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import org.checkerframework.checker.nullness.qual.NonNull;
public class FlowNegation {
void testSimpleValid() {
String s = "m";
s.toString();
}
void testCase1() {
String s = "m";
// :: warning: (known.nonnull)
if (s != null) {
} else {
// nothing to do
}
s.toString();
}
void testCase2() {
String s = "m";
// :: warning: (known.nonnull)
if (s == null) {
} else {
// nothing to do
}
s.toString();
}
void testInvalidCase1() {
String s = "m";
// :: warning: (known.nonnull)
if (s != null) {
s = null;
} else {
// nothing to do
}
// :: error: (dereference.of.nullable)
s.toString(); // error
}
void testInvalidCase2() {
String s = "m";
// :: warning: (known.nonnull)
if (s != null) {
// nothing to do
} else {
s = null;
}
// :: error: (dereference.of.nullable)
s.toString(); // error
}
void testSimpleValidTernary() {
String s = "m";
s.toString();
}
void testTernaryCase1() {
String s = "m";
// :: warning: (known.nonnull)
Object m = (s != null) ? "m" : "n";
s.toString();
}
void testTernaryCase2() {
String s = "m";
// :: warning: (known.nonnull)
Object m = (s == null) ? "m" : "n";
s.toString();
}
void testTernaryInvalidCase1() {
String s = "m";
// :: warning: (known.nonnull)
Object m = (s != null) ? (s = null) : "n";
// :: error: (dereference.of.nullable)
s.toString(); // error
}
void testTernaryInvalidCase2() {
String s = "m";
// :: warning: (known.nonnull)
Object m = (s != null) ? "m" : (s = null);
// :: error: (dereference.of.nullable)
s.toString(); // error
}
void testAssignInCond() {
String s = "m";
if ((s = null) != "m") {
// :: error: (assignment.type.incompatible)
@NonNull String l0 = s;
} else {
}
// :: error: (assignment.type.incompatible)
@NonNull String l1 = s;
}
}
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