PrismLauncher/logic/news/NewsChecker.h

/* Copyright 2013-2015 MultiMC Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once

#include <QObject>
#include <QString>
#include <QList>

#include <logic/net/NetJob.h>

#include "NewsEntry.h"

class NewsChecker : public QObject
{
	Q_OBJECT
public:
	/*!
	 * Constructs a news reader to read from the given RSS feed URL.
	 */
	NewsChecker(const QString& feedUrl);
	
	/*!
	 * Returns the error message for the last time the news was loaded.
	 * Empty string if the last load was successful.
	 */
	QString getLastLoadErrorMsg() const;

	/*!
	 * Returns true if the news has been loaded successfully.
	 */
	bool isNewsLoaded() const;
	
	//! True if the news is currently loading. If true, reloadNews() will do nothing.
	bool isLoadingNews() const;

	/*!
	 * Returns a list of news entries.
	 */
	QList<NewsEntryPtr> getNewsEntries() const;

	/*!
	 * Reloads the news from the website's RSS feed.
	 * If the news is already loading, this does nothing.
	 */
	void Q_SLOT reloadNews();

signals:
	/*!
	 * Signal fired after the news has finished loading.
	 */
	void newsLoaded();

	/*!
	 * Signal fired after the news fails to load.
	 */
	void newsLoadingFailed(QString errorMsg);

protected slots:
	void rssDownloadFinished();
	void rssDownloadFailed();

protected:
	//! The URL for the RSS feed to fetch.
	QString m_feedUrl;

	//! List of news entries.
	QList<NewsEntryPtr> m_newsEntries;

	//! The network job to use to load the news.
	NetJobPtr m_newsNetJob;

	//! True if news has been loaded.
	bool m_loadedNews;

	/*!
	 * Gets the error message that was given last time the news was loaded.
	 * If the last news load succeeded, this will be an empty string.
	 */
	QString m_lastLoadError;

	
	/*!
	 * Emits newsLoaded() and sets m_lastLoadError to empty string.
	 */
	void Q_SLOT succeed();

	/*!
	 * Emits newsLoadingFailed() and sets m_lastLoadError to the given message.
	 */
	void Q_SLOT fail(const QString& errorMsg);
};