">See Also:</span></dt><dd><a href="../../../com/googlecode/javaewah32/EWAHCompressedBitmap32.html" title="class in com.googlecode.javaewah32"><code><p>
For more details, see the following paper:
</p>
<ul>
<li>Daniel Lemire, Owen Kaser, Kamel Aouiche, Sorting improves
word-aligned bitmap indexes. Data & Knowledge Engineering 69 (1), pages
3-28, 2010. http://arxiv.org/abs/0901.3751</li>
</ul>
<p>
A 32-bit version of the compressed format was described by Wu et al. and
named WBC:
</p>
<ul>
<li>K. Wu, E. J. Otoo, A. Shoshani, H. Nordberg, Notes on design and
implementation of compressed bit vectors, Tech. Rep. LBNL/PUB-3161,
Lawrence Berkeley National Laboratory, available from http://crd.lbl.
gov/~kewu/ps/PUB-3161.html (2001).</li>
</ul>
<p>
Probably, the best prior art is the Oracle bitmap compression scheme
(BBC):
</p>
<ul>
<li>G. Antoshenkov, Byte-Aligned Bitmap Compression, DCC'95, 1995.</li>
</ul>
<p>
1- The authors do not know of any patent infringed by the following
implementation. However, similar schemes, like WAH are covered by
patents.
</p></code></a>,
<a href="../../../serialized-form.html#com.googlecode.javaewah.EWAHCompressedBitmap">Serialized Form</a></dd></dl>
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<caption><span>Fields</span><span class="tabEnd"> </span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#usetrailingzeros">usetrailingzeros</a></strong></code>
<div class="block">optimization option</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#wordinbits">wordinbits</a></strong></code>
<div class="block">The Constant wordinbits represents the number of bits in a long.</div>
</td>
</tr>
</table>
</li>
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<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#EWAHCompressedBitmap()">EWAHCompressedBitmap</a></strong>()</code>
<div class="block">Creates an empty bitmap (no bit set to true).</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#EWAHCompressedBitmap(int)">EWAHCompressedBitmap</a></strong>(int buffersize)</code>
<div class="block">Sets explicitly the buffer size (in 64-bit words).</div>
</td>
</tr>
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</li>
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<caption><span>Methods</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#add(long)">add</a></strong>(long newdata)</code>
<div class="block">Adding words directly to the bitmap (for expert use).</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#add(long, int)">add</a></strong>(long newdata,
int bitsthatmatter)</code>
<div class="block">Adding words directly to the bitmap (for expert use).</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#addStreamOfEmptyWords(boolean, long)">addStreamOfEmptyWords</a></strong>(boolean v,
long number)</code>
<div class="block">For experts: You want to add many zeroes or ones? This is the method you
use.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#addStreamOfLiteralWords(long[], int, int)">addStreamOfLiteralWords</a></strong>(long[] data,
int start,
int number)</code>
<div class="block">if you have several literal words to copy over, this might be faster.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#addStreamOfNegatedLiteralWords(long[], int, int)">addStreamOfNegatedLiteralWords</a></strong>(long[] data,
int start,
int number)</code>
<div class="block">Same as addStreamOfLiteralWords, but the words are negated.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static <a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a></code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#and(com.googlecode.javaewah.EWAHCompressedBitmap...)">and</a></strong>(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a>... bitmaps)</code>
<div class="block">Returns a new compressed bitmap containing the bitwise AND values of the
provided bitmaps.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a></code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#and(com.googlecode.javaewah.EWAHCompressedBitmap)">and</a></strong>(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> a)</code>
<div class="block">Returns a new compressed bitmap containing the bitwise AND values of the
current bitmap with some other bitmap.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#andCardinality(com.googlecode.javaewah.EWAHCompressedBitmap...)">andCardinality</a></strong>(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a>... bitmaps)</code>
<div class="block">Returns the cardinality of the result of a bitwise AND of the values of the
provided bitmaps.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#andCardinality(com.googlecode.javaewah.EWAHCompressedBitmap)">andCardinality</a></strong>(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> a)</code>
<div class="block">Returns the cardinality of the result of a bitwise AND of the values of the
current bitmap with some other bitmap.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a></code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#andNot(com.googlecode.javaewah.EWAHCompressedBitmap)">andNot</a></strong>(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> a)</code>
<div class="block">Returns a new compressed bitmap containing the bitwise AND NOT values of
the current bitmap with some other bitmap.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#andNotCardinality(com.googlecode.javaewah.EWAHCompressedBitmap)">andNotCardinality</a></strong>(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> a)</code>
<div class="block">Returns the cardinality of the result of a bitwise AND NOT of the values of
the current bitmap with some other bitmap.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#andNotToContainer(com.googlecode.javaewah.EWAHCompressedBitmap, com.googlecode.javaewah.BitmapStorage)">andNotToContainer</a></strong>(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> a,
<a href="../../../com/googlecode/javaewah/BitmapStorage.html" title="interface in com.googlecode.javaewah">BitmapStorage</a> container)</code>
