1 files changed, 138 insertions, 0 deletions
diff --git a/src/core/resource/ResourceUtils.cpp b/src/core/resource/ResourceUtils.cpp
new file mode 100644
index 0000000..7c42716
--- /dev/null
+++ b/src/core/resource/ResourceUtils.cpp
@@ -0,0 +1,138 @@
+/*
+    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/>.
+*/
+
+#include <core/common/Logger.hpp>
+#include <core/common/Rtti.hpp>
+#include <core/common/Utils.hpp>
+
+#include "ResourceUtils.hpp"
+
+namespace ousia {
+
+namespace RttiTypes {
+extern const Rtti Document;
+extern const Rtti Domain;
+extern const Rtti Node;
+extern const Rtti Typesystem;
+}
+
+/**
+ * Map mapping from relations (the "rel" attribute in includes) to the
+ * corresponding ResourceType.
+ */
+static const std::unordered_map<std::string, ResourceType> RelResourceTypeMap{
+    {"document", ResourceType::DOCUMENT},
+    {"domain", ResourceType::DOMAIN_DESC},
+    {"typesystem", ResourceType::TYPESYSTEM}};
+
+/**
+ * Map mapping from relations to the corresponding Rtti descriptor.
+ */
+static const std::unordered_map<std::string, const Rtti *> RelRttiTypeMap{
+    {"document", &RttiTypes::Document},
+    {"domain", &RttiTypes::Domain},
+    {"typesystem", &RttiTypes::Typesystem}};
+
+/**
+ * Map mapping from Rtti pointers to the corresponding ResourceType.
+ */
+static const std::unordered_map<const Rtti *, ResourceType> RttiResourceTypeMap{
+    {&RttiTypes::Document, ResourceType::DOCUMENT},
+    {&RttiTypes::Domain, ResourceType::DOMAIN_DESC},
+    {&RttiTypes::Typesystem, ResourceType::TYPESYSTEM}};
+
+ResourceType ResourceUtils::deduceResourceType(const std::string &rel,
+                                               const RttiSet &supportedTypes,
+                                               Logger &logger)
+{
+	ResourceType res;
+
+	// Try to deduce the ResourceType from the "rel" attribute
+	res = deduceResourceType(rel, logger);
+
+	// If this did not work, try to deduce the ResourceType from the
+	// supportedTypes supplied by the Parser instance.
+	if (res == ResourceType::UNKNOWN) {
+		res = deduceResourceType(supportedTypes, logger);
+	}
+	if (res == ResourceType::UNKNOWN) {
+		logger.note(
+		    "Ambigous resource type, consider specifying the \"rel\" "
+		    "attribute");
+	}
+	return res;
+}
+
+ResourceType ResourceUtils::deduceResourceType(const std::string &rel,
+                                               Logger &logger)
+{
+	std::string s = Utils::toLower(rel);
+	if (!s.empty()) {
+		auto it = RelResourceTypeMap.find(s);
+		if (it != RelResourceTypeMap.end()) {
+			return it->second;
+		} else {
+			logger.error(std::string("Unknown relation \"") + rel +
+			             std::string("\""));
+		}
+	}
+	return ResourceType::UNKNOWN;
+}
+
+ResourceType ResourceUtils::deduceResourceType(const RttiSet &supportedTypes,
+                                               Logger &logger)
+{
+	if (supportedTypes.size() == 1U) {
+		auto it = RttiResourceTypeMap.find(*supportedTypes.begin());
+		if (it != RttiResourceTypeMap.end()) {
+			return it->second;
+		}
+	}
+	return ResourceType::UNKNOWN;
+}
+
+const Rtti *ResourceUtils::deduceRttiType(const std::string &rel)
+{
+	std::string s = Utils::toLower(rel);
+	if (!s.empty()) {
+		auto it = RelRttiTypeMap.find(s);
+		if (it != RelRttiTypeMap.end()) {
+			return it->second;
+		}
+	}
+	return &RttiTypes::Node;
+}
+
+RttiSet ResourceUtils::limitRttiTypes(const RttiSet &supportedTypes,
+                                      const std::string &rel)
+{
+	return limitRttiTypes(supportedTypes, deduceRttiType(rel));
+}
+
+RttiSet ResourceUtils::limitRttiTypes(const RttiSet &supportedTypes,
+                                      const Rtti *type)
+{
+	RttiSet res;
+	for (const Rtti *supportedType : supportedTypes) {
+		if (supportedType->isa(*type)) {
+			res.insert(supportedType);
+		}
+	}
+	return res;
+}
+}