Handle interface to prerenders.

chrome/browser/prerender/prerender_handle.cc

+// 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_handle.h"
+
+#include <algorithm>
+
+#include "chrome/browser/prerender/prerender_contents.h"
+
+namespace prerender {
+
+PrerenderHandle::~PrerenderHandle() {
+  DCHECK(!IsValid());
+  // This shouldn't occur, but we also shouldn't leak if it does.
+  if (IsValid())
+    OnCancel();
+}
+
+void PrerenderHandle::OnNavigateAway() {
+  DCHECK(CalledOnValidThread());
+  if (!IsValid())
+    return;
+  prerender_data_->OnNavigateAwayByHandle();
+  prerender_data_.reset();
+}
+
+void PrerenderHandle::OnCancel() {
+  DCHECK(CalledOnValidThread());
+  if (!IsValid())
+    return;
+  prerender_data_->OnCancelByHandle();
+  prerender_data_.reset();
+}
+
+bool PrerenderHandle::IsValid() const {
+  return prerender_data_ != NULL;
+}
+
+bool PrerenderHandle::IsPending() const {
+  DCHECK(CalledOnValidThread());
+  return prerender_data_ && !prerender_data_->contents();
+}
+
+bool PrerenderHandle::IsPrerendering() const {
+  DCHECK(CalledOnValidThread());
+  return prerender_data_ && prerender_data_->contents();
+}
+
+bool PrerenderHandle::IsFinishedLoading() const {
+  DCHECK(CalledOnValidThread());
+  if (!prerender_data_ || IsPending())
+    return false;
+  return prerender_data_->contents()->has_finished_loading();
+}
+
+PrerenderHandle::PrerenderHandle(
+    PrerenderManager::PrerenderData* prerender_data)
+    : prerender_data_(prerender_data->AsWeakPtr()),
+      weak_ptr_factory_(this) {
+  prerender_data->OnNewHandle();
+}
+
+void PrerenderHandle::SwapPrerenderDataWith(
+    PrerenderHandle* other_prerender_handle) {
+  DCHECK(CalledOnValidThread());
+  DCHECK(other_prerender_handle);
+  std::swap(prerender_data_, other_prerender_handle->prerender_data_);
+}
+
+}  // namespace prerender