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// Copyright (c) 2011 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/sessions/session_utils.h"
#include <set>
#include "chrome/browser/sessions/tab_restore_service.h"
namespace {
// This class is used to compare two entries and considers that they are
// identical if they share the same URL. See FilteredEntries() below for how
// this is used.
class EntryComparator {
public:
bool operator() (const TabRestoreService::Entry* lhs,
const TabRestoreService::Entry* rhs) {
// Two entries are deemed identical when their visible title and URL are
// the same.
if (lhs->type == TabRestoreService::WINDOW ||
rhs->type == TabRestoreService::WINDOW)
return false;
DCHECK(lhs->type == TabRestoreService::TAB);
DCHECK(rhs->type == TabRestoreService::TAB);
const TabRestoreService::Tab* rh_tab =
static_cast<const TabRestoreService::Tab*>(rhs);
const TabRestoreService::Tab* lh_tab =
static_cast<const TabRestoreService::Tab*>(lhs);
const TabNavigation& rh_entry =
rh_tab->navigations[rh_tab->current_navigation_index];
const TabNavigation& lh_entry =
lh_tab->navigations[lh_tab->current_navigation_index];
if (rh_entry.title() == lh_entry.title())
return rh_entry.virtual_url().spec() < lh_entry.virtual_url().spec();
return rh_entry.title() < lh_entry.title();
}
};
} // namespace
void SessionUtils::FilteredEntries(const TabRestoreService::Entries& entries,
TabRestoreService::Entries* filtered_entries) {
// A set to remember the entries we already seen.
std::set<TabRestoreService::Entry*, EntryComparator> uniquing;
for (TabRestoreService::Entries::const_iterator iter = entries.begin();
iter != entries.end(); ++iter) {
TabRestoreService::Entry* entry = *iter;
if (uniquing.insert(entry).second)
// This entry was not seen before, add it to the list.
filtered_entries->push_back(entry);
}
}
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