public StreamInterface findInfoStream(StepMeta infoStep) {
   for (StreamInterface stream : getInfoStreams()) {
     if (infoStep.equals(stream.getStepMeta())) {
       return stream;
     }
   }
   return null;
 }
 public StreamInterface findTargetStream(StepMeta targetStep) {
   for (StreamInterface stream : getTargetStreams()) {
     if (targetStep.equals(stream.getStepMeta())) {
       return stream;
     }
   }
   return null;
 }