/**
* Check that the set of <code>LocalInstance</code>s <code>localsUsed</code>, which is the set of
* locals used in the inner class declared by <code>cb</code> are initialized before the class
* declaration.
*/
protected void checkLocalsUsedByInnerClass(
FlowGraph graph, ClassBody cb, Set localsUsed, DataFlowItem dfIn, DataFlowItem dfOut)
throws SemanticException {
for (Iterator iter = localsUsed.iterator(); iter.hasNext(); ) {
LocalInstance li = (LocalInstance) iter.next();
MinMaxInitCount initCount = (MinMaxInitCount) dfOut.initStatus.get(li);
if (!currCBI.localDeclarations.contains(li)) {
// the local wasn't defined in this scope.
currCBI.outerLocalsUsed.add(li);
} else if (initCount == null || InitCount.ZERO.equals(initCount.getMin())) {
// initCount will in general not be null, as the local variable
// li is declared in the current class; however, if the inner
// class is declared in the initializer of the local variable
// declaration, then initCount could in fact be null, as we
// leave the inner class before we have performed flowLocalDecl
// for the local variable declaration.
throw new SemanticException(
"Local variable \""
+ li.name()
+ "\" must be initialized before the class "
+ "declaration.",
cb.position());
}
}
}
/** 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());
}
}