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| 1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file | |
| 2 // for details. All rights reserved. Use of this source code is governed by a | |
| 3 // BSD-style license that can be found in the LICENSE file. | |
| 4 // Dart test using an identity hash. | |
| 5 | |
| 6 interface BigGame extends Hashable { | |
| 7 final String name; | |
| 8 } | |
| 9 | |
| 10 class Giraffe implements BigGame { | |
| 11 final String name; | |
| 12 final int identityHash_; | |
| 13 | |
| 14 Giraffe(this.name) : identityHash_ = nextId() {} | |
| 15 | |
| 16 int hashCode() { | |
| 17 return identityHash_; | |
| 18 } | |
| 19 | |
| 20 // Calculate identity hash for a giraffe. | |
| 21 static int nextId_; | |
| 22 static int nextId() { | |
| 23 if (nextId_ == null) { | |
| 24 nextId_ = 17; | |
| 25 } | |
| 26 return nextId_++; | |
| 27 } | |
| 28 } | |
| 29 | |
| 30 class Zebra implements BigGame { | |
| 31 final String name; | |
| 32 Zebra(this.name) {} | |
| 33 } | |
| 34 | |
| 35 | |
| 36 class SavannahTest { | |
| 37 | |
| 38 static void testMain() { | |
| 39 Map<BigGame, String> savannah = new Map<BigGame, String>(); | |
| 40 Giraffe giraffe1 = new Giraffe("Tony"); | |
| 41 Giraffe giraffe2 = new Giraffe("Rose"); | |
| 42 savannah[giraffe1] = giraffe1.name; | |
| 43 savannah[giraffe2] = giraffe2.name; | |
| 44 | |
| 45 var count = savannah.length; | |
| 46 print("getCount is $count"); | |
| 47 Expect.equals(2, count); | |
| 48 print("giraffe1: " + savannah[giraffe1]); | |
| 49 print("giraffe2: " + savannah[giraffe2]); | |
| 50 Expect.equals("Tony", savannah[giraffe1]); | |
| 51 Expect.equals("Rose", savannah[giraffe2]); | |
| 52 | |
| 53 bool caught = false; | |
| 54 Zebra zebra1 = new Zebra("Paul"); | |
| 55 Zebra zebra2 = new Zebra("Joe"); | |
| 56 try { | |
| 57 savannah[zebra1] = zebra1.name; | |
| 58 savannah[zebra2] = zebra2.name; | |
| 59 } catch (NoSuchMethodException e) { | |
| 60 print("Caught: $e"); | |
| 61 caught = true; | |
| 62 } | |
| 63 Expect.equals(true, caught); | |
| 64 | |
| 65 count = savannah.length; | |
| 66 print("getCount is $count"); | |
| 67 Expect.equals(2, count); | |
| 68 | |
| 69 caught = false; | |
| 70 try { | |
| 71 print("zebra1: " + savannah[zebra1]); | |
| 72 print("zebra2: " + savannah[zebra2]); | |
| 73 } catch (NoSuchMethodException e) { | |
| 74 print("Caught: $e"); | |
| 75 caught = true; | |
| 76 } | |
| 77 Expect.equals(true, caught); | |
| 78 } | |
| 79 | |
| 80 } | |
| 81 | |
| 82 main() { | |
| 83 SavannahTest.testMain(); | |
| 84 } | |
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