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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">opennlp.tools.stemmer</a></div>
<h2 title="Class PorterStemmer" class="title">Class PorterStemmer</h2>
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<li>opennlp.tools.stemmer.PorterStemmer</li>
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<dt>All Implemented Interfaces:</dt>
<dd><code><a href="Stemmer.html" title="interface in opennlp.tools.stemmer">Stemmer</a></code></dd>
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<pre>public class <span class="typeNameLabel">PorterStemmer</span>
extends <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a>
implements <a href="Stemmer.html" title="interface in opennlp.tools.stemmer">Stemmer</a></pre>
<div class="block">Stemmer, implementing the Porter Stemming Algorithm
The Stemmer class transforms a word into its root form. The input
word can be provided a character at time (by calling add()), or at once
by calling one of the various stem(something) methods.</div>
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<th class="colFirst" scope="col">Constructor</th>
<th class="colLast" scope="col">Description</th>
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<tr class="altColor">
<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">PorterStemmer</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#add(char)">add</a></span>&#8203;(char&nbsp;ch)</code></th>
<td class="colLast">
<div class="block">Add a character to the word being stemmed.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>char[]</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getResultBuffer()">getResultBuffer</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns a reference to a character buffer containing the results of
the stemming process.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getResultLength()">getResultLength</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the length of the word resulting from the stemming process.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#reset()">reset</a></span>()</code></th>
<td class="colLast">
<div class="block">reset() resets the stemmer so it can stem another word.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#stem()">stem</a></span>()</code></th>
<td class="colLast">
<div class="block">Stem the word placed into the Stemmer buffer through calls to add().</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#stem(char%5B%5D)">stem</a></span>&#8203;(char[]&nbsp;word)</code></th>
<td class="colLast">
<div class="block">Stem a word contained in a char[].</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#stem(char%5B%5D,int)">stem</a></span>&#8203;(char[]&nbsp;word,
int&nbsp;wordLen)</code></th>
<td class="colLast">
<div class="block">Stem a word contained in a leading portion of a char[] array.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#stem(char%5B%5D,int,int)">stem</a></span>&#8203;(char[]&nbsp;wordBuffer,
int&nbsp;offset,
int&nbsp;wordLen)</code></th>
<td class="colLast">
<div class="block">Stem a word contained in a portion of a char[] array.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#stem(int)">stem</a></span>&#8203;(int&nbsp;i0)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/CharSequence.html?is-external=true" title="class or interface in java.lang" class="externalLink">CharSequence</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#stem(java.lang.CharSequence)">stem</a></span>&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/CharSequence.html?is-external=true" title="class or interface in java.lang" class="externalLink">CharSequence</a>&nbsp;word)</code></th>
<td class="colLast">
<div class="block">Stem a word provided as a CharSequence.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#stem(java.lang.String)">stem</a></span>&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;s)</code></th>
<td class="colLast">
<div class="block">Stem a word provided as a String.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toString()">toString</a></span>()</code></th>
<td class="colLast">
<div class="block">After a word has been stemmed, it can be retrieved by toString(),
or a reference to the internal buffer can be retrieved by getResultBuffer
and getResultLength (which is generally more efficient.)</div>
</td>
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<h3>Methods inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a></h3>
<code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang" class="externalLink">equals</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang" class="externalLink">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang" class="externalLink">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang" class="externalLink">notify</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang" class="externalLink">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#wait(long,int)" title="class or interface in java.lang" class="externalLink">wait</a></code></li>
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<h4>PorterStemmer</h4>
<pre>public&nbsp;PorterStemmer()</pre>
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<h4>reset</h4>
<pre class="methodSignature">public&nbsp;void&nbsp;reset()</pre>
<div class="block">reset() resets the stemmer so it can stem another word. If you invoke
the stemmer by calling add(char) and then stem(), you must call reset()
before starting another word.</div>
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<h4>add</h4>
<pre class="methodSignature">public&nbsp;void&nbsp;add&#8203;(char&nbsp;ch)</pre>
<div class="block">Add a character to the word being stemmed. When you are finished
adding characters, you can call stem(void) to process the word.</div>
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<h4>toString</h4>
<pre class="methodSignature">public&nbsp;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;toString()</pre>
<div class="block">After a word has been stemmed, it can be retrieved by toString(),
or a reference to the internal buffer can be retrieved by getResultBuffer
and getResultLength (which is generally more efficient.)</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang" class="externalLink">toString</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a></code></dd>
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<h4>getResultLength</h4>
<pre class="methodSignature">public&nbsp;int&nbsp;getResultLength()</pre>
<div class="block">Returns the length of the word resulting from the stemming process.</div>
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<h4>getResultBuffer</h4>
<pre class="methodSignature">public&nbsp;char[]&nbsp;getResultBuffer()</pre>
<div class="block">Returns a reference to a character buffer containing the results of
the stemming process. You also need to consult getResultLength()
to determine the length of the result.</div>
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<h4>stem</h4>
<pre class="methodSignature">public&nbsp;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;stem&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;s)</pre>
<div class="block">Stem a word provided as a String. Returns the result as a String.</div>
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<pre class="methodSignature">public&nbsp;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/CharSequence.html?is-external=true" title="class or interface in java.lang" class="externalLink">CharSequence</a>&nbsp;stem&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/CharSequence.html?is-external=true" title="class or interface in java.lang" class="externalLink">CharSequence</a>&nbsp;word)</pre>
<div class="block">Stem a word provided as a CharSequence.
Returns the result as a CharSequence.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="Stemmer.html#stem(java.lang.CharSequence)">stem</a></code>&nbsp;in interface&nbsp;<code><a href="Stemmer.html" title="interface in opennlp.tools.stemmer">Stemmer</a></code></dd>
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<h4>stem</h4>
<pre class="methodSignature">public&nbsp;boolean&nbsp;stem&#8203;(char[]&nbsp;word)</pre>
<div class="block">Stem a word contained in a char[]. Returns true if the stemming process
resulted in a word different from the input. You can retrieve the
result with getResultLength()/getResultBuffer() or toString().</div>
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<h4>stem</h4>
<pre class="methodSignature">public&nbsp;boolean&nbsp;stem&#8203;(char[]&nbsp;wordBuffer,
int&nbsp;offset,
int&nbsp;wordLen)</pre>
<div class="block">Stem a word contained in a portion of a char[] array. Returns
true if the stemming process resulted in a word different from
the input. You can retrieve the result with
getResultLength()/getResultBuffer() or toString().</div>
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<h4>stem</h4>
<pre class="methodSignature">public&nbsp;boolean&nbsp;stem&#8203;(char[]&nbsp;word,
int&nbsp;wordLen)</pre>
<div class="block">Stem a word contained in a leading portion of a char[] array.
Returns true if the stemming process resulted in a word different
from the input. You can retrieve the result with
getResultLength()/getResultBuffer() or toString().</div>
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<a id="stem()">
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<h4>stem</h4>
<pre class="methodSignature">public&nbsp;boolean&nbsp;stem()</pre>
<div class="block">Stem the word placed into the Stemmer buffer through calls to add().
Returns true if the stemming process resulted in a word different
from the input. You can retrieve the result with
getResultLength()/getResultBuffer() or toString().</div>
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<h4>stem</h4>
<pre class="methodSignature">public&nbsp;boolean&nbsp;stem&#8203;(int&nbsp;i0)</pre>
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