axmol/extensions/assets-manager/Manifest.h

/****************************************************************************
 Copyright (c) 2013 cocos2d-x.org
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

 http://www.cocos2d-x.org

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#ifndef __Manifest__
#define __Manifest__

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

#include "extensions/ExtensionMacros.h"
#include "extensions/ExtensionExport.h"
#include "network/CCDownloader.h"
#include "platform/CCFileUtils.h"

#include "rapidjson/document-wrapper.h"

NS_CC_EXT_BEGIN

struct DownloadUnit
{
    std::string srcUrl;
    std::string storagePath;
    std::string customId;
    float size;
};

struct ManifestAsset
{
    std::string md5;
    std::string path;
    bool compressed;
    float size;
    int downloadState;
};

typedef hlookup::string_map<DownloadUnit> DownloadUnits;

class CC_EX_DLL Manifest : public Ref
{
public:
    friend class AssetsManagerEx;

    //! The type of difference
    enum class DiffType
    {
        ADDED,
        DELETED,
        MODIFIED
    };

    enum DownloadState
    {
        UNSTARTED,
        DOWNLOADING,
        SUCCESSED,
        UNMARKED
    };

    //! Asset object
    typedef ManifestAsset Asset;

    //! 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.
     */
    std::string_view getPackageUrl() const;

    /** @brief Gets remote manifest file url.
     */
    std::string_view getManifestFileUrl() const;

    /** @brief Gets remote version file url.
     */
    std::string_view getVersionFileUrl() const;

    /** @brief Gets manifest version.
     */
    std::string_view getVersion() const;

    /** @brief Get the search paths list related to the Manifest.
     */
    std::vector<std::string> getSearchPaths() const;

protected:
    /** @brief Constructor for Manifest class
     * @param manifestUrl Url of the local manifest
     */
    Manifest(std::string_view manifestUrl = "");

    /** @brief Load the json file into local json object
     * @param url Url of the json file
     */
    void loadJson(std::string_view url);

    /** @brief Parse the version file information into this manifest
     * @param versionUrl Url of the local version file
     */
    void parseVersion(std::string_view versionUrl);

    /** @brief Parse the manifest file information into this manifest
     * @param manifestUrl Url of the local manifest
     */
    void parse(std::string_view manifestUrl);

    /** @brief Check whether the version of this manifest equals to another.
     * @param b   The other manifest
     * @return Equal or not
     */
    bool versionEquals(const Manifest* b) const;

    /** @brief Check whether the version of this manifest is greater than another.
     * @param b         The other manifest
     * @param [handle]  Customized comparasion handle function
     * @return Greater or not
     */
    bool versionGreater(
        const Manifest* b,
        const std::function<int(std::string_view versionA, std::string_view versionB)>& handle) const;

    /** @brief Generate difference between this Manifest and another.
     * @param b   The other manifest
     */
    hlookup::string_map<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(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(std::string_view filepath);

    Asset parseAsset(std::string_view path, const rapidjson::Value& json);

    void clear();

    /** @brief Gets all groups.
     */
    const std::vector<std::string>& getGroups() const;

    /** @brief Gets all groups version.
     */
    const hlookup::string_map<std::string>& getGroupVerions() const;

    /** @brief Gets version for the given group.
     * @param group   Key of the requested group
     */
    std::string_view getGroupVersion(std::string_view group) const;

    /**
     * @brief Gets assets.
     * @lua NA
     */
    const hlookup::string_map<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(std::string_view key, const DownloadState& state);

    void setManifestRoot(std::string_view root) { _manifestRoot = root; };

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]
    hlookup::string_map<std::string> _groupVer;

    //! The version of local engine
    std::string _engineVer;

    //! Full assets list
    hlookup::string_map<Asset> _assets;

    //! All search paths
    std::vector<std::string> _searchPaths;

    rapidjson::Document _json;
};

NS_CC_EXT_END
#endif /* defined(__Manifest__) */