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;
+
+base::LazyInstance<test::CldDataHarnessFactory>::Leaky g_wrapped_component =
+    LAZY_INSTANCE_INITIALIZER;
+base::LazyInstance<test::CldDataHarnessFactory>::Leaky g_wrapped_standalone =
+    LAZY_INSTANCE_INITIALIZER;
+base::LazyInstance<test::CldDataHarnessFactory>::Leaky g_wrapped_static =
+    LAZY_INSTANCE_INITIALIZER;
+
+}  // namespace
+
+namespace test {
+
+scoped_ptr<CldDataHarness> CldDataHarnessFactory::CreateCldDataHarness() {
+  if (this == GetStaticDataHarnessFactory()) {
+    return CldDataHarness::CreateStaticDataHarness();
+  }
+  if (this == GetStandaloneDataHarnessFactory()) {
+    return CldDataHarness::CreateStandaloneDataHarness();
+  }
+  if (this == GetComponentDataHarnessFactory()) {
+    return CldDataHarness::CreateComponentDataHarness();
+  }
+  NOTREACHED() << "Subclass failed to override CreateCldDataHarness()";
+  return CldDataHarness::CreateStaticDataHarness();
+}
+
+CldDataHarnessFactory* CldDataHarnessFactory::Get() {
+  DCHECK(g_instance != NULL) << "No CLD data harness factory was configured!";
+  if (g_instance != NULL) return g_instance;
+  return g_instance;
+}
+
+void CldDataHarnessFactory::Set(CldDataHarnessFactory* instance) {
+  g_instance = instance;
+}
+
+// static
+CldDataHarnessFactory*
+CldDataHarnessFactory::GetStaticDataHarnessFactory() {
+  return g_wrapped_static.Get();
+}
+
+// static
+CldDataHarnessFactory*
+CldDataHarnessFactory::GetStandaloneDataHarnessFactory() {
+  return g_wrapped_standalone.Get();
+}
+
+// static
+CldDataHarnessFactory*
+CldDataHarnessFactory::GetComponentDataHarnessFactory() {
+  return g_wrapped_component.Get();
+}
+
+}  // namespace test