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// 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"
#include "components/translate/content/browser/browser_cld_utils.h"
#include "components/translate/content/common/cld_data_source.h"
namespace {
// This is the global instance managed by Get/Set
test::CldDataHarnessFactory* g_instance = NULL;
// The following three instances are used to "cheat" in Create(). Each of them
// is just an instance of this class, but because they are singletons they can
// be compared using "this" to pick different behaviors in Create() at runtime.
// This avoids the need to explicitly define boilerplate classes with no
// significant value.
//
// Embedders can of course specify a different implementation of this class
// using Set(CldDataHarnessFactory*), in which case Create() will have whatever
// custom behavior is desired.
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() {
// Cheat: Since the three "canned" implementations are all well-known, just
// check to see if "this" points to one of the singletons and then return
// the right answer. Embedder-provided CldDataHarnessFactory implementations
// will of course not have this behavior.
if (this == GetStaticDataHarnessFactory()) {
return CldDataHarness::CreateStaticDataHarness();
}
if (this == GetStandaloneDataHarnessFactory()) {
return CldDataHarness::CreateStandaloneDataHarness();
}
if (this == GetComponentDataHarnessFactory()) {
return CldDataHarness::CreateComponentDataHarness();
}
// Embedder did something wrong, failed to override this method.
NOTREACHED() << "Subclass failed to override CreateCldDataHarness()";
return CldDataHarness::CreateStaticDataHarness();
}
CldDataHarnessFactory* CldDataHarnessFactory::Get() {
// First honor any factory set by the embedder.
if (g_instance != NULL) return g_instance;
// Fall back to defaults: try to find a compatible harness for the currently-
// configured CldDataSource.
translate::BrowserCldUtils::ConfigureDefaultDataProvider();
if (translate::CldDataSource::IsUsingStaticDataSource()) {
return GetStaticDataHarnessFactory();
}
if (translate::CldDataSource::IsUsingComponentDataSource()) {
return GetComponentDataHarnessFactory();
}
if (translate::CldDataSource::IsUsingStandaloneDataSource()) {
return GetStandaloneDataHarnessFactory();
}
// The CldDataSource must have been set by an embedder, but the embedder has
// not configured a corresponding CldDataHarnessFactory. This is an error; the
// embedder must specify a harness that works with the corresponding
// CldDataSource. Crash for debug builds and return a no-op harness for
// everything else.
NOTREACHED() << "No CLD data harness factory was configured!";
return GetStaticDataHarnessFactory();
}
// static
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
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