axmol/extensions/assets-manager/Manifest.h

/****************************************************************************
 Copyright (c) 2013 cocos2d-x.org
 
 http://www.cocos2d-x.org
 
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 of this software and associated documentation files (the "Software"), to deal
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 all copies or substantial portions of the Software.
 
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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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 THE SOFTWARE.
 ****************************************************************************/

#ifndef __Manifest__
#define __Manifest__

#include "extensions/ExtensionMacros.h"
#include "extensions/ExtensionExport.h"
#include "Downloader.h"

#include <string>
#include <unordered_map>
#include <vector>

#include "json/document.h"

NS_CC_EXT_BEGIN


class CC_EX_DLL Manifest : public Ref
{
public:
    
    friend class AssetsManagerEx;
    
    //! The type of difference
    enum class DiffType {
        ADDED,
        DELETED,
        MODIFIED
    };
    
    enum class DownloadState {
        UNSTARTED,
        DOWNLOADING,
        SUCCESSED
    };
    
    //! Asset object
    struct Asset {
        std::string md5;
        std::string path;
        bool compressed;
        DownloadState downloadState;
    };
    
    //! Object indicate the difference between two Assets
    struct AssetDiff {
        Asset asset;
        DiffType type;
    };
    
    /** @brief Check whether the version informations have been fully loaded
     */
    bool isVersionLoaded() const;
    
    /** @brief Check whether the manifest have been fully loaded
     */
    bool isLoaded() const;
    
    /** @brief Gets remote package url.
     */
    const std::string& getPackageUrl() const;
    
    /** @brief Gets remote manifest file url.
     */
    const std::string& getManifestFileUrl() const;
    
    /** @brief Gets remote version file url.
     */
    const std::string& getVersionFileUrl() const;
    
    /** @brief Gets manifest version.
     */
    const std::string& getVersion() const;
    
    /** @brief Get the search paths list related to the Manifest.
     */
    std::vector<std::string> getSearchPaths();
    
protected:
    
    /** @brief Constructor for Manifest class
     * @param manifestUrl Url of the local manifest
     */
    Manifest(const std::string& manifestUrl = "");
    
    /** @brief Load the json file into local json object
     * @param url Url of the json file
     */
    void loadJson(const std::string& url);
    
    /** @brief Parse the version file information into this manifest
     * @param versionUrl Url of the local version file
     */
    void parseVersion(const std::string& versionUrl);
    
    /** @brief Parse the manifest file information into this manifest
     * @param manifestUrl Url of the local manifest
     */
    void parse(const std::string& manifestUrl);
    
    /** @brief Check whether the version of this manifest equals to another.
     * @param b   The other manifest
     */
    bool versionEquals(const Manifest *b) const;
    
    /** @brief Generate difference between this Manifest and another.
     * @param b   The other manifest
     */
    std::unordered_map<std::string, AssetDiff> genDiff(const Manifest *b) const;
    
    /** @brief Generate resuming download assets list
     * @param units   The download units reference to be modified by the generation result
     */
    void genResumeAssetsList(Downloader::DownloadUnits *units) const;
    
    /** @brief Prepend all search paths to the FileUtils.
     */
    void prependSearchPaths();
    
    void loadVersion(const rapidjson::Document &json);
    
    void loadManifest(const rapidjson::Document &json);
    
    void saveToFile(const std::string &filepath);
    
    Asset parseAsset(const std::string &path, const rapidjson::Value &json);
    
    void clear();
    
    /** @brief Gets all groups.
     */
    const std::vector<std::string>& getGroups() const;
    
    /** @brief Gets all groups version.
     */
    const std::unordered_map<std::string, std::string>& getGroupVerions() const;
    
    /** @brief Gets version for the given group.
     * @param group   Key of the requested group
     */
    const std::string& getGroupVersion(const std::string &group) const;
    
    /** @brief Gets assets.
     */
    const std::unordered_map<std::string, Asset>& getAssets() const;
    
    /** @brief Set the download state for an asset
     * @param key   Key of the asset to set
     * @param state The current download state of the asset
     */
    void setAssetDownloadState(const std::string &key, const DownloadState &state);
    
private:
    
    //! Indicate whether the version informations have been fully loaded
    bool _versionLoaded;
    
    //! Indicate whether the manifest have been fully loaded
    bool _loaded;
    
    //! Reference to the global file utils
    FileUtils *_fileUtils;
    
    //! The local manifest root
    std::string _manifestRoot;
    
    //! The remote package url
    std::string _packageUrl;
    
    //! The remote path of manifest file
    std::string _remoteManifestUrl;
    
    //! The remote path of version file [Optional]
    std::string _remoteVersionUrl;
    
    //! The version of local manifest
    std::string _version;
    
    //! All groups exist in manifest [Optional]
    std::vector<std::string> _groups;
    
    //! The versions of all local group [Optional]
    std::unordered_map<std::string, std::string> _groupVer;
    
    //! The version of local engine
    std::string _engineVer;
    
    //! Full assets list
    std::unordered_map<std::string, Asset> _assets;
    
    //! All search paths
    std::vector<std::string> _searchPaths;
    
    rapidjson::Document _json;
};

NS_CC_EXT_END
#endif /* defined(__Manifest__) */