public void setSourceUpdateToken(String sourceUpdateToken) {
        this.sourceUpdateToken = sourceUpdateToken;
    }
<p>
The update token of the Amazon Web Services managed rule group that your own rule group is copied from. To
determine the update token for the managed rule group, call <a href=
"https://docs.aws.amazon.com/network-firewall/latest/APIReference/API_DescribeRuleGroup.html#networkfirewall-DescribeRuleGroup-response-UpdateToken"
>DescribeRuleGroup</a>.
</p>

@param sourceUpdateToken
       The update token of the Amazon Web Services managed rule group that your own rule group is copied from. To
       determine the update token for the managed rule group, call <a href=
       "https://docs.aws.amazon.com/network-firewall/latest/APIReference/API_DescribeRuleGroup.html#networkfirewall-DescribeRuleGroup-response-UpdateToken"
       >DescribeRuleGroup</a>.
aws-java-sdk-networkfirewall/src/main/java/com/amazonaws/services/networkfirewall/model/SourceMetadata.java