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import org.checkerframework.checker.nullness.qual.*;
@org.checkerframework.framework.qual.DefaultQualifier(Nullable.class)
public class FlowField {
public @Nullable String s = null;
void test() {
if (s != null) {
s.startsWith("foo");
}
}
static String field = "asdf";
static {
field = "asdf";
}
void testFields() {
// :: error: (dereference.of.nullable)
System.out.println(field.length());
}
// Fowrard reference to static finals
void test1() {
nonnull.toString();
}
static final String nonnull = new String();
class A {
protected String field = null;
}
class B extends A {
void test() {
assert field != null : "@AssumeAssertion(nullness)";
field.length();
}
}
static class BooleanWrapper {
@Nullable Object b;
}
@Nullable BooleanWrapper bw;
void testBitwise(@NonNull FlowField a, @NonNull FlowField b) {
Object r;
if (a.bw != null) {
if (b.bw != null) {
r = a.bw.b;
r = b.bw.b;
}
}
if (a.bw != null && b.bw != null) {
r = a.bw.b;
r = b.bw.b;
}
}
void testInstanceOf(@NonNull FlowField a) {
if (!(a.s instanceof String)) {
return;
}
@NonNull String s = a.s;
}
void testTwoLevels(@NonNull FlowField a, BooleanWrapper bwArg) {
// :: error: (dereference.of.nullable)
if (!(a.bw.hashCode() == 0)) // warning here
return;
Object o = a.bw.b; // but not here
}
}
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