@Override
    public String toString() {
        return "RefStreamDefinition{" +
                "streamId=" + streamId +
                ", partIdx=" + partIndex +
                ", pipeline=" + pipelineDocRef +
                ", pipelineVersion='" + pipelineVersion + '\'' +
                '}';
    }
One based part in the stream.
stroom-pipeline/src/main/java/stroom/pipeline/refdata/store/RefStreamDefinition.java