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() {
+  OnCancel();
+}
+
+void PrerenderHandle::OnNavigateAway() {
+  DCHECK(CalledOnValidThread());
+  // TODO(gavinp): Implement reasonable behaviour for navigation away from
+  // launcher. We can't just call OnCancel, because many cases have redirect
+  // chains that will eventually lead to the correct prerendered page, and we
+  // don't want to delete our prerender just as it is going to be used.
+  prerender_data_.reset();
+}
+
+void PrerenderHandle::OnCancel() {
+  DCHECK(CalledOnValidThread());
+  if (!prerender_data_)
+    return;
+
+  if (--prerender_data_->instance_count == 0) {
+    if (IsPrerendering()) {
+      prerender_data_->contents->Destroy(FINAL_STATUS_CANCELLED);
+    } else if (IsPending()) {
+      prerender_data_->manager->DestroyPendingPrerenderData(prerender_data_);
+    } else {
+      NOTREACHED();
+    }
+  }
+  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();
+}
+
+// private
+PrerenderHandle::PrerenderHandle() : weak_ptr_factory_(this) {
+}
+
+PrerenderHandle::PrerenderHandle(
+    PrerenderManager::PrerenderData* prerender_data)
+    : prerender_data_(prerender_data->weak_ptr_factory->GetWeakPtr()),
+      weak_ptr_factory_(this) {
+}
+
+void PrerenderHandle::SwapPrerenderDataWith(
+    PrerenderHandle* other_prerender_handle) {
+  DCHECK(CalledOnValidThread());
+  DCHECK(other_prerender_handle);
+  std::swap(prerender_data_, other_prerender_handle->prerender_data_);
+}
+
+}  // namespace prerender