axmol/extensions/AssetsManager/AssetsManager.h

/****************************************************************************
 Copyright (c) 2013 cocos2d-x.org
 
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#ifndef __AssetsManager__
#define __AssetsManager__

#include <string>
#include <curl/curl.h>

class AssetsManagerDelegate;

/* 
 *  This class is used to auto update resources, such as pictures or scripts.
 *  The updated package should be a zip file. And there should be a file named
 *  version in the server, which contains version code.
 */
class AssetsManager
{
public:
    enum ErrorCode
    {
        ServerNotAvailable,    /** server address error or timeout */
        TimeOut,
    };
    
    //! Default constructor. You should set server address later.
    AssetsManager();
    
    /* @brief Creates a AssetsManager with new package url and version code url.
     *        AssetsManager will use the value returned by CCFileUtils::getWritablePath() as storage path.
     *
     * @param packageUrl URL of new package, the package should be a zip file.
     * @param versionFileUrl URL of version file. It should contain version code of new package.
     */
    AssetsManager(const char* packageUrl, const char* versionFileUrl);
    
    /* @brief Creates a AssetsManager with new package url, version code url and storage path.
     *
     * @param packageUrl URL of new package, the package should be a zip file.
     * @param versionFileUrl URL of version file. It should contain version code of new package.
     * @param storagePath The path to store downloaded resources.
     */
    AssetsManager(const char* packageUrl, const char* versionFileUrl, const char* storagePath);
    
    /* @brief Check out if there is a new version resource.
     *        You may use this method before updating, then let user determine whether
     *        he wants to update resources.
     */
    virtual bool checkUpdate();
    
    /* @brief Download new package if there is a new version, and uncompress downloaded zip file.
     *        Ofcourse it will set search path that stores downloaded files.
     */
    virtual void update();
    
    /* @brief Gets url of package.
     */
    const char* getPackageUrl() const;
    
    /* @brief Sets package url.
     */
    void setPackageUrl(const char* packageUrl);
    
    /* @brief Gets version file url.
     */
    const char* getVersionFileUrl() const;
    
    /* @brief Gets version file url.
     */
    void setVersionFileUrl(const char* versionFileUrl);
    
    /* @brief Gets current version code.
     */
    std::string getVersion();
    
    /* @brief Deletes recorded version code.
     */
    void deleteVersion();
    
    /* @brief Gets storage path.
     */
    const char* getStoragePath() const;
    
    /* @brief Sets storage path.
     *
     * @param storagePath The path to store downloaded resources.
     * @warm The path should be a valid path.
     */
    void setStoragePath(const char* storagePath);
    
protected:
    bool downLoad();
    void checkStoragePath();
    bool uncompress();
    bool createDirectory(const char *path);
    void setSearchPath();
    
private:
    //! The path to store downloaded resources.
    std::string _storagePath;
    
    //! The version of downloaded resources.
    std::string _version;
    
    std::string _packageUrl;
    std::string _versionFileUrl;
    
    AssetsManagerDelegate* _delegate;
    
    CURL *_curl;
};

/* @brief This class is used as base class of the delegate of AssetsManager.
 */
class AssetsManagerDelegate
{
public:
    /* @brief When an error happens in updating resources, AssetsManager will invoke its delegate's onError().
     *
     * @param errorCode The pointer to record error code.
     *                  The value will be set by AssetsManager.
     */
    virtual void onError(AssetsManager::ErrorCode* errorCode) = 0;
    
    virtual void onUpdate(float* percent) = 0;
};


#endif /* defined(__AssetsManager__) */