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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/renderer_host/navigation_entry_restore_context_impl.h"
#include "content/browser/renderer_host/frame_navigation_entry.h"
namespace content {
// static
std::unique_ptr<NavigationEntryRestoreContext>
NavigationEntryRestoreContext::Create() {
return std::make_unique<NavigationEntryRestoreContextImpl>();
}
NavigationEntryRestoreContextImpl::NavigationEntryRestoreContextImpl() =
default;
NavigationEntryRestoreContextImpl::~NavigationEntryRestoreContextImpl() =
default;
void NavigationEntryRestoreContextImpl::AddFrameNavigationEntry(
FrameNavigationEntry* entry) {
// Do not track FrameNavigationEntries for the default ISN of 0, since this
// value can be used for any arbitrary document.
if (entry->item_sequence_number() == 0) {
return;
}
auto [it, inserted] =
entries_.try_emplace(Key(entry->item_sequence_number(),
entry->frame_unique_name(), entry->url()),
entry);
// The checks here should be consistent with GetFrameNavigationEntry and this
// is only expected to be called after that function fails to find an entry,
// so we don't expect there to be an entry for this key already.
DCHECK(inserted);
}
FrameNavigationEntry*
NavigationEntryRestoreContextImpl::GetFrameNavigationEntry(
int64_t item_sequence_number,
const std::string& unique_name,
const GURL& url) {
// Note: Ensure the checks here are consistent with AddFrameNavigationEntry,
// to satisfy the DCHECK there. See https://crbug.com/1275257.
if (item_sequence_number == 0)
return nullptr;
auto it = entries_.find(Key(item_sequence_number, unique_name, url));
if (it == entries_.end())
return nullptr;
return it->second;
}
bool NavigationEntryRestoreContextImpl::Key::Compare::operator()(
const Key& x,
const Key& y) const {
if (x.item_sequence_number_ != y.item_sequence_number_) {
return x.item_sequence_number_ > y.item_sequence_number_;
}
if (x.unique_name_ != y.unique_name_) {
return x.unique_name_ > y.unique_name_;
}
return x.url_ > y.url_;
}
} // namespace content
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