<div class="block">Returns a new compressed bitmap containing the bitwise AND NOT values of
the current bitmap with some other bitmap.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#andToContainer(com.googlecode.javaewah.EWAHCompressedBitmap, com.googlecode.javaewah.BitmapStorage)">andToContainer</a></strong>(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> a,
<a href="../../../com/googlecode/javaewah/BitmapStorage.html" title="interface in com.googlecode.javaewah">BitmapStorage</a> container)</code>
<div class="block">Computes new compressed bitmap containing the bitwise AND values of the
current bitmap with some other bitmap.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#andWithContainer(com.googlecode.javaewah.BitmapStorage, com.googlecode.javaewah.EWAHCompressedBitmap...)">andWithContainer</a></strong>(<a href="../../../com/googlecode/javaewah/BitmapStorage.html" title="interface in com.googlecode.javaewah">BitmapStorage</a> container,
<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a>... bitmaps)</code>
<div class="block">For internal use.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static <a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a></code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#bitmapOf(int...)">bitmapOf</a></strong>(int... setbits)</code>
<div class="block">Return a bitmap with the bit set to true at the given
positions.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#cardinality()">cardinality</a></strong>()</code>
<div class="block">reports the number of bits set to true.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#clear()">clear</a></strong>()</code>
<div class="block">Clear any set bits and set size in bits back to 0</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#clone()">clone</a></strong>()</code> </td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#deserialize(java.io.DataInput)">deserialize</a></strong>(java.io.DataInput in)</code>
<div class="block">Deserialize.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#equals(java.lang.Object)">equals</a></strong>(java.lang.Object o)</code>
<div class="block">Check to see whether the two compressed bitmaps contain the same set bits.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../com/googlecode/javaewah/EWAHIterator.html" title="class in com.googlecode.javaewah">EWAHIterator</a></code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#getEWAHIterator()">getEWAHIterator</a></strong>()</code>
<div class="block">Gets an EWAHIterator over the data.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.util.List<java.lang.Integer></code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#getPositions()">getPositions</a></strong>()</code>
<div class="block">get the locations of the true values as one vector.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#hashCode()">hashCode</a></strong>()</code>
<div class="block">Returns a customized hash code (based on Karp-Rabin).</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#intersects(com.googlecode.javaewah.EWAHCompressedBitmap)">intersects</a></strong>(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> a)</code>
<div class="block">Return true if the two EWAHCompressedBitmap have both at least one true bit
in the same position.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../com/googlecode/javaewah/IntIterator.html" title="interface in com.googlecode.javaewah">IntIterator</a></code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#intIterator()">intIterator</a></strong>()</code>
<div class="block">Iterator over the set bits (this is what most people will want to use to
browse the content if they want an iterator).</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.util.Iterator<java.lang.Integer></code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#iterator()">iterator</a></strong>()</code>
<div class="block">iterate over the positions of the true values.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#not()">not</a></strong>()</code>
<div class="block">Negate (bitwise) the current bitmap.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static <a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a></code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#or(com.googlecode.javaewah.EWAHCompressedBitmap...)">or</a></strong>(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a>... bitmaps)</code>
<div class="block">Returns a new compressed bitmap containing the bitwise OR values of the
provided bitmaps.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a></code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#or(com.googlecode.javaewah.EWAHCompressedBitmap)">or</a></strong>(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> a)</code>
<div class="block">Returns a new compressed bitmap containing the bitwise OR values of the
current bitmap with some other bitmap.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#orCardinality(com.googlecode.javaewah.EWAHCompressedBitmap...)">orCardinality</a></strong>(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a>... bitmaps)</code>
<div class="block">Returns the cardinality of the result of a bitwise OR of the values of the
provided bitmaps.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#orCardinality(com.googlecode.javaewah.EWAHCompressedBitmap)">orCardinality</a></strong>(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> a)</code>
<div class="block">Returns the cardinality of the result of a bitwise OR of the values of the
current bitmap with some other bitmap.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#orToContainer(com.googlecode.javaewah.EWAHCompressedBitmap, com.googlecode.javaewah.BitmapStorage)">orToContainer</a></strong>(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> a,
<a href="../../../com/googlecode/javaewah/BitmapStorage.html" title="interface in com.googlecode.javaewah">BitmapStorage</a> container)</code>
