ePreconditions</span><wbr><span class="parameters">(<a href="EntityTag.html" title="class in jakarta.ws.rs.core">EntityTag</a>&nbsp;eTag)</span></div>
<div class="block">Evaluate request preconditions based on the passed in value.</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>eTag</code> - an ETag for the current state of the resource</dd>
<dt>Returns:</dt>
<dd><code>null</code> if the preconditions are met or a <code>ResponseBuilder</code> set with the appropriate status if the
 preconditions are