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<div class="subTitle">org.apache.mahout.cf.taste.impl.model</div>
<h2 title="Class GenericDataModel" class="title">Class GenericDataModel</h2>
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<li><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/AbstractDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model">org.apache.mahout.cf.taste.impl.model.AbstractDataModel</a></li>
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<ul class="inheritance">
<li>org.apache.mahout.cf.taste.impl.model.GenericDataModel</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="http://docs.oracle.com/javase/7/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/common/Refreshable.html" title="interface in org.apache.mahout.cf.taste.common">Refreshable</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></dd>
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<pre>public final class <span class="typeNameLabel">GenericDataModel</span>
extends <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/AbstractDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model">AbstractDataModel</a></pre>
<div class="block"><p>
A simple <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model"><code>DataModel</code></a> which uses a given <a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util"><code>List</code></a> of users as its data source. This implementation
is mostly useful for small experiments and is not recommended for contexts where performance is important.
</p></div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../../../serialized-form.html#org.apache.mahout.cf.taste.impl.model.GenericDataModel">Serialized Form</a></dd>
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<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<h3>Constructor Summary</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation">
<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#GenericDataModel-org.apache.mahout.cf.taste.model.DataModel-">GenericDataModel</a></span>(<a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a>&nbsp;dataModel)</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;
<div class="block"><span class="deprecationComment">without direct replacement.
Consider <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#toDataMap-org.apache.mahout.cf.taste.model.DataModel-"><code>toDataMap(DataModel)</code></a> with <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#GenericDataModel-org.apache.mahout.cf.taste.impl.common.FastByIDMap-"><code>GenericDataModel(FastByIDMap)</code></a></span></div>
</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#GenericDataModel-org.apache.mahout.cf.taste.impl.common.FastByIDMap-">GenericDataModel</a></span>(<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastByIDMap.html" title="class in org.apache.mahout.cf.taste.impl.common">FastByIDMap</a>&lt;<a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a>&gt;&nbsp;userData)</code>
<div class="block">
Creates a new <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model"><code>GenericDataModel</code></a> from the given users (and their preferences).</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#GenericDataModel-org.apache.mahout.cf.taste.impl.common.FastByIDMap-org.apache.mahout.cf.taste.impl.common.FastByIDMap-">GenericDataModel</a></span>(<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastByIDMap.html" title="class in org.apache.mahout.cf.taste.impl.common">FastByIDMap</a>&lt;<a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a>&gt;&nbsp;userData,
<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastByIDMap.html" title="class in org.apache.mahout.cf.taste.impl.common">FastByIDMap</a>&lt;<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastByIDMap.html" title="class in org.apache.mahout.cf.taste.impl.common">FastByIDMap</a>&lt;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>&gt;&gt;&nbsp;timestamps)</code>
<div class="block">
Creates a new <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model"><code>GenericDataModel</code></a> from the given users (and their preferences).</div>
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<h3>Method Summary</h3>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></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>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/LongPrimitiveArrayIterator.html" title="class in org.apache.mahout.cf.taste.impl.common">LongPrimitiveArrayIterator</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#getItemIDs--">getItemIDs</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastIDSet.html" title="class in org.apache.mahout.cf.taste.impl.common">FastIDSet</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#getItemIDsFromUser-long-">getItemIDsFromUser</a></span>(long&nbsp;userID)</code>&nbsp;</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#getNumItems--">getNumItems</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#getNumUsers--">getNumUsers</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#getNumUsersWithPreferenceFor-long-">getNumUsersWithPreferenceFor</a></span>(long&nbsp;itemID)</code>&nbsp;</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#getNumUsersWithPreferenceFor-long-long-">getNumUsersWithPreferenceFor</a></span>(long&nbsp;itemID1,
long&nbsp;itemID2)</code>&nbsp;</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#getPreferencesForItem-long-">getPreferencesForItem</a></span>(long&nbsp;itemID)</code>&nbsp;</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#getPreferencesFromUser-long-">getPreferencesFromUser</a></span>(long&nbsp;userID)</code>&nbsp;</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#getPreferenceTime-long-long-">getPreferenceTime</a></span>(long&nbsp;userID,
