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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "chrome/browser/translate/cld_data_harness_factory.h" |
| 6 |
| 7 #include "base/lazy_instance.h" |
| 8 #include "chrome/browser/translate/component_cld_data_harness.h" |
| 9 #include "chrome/browser/translate/standalone_cld_data_harness.h" |
| 10 #include "components/translate/content/browser/browser_cld_utils.h" |
| 11 #include "components/translate/content/common/cld_data_source.h" |
| 12 |
| 13 namespace { |
| 14 |
| 15 // This is the global instance managed by Get/Set |
| 16 test::CldDataHarnessFactory* g_instance = NULL; |
| 17 |
| 18 // The following three instances are used to "cheat" in Create(). Each of them |
| 19 // is just an instance of this class, but because they are singletons they can |
| 20 // be compared using "this" to pick different behaviors in Create() at runtime. |
| 21 // This avoids the need to explicitly define boilerplate classes with no |
| 22 // significant value. |
| 23 // |
| 24 // Embedders can of course specify a different implementation of this class |
| 25 // using Set(CldDataHarnessFactory*), in which case Create() will have whatever |
| 26 // custom behavior is desired. |
| 27 base::LazyInstance<test::CldDataHarnessFactory>::Leaky g_wrapped_component = |
| 28 LAZY_INSTANCE_INITIALIZER; |
| 29 base::LazyInstance<test::CldDataHarnessFactory>::Leaky g_wrapped_standalone = |
| 30 LAZY_INSTANCE_INITIALIZER; |
| 31 base::LazyInstance<test::CldDataHarnessFactory>::Leaky g_wrapped_static = |
| 32 LAZY_INSTANCE_INITIALIZER; |
| 33 |
| 34 } // namespace |
| 35 |
| 36 namespace test { |
| 37 |
| 38 scoped_ptr<CldDataHarness> CldDataHarnessFactory::CreateCldDataHarness() { |
| 39 // Cheat: Since the three "canned" implementations are all well-known, just |
| 40 // check to see if "this" points to one of the singletons and then return |
| 41 // the right answer. Embedder-provided CldDataHarnessFactory implementations |
| 42 // will of course not have this behavior. |
| 43 if (this == GetStaticDataHarnessFactory()) { |
| 44 return CldDataHarness::CreateStaticDataHarness(); |
| 45 } |
| 46 if (this == GetStandaloneDataHarnessFactory()) { |
| 47 return CldDataHarness::CreateStandaloneDataHarness(); |
| 48 } |
| 49 if (this == GetComponentDataHarnessFactory()) { |
| 50 return CldDataHarness::CreateComponentDataHarness(); |
| 51 } |
| 52 |
| 53 // Embedder did something wrong, failed to override this method. |
| 54 NOTREACHED() << "Subclass failed to override CreateCldDataHarness()"; |
| 55 return CldDataHarness::CreateStaticDataHarness(); |
| 56 } |
| 57 |
| 58 CldDataHarnessFactory* CldDataHarnessFactory::Get() { |
| 59 // First honor any factory set by the embedder. |
| 60 if (g_instance != NULL) return g_instance; |
| 61 |
| 62 // Fall back to defaults: try to find a compatible harness for the currently- |
| 63 // configured CldDataSource. |
| 64 translate::BrowserCldUtils::ConfigureDefaultDataProvider(); |
| 65 if (translate::CldDataSource::IsUsingStaticDataSource()) { |
| 66 return GetStaticDataHarnessFactory(); |
| 67 } |
| 68 if (translate::CldDataSource::IsUsingComponentDataSource()) { |
| 69 return GetComponentDataHarnessFactory(); |
| 70 } |
| 71 if (translate::CldDataSource::IsUsingStandaloneDataSource()) { |
| 72 return GetStandaloneDataHarnessFactory(); |
| 73 } |
| 74 |
| 75 // The CldDataSource must have been set by an embedder, but the embedder has |
| 76 // not configured a corresponding CldDataHarnessFactory. This is an error; the |
| 77 // embedder must specify a harness that works with the corresponding |
| 78 // CldDataSource. Crash for debug builds and return a no-op harness for |
| 79 // everything else. |
| 80 NOTREACHED() << "No CLD data harness factory was configured!"; |
| 81 return GetStaticDataHarnessFactory(); |
| 82 } |
| 83 |
| 84 // static |
| 85 void CldDataHarnessFactory::Set(CldDataHarnessFactory* instance) { |
| 86 g_instance = instance; |
| 87 } |
| 88 |
| 89 // static |
| 90 CldDataHarnessFactory* |
| 91 CldDataHarnessFactory::GetStaticDataHarnessFactory() { |
| 92 return &g_wrapped_static.Get(); |
| 93 } |
| 94 |
| 95 // static |
| 96 CldDataHarnessFactory* |
| 97 CldDataHarnessFactory::GetStandaloneDataHarnessFactory() { |
| 98 return &g_wrapped_standalone.Get(); |
| 99 } |
| 100 |
| 101 // static |
| 102 CldDataHarnessFactory* |
| 103 CldDataHarnessFactory::GetComponentDataHarnessFactory() { |
| 104 return &g_wrapped_component.Get(); |
| 105 } |
| 106 |
| 107 } // namespace test |
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