<div class="block">Computes the bitwise or between the current bitmap and the bitmap "a".</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#orWithContainer(com.googlecode.javaewah.BitmapStorage, com.googlecode.javaewah.EWAHCompressedBitmap...)">orWithContainer</a></strong>(<a href="../../../com/googlecode/javaewah/BitmapStorage.html" title="interface in com.googlecode.javaewah">BitmapStorage</a> container,
<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a>... bitmaps)</code>
<div class="block">For internal use.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#readExternal(java.io.ObjectInput)">readExternal</a></strong>(java.io.ObjectInput in)</code> </td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#serialize(java.io.DataOutput)">serialize</a></strong>(java.io.DataOutput out)</code>
<div class="block">Serialize.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#serializedSizeInBytes()">serializedSizeInBytes</a></strong>()</code>
<div class="block">Report the size required to serialize this bitmap</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#set(int)">set</a></strong>(int i)</code>
<div class="block">set the bit at position i to true, the bits must be set in increasing
order.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#setSizeInBits(int)">setSizeInBits</a></strong>(int size)</code>
<div class="block">set the size in bits</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#setSizeInBits(int, boolean)">setSizeInBits</a></strong>(int size,
boolean defaultvalue)</code>
<div class="block">Change the reported size in bits of the *uncompressed* bitmap represented
by this compressed bitmap.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#sizeInBits()">sizeInBits</a></strong>()</code>
<div class="block">Returns the size in bits of the *uncompressed* bitmap represented by this
compressed bitmap.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#sizeInBytes()">sizeInBytes</a></strong>()</code>
<div class="block">Report the *compressed* size of the bitmap (equivalent to memory usage,
after accounting for some overhead).</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int[]</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#toArray()">toArray</a></strong>()</code>
<div class="block">Populate an array of (sorted integers) corresponding to the location of the
set bits.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#toDebugString()">toDebugString</a></strong>()</code>
<div class="block">A more detailed string describing the bitmap (useful for debugging).</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#toString()">toString</a></strong>()</code>
<div class="block">A string describing the bitmap.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#writeExternal(java.io.ObjectOutput)">writeExternal</a></strong>(java.io.ObjectOutput out)</code> </td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a></code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#xor(com.googlecode.javaewah.EWAHCompressedBitmap)">xor</a></strong>(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> a)</code>
<div class="block">Returns a new compressed bitmap containing the bitwise XOR values of the
current bitmap with some other bitmap.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#xorCardinality(com.googlecode.javaewah.EWAHCompressedBitmap)">xorCardinality</a></strong>(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> a)</code>
<div class="block">Returns the cardinality of the result of a bitwise XOR of the values of the
current bitmap with some other bitmap.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html#xorToContainer(com.googlecode.javaewah.EWAHCompressedBitmap, com.googlecode.javaewah.BitmapStorage)">xorToContainer</a></strong>(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> a,
<a href="../../../com/googlecode/javaewah/BitmapStorage.html" title="interface in com.googlecode.javaewah">BitmapStorage</a> container)</code>
<div class="block">Computes a new compressed bitmap containing the bitwise XOR values of the
current bitmap with some other bitmap.</div>
</td>
</tr>
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<h3>Methods inherited from class java.lang.Object</h3>
<code>finalize, getClass, notify, notifyAll, wait, wait, wait</code></li>
</ul>
</li>
</ul>
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</ul>
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<h3>Field Detail</h3>
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<h4>usetrailingzeros</h4>
<pre>public static final boolean usetrailingzeros</pre>
<div class="block">optimization option</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../constant-values.html#com.googlecode.javaewah.EWAHCompressedBitmap.usetrailingzeros">Constant Field Values</a></dd></dl>
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<h4>wordinbits</h4>
<pre>public static final int wordinbits</pre>
<div class="block">The Constant wordinbits represents the number of bits in a long.</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../constant-values.html#com.googlecode.javaewah.EWAHCompressedBitmap.wordinbits">Constant Field Values</a></dd></dl>
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<h3>Constructor Detail</h3>
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<h4>EWAHCompressedBitmap</h4>
<pre>public EWAHCompressedBitmap()</pre>
<div class="block">Creates an empty bitmap (no bit set to true).</div>
</li>
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<h4>EWAHCompressedBitmap</h4>
<pre>public EWAHCompressedBitmap(int buffersize)</pre>
<div class="block">Sets explicitly the buffer size (in 64-bit words). The initial memory usage
will be "buffersize * 64". For large poorly compressible bitmaps, using
large values may improve performance.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>buffersize</code> - number of 64-bit words reserved when the object is created)</dd></dl>
</li>
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<h3>Method Detail</h3>
<a name="add(long)">
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<h4>add</h4>
<pre>public void add(long newdata)</pre>
<div class="block">Adding words directly to the bitmap (for expert use).
