Refactor language detection logic to allow non-static CLD data sources.

chrome/browser/translate/cld_data_harness_factory.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/translate/cld_data_harness_factory.h"
+
+#include "base/lazy_instance.h"
+#include "chrome/browser/translate/component_cld_data_harness.h"
+#include "chrome/browser/translate/standalone_cld_data_harness.h"
+
+namespace {
+
+// This is the global instance managed by Get/Set
+test::CldDataHarnessFactory* g_instance = NULL;
+
+// Global instance wrappers
+class ComponentCldDataHarnessFactory : public test::CldDataHarnessFactory {
+ public:
+  virtual scoped_ptr<test::CldDataHarness> CreateCldDataHarness() override {
+    return test::CldDataHarness::COMPONENT();
+  }

[jochen (gone - plz use gerrit), 2014/10/23 13:57:39]

nit. disallow copy & assign, please also add virtual dtor()

[Andrew Hayden (chromium.org), 2014/10/30 16:56:31]

These classes have been purged. With fire.

+};

[jochen (gone - plz use gerrit), 2014/10/23 13:57:39]

nit space after this line (and everywhere)

[Andrew Hayden (chromium.org), 2014/10/30 16:56:32]

Done.

+struct WrappedComponent {
+  WrappedComponent() {
+    value = new ComponentCldDataHarnessFactory();
+  }
+  test::CldDataHarnessFactory* value;

[jochen (gone - plz use gerrit), 2014/10/23 13:57:39]

i don't understand why you need this pattern. Just
LazyInstance<ComponentCldDataHarnessFactory>::Leaky should be enough, no?

[Andrew Hayden (chromium.org), 2014/10/30 16:56:31]

Yep!

+};
+base::LazyInstance<WrappedComponent>::Leaky g_wrapped_component =
+    LAZY_INSTANCE_INITIALIZER;
+
+class StandaloneCldDataHarnessFactory : public test::CldDataHarnessFactory {
+ public:
+  virtual scoped_ptr<test::CldDataHarness> CreateCldDataHarness() override {
+    return test::CldDataHarness::STANDALONE();
+  }
+};
+struct WrappedStandalone {
+  WrappedStandalone() {
+    value = new StandaloneCldDataHarnessFactory();
+  }
+  test::CldDataHarnessFactory* value;
+};
+base::LazyInstance<WrappedStandalone>::Leaky g_wrapped_standalone =
+    LAZY_INSTANCE_INITIALIZER;
+
+class StaticCldDataHarnessFactory : public test::CldDataHarnessFactory {
+ public:
+  virtual scoped_ptr<test::CldDataHarness> CreateCldDataHarness() override {
+    return test::CldDataHarness::STATIC();
+  }
+};
+struct WrappedStatic {
+  WrappedStatic() {
+    value = new StaticCldDataHarnessFactory();
+  }
+  test::CldDataHarnessFactory* value;
+};
+base::LazyInstance<WrappedStatic>::Leaky g_wrapped_static =
+    LAZY_INSTANCE_INITIALIZER;
+
+class NoneCldDataHarnessFactory : public test::CldDataHarnessFactory {
+ public:
+  virtual scoped_ptr<test::CldDataHarness> CreateCldDataHarness() override {
+    return test::CldDataHarness::NONE();
+  }
+};
+struct WrappedNone {
+  WrappedNone() {
+    value = new NoneCldDataHarnessFactory();
+  }
+  test::CldDataHarnessFactory* value;
+};
+base::LazyInstance<WrappedNone>::Leaky g_wrapped_none =
+    LAZY_INSTANCE_INITIALIZER;
+
+}  // namespace
+
+namespace test {
+
+CldDataHarnessFactory::CldDataHarnessFactory() {
+  // Nothing
+}
+
+CldDataHarnessFactory::~CldDataHarnessFactory() {
+  // Nothing
+}
+
+scoped_ptr<CldDataHarness> CldDataHarnessFactory::CreateCldDataHarness() {
+  scoped_ptr<CldDataHarness> result(new CldDataHarness());
+  return result.Pass();
+}
+
+CldDataHarnessFactory* CldDataHarnessFactory::Get() {
+  if (g_instance == NULL) {
+    return NONE();
+  }
+  return g_instance;
+}
+
+void CldDataHarnessFactory::Set(CldDataHarnessFactory* instance) {
+  g_instance = instance;
+}
+
+/* static */ CldDataHarnessFactory* CldDataHarnessFactory::NONE() {

[Takashi Toyoshima, 2014/10/15 08:45:07]

// static
CldDataHarnessFactory* CldDataHarnessFactory::...() {
  ...
}

[Andrew Hayden (chromium.org), 2014/10/30 16:56:31]

Done everywhere

+  return g_wrapped_none.Get().value;
+}
+
+/* static */ CldDataHarnessFactory* CldDataHarnessFactory::STATIC() {
+  return g_wrapped_static.Get().value;
+}
+
+/* static */ CldDataHarnessFactory* CldDataHarnessFactory::STANDALONE() {
+  return g_wrapped_standalone.Get().value;
+}
+
+/* static */ CldDataHarnessFactory* CldDataHarnessFactory::COMPONENT() {
+  return g_wrapped_component.Get().value;
+}
+
+}  // namespace test