public String getDirectoryId() {
        return this.directoryId;
    }
<p>
The Directory ID for which to get the list of associated Amazon SNS topics. If this member is null, associations
for all Directory IDs are returned.
</p>

@return The Directory ID for which to get the list of associated Amazon SNS topics. If this member is null,
        associations for all Directory IDs are returned.
aws-java-sdk-directory/src/main/java/com/amazonaws/services/directory/model/DescribeEventTopicsRequest.java