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112 lines
2.9 KiB
C++
112 lines
2.9 KiB
C++
/*
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* ISimpleResourceLoader.h, part of VCMI engine
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*
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* Authors: listed in file AUTHORS in main folder
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*
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* License: GNU General Public License v2.0 or later
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* Full text of license available in license.txt file, in main folder
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*
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*/
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#pragma once
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VCMI_LIB_NAMESPACE_BEGIN
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class CInputStream;
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class ResourceID;
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/**
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* A class which knows the files containing in the archive or system and how to load them.
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*/
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class DLL_LINKAGE ISimpleResourceLoader
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{
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public:
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virtual ~ISimpleResourceLoader() { };
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/**
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* Loads a resource with the given resource name.
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*
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* @param resourceName The unqiue resource name in space of the archive.
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* @return a input stream object
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*/
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virtual std::unique_ptr<CInputStream> load(const ResourceID & resourceName) const = 0;
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/**
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* Checks if the entry exists.
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*
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* @return Returns true if the entry exists, false if not.
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*/
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virtual bool existsResource(const ResourceID & resourceName) const = 0;
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/**
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* Gets mount point to which this loader was attached
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*
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* @return mount point URI
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*/
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virtual std::string getMountPoint() const = 0;
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/**
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* Gets full name of resource, e.g. name of file in filesystem.
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*
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* @return path or empty optional if file can't be accessed independently (e.g. file in archive)
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*/
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virtual std::optional<boost::filesystem::path> getResourceName(const ResourceID & resourceName) const
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{
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return std::optional<boost::filesystem::path>();
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}
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/**
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* Gets all full names of matching resources, e.g. names of files in filesystem.
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*
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* @return std::set with names.
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*/
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virtual std::set<boost::filesystem::path> getResourceNames(const ResourceID & resourceName) const
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{
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std::set<boost::filesystem::path> result;
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auto rn = getResourceName(resourceName);
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if(rn)
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{
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result.insert(rn->string());
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}
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return result;
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}
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/**
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* Update lists of files that match filter function
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*
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* @param filter Filter that returns true if specified mount point matches filter
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*/
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virtual void updateFilteredFiles(std::function<bool(const std::string &)> filter) const = 0;
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/**
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* Get list of files that match filter function
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*
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* @param filter Filter that returns true if specified ID matches filter
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* @return Returns list of flies
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*/
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virtual std::unordered_set<ResourceID> getFilteredFiles(std::function<bool(const ResourceID &)> filter) const = 0;
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/**
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* Creates new resource with specified filename.
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*
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* @return true if new file was created, false on error or if file already exists
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*/
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virtual bool createResource(std::string filename, bool update = false)
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{
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return false;
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}
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/**
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* @brief Returns all loaders that have resource with such name
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*
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* @return vector with all loaders
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*/
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virtual std::vector<const ISimpleResourceLoader *> getResourcesWithName(const ResourceID & resourceName) const
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{
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if (existsResource(resourceName))
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return std::vector<const ISimpleResourceLoader *>(1, this);
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return std::vector<const ISimpleResourceLoader *>();
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}
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};
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VCMI_LIB_NAMESPACE_END
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