protected ObjectAttribute<Vertex> getVertexAttribute(String attribName) {
		AttributeManager<Vertex> am = vertexAttributes();
		Attribute<Vertex> attrib = am.getAttribute(attribName);

		if (attrib == null) {
			attrib = vertexAttributes().createAttribute(attribName, AttributeManager.OBJECT_TYPE);
		}
		return (ObjectAttribute<Vertex>) attrib;
	}
This method gets and ObjectAttribute method give an attribute name.
If it is not found in the attribute manager, the attribute is 
created automatically.

@param attribName the attribute name
@return the attribute
Ghidra/Framework/Generic/src/main/java/ghidra/util/graph/DirectedGraph.java