.unique">UniqueIndex</a>&lt;A,&#8203;O&gt;</code></td>
<th class="colSecond" scope="row"><span class="typeNameLabel">UniqueIndex.</span><code><span class="memberNameLink"><a href="../UniqueIndex.html#onAttribute(com.googlecode.cqengine.index.support.Factory,com.googlecode.cqengine.attribute.Attribute)">onAttribute</a></span>&#8203;(<a href="../../support/Factory.html" title="interface in com.googlecode.cqengine.index.support">Factory</a>&lt;<a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurr