private JavaSymbol findMemberType(
Env env, JavaSymbol.TypeJavaSymbol site, String name, JavaSymbol.TypeJavaSymbol c) {
JavaSymbol bestSoFar = symbolNotFound;
for (JavaSymbol symbol : c.members().lookup(name)) {
if (symbol.kind == JavaSymbol.TYP) {
return isAccessible(env, site, symbol)
? symbol
: new AccessErrorJavaSymbol(symbol, Symbols.unknownType);
}
}
if (c.getSuperclass() != null) {
JavaSymbol symbol = findMemberType(env, site, name, c.getSuperclass().symbol);
if (symbol.kind < bestSoFar.kind) {
bestSoFar = symbol;
}
}
if (c.getInterfaces() == null) {
// Invariant to check that interfaces are not set only when we are looking into the symbol we
// are currently completing.
// required for generics
Preconditions.checkState(
c.completing, "interfaces of a symbol not currently completing are not set.");
Preconditions.checkState(c == site);
} else {
for (JavaType interfaceType : c.getInterfaces()) {
JavaSymbol symbol = findMemberType(env, site, name, interfaceType.symbol);
if (symbol.kind < bestSoFar.kind) {
bestSoFar = symbol;
}
}
}
return bestSoFar;
}
/** Finds field with given name. */
private Resolution findField(
Env env, JavaSymbol.TypeJavaSymbol site, String name, JavaSymbol.TypeJavaSymbol c) {
Resolution bestSoFar = unresolved();
Resolution resolution = new Resolution();
for (JavaSymbol symbol : c.members().lookup(name)) {
if (symbol.kind == JavaSymbol.VAR) {
if (isAccessible(env, site, symbol)) {
resolution.symbol = symbol;
resolution.type = resolveTypeSubstitution(symbol.type, c.type);
return resolution;
} else {
return Resolution.resolution(new AccessErrorJavaSymbol(symbol, Symbols.unknownType));
}
}
}
if (c.getSuperclass() != null) {
resolution = findField(env, site, name, c.getSuperclass().symbol);
if (resolution.symbol.kind < bestSoFar.symbol.kind) {
resolution.type = resolveTypeSubstitution(resolution.symbol.type, c.getSuperclass());
bestSoFar = resolution;
}
}
for (JavaType interfaceType : c.getInterfaces()) {
resolution = findField(env, site, name, interfaceType.symbol);
if (resolution.symbol.kind < bestSoFar.symbol.kind) {
bestSoFar = resolution;
}
}
return bestSoFar;
}
/** Is given class a subclass of given base class? */
@VisibleForTesting
static boolean isSubClass(JavaSymbol.TypeJavaSymbol c, JavaSymbol base) {
// TODO get rid of null check
if (c == null) {
return false;
}
// TODO see Javac
if (c == base) {
// same class
return true;
} else if ((base.flags() & Flags.INTERFACE) != 0) {
// check if class implements base
for (JavaType interfaceType : c.getInterfaces()) {
if (isSubClass(interfaceType.symbol, base)) {
return true;
}
}
// check if superclass implements base
return isSubClass(superclassSymbol(c), base);
} else {
// check if class extends base or its superclass extends base
return isSubClass(superclassSymbol(c), base);
}
}