long&nbsp;itemID)</code>
<div class="block">Retrieves the time at which a preference value from a user and item was set, if known.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Float.html?is-external=true" title="class or interface in java.lang">Float</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#getPreferenceValue-long-long-">getPreferenceValue</a></span>(long&nbsp;userID,
long&nbsp;itemID)</code>
<div class="block">Retrieves the preference value for a single user and item.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastByIDMap.html" title="class in org.apache.mahout.cf.taste.impl.common">FastByIDMap</a>&lt;<a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#getRawItemData--">getRawItemData</a></span>()</code>
<div class="block">This is used mostly internally to the framework, and shouldn't be relied upon otherwise.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastByIDMap.html" title="class in org.apache.mahout.cf.taste.impl.common">FastByIDMap</a>&lt;<a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#getRawUserData--">getRawUserData</a></span>()</code>
<div class="block">This is used mostly internally to the framework, and shouldn't be relied upon otherwise.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/LongPrimitiveArrayIterator.html" title="class in org.apache.mahout.cf.taste.impl.common">LongPrimitiveArrayIterator</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#getUserIDs--">getUserIDs</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#hasPreferenceValues--">hasPreferenceValues</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#refresh-java.util.Collection-">refresh</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;<a href="../../../../../../../org/apache/mahout/cf/taste/common/Refreshable.html" title="interface in org.apache.mahout.cf.taste.common">Refreshable</a>&gt;&nbsp;alreadyRefreshed)</code>
<div class="block">
Triggers "refresh" -- whatever that means -- of the implementation.</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#removePreference-long-long-">removePreference</a></span>(long&nbsp;userID,
long&nbsp;itemID)</code>
<div class="block">
Removes a particular preference for a user.</div>
</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#setPreference-long-long-float-">setPreference</a></span>(long&nbsp;userID,
long&nbsp;itemID,
float&nbsp;value)</code>
<div class="block">
Sets a particular preference (item plus rating) for a user.</div>
</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastByIDMap.html" title="class in org.apache.mahout.cf.taste.impl.common">FastByIDMap</a>&lt;<a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#toDataMap-org.apache.mahout.cf.taste.model.DataModel-">toDataMap</a></span>(<a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a>&nbsp;dataModel)</code>
<div class="block">Exports the simple user IDs and preferences in the data model.</div>
</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code>static <a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastByIDMap.html" title="class in org.apache.mahout.cf.taste.impl.common">FastByIDMap</a>&lt;<a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#toDataMap-org.apache.mahout.cf.taste.impl.common.FastByIDMap-boolean-">toDataMap</a></span>(<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastByIDMap.html" title="class in org.apache.mahout.cf.taste.impl.common">FastByIDMap</a>&lt;<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;<a href="../../../../../../../org/apache/mahout/cf/taste/model/Preference.html" title="interface in org.apache.mahout.cf.taste.model">Preference</a>&gt;&gt;&nbsp;data,
boolean&nbsp;byUser)</code>
<div class="block">Swaps, in-place, <a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util"><code>List</code></a>s for arrays in <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util"><code>Map</code></a> values .</div>
</td>
</tr>
<tr id="i19" class="rowColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#toString--">toString</a></span>()</code>&nbsp;</td>
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<h3>Methods inherited from class&nbsp;org.apache.mahout.cf.taste.impl.model.<a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/AbstractDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model">AbstractDataModel</a></h3>
<code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/AbstractDataModel.html#getMaxPreference--">getMaxPreference</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/AbstractDataModel.html#getMinPreference--">getMinPreference</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/AbstractDataModel.html#setMaxPreference-float-">setMaxPreference</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/AbstractDataModel.html#setMinPreference-float-">setMinPreference</a></code></li>
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<h3>Methods inherited from class&nbsp;java.lang.<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
<code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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<pre>public&nbsp;GenericDataModel(<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastByIDMap.html" title="class in org.apache.mahout.cf.taste.impl.common">FastByIDMap</a>&lt;<a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a>&gt;&nbsp;userData)</pre>
<div class="block"><p>
Creates a new <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model"><code>GenericDataModel</code></a> from the given users (and their preferences). This
<a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model"><code>DataModel</code></a> retains all this information in memory and is effectively immutable.
