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<h2 title="Class RetouchedBloomFilter" class="title">Class RetouchedBloomFilter</h2>
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<li>org.apache.hadoop.util.bloom.Filter</li>
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<li><a href="../../../../../org/apache/hadoop/util/bloom/BloomFilter.html" title="class in org.apache.hadoop.util.bloom">org.apache.hadoop.util.bloom.BloomFilter</a></li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</a>, <a href="../../../../../org/apache/hadoop/util/bloom/RemoveScheme.html" title="interface in org.apache.hadoop.util.bloom">RemoveScheme</a></dd>
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<pre>@InterfaceAudience.Public
@InterfaceStability.Stable
public final class <span class="typeNameLabel">RetouchedBloomFilter</span>
extends <a href="../../../../../org/apache/hadoop/util/bloom/BloomFilter.html" title="class in org.apache.hadoop.util.bloom">BloomFilter</a>
implements <a href="../../../../../org/apache/hadoop/util/bloom/RemoveScheme.html" title="interface in org.apache.hadoop.util.bloom">RemoveScheme</a></pre>
<div class="block">Implements a <i>retouched Bloom filter</i>, as defined in the CoNEXT 2006 paper.
<p>
It allows the removal of selected false positives at the cost of introducing
random false negatives, and with the benefit of eliminating some random false
positives at the same time.
<p>
Originally created by
<a href="http://www.one-lab.org">European Commission One-Lab Project 034819</a>.</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><code>The general behavior of a filter</code>,
<a href="../../../../../org/apache/hadoop/util/bloom/BloomFilter.html" title="class in org.apache.hadoop.util.bloom"><code>A Bloom filter</code></a>,
<a href="../../../../../org/apache/hadoop/util/bloom/RemoveScheme.html" title="interface in org.apache.hadoop.util.bloom"><code>The different selective clearing algorithms</code></a>,
<a href="http://www-rp.lip6.fr/site_npa/site_rp/_publications/740-rbf_cameraready.pdf">Retouched Bloom Filters: Allowing Networked Applications to Trade Off Selected False Positives Against False Negatives</a></dd>
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<h3>Fields inherited from class&nbsp;org.apache.hadoop.util.bloom.Filter</h3>
<code>hash, hashType, nbHash, vectorSize</code></li>
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<code><a href="../../../../../org/apache/hadoop/util/bloom/RemoveScheme.html#MAXIMUM_FP">MAXIMUM_FP</a>, <a href="../../../../../org/apache/hadoop/util/bloom/RemoveScheme.html#MINIMUM_FN">MINIMUM_FN</a>, <a href="../../../../../org/apache/hadoop/util/bloom/RemoveScheme.html#RANDOM">RANDOM</a>, <a href="../../../../../org/apache/hadoop/util/bloom/RemoveScheme.html#RATIO">RATIO</a></code></li>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/util/bloom/RetouchedBloomFilter.html#RetouchedBloomFilter--">RetouchedBloomFilter</a></span>()</code>
<div class="block">Default constructor - use with readFields</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/util/bloom/RetouchedBloomFilter.html#RetouchedBloomFilter-int-int-int-">RetouchedBloomFilter</a></span>(int&nbsp;vectorSize,
int&nbsp;nbHash,
int&nbsp;hashType)</code>
<div class="block">Constructor</div>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/util/bloom/RetouchedBloomFilter.html#add-org.apache.hadoop.util.bloom.Key-">add</a></span>(org.apache.hadoop.util.bloom.Key&nbsp;key)</code>
<div class="block">Adds a key to <i>this</i> filter.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/util/bloom/RetouchedBloomFilter.html#addFalsePositive-java.util.Collection-">addFalsePositive</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;org.apache.hadoop.util.bloom.Key&gt;&nbsp;coll)</code>
<div class="block">Adds a collection of false positive information to <i>this</i> retouched Bloom filter.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/util/bloom/RetouchedBloomFilter.html#addFalsePositive-org.apache.hadoop.util.bloom.Key-">addFalsePositive</a></span>(org.apache.hadoop.util.bloom.Key&nbsp;key)</code>
<div class="block">Adds a false positive information to <i>this</i> retouched Bloom filter.</div>
</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/util/bloom/RetouchedBloomFilter.html#addFalsePositive-org.apache.hadoop.util.bloom.Key:A-">addFalsePositive</a></span>(org.apache.hadoop.util.bloom.Key[]&nbsp;keys)</code>
<div class="block">Adds an array of false positive information to <i>this</i> retouched Bloom filter.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/util/bloom/RetouchedBloomFilter.html#addFalsePositive-java.util.List-">addFalsePositive</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;org.apache.hadoop.util.bloom.Key&gt;&nbsp;keys)</code>
<div class="block">Adds a list of false positive information to <i>this</i> retouched Bloom filter.</div>
</td>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/util/bloom/RetouchedBloomFilter.html#readFields-java.io.DataInput-">readFields</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</a>&nbsp;in)</code>
<div class="block">Deserialize the fields of this object from <code>in</code>.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/util/bloom/RetouchedBloomFilter.html#selectiveClearing-org.apache.hadoop.util.bloom.Key-short-">selectiveClearing</a></span>(org.apache.hadoop.util.bloom.Key&nbsp;k,
short&nbsp;scheme)</code>
<div class="block">Performs the selective clearing for a given key.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/util/bloom/RetouchedBloomFilter.html#write-java.io.DataOutput-">write</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</a>&nbsp;out)</code>
