public java.lang.String getSourceProvider() {
      java.lang.Object ref = sourceProvider_;
      if (!(ref instanceof java.lang.String)) {
        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        sourceProvider_ = s;
        return s;
      } else {
        return (java.lang.String) ref;
      }
    }
<pre>
Output only. Source provider is the author of a public blueprint, from
which this blueprint is created.
</pre>

<code>string source_provider = 13 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>

@return The sourceProvider.
java-telcoautomation/proto-google-cloud-telcoautomation-v1/src/main/java/com/google/cloud/telcoautomation/v1/Blueprint.java