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Diffstat (limited to 'src/core/resource/ResourceRequest.hpp')
-rw-r--r-- | src/core/resource/ResourceRequest.hpp | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/src/core/resource/ResourceRequest.hpp b/src/core/resource/ResourceRequest.hpp new file mode 100644 index 0000000..9d5728f --- /dev/null +++ b/src/core/resource/ResourceRequest.hpp @@ -0,0 +1,197 @@ +/* + Ousía + Copyright (C) 2014, 2015 Benjamin Paaßen, Andreas Stöckel + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +/** + * @file ResourceRequest.hpp + * + * Defines the ResourceRequest class used by the ResourceManager to deduce as + * much information as possible about a resource that was included by the user. + * + * @author Andreas Stöckel (astoecke@techfak.uni-bielefeld.de) + */ + +#ifndef _OUSIA_RESOURCE_REQUEST_HPP_ +#define _OUSIA_RESOURCE_REQUEST_HPP_ + +#include <string> + +#include <core/common/Rtti.hpp> +#include <core/resource/Resource.hpp> + +namespace ousia { + +// Forward declarations +class Logger; +class Parser; +class Registry; + +/** + * The ResourceRequest class contains user provided data about a Resource that + * should be opened and parsed. The ResourceRequest class can then be used to + * deduce missing information about the resource and finally to locate the + * Resource in the filesystem and to find a parser that is capable of parsing + * the Resource. + */ +class ResourceRequest { +private: + /** + * Requested path of the file that should be included. + */ + std::string path; + + /** + * Mimetype of the resource that should be parsed. + */ + std::string mimetype; + + /** + * Relation string specifing the relationship of the resource within the + * document it is included in. + */ + std::string rel; + + /** + * Specifies the types of the Node that may result from the resource once it + * has been parsed. + */ + RttiSet supportedTypes; + + /** + * Types the parser is expected to return. + */ + RttiSet parserTypes; + + /** + * ResourceType as deduced from the user provided values. + */ + ResourceType resourceType; + + /** + * Pointer at the Parser instance that may be used to parse the resource. + */ + Parser *parser; + +public: + /** + * Constructor of the ResourceRequest class. Takes the user provided data + * about the resource request. + * + * @param path is the requested path of the file that should be included. + * @param mimetype is the mimetype of the resource that should be parsed + * (may be empty, in which case the mimetype is deduced from the file + * extension) + * @param rel is a "relation string" supplied by the user which specifies + * the relationship of the specified resource within the document it is + * included in. + * @param supportedTypes specifies the types of the Node that may result + * from the resource once it has been parsed. This value is not directly + * provided by the user, but by the calling code. + */ + ResourceRequest(const std::string &path, const std::string &mimetype, + const std::string &rel, const RttiSet &supportedTypes); + + /** + * Tries to deduce all possible information and produces log messages for + * the user. + * + * @param registry from which registered parsers, mimetypes and file + * extensions are looked up. + * @param logger is the logger instance to which errors or warnings are + * logged. + * @return true if a parser has been found that could potentially be used to + * parse the file. + */ + bool deduce(Registry ®istry, Logger &logger); + + /** + * Tries to locate the specified resource. + * + * @param registry from which registered parsers, mimetypes and file + * extensions are looked up. + * @param logger is the logger instance to which errors or warnings are + * logged. + * @param resource is the Resource descriptor that should be filled with the + * actual location. + * @param relativeTo is another resource relative to which the Resource + * should be looked up. + * @return true if a resource was found, false otherwise. Equivalent to + * the value of resource.isValid(). + */ + bool locate(Registry ®istry, Logger &logger, Resource &resource, + const Resource &relativeTo = NullResource) const; + + /** + * Returns the requested path of the file that should be included. + * + * @param path given by the user (not the location of an actually found + * resource). + */ + const std::string &getPath() const { return path; } + + /** + * Returns the mimetype of the resource that should be parsed. + * + * @return the deduced mimetype. + */ + const std::string &getMimetype() const { return mimetype; } + + /** + * Returns the relation string which specifies the relationship of the + * resource within the document it is included in. + * + * @return the deduced relation string. + */ + const std::string &getRel() const { return rel; } + + /** + * Returns the types of the Node that may result from the resource once it + * has been parsed. Restricted to the types that may actually returned by + * the parser. + * + * @return the deduced supported types. + */ + const RttiSet &getSupportedTypes() const { return supportedTypes; } + + /** + * Returns the ResourceType as deduced from the user provided values. + * + * @return deduced ResourceType or ResourceType::UNKNOWN if none could be + * deduced. + */ + ResourceType getResourceType() const { return resourceType; } + + /** + * Returns the parser that was deduced according to the given resource + * descriptors. + * + * @return the pointer at the parser instance or nullptr if none was found. + */ + Parser *getParser() const { return parser; } + + /** + * Returns the types the parser may return or an empty set if no parser was + * found. + * + * @return the types the parser may return. + */ + RttiSet getParserTypes() const { return parserTypes; } +}; +} + +#endif /* _OUSIA_RESOURCE_REQUEST_HPP_ */ + |