</p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>userData</code> - users to include; (see also <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#toDataMap-org.apache.mahout.cf.taste.impl.common.FastByIDMap-boolean-"><code>toDataMap(FastByIDMap, boolean)</code></a>)</dd>
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<pre>public&nbsp;GenericDataModel(<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastByIDMap.html" title="class in org.apache.mahout.cf.taste.impl.common">FastByIDMap</a>&lt;<a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a>&gt;&nbsp;userData,
<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastByIDMap.html" title="class in org.apache.mahout.cf.taste.impl.common">FastByIDMap</a>&lt;<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastByIDMap.html" title="class in org.apache.mahout.cf.taste.impl.common">FastByIDMap</a>&lt;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>&gt;&gt;&nbsp;timestamps)</pre>
<div class="block"><p>
Creates a new <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model"><code>GenericDataModel</code></a> from the given users (and their preferences). This
<a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model"><code>DataModel</code></a> retains all this information in memory and is effectively immutable.
</p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>userData</code> - users to include; (see also <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#toDataMap-org.apache.mahout.cf.taste.impl.common.FastByIDMap-boolean-"><code>toDataMap(FastByIDMap, boolean)</code></a>)</dd>
<dd><code>timestamps</code> - optionally, provided timestamps of preferences as milliseconds since the epoch.
User IDs are mapped to maps of item IDs to Long timestamps.</dd>
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<pre><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a>
public&nbsp;GenericDataModel(<a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a>&nbsp;dataModel)
throws <a href="../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;<span class="deprecationComment">without direct replacement.
Consider <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#toDataMap-org.apache.mahout.cf.taste.model.DataModel-"><code>toDataMap(DataModel)</code></a> with <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html#GenericDataModel-org.apache.mahout.cf.taste.impl.common.FastByIDMap-"><code>GenericDataModel(FastByIDMap)</code></a></span></div>
<div class="block"><p>
Creates a new <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model"><code>GenericDataModel</code></a> containing an immutable copy of the data from another given
<a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model"><code>DataModel</code></a>.
</p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>dataModel</code> - <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model"><code>DataModel</code></a> to copy</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></code> - if an error occurs while retrieving the other <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model"><code>DataModel</code></a>'s users</dd>
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<pre>public static&nbsp;<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastByIDMap.html" title="class in org.apache.mahout.cf.taste.impl.common">FastByIDMap</a>&lt;<a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a>&gt;&nbsp;toDataMap(<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastByIDMap.html" title="class in org.apache.mahout.cf.taste.impl.common">FastByIDMap</a>&lt;<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;<a href="../../../../../../../org/apache/mahout/cf/taste/model/Preference.html" title="interface in org.apache.mahout.cf.taste.model">Preference</a>&gt;&gt;&nbsp;data,
boolean&nbsp;byUser)</pre>
<div class="block">Swaps, in-place, <a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util"><code>List</code></a>s for arrays in <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util"><code>Map</code></a> values .</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>input value</dd>
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<pre>public static&nbsp;<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastByIDMap.html" title="class in org.apache.mahout.cf.taste.impl.common">FastByIDMap</a>&lt;<a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a>&gt;&nbsp;toDataMap(<a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a>&nbsp;dataModel)
throws <a href="../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></pre>
<div class="block">Exports the simple user IDs and preferences in the data model.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a <a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastByIDMap.html" title="class in org.apache.mahout.cf.taste.impl.common"><code>FastByIDMap</code></a> mapping user IDs to <a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model"><code>PreferenceArray</code></a>s representing
that user's preferences</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></code></dd>
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<pre>public&nbsp;<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastByIDMap.html" title="class in org.apache.mahout.cf.taste.impl.common">FastByIDMap</a>&lt;<a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a>&gt;&nbsp;getRawUserData()</pre>
