Modularize Compact Language Detector 2 (CLD2) data sources

chrome/browser/translate/component_cld_data_harness.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 "component_cld_data_harness.h"
+
+#include "base/base_paths.h"
+#include "base/file_util.h"
+#include "base/logging.h"
+#include "base/path_service.h"
+#include "chrome/browser/component_updater/cld_component_installer.h"
+#include "chrome/common/chrome_paths.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+// This has to match what's in cld_component_installer.cc.
+const base::FilePath::CharType kComponentDataFileName[] =
+    FILE_PATH_LITERAL("cld2_data.bin");
+
+}  // namespace
+
+namespace test {
+
+ComponentCldDataHarness::ComponentCldDataHarness() {
+  // Constructor does nothing in all cases. See Init() for initialization.
+}
+
+ComponentCldDataHarness::~ComponentCldDataHarness() {
+  VLOG(1) << "Tearing down CLD data harness";
+  // Dynamic data mode is enabled and we are using the component updater.
+  component_updater::CldComponentInstallerTraits::SetLatestCldDataFile(
+      base::FilePath());
+  ClearComponentDataFileState();
+  DeleteComponentTree();
+}
+
+void ComponentCldDataHarness::Init() {
+  VLOG(1) << "Initializing CLD data harness";
+  // Dynamic data mode is enabled and we are using the component updater.
+  ASSERT_NO_FATAL_FAILURE(CopyComponentTree());
+  base::FilePath data_file;
+  GetComponentDataFileDestination(&data_file);
+  component_updater::CldComponentInstallerTraits::SetLatestCldDataFile(
+      data_file);
+}
+
+void ComponentCldDataHarness::ClearComponentDataFileState() {
+  VLOG(1) << "Clearing component CLD data file state";
+  base::FilePath nothing;
+  component_updater::CldComponentInstallerTraits::SetLatestCldDataFile(nothing);
+}
+
+// DIR_COMPONENT_CLD2 is also defined as being relative to USER_DATA_DIR, so
+// like GetStandaloneDataFileDestination, this is safe to run in multiple
+// parallel test processes.
+void ComponentCldDataHarness::GetExtractedComponentDestination(
+    base::FilePath* out_path) {
+  ASSERT_TRUE(PathService::Get(chrome::DIR_COMPONENT_CLD2, out_path));
+}
+
+void ComponentCldDataHarness::GetComponentDataFileDestination(
+    base::FilePath* out_path) {
+  GetExtractedComponentDestination(out_path);
+  *out_path = out_path->Append(CldDataHarness::GetTestDataSourceCrxVersion())
+                  .Append(FILE_PATH_LITERAL("_platform_specific"))
+                  .Append(FILE_PATH_LITERAL("all"))
+                  .Append(kComponentDataFileName);
+}
+
+void ComponentCldDataHarness::DeleteComponentTree() {
+  base::FilePath tree_path;
+  ASSERT_NO_FATAL_FAILURE(GetExtractedComponentDestination(&tree_path));
+  VLOG(1) << "Deleting CLD component test files from " << tree_path.value();
+  base::DeleteFile(tree_path, true);
+}
+
+void ComponentCldDataHarness::CopyComponentTree() {
+  DeleteComponentTree();  // sanity: blow away any old copies.
+  base::FilePath target_dir;
+  GetExtractedComponentDestination(&target_dir);
+  base::FilePath source_dir;
+  CldDataHarness::GetTestDataSourceDirectory(&source_dir);
+  VLOG(1) << "Copying CLD component test files from " << source_dir.value()
+          << " to " << target_dir.value();
+  ASSERT_TRUE(base::CreateDirectoryAndGetError(target_dir, NULL));
+  ASSERT_TRUE(base::CopyDirectory(source_dir, target_dir, true));
+  ASSERT_TRUE(base::PathExists(target_dir));
+  base::FilePath check_path;
+  GetComponentDataFileDestination(&check_path);
+  ASSERT_TRUE(base::PathExists(check_path));
+}
+
+scoped_ptr<CldDataHarness> CreateCldDataHarness() {
+  scoped_ptr<CldDataHarness> result(new ComponentCldDataHarness());
+  return result.Pass();
+}
+
+}  // namespace test