/** Check that the assignment to a local variable is correct. */
protected void checkLocalAssign(
FlowGraph graph, LocalAssign a, DataFlowItem dfIn, DataFlowItem dfOut)
throws SemanticException {
LocalInstance li = ((Local) a.left()).localInstance();
if (!currCBI.localDeclarations.contains(li)) {
throw new SemanticException(
"Final local variable \"" + li.name() + "\" cannot be assigned to in an inner class.",
a.position());
}
MinMaxInitCount initCount = (MinMaxInitCount) dfOut.initStatus.get(li);
if (li.flags().isFinal() && InitCount.MANY.equals(initCount.getMax())) {
throw new SemanticException(
"variable \"" + li.name() + "\" might already have been assigned to", a.position());
}
}
/** Perform the appropriate flow operations for assignment to a local variable */
protected Map flowLocalAssign(
DataFlowItem inItem, FlowGraph graph, LocalAssign a, Set succEdgeKeys) {
Local l = (Local) a.left();
Map m = new HashMap(inItem.initStatus);
MinMaxInitCount initCount = (MinMaxInitCount) m.get(l.localInstance());
// initcount could be null if the local is defined in the outer
// class, or if we have not yet seen its declaration (i.e. the
// local is used in its own initialization)
if (initCount == null) {
initCount = new MinMaxInitCount(InitCount.ZERO, InitCount.ZERO);
}
initCount = new MinMaxInitCount(initCount.getMin().increment(), initCount.getMax().increment());
m.put(l.localInstance(), initCount);
return itemToMap(new DataFlowItem(m), succEdgeKeys);
}