This is normally how you add data to the array. So you add bits in streams
of 8*8 bits.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../com/googlecode/javaewah/BitmapStorage.html#add(long)">add</a></code> in interface <code><a href="../../../com/googlecode/javaewah/BitmapStorage.html" title="interface in com.googlecode.javaewah">BitmapStorage</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>newdata</code> - the word</dd></dl>
</li>
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<h4>add</h4>
<pre>public void add(long newdata,
int bitsthatmatter)</pre>
<div class="block">Adding words directly to the bitmap (for expert use).</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>newdata</code> - the word</dd><dd><code>bitsthatmatter</code> - the number of significant bits (by default it should be 64)</dd></dl>
</li>
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<a name="addStreamOfLiteralWords(long[], int, int)">
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<h4>addStreamOfLiteralWords</h4>
<pre>public void addStreamOfLiteralWords(long[] data,
int start,
int number)</pre>
<div class="block">if you have several literal words to copy over, this might be faster.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../com/googlecode/javaewah/BitmapStorage.html#addStreamOfLiteralWords(long[], int, int)">addStreamOfLiteralWords</a></code> in interface <code><a href="../../../com/googlecode/javaewah/BitmapStorage.html" title="interface in com.googlecode.javaewah">BitmapStorage</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>data</code> - the literal words</dd><dd><code>start</code> - the starting point in the array</dd><dd><code>number</code> - the number of literal words to add</dd></dl>
</li>
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<h4>addStreamOfEmptyWords</h4>
<pre>public void addStreamOfEmptyWords(boolean v,
long number)</pre>
<div class="block">For experts: You want to add many zeroes or ones? This is the method you
use.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../com/googlecode/javaewah/BitmapStorage.html#addStreamOfEmptyWords(boolean, long)">addStreamOfEmptyWords</a></code> in interface <code><a href="../../../com/googlecode/javaewah/BitmapStorage.html" title="interface in com.googlecode.javaewah">BitmapStorage</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>v</code> - the boolean value</dd><dd><code>number</code> - the number</dd></dl>
</li>
</ul>
<a name="addStreamOfNegatedLiteralWords(long[], int, int)">
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<h4>addStreamOfNegatedLiteralWords</h4>
<pre>public void addStreamOfNegatedLiteralWords(long[] data,
int start,
int number)</pre>
<div class="block">Same as addStreamOfLiteralWords, but the words are negated.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../com/googlecode/javaewah/BitmapStorage.html#addStreamOfNegatedLiteralWords(long[], int, int)">addStreamOfNegatedLiteralWords</a></code> in interface <code><a href="../../../com/googlecode/javaewah/BitmapStorage.html" title="interface in com.googlecode.javaewah">BitmapStorage</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>data</code> - the literal words</dd><dd><code>start</code> - the starting point in the array</dd><dd><code>number</code> - the number of literal words to add</dd></dl>
</li>
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<h4>and</h4>
<pre>public <a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> and(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> a)</pre>
<div class="block">Returns a new compressed bitmap containing the bitwise AND values of the
current bitmap with some other bitmap.
The running time is proportional to the sum of the compressed sizes (as
reported by sizeInBytes()).</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../com/googlecode/javaewah/LogicalElement.html#and(T)">and</a></code> in interface <code><a href="../../../com/googlecode/javaewah/LogicalElement.html" title="interface in com.googlecode.javaewah">LogicalElement</a><<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a>></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>a</code> - the other bitmap</dd>
<dt><span class="strong">Returns:</span></dt><dd>the EWAH compressed bitmap</dd><dt><span class="strong">Since:</span></dt>
<dd>0.4.3</dd></dl>
</li>
</ul>
<a name="andToContainer(com.googlecode.javaewah.EWAHCompressedBitmap, com.googlecode.javaewah.BitmapStorage)">
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<h4>andToContainer</h4>
<pre>public void andToContainer(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> a,
<a href="../../../com/googlecode/javaewah/BitmapStorage.html" title="interface in com.googlecode.javaewah">BitmapStorage</a> container)</pre>
<div class="block">Computes new compressed bitmap containing the bitwise AND values of the
current bitmap with some other bitmap.
The running time is proportional to the sum of the compressed sizes (as
reported by sizeInBytes()).</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>a</code> - the other bitmap</dd><dd><code>container</code> - where we store the result</dd><dt><span class="strong">Since:</span></dt>
<dd>0.4.0</dd></dl>
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</ul>
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<h4>andCardinality</h4>
<pre>public int andCardinality(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> a)</pre>
<div class="block">Returns the cardinality of the result of a bitwise AND of the values of the
current bitmap with some other bitmap. Avoids needing to allocate an
intermediate bitmap to hold the result of the OR.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>a</code> - the other bitmap</dd>
<dt><span class="strong">Returns:</span></dt><dd>the cardinality</dd><dt><span class="strong">Since:</span></dt>
<dd>0.4.0</dd></dl>
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<h4>andNot</h4>
<pre>public <a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> andNot(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> a)</pre>
<div class="block">Returns a new compressed bitmap containing the bitwise AND NOT values of
the current bitmap with some other bitmap.
