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// Copyright (c) 2012 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/prerender/prerender_field_trial.h"
#include <string>
#include "base/command_line.h"
#include "base/logging.h"
#include "base/metrics/field_trial.h"
#include "chrome/browser/prerender/prerender_manager.h"
#include "chrome/common/chrome_switches.h"
namespace prerender {
void ConfigurePrerender(const base::CommandLine& command_line) {
PrerenderManager::PrerenderManagerMode mode =
PrerenderManager::PRERENDER_MODE_ENABLED;
if (command_line.HasSwitch(switches::kPrerenderMode)) {
const std::string switch_value =
command_line.GetSwitchValueASCII(switches::kPrerenderMode);
if (switch_value == switches::kPrerenderModeSwitchValueDisabled) {
mode = PrerenderManager::PRERENDER_MODE_DISABLED;
} else if (switch_value.empty() ||
switch_value == switches::kPrerenderModeSwitchValueEnabled) {
// The empty string means the option was provided with no value, and that
// means enable.
mode = PrerenderManager::PRERENDER_MODE_ENABLED;
} else {
mode = PrerenderManager::PRERENDER_MODE_DISABLED;
LOG(ERROR) << "Invalid --prerender option received on command line: "
<< switch_value;
LOG(ERROR) << "Disabling prerendering!";
}
}
PrerenderManager::SetMode(mode);
}
bool IsOmniboxEnabled(Profile* profile) {
if (!profile)
return false;
if (!PrerenderManager::IsPrerenderingPossible())
return false;
// Override any field trial groups if the user has set a command line flag.
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kPrerenderFromOmnibox)) {
const std::string switch_value =
base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
switches::kPrerenderFromOmnibox);
if (switch_value == switches::kPrerenderFromOmniboxSwitchValueEnabled)
return true;
if (switch_value == switches::kPrerenderFromOmniboxSwitchValueDisabled)
return false;
DCHECK_EQ(switches::kPrerenderFromOmniboxSwitchValueAuto, switch_value);
}
return (base::FieldTrialList::FindFullName("PrerenderFromOmnibox") !=
"OmniboxPrerenderDisabled");
}
} // namespace prerender
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