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<div class="subTitle">org.eclipse.persistence.descriptors</div>
<h2 title="Class ClassExtractor" class="title">Class ClassExtractor</h2>
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<li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
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<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../../org/eclipse/persistence/descriptors/MethodClassExtractor.html" title="class in org.eclipse.persistence.descriptors">MethodClassExtractor</a></dd>
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<pre>public abstract class <span class="typeNameLabel">ClassExtractor</span>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
<div class="block"><p><b>Purpose</b>:
Abstract class to allow complex inheritance support. Typically class indicators are used to define inheritance in the database,
however in complex cases the class type may be determined through another mechanism.
The class extractor must be able to determine and return the class type from the database row.</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../org/eclipse/persistence/descriptors/InheritancePolicy.html#setClassExtractor-org.eclipse.persistence.descriptors.ClassExtractor-"><code>InheritancePolicy.setClassExtractor(ClassExtractor)</code></a></dd>
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<h3>Constructor Summary</h3>
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<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/eclipse/persistence/descriptors/ClassExtractor.html#ClassExtractor--">ClassExtractor</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>abstract <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/eclipse/persistence/descriptors/ClassExtractor.html#extractClassFromRow-org.eclipse.persistence.sessions.Record-org.eclipse.persistence.sessions.Session-">extractClassFromRow</a></span>(<a href="../../../../org/eclipse/persistence/sessions/Record.html" title="interface in org.eclipse.persistence.sessions">Record</a>&nbsp;databaseRow,
<a href="../../../../org/eclipse/persistence/sessions/Session.html" title="interface in org.eclipse.persistence.sessions">Session</a>&nbsp;session)</code>
<div class="block">Extract/compute the class from the database row and return the class.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/eclipse/persistence/descriptors/ClassExtractor.html#initialize-org.eclipse.persistence.descriptors.ClassDescriptor-org.eclipse.persistence.sessions.Session-">initialize</a></span>(<a href="../../../../org/eclipse/persistence/descriptors/ClassDescriptor.html" title="class in org.eclipse.persistence.descriptors">ClassDescriptor</a>&nbsp;descriptor,
<a href="../../../../org/eclipse/persistence/sessions/Session.html" title="interface in org.eclipse.persistence.sessions">Session</a>&nbsp;session)</code>
<div class="block">Allow for any initialization.</div>
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<h3>Methods inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/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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<h4>ClassExtractor</h4>
<pre>public&nbsp;ClassExtractor()</pre>
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<pre>public abstract&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&nbsp;extractClassFromRow(<a href="../../../../org/eclipse/persistence/sessions/Record.html" title="interface in org.eclipse.persistence.sessions">Record</a>&nbsp;databaseRow,
<a href="../../../../org/eclipse/persistence/sessions/Session.html" title="interface in org.eclipse.persistence.sessions">Session</a>&nbsp;session)</pre>
<div class="block">Extract/compute the class from the database row and return the class.
Map is used as the public interface to database row, the key is the field name,
the value is the database value.</div>
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<h4>initialize</h4>
<pre>public&nbsp;void&nbsp;initialize(<a href="../../../../org/eclipse/persistence/descriptors/ClassDescriptor.html" title="class in org.eclipse.persistence.descriptors">ClassDescriptor</a>&nbsp;descriptor,
<a href="../../../../org/eclipse/persistence/sessions/Session.html" title="interface in org.eclipse.persistence.sessions">Session</a>&nbsp;session)
throws <a href="../../../../org/eclipse/persistence/exceptions/DescriptorException.html" title="class in org.eclipse.persistence.exceptions">DescriptorException</a></pre>
<div class="block">Allow for any initialization.</div>
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<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../org/eclipse/persistence/exceptions/DescriptorException.html" title="class in org.eclipse.persistence.exceptions">DescriptorException</a></code></dd>
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