First working version with some test executables

include/utils/jsonschema/JsonFactory.h

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+#pragma once
+
+#include <string>
+#include <istream>
+#include <fstream>
+#include <stdexcept>
+#include <sstream>
+
+// JSON-Schema includes
+#include <utils/jsonschema/JsonSchemaChecker.h>
+
+class JsonFactory
+{
+public:
+
+	static int load(const std::string& schema, const std::istream& config, Json::Value json);
+
+	static int load(const std::string& schema, const std::string& config, Json::Value& json)
+	{
+		// Load the schema and the config trees
+		Json::Value schemaTree = readJson(schema);
+		Json::Value configTree = readJson(config);
+
+		// create the validator
+		JsonSchemaChecker schemaChecker;
+		schemaChecker.setSchema(schemaTree);
+
+		bool valid = schemaChecker.validate(configTree);
+		for (const std::string& message : schemaChecker.getMessages())
+		{
+			std::cout << message << std::endl;
+		}
+		if (!valid)
+		{
+			std::cerr << "Validation failed for configuration file: " << config.c_str() << std::endl;
+			return -3;
+		}
+
+		json = configTree;
+		return 0;
+	}
+
+	static Json::Value readJson(const std::string& filename)
+	{
+		// Open the file input stream
+		std::ifstream ifs(filename.c_str());
+		return readJson(ifs);
+	}
+
+	static Json::Value readJson(std::istream& stream)
+	{
+		// will contains the root value after parsing.
+		Json::Value jsonTree;
+
+		Json::Reader reader;
+		if (! reader.parse(stream, jsonTree, false))
+		{
+			// report to the user the failure and their locations in the document.
+			std::stringstream sstream;
+			sstream << "Failed to parse configuration: " << reader.getFormattedErrorMessages().c_str();
+
+			throw std::runtime_error(sstream.str());
+		}
+		return jsonTree;
+	}
+};

include/utils/jsonschema/JsonSchemaChecker.h

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+// Copyright (c) 2012 TNO, The Netherlands.
+//
+// This file contains information proprietary to TNO.
+//
+// Any disclosure or use of this information or any reproduction of this document or any part thereof for
+// other than the specified purpose for which it is intended is expressly prohibited except as TNO may
+// otherwise agree to in writing.
+
+#pragma once
+
+// stl includes
+#include <string>
+#include <list>
+
+// jsoncpp includes
+#include <json/json.h>
+
+/**
+ * JsonSchemaChecker is a very basic implementation of json schema.
+ * The json schema definition draft can be found at
+ * http://tools.ietf.org/html/draft-zyp-json-schema-03
+ *
+ * The following keywords are supported:
+ * - type
+ * - required
+ * - properties
+ * - items
+ * - enum
+ * - minimum
+ * - maximum
+ */
+class JsonSchemaChecker
+{
+public:
+	JsonSchemaChecker();
+	virtual ~JsonSchemaChecker();
+
+	bool setSchema(const Json::Value & schema);
+
+	bool validate(const Json::Value & value);
+
+	const std::list<std::string> & getMessages() const;
+
+private:
+	void collectReferences(const Json::Value & schema);
+
+	void validate(const Json::Value &value, const Json::Value & schema);
+
+	void setMessage(const std::string & message);
+
+	void collectDependencies(const Json::Value & value, const Json::Value &schema);
+
+private:
+	// attribute check functions
+	void checkType(const Json::Value & value, const Json::Value & schema);
+	void checkProperties(const Json::Value & value, const Json::Value & schema);
+	void checkAdditionalProperties(const Json::Value & value, const Json::Value & schema, const Json::Value::Members & ignoredProperties);
+	void checkDependencies(const Json::Value & value, const Json::Value & schemaLink);
+	void checkMinimum(const Json::Value & value, const Json::Value & schema);
+	void checkMaximum(const Json::Value & value, const Json::Value & schema);
+	void checkItems(const Json::Value & value, const Json::Value & schema);
+	void checkMinItems(const Json::Value & value, const Json::Value & schema);
+	void checkMaxItems(const Json::Value & value, const Json::Value & schema);
+	void checkUniqueItems(const Json::Value & value, const Json::Value & schema);
+	void checkEnum(const Json::Value & value, const Json::Value & schema);
+
+private:
+	Json::Value _schema;
+
+	std::list<std::string> _currentPath;
+	std::list<std::string> _messages;
+	bool _error;
+
+	std::map<std::string, const Json::Value *> _references; // ref 2 value
+};