The running time is proportional to the sum of the compressed sizes (as
reported by sizeInBytes()).</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../com/googlecode/javaewah/LogicalElement.html#andNot(T)">andNot</a></code> in interface <code><a href="../../../com/googlecode/javaewah/LogicalElement.html" title="interface in com.googlecode.javaewah">LogicalElement</a><<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a>></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>a</code> - the other bitmap</dd>
<dt><span class="strong">Returns:</span></dt><dd>the EWAH compressed bitmap</dd></dl>
</li>
</ul>
<a name="andNotToContainer(com.googlecode.javaewah.EWAHCompressedBitmap, com.googlecode.javaewah.BitmapStorage)">
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<h4>andNotToContainer</h4>
<pre>public void andNotToContainer(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> a,
<a href="../../../com/googlecode/javaewah/BitmapStorage.html" title="interface in com.googlecode.javaewah">BitmapStorage</a> container)</pre>
<div class="block">Returns a new compressed bitmap containing the bitwise AND NOT values of
the current bitmap with some other bitmap. This method is expected to
be faster than doing A.and(((EWAHCompressedBitmap) B.clone()).not()).
The running time is proportional to the sum of the compressed sizes (as
reported by sizeInBytes()).</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>a</code> - the other bitmap</dd><dt><span class="strong">Since:</span></dt>
<dd>0.4.0</dd></dl>
</li>
</ul>
<a name="andNotCardinality(com.googlecode.javaewah.EWAHCompressedBitmap)">
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<h4>andNotCardinality</h4>
<pre>public int andNotCardinality(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> a)</pre>
<div class="block">Returns the cardinality of the result of a bitwise AND NOT of the values of
the current bitmap with some other bitmap. Avoids needing to allocate an
intermediate bitmap to hold the result of the OR.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>a</code> - the other bitmap</dd>
<dt><span class="strong">Returns:</span></dt><dd>the cardinality</dd><dt><span class="strong">Since:</span></dt>
<dd>0.4.0</dd></dl>
</li>
</ul>
<a name="cardinality()">
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<h4>cardinality</h4>
<pre>public int cardinality()</pre>
<div class="block">reports the number of bits set to true. Running time is proportional to
compressed size (as reported by sizeInBytes).</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the number of bits set to true</dd></dl>
</li>
</ul>
<a name="clear()">
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</a>
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<h4>clear</h4>
<pre>public void clear()</pre>
<div class="block">Clear any set bits and set size in bits back to 0</div>
</li>
</ul>
<a name="clone()">
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<ul class="blockList">
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<h4>clone</h4>
<pre>public java.lang.Object clone()
throws java.lang.CloneNotSupportedException</pre>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code>clone</code> in class <code>java.lang.Object</code></dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.CloneNotSupportedException</code></dd></dl>
</li>
</ul>
<a name="deserialize(java.io.DataInput)">
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</a>
<ul class="blockList">
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<h4>deserialize</h4>
<pre>public void deserialize(java.io.DataInput in)
throws java.io.IOException</pre>
<div class="block">Deserialize.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>in</code> - the DataInput stream</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.io.IOException</code> - Signals that an I/O exception has occurred.</dd></dl>
</li>
</ul>
<a name="equals(java.lang.Object)">
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</a>
<ul class="blockList">
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<h4>equals</h4>
<pre>public boolean equals(java.lang.Object o)</pre>
<div class="block">Check to see whether the two compressed bitmaps contain the same set bits.</div>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code>equals</code> in class <code>java.lang.Object</code></dd>
<dt><span class="strong">See Also:</span></dt><dd><code>Object.equals(java.lang.Object)</code></dd></dl>
</li>
</ul>
<a name="getEWAHIterator()">
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</a>
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<h4>getEWAHIterator</h4>
<pre>public <a href="../../../com/googlecode/javaewah/EWAHIterator.html" title="class in com.googlecode.javaewah">EWAHIterator</a> getEWAHIterator()</pre>
<div class="block">Gets an EWAHIterator over the data. This is a customized iterator which
iterates over run length word. For experts only.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the EWAHIterator</dd></dl>
</li>
</ul>
<a name="getPositions()">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>getPositions</h4>
<pre>public java.util.List<java.lang.Integer> getPositions()</pre>
<div class="block">get the locations of the true values as one vector. (may use more memory
than iterator())</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the positions</dd></dl>
</li>
</ul>
<a name="hashCode()">
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</a>
<ul class="blockList">
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<h4>hashCode</h4>
<pre>public int hashCode()</pre>
<div class="block">Returns a customized hash code (based on Karp-Rabin). Naturally, if the
bitmaps are equal, they will hash to the same value.</div>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code>hashCode</code> in class <code>java.lang.Object</code></dd>
</dl>
</li>
</ul>
<a name="intersects(com.googlecode.javaewah.EWAHCompressedBitmap)">
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<h4>intersects</h4>
<pre>public boolean intersects(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> a)</pre>
<div class="block">Return true if the two EWAHCompressedBitmap have both at least one true bit
in the same position. Equivalently, you could call "and" and check whether
there is a set bit, but intersects will run faster if you don't need the
result of the "and" operation.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>a</code> - the other bitmap</dd>
