public ModifyCustomDBEngineVersionRequest withEngine(String engine) {
        setEngine(engine);
        return this;
    }
<p>
The database engine. RDS Custom for Oracle supports the following values:
</p>
<ul>
<li>
<p>
<code>custom-oracle-ee</code>
</p>
</li>
<li>
<p>
<code>custom-oracle-ee-cdb</code>
</p>
</li>
<li>
<p>
<code>custom-oracle-se2</code>
</p>
</li>
<li>
<p>
<code>custom-oracle-se2-cdb</code>
</p>
</li>
</ul>

@param engine
       The database engine. RDS Custom for Oracle supports the following values:</p>
       <ul>
       <li>
       <p>
       <code>custom-oracle-ee</code>
       </p>
       </li>
       <li>
       <p>
       <code>custom-oracle-ee-cdb</code>
       </p>
       </li>
       <li>
       <p>
       <code>custom-oracle-se2</code>
       </p>
       </li>
       <li>
       <p>
       <code>custom-oracle-se2-cdb</code>
       </p>
       </li>
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-rds/src/main/java/com/amazonaws/services/rds/model/ModifyCustomDBEngineVersionRequest.java