<div class="block">This is used mostly internally to the framework, and shouldn't be relied upon otherwise.</div>
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<pre>public&nbsp;<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastByIDMap.html" title="class in org.apache.mahout.cf.taste.impl.common">FastByIDMap</a>&lt;<a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a>&gt;&nbsp;getRawItemData()</pre>
<div class="block">This is used mostly internally to the framework, and shouldn't be relied upon otherwise.</div>
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<h4>getUserIDs</h4>
<pre>public&nbsp;<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/LongPrimitiveArrayIterator.html" title="class in org.apache.mahout.cf.taste.impl.common">LongPrimitiveArrayIterator</a>&nbsp;getUserIDs()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>all user IDs in the model, in order</dd>
</dl>
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<pre>public&nbsp;<a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a>&nbsp;getPreferencesFromUser(long&nbsp;userID)
throws <a href="../../../../../../../org/apache/mahout/cf/taste/common/NoSuchUserException.html" title="class in org.apache.mahout.cf.taste.common">NoSuchUserException</a></pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>userID</code> - ID of user to get prefs for</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>user's preferences, ordered by item ID</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/common/NoSuchUserException.html" title="class in org.apache.mahout.cf.taste.common">NoSuchUserException</a></code> - if there is no such user</dd>
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<pre>public&nbsp;<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastIDSet.html" title="class in org.apache.mahout.cf.taste.impl.common">FastIDSet</a>&nbsp;getItemIDsFromUser(long&nbsp;userID)
throws <a href="../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>userID</code> - ID of user to get prefs for</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>IDs of items user expresses a preference for</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/common/NoSuchUserException.html" title="class in org.apache.mahout.cf.taste.common">NoSuchUserException</a></code> - if the user does not exist</dd>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></code> - if an error occurs while accessing the data</dd>
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<pre>public&nbsp;<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/LongPrimitiveArrayIterator.html" title="class in org.apache.mahout.cf.taste.impl.common">LongPrimitiveArrayIterator</a>&nbsp;getItemIDs()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a <a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/LongPrimitiveIterator.html" title="interface in org.apache.mahout.cf.taste.impl.common"><code>LongPrimitiveIterator</code></a> of all item IDs in the model, in order</dd>
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<pre>public&nbsp;<a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a>&nbsp;getPreferencesForItem(long&nbsp;itemID)
throws <a href="../../../../../../../org/apache/mahout/cf/taste/common/NoSuchItemException.html" title="class in org.apache.mahout.cf.taste.common">NoSuchItemException</a></pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>itemID</code> - item ID</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>all existing <a href="../../../../../../../org/apache/mahout/cf/taste/model/Preference.html" title="interface in org.apache.mahout.cf.taste.model"><code>Preference</code></a>s expressed for that item, ordered by user ID, as an array</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/common/NoSuchItemException.html" title="class in org.apache.mahout.cf.taste.common">NoSuchItemException</a></code> - if the item does not exist</dd>
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<pre>public&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Float.html?is-external=true" title="class or interface in java.lang">Float</a>&nbsp;getPreferenceValue(long&nbsp;userID,
long&nbsp;itemID)
throws <a href="../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getPreferenceValue-long-long-">DataModel</a></code></span></div>
<div class="block">Retrieves the preference value for a single user and item.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>userID</code> - user ID to get pref value from</dd>
<dd><code>itemID</code> - item ID to get pref value for</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>preference value from the given user for the given item or null if none exists</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/common/NoSuchUserException.html" title="class in org.apache.mahout.cf.taste.common">NoSuchUserException</a></code> - if the user does not exist</dd>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></code> - if an error occurs while accessing the data</dd>
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<pre>public&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>&nbsp;getPreferenceTime(long&nbsp;userID,
long&nbsp;itemID)
throws <a href="../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getPreferenceTime-long-long-">DataModel</a></code></span></div>
<div class="block">Retrieves the time at which a preference value from a user and item was set, if known.
