LibTest/collection/SplayTreeMap/SplayTreeMap.fromIterables_A05_t02.dart

/*
 * 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 SplayTreeMap.fromIterables(Iterable<K> keys, Iterable<V> values,
 * [int compare(K key1, K key2), bool isValidKey(potentialKey)])
 * @description Checks that if isValidKey supplied and returns false then
 * element is assumed not to be in a map
 * @author sgrekhov@unipro.ru
 */
import "dart:collection";
import "../../../Utils/expect.dart";

class C {
  int value;
  C(this.value);
}

int compare(C key1, C key2) {
  return key1.value - key2.value;
}

bool isValidKey(C potentialKey) => potentialKey.value != 3;

main() {
  C c1 = new C(1);
  C c2 = new C(2);
  C c3 = new C(3);

  Iterable keys = [c1, c2, c3];
  Iterable values = [1, 2, 3];
  SplayTreeMap map = new SplayTreeMap.fromIterables(keys, values, compare,
      isValidKey);

  Expect.equals(3, map.length);
  Expect.isNull(map[c3]);
  Expect.isFalse(map.containsKey(c3));
  Expect.isNull(map.remove(c3));
}