private PipelineConfigDependencyGraph findUpstream(PipelineConfig currentPipeline) {
List<PipelineConfigDependencyGraph> graphs = new ArrayList<>();
for (CaseInsensitiveString name : currentPipeline.upstreamPipelines()) {
PipelineConfig pipelineConfig = getCurrentConfig().pipelineConfigByName(name);
graphs.add(findUpstream(pipelineConfig));
}
return new PipelineConfigDependencyGraph(
currentPipeline, graphs.toArray(new PipelineConfigDependencyGraph[0]));
}