Time is expressed in the usual way, as a number of milliseconds since the epoch.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>userID</code> - user ID for preference in question</dd>
<dd><code>itemID</code> - item ID for preference in question</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>time at which preference was set or null if no preference exists or its time is not known</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/common/NoSuchUserException.html" title="class in org.apache.mahout.cf.taste.common">NoSuchUserException</a></code> - if the user does not exist</dd>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></code> - if an error occurs while accessing the data</dd>
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<pre>public&nbsp;int&nbsp;getNumItems()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>total number of items known to the model. This is generally the union of all items preferred by
at least one user but could include more.</dd>
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<pre>public&nbsp;int&nbsp;getNumUsers()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>total number of users known to the model.</dd>
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<pre>public&nbsp;int&nbsp;getNumUsersWithPreferenceFor(long&nbsp;itemID)</pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>itemID</code> - item ID to check for</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the number of users who have expressed a preference for the item</dd>
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<pre>public&nbsp;int&nbsp;getNumUsersWithPreferenceFor(long&nbsp;itemID1,
long&nbsp;itemID2)</pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>itemID1</code> - first item ID to check for</dd>
<dd><code>itemID2</code> - second item ID to check for</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the number of users who have expressed a preference for the items</dd>
</dl>
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<pre>public&nbsp;void&nbsp;removePreference(long&nbsp;userID,
long&nbsp;itemID)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#removePreference-long-long-">DataModel</a></code></span></div>
<div class="block"><p>
Removes a particular preference for a user.
</p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>userID</code> - user from which to remove preference</dd>
<dd><code>itemID</code> - item to remove preference for</dd>
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<h4>setPreference</h4>
<pre>public&nbsp;void&nbsp;setPreference(long&nbsp;userID,
long&nbsp;itemID,
float&nbsp;value)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#setPreference-long-long-float-">DataModel</a></code></span></div>
<div class="block"><p>
Sets a particular preference (item plus rating) for a user.
</p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>userID</code> - user to set preference for</dd>
<dd><code>itemID</code> - item to set preference for</dd>
<dd><code>value</code> - preference value</dd>
</dl>
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<a name="refresh-java.util.Collection-">
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<h4>refresh</h4>
<pre>public&nbsp;void&nbsp;refresh(<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;<a href="../../../../../../../org/apache/mahout/cf/taste/common/Refreshable.html" title="interface in org.apache.mahout.cf.taste.common">Refreshable</a>&gt;&nbsp;alreadyRefreshed)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/common/Refreshable.html#refresh-java.util.Collection-">Refreshable</a></code></span></div>
<div class="block"><p>
Triggers "refresh" -- whatever that means -- of the implementation. The general contract is that any
<a href="../../../../../../../org/apache/mahout/cf/taste/common/Refreshable.html" title="interface in org.apache.mahout.cf.taste.common"><code>Refreshable</code></a> should always leave itself in a consistent, operational state, and that the refresh
atomically updates internal state from old to new.
</p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>alreadyRefreshed</code> - <a href="../../../../../../../org/apache/mahout/cf/taste/common/Refreshable.html" title="interface in org.apache.mahout.cf.taste.common"><code>Refreshable</code></a>s that are known to have already been
refreshed as a result of an initial call to a {#refresh(Collection)} method on some
object. This ensure that objects in a refresh dependency graph aren't refreshed twice
needlessly.</dd>
</dl>
</li>
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<a name="hasPreferenceValues--">
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<h4>hasPreferenceValues</h4>
<pre>public&nbsp;boolean&nbsp;hasPreferenceValues()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if this implementation actually stores and returns distinct preference values;
that is, if it is not a 'boolean' DataModel</dd>
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<h4>toString</h4>
<pre>public&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;toString()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a></code>&nbsp;in class&nbsp;<code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></dd>
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