<dt><span class="strong">Returns:</span></dt><dd>whether they intersect</dd><dt><span class="strong">Since:</span></dt>
<dd>0.3.2</dd></dl>
</li>
</ul>
<a name="intIterator()">
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<h4>intIterator</h4>
<pre>public <a href="../../../com/googlecode/javaewah/IntIterator.html" title="interface in com.googlecode.javaewah">IntIterator</a> intIterator()</pre>
<div class="block">Iterator over the set bits (this is what most people will want to use to
browse the content if they want an iterator). The location of the set bits
is returned, in increasing order.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the int iterator</dd></dl>
</li>
</ul>
<a name="iterator()">
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</a>
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<h4>iterator</h4>
<pre>public java.util.Iterator<java.lang.Integer> iterator()</pre>
<div class="block">iterate over the positions of the true values. This is similar to
intIterator(), but it uses Java generics.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>iterator</code> in interface <code>java.lang.Iterable<java.lang.Integer></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>the iterator</dd></dl>
</li>
</ul>
<a name="not()">
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<h4>not</h4>
<pre>public void not()</pre>
<div class="block">Negate (bitwise) the current bitmap. To get a negated copy, do
EWAHCompressedBitmap x= ((EWAHCompressedBitmap) mybitmap.clone()); x.not();
The running time is proportional to the compressed size (as reported by
sizeInBytes()).</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../com/googlecode/javaewah/LogicalElement.html#not()">not</a></code> in interface <code><a href="../../../com/googlecode/javaewah/LogicalElement.html" title="interface in com.googlecode.javaewah">LogicalElement</a><<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a>></code></dd>
</dl>
</li>
</ul>
<a name="or(com.googlecode.javaewah.EWAHCompressedBitmap)">
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<h4>or</h4>
<pre>public <a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> or(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> a)</pre>
<div class="block">Returns a new compressed bitmap containing the bitwise OR values of the
current bitmap with some other bitmap.
The running time is proportional to the sum of the compressed sizes (as
reported by sizeInBytes()).</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../com/googlecode/javaewah/LogicalElement.html#or(T)">or</a></code> in interface <code><a href="../../../com/googlecode/javaewah/LogicalElement.html" title="interface in com.googlecode.javaewah">LogicalElement</a><<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a>></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>a</code> - the other bitmap</dd>
<dt><span class="strong">Returns:</span></dt><dd>the EWAH compressed bitmap</dd></dl>
</li>
</ul>
<a name="orToContainer(com.googlecode.javaewah.EWAHCompressedBitmap, com.googlecode.javaewah.BitmapStorage)">
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<h4>orToContainer</h4>
<pre>public void orToContainer(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> a,
<a href="../../../com/googlecode/javaewah/BitmapStorage.html" title="interface in com.googlecode.javaewah">BitmapStorage</a> container)</pre>
<div class="block">Computes the bitwise or between the current bitmap and the bitmap "a".
Stores the result in the container.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>a</code> - the other bitmap</dd><dd><code>container</code> - where we store the result</dd><dt><span class="strong">Since:</span></dt>
<dd>0.4.0</dd></dl>
</li>
</ul>
<a name="orCardinality(com.googlecode.javaewah.EWAHCompressedBitmap)">
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<h4>orCardinality</h4>
<pre>public int orCardinality(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> a)</pre>
<div class="block">Returns the cardinality of the result of a bitwise OR of the values of the
current bitmap with some other bitmap. Avoids needing to allocate an
intermediate bitmap to hold the result of the OR.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>a</code> - the other bitmap</dd>
<dt><span class="strong">Returns:</span></dt><dd>the cardinality</dd><dt><span class="strong">Since:</span></dt>
<dd>0.4.0</dd></dl>
</li>
</ul>
<a name="readExternal(java.io.ObjectInput)">
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</a>
<ul class="blockList">
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<h4>readExternal</h4>
<pre>public void readExternal(java.io.ObjectInput in)
throws java.io.IOException</pre>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>readExternal</code> in interface <code>java.io.Externalizable</code></dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.io.IOException</code></dd></dl>
</li>
</ul>
<a name="serialize(java.io.DataOutput)">
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</a>
<ul class="blockList">
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<h4>serialize</h4>
<pre>public void serialize(java.io.DataOutput out)
throws java.io.IOException</pre>
<div class="block">Serialize.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>out</code> - the DataOutput stream</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.io.IOException</code> - Signals that an I/O exception has occurred.</dd></dl>
</li>
</ul>
<a name="serializedSizeInBytes()">
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<h4>serializedSizeInBytes</h4>
<pre>public int serializedSizeInBytes()</pre>
<div class="block">Report the size required to serialize this bitmap</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the size in bytes</dd></dl>
</li>
</ul>
<a name="set(int)">
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<h4>set</h4>
<pre>public boolean set(int i)</pre>
<div class="block">set the bit at position i to true, the bits must be set in increasing
order. For example, set(15) and then set(7) will fail. You must do set(7)
and then set(15).</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>i</code> - the index</dd>
<dt><span class="strong">Returns:</span></dt><dd>true if the value was set (always true when i>= sizeInBits()).</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.IndexOutOfBoundsException</code> - if i is negative or greater than Integer.MAX_VALUE - 64</dd></dl>
