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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 CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_IAPPS_DATA_PROVIDER_H_
#define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_IAPPS_DATA_PROVIDER_H_
#include <map>
#include <set>
#include <string>
#include "base/basictypes.h"
#include "base/callback_forward.h"
#include "base/files/file_path.h"
#include "base/files/file_path_watcher.h"
#include "base/memory/weak_ptr.h"
namespace iapps {
// This class is the holder for iTunes parsed data. Given a path to the iTunes
// library XML file it will read it in, parse the data, and provide convenient
// methods to access it. When the file changes, it will update the data.
// It is not thread safe, but can be run on any thread with IO access.
class IAppsDataProvider {
public:
typedef base::Callback<void(bool)> ReadyCallback;
explicit IAppsDataProvider(const base::FilePath& library_path);
virtual ~IAppsDataProvider();
// Ask the data provider to refresh the data if necessary. |ready_callback|
// will be called with the result; false if unable to parse the XML file.
virtual void RefreshData(const ReadyCallback& ready_callback);
// Get the platform path for the library XML file.
const base::FilePath& library_path() const;
protected:
bool valid() const;
// Subclass should set this to true if the last parse succeeded.
void set_valid(bool valid);
// Signal to subclass to parse the |library_path|. The |ready_callback|
// should be called when parsing has finished.
virtual void DoParseLibrary(const base::FilePath& library_path,
const ReadyCallback& ready_callback) = 0;
// Called when |library_path_| has changed. Virtual for testing.
virtual void OnLibraryChanged(const base::FilePath& path, bool error);
private:
// Called when the FilePathWatcher for |library_path_| has tried to add an
// watch.
void OnLibraryWatchStarted(scoped_ptr<base::FilePathWatcher> library_watcher);
// Path to the library XML file.
const base::FilePath library_path_;
// True if the data needs to be refreshed from disk.
bool needs_refresh_;
// True if |library_| contains valid data. False at construction and if
// reading or parsing the XML file fails.
bool is_valid_;
// A watcher on the library xml file.
scoped_ptr<base::FilePathWatcher> library_watcher_;
base::WeakPtrFactory<IAppsDataProvider> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(IAppsDataProvider);
};
} // namespace iapps
#endif // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_IAPPS_DATA_PROVIDER_H_
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