blob: d07d461fb7f389857e708978d627714f43630b38 [file] [log] [blame]
// Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
/// @assertion LinkedHashMap({bool equals(K key1, K key2), int hashCode(K key),
/// bool isValidKey(potentialKey)})
/// If the [equals] or [hashCode] methods won't work on all objects, but only on
/// some instances of [E], the [isValidKey] predicate can be used to restrict the
/// keys that the functions are applied to. Any key for which [isValidKey]
/// returns false is automatically assumed to not be in the set when asking
/// [contains].
/// @description Checks that [isValidKey] is called before calling [equals] or
/// [hashCode]
/// @author sgrekhov@unipro.ru
import "../../../Utils/expect.dart";
import "dart:collection";
bool checkDone = false;
bool isValidKeyCalled = false;
bool myEquals(var key1, var key2) {
if (!checkDone) {
Expect.isTrue(isValidKeyCalled);
checkDone = true;
}
return key1 == key2;
}
int myHashCode(var key) {
if (!checkDone) {
Expect.isTrue(isValidKeyCalled);
checkDone = true;
}
return key.hashCode;
}
bool isValidKey(var potentialKey) {
isValidKeyCalled = true;
return potentialKey is int;
}
reset() {
checkDone = false;
isValidKeyCalled = false;
}
skip() {
isValidKeyCalled = true;
}
main() {
LinkedHashSet set = new LinkedHashSet(equals: myEquals, hashCode: myHashCode,
isValidKey: isValidKey);
skip();
set.add(1);
reset();
Expect.isTrue(set.contains(1));
reset();
Expect.isTrue(set.remove(1));
reset();
Expect.isFalse(set.contains(1));
}