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<code><a href="../../../../../org/apache/hadoop/util/bloom/BloomFilter.html#and-org.apache.hadoop.util.bloom.Filter-">and</a>, <a href="../../../../../org/apache/hadoop/util/bloom/BloomFilter.html#getVectorSize--">getVectorSize</a>, <a href="../../../../../org/apache/hadoop/util/bloom/BloomFilter.html#membershipTest-org.apache.hadoop.util.bloom.Key-">membershipTest</a>, <a href="../../../../../org/apache/hadoop/util/bloom/BloomFilter.html#not--">not</a>, <a href="../../../../../org/apache/hadoop/util/bloom/BloomFilter.html#or-org.apache.hadoop.util.bloom.Filter-">or</a>, <a href="../../../../../org/apache/hadoop/util/bloom/BloomFilter.html#toString--">toString</a>, <a href="../../../../../org/apache/hadoop/util/bloom/BloomFilter.html#xor-org.apache.hadoop.util.bloom.Filter-">xor</a></code></li>
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<pre>public&nbsp;RetouchedBloomFilter()</pre>
<div class="block">Default constructor - use with readFields</div>
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<pre>public&nbsp;RetouchedBloomFilter(int&nbsp;vectorSize,
int&nbsp;nbHash,
int&nbsp;hashType)</pre>
<div class="block">Constructor</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>vectorSize</code> - The vector size of <i>this</i> filter.</dd>
<dd><code>nbHash</code> - The number of hash function to consider.</dd>
<dd><code>hashType</code> - type of the hashing function (see
<code>Hash</code>).</dd>
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<h4>add</h4>
<pre>public&nbsp;void&nbsp;add(org.apache.hadoop.util.bloom.Key&nbsp;key)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code>org.apache.hadoop.util.bloom.Filter</code></span></div>
<div class="block">Adds a key to <i>this</i> filter.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/util/bloom/BloomFilter.html#add-org.apache.hadoop.util.bloom.Key-">add</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/util/bloom/BloomFilter.html" title="class in org.apache.hadoop.util.bloom">BloomFilter</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>key</code> - The key to add.</dd>
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<h4>addFalsePositive</h4>
<pre>public&nbsp;void&nbsp;addFalsePositive(org.apache.hadoop.util.bloom.Key&nbsp;key)</pre>
<div class="block">Adds a false positive information to <i>this</i> retouched Bloom filter.
<p>
<b>Invariant</b>: if the false positive is <code>null</code>, nothing happens.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>key</code> - The false positive key to add.</dd>
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<pre>public&nbsp;void&nbsp;addFalsePositive(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;org.apache.hadoop.util.bloom.Key&gt;&nbsp;coll)</pre>
<div class="block">Adds a collection of false positive information to <i>this</i> retouched Bloom filter.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>coll</code> - The collection of false positive.</dd>
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<pre>public&nbsp;void&nbsp;addFalsePositive(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;org.apache.hadoop.util.bloom.Key&gt;&nbsp;keys)</pre>
<div class="block">Adds a list of false positive information to <i>this</i> retouched Bloom filter.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>keys</code> - The list of false positive.</dd>
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<pre>public&nbsp;void&nbsp;addFalsePositive(org.apache.hadoop.util.bloom.Key[]&nbsp;keys)</pre>
<div class="block">Adds an array of false positive information to <i>this</i> retouched Bloom filter.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>keys</code> - The array of false positive.</dd>
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<h4>selectiveClearing</h4>
<pre>public&nbsp;void&nbsp;selectiveClearing(org.apache.hadoop.util.bloom.Key&nbsp;k,
short&nbsp;scheme)</pre>
<div class="block">Performs the selective clearing for a given key.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>k</code> - The false positive key to remove from <i>this</i> retouched Bloom filter.</dd>
<dd><code>scheme</code> - The selective clearing scheme to apply.</dd>
</dl>
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<h4>write</h4>
<pre>public&nbsp;void&nbsp;write(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</a>&nbsp;out)
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<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../org/apache/hadoop/io/Writable.html#write-java.io.DataOutput-">Writable</a></code></span></div>
<div class="block">Serialize the fields of this object to <code>out</code>.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/io/Writable.html#write-java.io.DataOutput-">write</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/util/bloom/BloomFilter.html#write-java.io.DataOutput-">write</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/util/bloom/BloomFilter.html" title="class in org.apache.hadoop.util.bloom">BloomFilter</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>out</code> - <code>DataOuput</code> to serialize this object into.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>readFields</h4>
<pre>public&nbsp;void&nbsp;readFields(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</a>&nbsp;in)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../org/apache/hadoop/io/Writable.html#readFields-java.io.DataInput-">Writable</a></code></span></div>
<div class="block">Deserialize the fields of this object from <code>in</code>.
<p>For efficiency, implementations should attempt to re-use storage in the
existing object where possible.</p></div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/io/Writable.html#readFields-java.io.DataInput-">readFields</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/util/bloom/BloomFilter.html#readFields-java.io.DataInput-">readFields</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/util/bloom/BloomFilter.html" title="class in org.apache.hadoop.util.bloom">BloomFilter</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>in</code> - <code>DataInput</code> to deseriablize this object from.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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