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// 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.
#ifndef CHROME_BROWSER_UI_WEBUI_NTP_SUGGESTIONS_COMBINER_H_
#define CHROME_BROWSER_UI_WEBUI_NTP_SUGGESTIONS_COMBINER_H_
#pragma once
#include <vector>
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/scoped_vector.h"
class SuggestionsHandler;
class SuggestionsSource;
class Profile;
namespace base {
class ListValue;
}
// Combines many different sources of suggestions and generates data from it.
class SuggestionsCombiner {
public:
// Interface to be implemented by classes that will be notified of events from
// the SuggestionsCombiner.
class Delegate {
public:
virtual ~Delegate() {}
// Method that is called when new suggestions are ready from the
// SuggestionsCombiner.
virtual void OnSuggestionsReady() = 0;
};
explicit SuggestionsCombiner(SuggestionsCombiner::Delegate* delegate);
virtual ~SuggestionsCombiner();
// Add a new source. The SuggestionsCombiner takes ownership of |source|.
void AddSource(SuggestionsSource* source);
// Fetch a new set of items from the various suggestion sources.
void FetchItems(Profile* profile);
base::ListValue* GetPageValues();
// Called by a source when its items are ready. Make sure suggestion sources
// call this method exactly once for each call to
// SuggestionsSource::FetchItems.
void OnItemsReady();
void SetSuggestionsCount(size_t suggestions_count);
private:
// Fill the page values from the suggestion sources so they can be sent to
// the JavaScript side. This should only be called when all the suggestion
// sources have items ready.
void FillPageValues();
typedef ScopedVector<SuggestionsSource> SuggestionsSources;
// List of all the suggestions sources that will be combined to generate a
// single list of suggestions.
SuggestionsSources sources_;
// Counter tracking the number of sources that are currently asynchronously
// fetching their data.
int sources_fetching_count_;
// The delegate to notify once items are ready.
SuggestionsCombiner::Delegate* delegate_;
// Number of suggestions to generate. Used to distribute the suggestions
// between the various sources.
size_t suggestions_count_;
// Informations to send to the javascript side.
scoped_ptr<base::ListValue> page_values_;
DISALLOW_COPY_AND_ASSIGN(SuggestionsCombiner);
};
#endif // CHROME_BROWSER_UI_WEBUI_NTP_SUGGESTIONS_COMBINER_H_
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