</li>
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<a name="setSizeInBits(int)">
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<h4>setSizeInBits</h4>
<pre>public void setSizeInBits(int size)</pre>
<div class="block">set the size in bits</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../com/googlecode/javaewah/BitmapStorage.html#setSizeInBits(int)">setSizeInBits</a></code> in interface <code><a href="../../../com/googlecode/javaewah/BitmapStorage.html" title="interface in com.googlecode.javaewah">BitmapStorage</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>size</code> - number of bits</dd><dt><span class="strong">Since:</span></dt>
<dd>0.4.0</dd></dl>
</li>
</ul>
<a name="setSizeInBits(int, boolean)">
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<ul class="blockList">
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<h4>setSizeInBits</h4>
<pre>public boolean setSizeInBits(int size,
boolean defaultvalue)</pre>
<div class="block">Change the reported size in bits of the *uncompressed* bitmap represented
by this compressed bitmap. It is not possible to reduce the sizeInBits, but
it can be extended. The new bits are set to false or true depending on the
value of defaultvalue.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>size</code> - the size in bits</dd><dd><code>defaultvalue</code> - the default boolean value</dd>
<dt><span class="strong">Returns:</span></dt><dd>true if the update was possible</dd></dl>
</li>
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<a name="sizeInBits()">
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<h4>sizeInBits</h4>
<pre>public int sizeInBits()</pre>
<div class="block">Returns the size in bits of the *uncompressed* bitmap represented by this
compressed bitmap. Initially, the sizeInBits is zero. It is extended
automatically when you set bits to true.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../com/googlecode/javaewah/LogicalElement.html#sizeInBits()">sizeInBits</a></code> in interface <code><a href="../../../com/googlecode/javaewah/LogicalElement.html" title="interface in com.googlecode.javaewah">LogicalElement</a><<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a>></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>the size in bits</dd></dl>
</li>
</ul>
<a name="sizeInBytes()">
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</a>
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<h4>sizeInBytes</h4>
<pre>public int sizeInBytes()</pre>
<div class="block">Report the *compressed* size of the bitmap (equivalent to memory usage,
after accounting for some overhead).</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../com/googlecode/javaewah/LogicalElement.html#sizeInBytes()">sizeInBytes</a></code> in interface <code><a href="../../../com/googlecode/javaewah/LogicalElement.html" title="interface in com.googlecode.javaewah">LogicalElement</a><<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a>></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>the size in bytes</dd></dl>
</li>
</ul>
<a name="toArray()">
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<ul class="blockList">
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<h4>toArray</h4>
<pre>public int[] toArray()</pre>
<div class="block">Populate an array of (sorted integers) corresponding to the location of the
set bits.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the array containing the location of the set bits</dd></dl>
</li>
</ul>
<a name="toDebugString()">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>toDebugString</h4>
<pre>public java.lang.String toDebugString()</pre>
<div class="block">A more detailed string describing the bitmap (useful for debugging).</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the string</dd></dl>
</li>
</ul>
<a name="toString()">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>toString</h4>
<pre>public java.lang.String toString()</pre>
<div class="block">A string describing the bitmap.</div>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code>toString</code> in class <code>java.lang.Object</code></dd>
<dt><span class="strong">Returns:</span></dt><dd>the string</dd></dl>
</li>
</ul>
<a name="writeExternal(java.io.ObjectOutput)">
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</a>
<ul class="blockList">
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<h4>writeExternal</h4>
<pre>public void writeExternal(java.io.ObjectOutput out)
throws java.io.IOException</pre>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>writeExternal</code> in interface <code>java.io.Externalizable</code></dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.io.IOException</code></dd></dl>
</li>
</ul>
<a name="xor(com.googlecode.javaewah.EWAHCompressedBitmap)">
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</a>
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<h4>xor</h4>
<pre>public <a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> xor(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> a)</pre>
<div class="block">Returns a new compressed bitmap containing the bitwise XOR values of the
current bitmap with some other bitmap.
The running time is proportional to the sum of the compressed sizes (as
reported by sizeInBytes()).</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../com/googlecode/javaewah/LogicalElement.html#xor(T)">xor</a></code> in interface <code><a href="../../../com/googlecode/javaewah/LogicalElement.html" title="interface in com.googlecode.javaewah">LogicalElement</a><<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a>></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>a</code> - the other bitmap</dd>
<dt><span class="strong">Returns:</span></dt><dd>the EWAH compressed bitmap</dd></dl>
</li>
</ul>
<a name="xorToContainer(com.googlecode.javaewah.EWAHCompressedBitmap, com.googlecode.javaewah.BitmapStorage)">
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<h4>xorToContainer</h4>
<pre>public void xorToContainer(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> a,
<a href="../../../com/googlecode/javaewah/BitmapStorage.html" title="interface in com.googlecode.javaewah">BitmapStorage</a> container)</pre>
<div class="block">Computes a new compressed bitmap containing the bitwise XOR values of the
current bitmap with some other bitmap.
