public com.google.cloud.vmmigration.v1.SourceOrBuilder getSourceOrBuilder() {
      if (sourceBuilder_ != null) {
        return sourceBuilder_.getMessageOrBuilder();
      } else {
        return source_ == null
            ? com.google.cloud.vmmigration.v1.Source.getDefaultInstance()
            : source_;
      }
    }
<pre>
Required. The update request body.
</pre>

<code>
.google.cloud.vmmigration.v1.Source source = 2 [(.google.api.field_behavior) = REQUIRED];
</code>
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/UpdateSourceRequest.java