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original.java

public boolean contains(String name) {
  if(name == null) {
    return false;
  }
  if(factory.exists(name)) {
    Marker other = factory.getMarker(name);
    return contains(other);     
  } else {
    return false;
  }
}

modified.java

public boolean contains(String name) {
  if(name == null) {
    throw new IllegalArgumentException("Other cannot be null");
  }
  
  if (this.name.equals(name)) {
    return true;
  }
  
  if (hasChildren()) {
    for(int i = 0; i < children.size(); i++) {
      Marker child = (Marker) children.get(i);
      if(child.contains(name)) {
        return true;
      }
    }     
  }
  
  return false;
}