private static Entity getEntity(String[] names, double simTime, Entity thisEnt, Entity objEnt)
throws Error {
Entity ent;
if (names[0].equals("this")) ent = thisEnt;
else if (names[0].equals("obj")) ent = objEnt;
else ent = Entity.getNamedEntity(names[0]);
if (ent == null) {
throw new Error(String.format("Could not find entity: %s", names[0]));
}
// Run the output chain up to the second last name
for (int i = 1; i < names.length - 1; ++i) {
String outputName = names[i];
OutputHandle oh = ent.getOutputHandle(outputName);
if (oh == null) {
throw new Error(
String.format("Output '%s' not found on entity '%s'", outputName, ent.getInputName()));
}
if (!Entity.class.isAssignableFrom(oh.getReturnType())) {
throw new Error(String.format("Output '%s' is not an entity output", outputName));
}
ent = oh.getValue(simTime, Entity.class);
}
return ent;
}
@Override
public ExpResult getVariableValue(String[] names) {
try {
errorString = null;
Entity ent = getEntity(names, simTime, thisEnt, objEnt);
String outputName = names[names.length - 1];
OutputHandle oh = ent.getOutputHandle(outputName);
if (oh == null) {
errorString =
String.format(
"Could not find output '%s' on entity '%s'", outputName, ent.getInputName());
return null;
}
return new ExpResult(oh.getValueAsDouble(simTime, 0));
} catch (Exception e) {
errorString = e.getMessage();
}
return null;
}