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// Copyright 2013 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 COMPONENTS_DOM_DISTILLER_CORE_DISTILLER_H_
#define COMPONENTS_DOM_DISTILLER_CORE_DISTILLER_H_
#include <map>
#include <string>
#include "base/callback.h"
#include "base/gtest_prod_util.h"
#include "base/memory/ref_counted.h"
#include "base/values.h"
#include "components/dom_distiller/core/distiller_page.h"
#include "components/dom_distiller/core/distiller_url_fetcher.h"
#include "components/dom_distiller/core/proto/distilled_page.pb.h"
#include "net/url_request/url_request_context_getter.h"
#include "url/gurl.h"
namespace dom_distiller {
class DistillerImpl;
class Distiller {
public:
typedef base::Callback<void(
scoped_ptr<DistilledPageProto>)> DistillerCallback;
virtual ~Distiller() {}
// Distills a page, and asynchrounously returns the article HTML to the
// supplied callback.
virtual void DistillPage(const GURL& url,
const DistillerCallback& callback) = 0;
};
class DistillerFactory {
public:
virtual scoped_ptr<Distiller> CreateDistiller() = 0;
virtual ~DistillerFactory() {}
};
// Factory for creating a Distiller.
class DistillerFactoryImpl : public DistillerFactory {
public:
DistillerFactoryImpl(
scoped_ptr<DistillerPageFactory> distiller_page_factory,
scoped_ptr<DistillerURLFetcherFactory> distiller_url_fetcher_factory);
virtual ~DistillerFactoryImpl();
virtual scoped_ptr<Distiller> CreateDistiller() OVERRIDE;
private:
scoped_ptr<DistillerPageFactory> distiller_page_factory_;
scoped_ptr<DistillerURLFetcherFactory> distiller_url_fetcher_factory_;
};
// Distills a article from a page and associated pages.
class DistillerImpl : public Distiller,
public DistillerPage::Delegate {
public:
DistillerImpl(
const DistillerPageFactory& distiller_page_factory,
const DistillerURLFetcherFactory& distiller_url_fetcher_factory);
virtual ~DistillerImpl();
// Creates an execution context. This must be called once before any calls are
// made to distill the page.
virtual void Init();
virtual void DistillPage(const GURL& url,
const DistillerCallback& callback) OVERRIDE;
// PageDistillerContext::Delegate
virtual void OnLoadURLDone() OVERRIDE;
virtual void OnExecuteJavaScriptDone(const base::Value* value) OVERRIDE;
void OnFetchImageDone(const std::string& id, const std::string& response);
private:
virtual void LoadURL(const GURL& url);
virtual void FetchImage(const std::string& image_id, const std::string& item);
// Injects JavaScript to distill a loaded page down to its important content,
// e.g., extracting a news article from its surrounding boilerplate.
void GetDistilledContent();
const DistillerPageFactory& distiller_page_factory_;
const DistillerURLFetcherFactory& distiller_url_fetcher_factory_;
scoped_ptr<DistillerPage> distiller_page_;
DistillerCallback distillation_cb_;
std::map<std::string, DistillerURLFetcher* > image_fetchers_;
scoped_ptr<DistilledPageProto> proto_;
DISALLOW_COPY_AND_ASSIGN(DistillerImpl);
};
} // namespace dom_distiller
#endif // COMPONENTS_DOM_DISTILLER_CORE_DISTILLER_H_
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