Implement ManifestFetcher, helper to fetch Web Manifests.

content/renderer/fetchers/web_url_loader_client_impl.h

+// 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.
+
+#ifndef CONTENT_RENDERER_FETCHERS_WEB_URL_LOADER_CLIENT_IMPL_H_
+#define CONTENT_RENDERER_FETCHERS_WEB_URL_LOADER_CLIENT_IMPL_H_
+
+#include <string>
+
+#include "base/memory/scoped_ptr.h"
+#include "third_party/WebKit/public/platform/WebURLLoaderClient.h"
+#include "third_party/WebKit/public/platform/WebURLResponse.h"
+
+namespace blink {
+class WebURLLoader;
+struct WebURLError;
+}
+
+namespace content {
+
+class WebURLLoaderClientImpl : public blink::WebURLLoaderClient {
+ protected:
+  enum LoadStatus {
+    LOADING,
+    LOAD_FAILED,
+    LOAD_SUCCEEDED,
+  };
+
+  WebURLLoaderClientImpl();
+  virtual ~WebURLLoaderClientImpl();
+
+  virtual void Cancel();
+
+  bool completed() const { return completed_; }
+  const std::string& data() const { return data_; }
+  const blink::WebURLResponse& response() const { return response_; }
+  const std::string& metadata() const { return metadata_; }
+  LoadStatus status() const { return status_; }
+
+  virtual void OnLoadComplete() = 0;
+
+ private:
+  void OnLoadCompleteInternal(LoadStatus);
+
+  // WebWebURLLoaderClientImpl methods:
+  virtual void didReceiveResponse(
+      blink::WebURLLoader* loader, const blink::WebURLResponse& response);
+  virtual void didReceiveCachedMetadata(
+      blink::WebURLLoader* loader, const char* data, int data_length);
+  virtual void didReceiveData(
+      blink::WebURLLoader* loader,
+      const char* data,
+      int data_length,
+      int encoded_data_length);
+  virtual void didFinishLoading(
+      blink::WebURLLoader* loader,
+      double finishTime,
+      int64_t total_encoded_data_length);
+  virtual void didFail(
+      blink::WebURLLoader* loader, const blink::WebURLError& error);
+
+ private:
+  // Set to true once the request is complete.
+  bool completed_;
+
+  // Buffer to hold the content from the server.
+  std::string data_;
+
+  // A copy of the original resource response.
+  blink::WebURLResponse response_;
+
+  // Buffer to hold metadata from the cache.
+  std::string metadata_;
+
+  LoadStatus status_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebURLLoaderClientImpl);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_FETCHERS_URL_LOADER_CLIENT_H_