public PatchBaselineIdentity withOperatingSystem(OperatingSystem operatingSystem) {
        this.operatingSystem = operatingSystem.toString();
        return this;
    }
<p>
Defines the operating system the patch baseline applies to. The default value is <code>WINDOWS</code>.
</p>

@param operatingSystem
       Defines the operating system the patch baseline applies to. The default value is <code>WINDOWS</code>.
@return Returns a reference to this object so that method calls can be chained together.
@see OperatingSystem
aws-java-sdk-ssm/src/main/java/com/amazonaws/services/simplesystemsmanagement/model/PatchBaselineIdentity.java