@Override
	public boolean isVolatile() {
		throw new UnsupportedOperationException();
	}
DataStub can be extended for use by tests. It throws an UnsupportedOperationException
for all methods in the Data interface. Any method that is needed for your test can then
be overridden so it can provide its own test implementation and return value.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/listing/DataStub.java