Initial version of web intents registry

chrome/browser/intents/web_intents_registry.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 CHROME_BROWSER_INTENTS_WEB_INTENTS_REGISTRY_H_
+#define CHROME_BROWSER_INTENTS_WEB_INTENTS_REGISTRY_H_
+#pragma once
+
+#include "base/hash_tables.h"
+#include "base/memory/ref_counted.h"
+#include "chrome/browser/intents/web_intent_data.h"
+#include "chrome/browser/webdata/web_data_service.h"
+
+// Handles storing and retrieving of web intents in the web database.
+// The registry provides filtering logic to retrieve specific types of intents.
+class WebIntentsRegistry : public WebDataServiceConsumer {
+ public:
+  // Unique identifier for intent queries.
+  typedef int QueryID;
+
+  // An interface the WebIntentsRegistry uses to notify its clients when
+  // it has finished loading intents data from the web database.
+  class Consumer {
+   public:
+    // Notifies the observer that the intents request has been completed.
+    virtual void OnIntentsQueryDone(
+        QueryID query_id,
+        const std::vector<WebIntentData>& intents) = 0;
+
+   protected:
+    virtual ~Consumer() {}
+  };
+
+  WebIntentsRegistry();
+  virtual ~WebIntentsRegistry();
+
+  // Initializes, binds to a valid WebDataService.
+  void Initialize(scoped_refptr<WebDataService> wds);
+
+  // Registers a web intent provider.
+  void RegisterIntentProvider(const WebIntentData& intent);
+
+  // Removes a web intent provider from the registry.
+  void UnregisterIntentProvider(const WebIntentData& intent);
+
+  // Requests all intent providers matching |action|.
+  // |consumer| must not be NULL.
+  QueryID GetIntentProviders(const string16& action, Consumer* consumer);
+
+ private:
+   struct IntentsQuery;
+
+  // Maps web data requests to intents queries.
+  // Allows OnWebDataServiceRequestDone to forward to appropiate consumer.
+  typedef base::hash_map<WebDataService::Handle, IntentsQuery*> QueryMap;
+
+  // WebDataServiceConsumer implementation.
+  virtual void OnWebDataServiceRequestDone(WebDataService::Handle h,
+                                           const WDTypedResult* result);
+
+  // Map for all in-flight web data requests/intent queries.
+  QueryMap queries;
+
+  // Unique identifier for next intent query.
+  QueryID next_query_id_;
+
+  // Local reference to Web Data Service.
+  scoped_refptr<WebDataService> wds_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebIntentsRegistry);
+};
+
+#endif  // CHROME_BROWSER_INTENTS_WEB_INTENTS_REGISTRY_H_