The running time is proportional to the sum of the compressed sizes (as
reported by sizeInBytes()).</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>a</code> - the other bitmap</dd><dd><code>container</code> - where we store the result</dd><dt><span class="strong">Since:</span></dt>
<dd>0.4.0</dd></dl>
</li>
</ul>
<a name="xorCardinality(com.googlecode.javaewah.EWAHCompressedBitmap)">
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<h4>xorCardinality</h4>
<pre>public int xorCardinality(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> a)</pre>
<div class="block">Returns the cardinality of the result of a bitwise XOR of the values of the
current bitmap with some other bitmap. Avoids needing to allocate an
intermediate bitmap to hold the result of the OR.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>a</code> - the other bitmap</dd>
<dt><span class="strong">Returns:</span></dt><dd>the cardinality</dd><dt><span class="strong">Since:</span></dt>
<dd>0.4.0</dd></dl>
</li>
</ul>
<a name="andWithContainer(com.googlecode.javaewah.BitmapStorage, com.googlecode.javaewah.EWAHCompressedBitmap...)">
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<h4>andWithContainer</h4>
<pre>public static void andWithContainer(<a href="../../../com/googlecode/javaewah/BitmapStorage.html" title="interface in com.googlecode.javaewah">BitmapStorage</a> container,
<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a>... bitmaps)</pre>
<div class="block">For internal use. Computes the bitwise and of the provided bitmaps and
stores the result in the container.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>container</code> - where the result is stored</dd><dd><code>bitmaps</code> - bitmaps to AND</dd><dt><span class="strong">Since:</span></dt>
<dd>0.4.3</dd></dl>
</li>
</ul>
<a name="and(com.googlecode.javaewah.EWAHCompressedBitmap...)">
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<h4>and</h4>
<pre>public static <a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> and(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a>... bitmaps)</pre>
<div class="block">Returns a new compressed bitmap containing the bitwise AND values of the
provided bitmaps.
It may or may not be faster than doing the aggregation two-by-two (A.and(B).and(C)).</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>bitmaps</code> - bitmaps to AND together</dd>
<dt><span class="strong">Returns:</span></dt><dd>result of the AND</dd><dt><span class="strong">Since:</span></dt>
<dd>0.4.3</dd></dl>
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<h4>andCardinality</h4>
<pre>public static int andCardinality(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a>... bitmaps)</pre>
<div class="block">Returns the cardinality of the result of a bitwise AND of the values of the
provided bitmaps. Avoids needing to allocate an intermediate bitmap to hold
the result of the AND.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>bitmaps</code> - bitmaps to AND</dd>
<dt><span class="strong">Returns:</span></dt><dd>the cardinality</dd><dt><span class="strong">Since:</span></dt>
<dd>0.4.3</dd></dl>
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<h4>bitmapOf</h4>
<pre>public static <a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> bitmapOf(int... setbits)</pre>
<div class="block">Return a bitmap with the bit set to true at the given
positions. The positions should be given in sorted order.
(This is a convenience method.)</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>setbits</code> - list of set bit positions</dd>
<dt><span class="strong">Returns:</span></dt><dd>the bitmap</dd><dt><span class="strong">Since:</span></dt>
<dd>0.4.5</dd></dl>
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<h4>orWithContainer</h4>
<pre>public static void orWithContainer(<a href="../../../com/googlecode/javaewah/BitmapStorage.html" title="interface in com.googlecode.javaewah">BitmapStorage</a> container,
<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a>... bitmaps)</pre>
<div class="block">For internal use. Computes the bitwise or of the provided bitmaps and
stores the result in the container.</div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>0.4.0</dd></dl>
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<h4>or</h4>
<pre>public static <a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a> or(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a>... bitmaps)</pre>
<div class="block">Returns a new compressed bitmap containing the bitwise OR values of the
provided bitmaps. This is typically faster than doing the aggregation
two-by-two (A.or(B).or(C).or(D)).</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>bitmaps</code> - bitmaps to OR together</dd>
<dt><span class="strong">Returns:</span></dt><dd>result of the OR</dd><dt><span class="strong">Since:</span></dt>
<dd>0.4.0</dd></dl>
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<h4>orCardinality</h4>
<pre>public static int orCardinality(<a href="../../../com/googlecode/javaewah/EWAHCompressedBitmap.html" title="class in com.googlecode.javaewah">EWAHCompressedBitmap</a>... bitmaps)</pre>
<div class="block">Returns the cardinality of the result of a bitwise OR of the values of the
provided bitmaps. Avoids needing to allocate an intermediate bitmap to hold
the result of the OR.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>bitmaps</code> - bitmaps to OR</dd>
<dt><span class="strong">Returns:</span></dt><dd>the cardinality</dd><dt><span class="strong">Since:</span></dt>
<dd>0.4.0</dd></dl>
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