Made Attribute class mutable

2 files changed, 142 insertions, 43 deletions

diff --git a/src/core/model/Typesystem.cpp b/src/core/model/Typesystem.cpp
index a3d354c..13bb38c 100644
--- a/src/core/model/Typesystem.cpp
+++ b/src/core/model/Typesystem.cpp
@@ -149,11 +149,67 @@ EnumType::Ordinal EnumType::valueOf(const std::string &name) const
 
 /* Class Attribute */
 
+Attribute::Attribute(Manager &mgr, std::string name, Handle<Type> type,
+                     Variant defaultValue, bool optional)
+    : Node(mgr, std::move(name)),
+      type(acquire(type)),
+      rawDefaultValue(defaultValue),
+      optional(optional)
+{
+	ExceptionLogger logger;
+	initialize(logger);
+}
+
+Attribute::Attribute(Manager &mgr, std::string name, Handle<Type> type)
+    : Attribute(mgr, name, type, Variant{}, false)
+{
+}
+
+Attribute::Attribute(Manager &mgr, std::string name, Variant defaultValue,
+                     bool optional)
+    : Attribute(mgr, name, new UnknownType(mgr), defaultValue, optional)
+{
+}
+
+void Attribute::initialize(Logger &logger)
+{
+	if (optional) {
+		defaultValue = rawDefaultValue;
+		type->build(defaultValue, logger);
+	}
+}
+
 bool Attribute::doValidate(Logger &logger) const
 {
 	return validateName(logger);
 }
 
+void Attribute::setDefaultValue(const Variant &defaultValue, Logger &logger)
+{
+	invalidate();
+
+	rawDefaultValue = defaultValue;
+	optional = true;
+	initialize(logger);
+}
+
+void Attribute::removeDefaultValue()
+{
+	invalidate();
+
+	rawDefaultValue = nullptr;
+	defaultValue = nullptr;
+	optional = false;
+}
+
+void Attribute::setType(Handle<Type> type, Logger &logger)
+{
+	invalidate();
+
+	this->type = acquire(type);
+	initialize(logger);
+}
+
 /* Class StructType */
 
 bool StructType::resolveIndexKey(const std::string &key, size_t &idx) const
@@ -195,8 +251,8 @@ bool StructType::insertDefaults(Variant &data, const std::vector<bool> &set,
 	Variant::arrayType &arr = data.asArray();
 	for (size_t a = 0; a < arr.size(); a++) {
 		if (!set[a]) {
-			if (attributes[a]->optional) {
-				arr[a] = attributes[a]->defaultValue;
+			if (attributes[a]->isOptional()) {
+				arr[a] = attributes[a]->getDefaultValue();
 			} else {
 				ok = false;
 				arr[a] = attributes[a]->getType()->create();
@@ -333,7 +389,7 @@ bool StructType::doValidate(Logger &logger) const
 
 Rooted<StructType> StructType::createValidated(
     Manager &mgr, std::string name, Handle<Typesystem> system,
-    Handle<StructType> parentStructure, NodeVector<Attribute> attributes,
+    Handle<StructType> parentStructure, const NodeVector<Attribute> &attributes,
     Logger &logger)
 {
 	Rooted<StructType> structType{new StructType(mgr, name, system)};
@@ -355,6 +411,16 @@ void StructType::setParentStructure(Handle<StructType> parentStructure,
 	initialize(logger);
 }
 
+Rooted<Attribute> StructType::createAttribute(const std::string &name,
+                                              Variant defaultValue,
+                                              bool optional, Logger &logger)
+{
+	Rooted<Attribute> attribute =
+	    new Attribute(getManager(), name, defaultValue, optional);
+	addAttribute(attribute, logger);
+	return attribute;
+}
+
 void StructType::addAttribute(Handle<Attribute> attribute, Logger &logger,
                               bool fromInitialize)
 {
@@ -398,8 +464,8 @@ Variant StructType::create() const
 	Variant::arrayType arr;
 	arr.resize(attributes.size());
 	for (size_t idx = 0; idx < attributes.size(); idx++) {
-		if (attributes[idx]->optional) {
-			arr[idx] = attributes[idx]->defaultValue;
+		if (attributes[idx]->isOptional()) {
+			arr[idx] = attributes[idx]->getDefaultValue();
 		} else {
 			arr[idx] = attributes[idx]->getType()->create();
 		}
diff --git a/src/core/model/Typesystem.hpp b/src/core/model/Typesystem.hpp
index 64922f0..a4a679d 100644
--- a/src/core/model/Typesystem.hpp
+++ b/src/core/model/Typesystem.hpp
@@ -368,18 +368,6 @@ public:
  */
 class Attribute : public Node {
 private:
-
-
-protected:
-	/**
-	 * Returns true if the name of the Attribute is a valid identifier.
-	 *
-	 * @param logger is the logger instance to which validation errors are
-	 * logged.
-	 */
-	bool doValidate(Logger &logger) const override;
-
-public:
 	/**
 	 * Reference to the actual type of the attribute.
 	 */
@@ -402,6 +390,25 @@ public:
 	bool optional;
 
 	/**
+	 * Reinitializes the default value from the raw default value with the
+	 * current type.
+	 *
+	 * @param logger is the logger instance to which errors while building the
+	 * default value should be passed.
+	 */
+	void initialize(Logger &logger);
+
+protected:
+	/**
+	 * Returns true if the name of the Attribute is a valid identifier.
+	 *
+	 * @param logger is the logger instance to which validation errors are
+	 * logged.
+	 */
+	bool doValidate(Logger &logger) const override;
+
+public:
+	/**
 	 * Constructor of the Attribute class.
 	 *
 	 * @param mgr is the Manager instance to be used for the Node.
@@ -414,13 +421,7 @@ public:
 	 * be used.
 	 */
 	Attribute(Manager &mgr, std::string name, Handle<Type> type,
-	          Variant defaultValue, bool optional = true)
-	    : Node(mgr, std::move(name)),
-	      type(acquire(type)),
-	      defaultValue(defaultValue),
-	      optional(optional)
-	{
-	}
+	          Variant defaultValue, bool optional = true);
 
 	/**
 	 * Constructor of the Attribute class with no default value.
@@ -428,14 +429,22 @@ public:
 	 * @param mgr is the Manager instance to be used for the Node.
 	 * @param type holds a reference to the type descriptor holding the type
 	 * of the attribute.
+	 * @param name is the name of the Attribute. Should be a valid identifier.
 	 */
-	Attribute(Manager &mgr, std::string name, Handle<Type> type)
-	    : Node(mgr, std::move(name)),
-	      type(acquire(type)),
-	      defaultValue(nullptr),
-	      optional(false)
-	{
-	}
+	Attribute(Manager &mgr, std::string name, Handle<Type> type);
+
+	/**
+	 * Constructor of the Attribute class with default value but unknown type.
+	 *
+	 * @param mgr is the Manager instance to be used for the Node.
+	 * @param name is the name of the Attribute. Should be a valid identifier.
+	 * @param defaultValue is the default value of the attribute and must have
+	 * been passed through the build of the specified type.
+	 * @param optional should be set to true if the if the default value should
+	 * be used.
+	 */
+	Attribute(Manager &mgr, std::string name, Variant defaultValue,
+	          bool optional);
 
 	/**
 	 * Sets a new default value. This makes the Attribute optional. The given
@@ -454,7 +463,7 @@ public:
 	 * @return the default value of the attribute. If no default value has been
 	 * given a null variant is returned (the opposite does not hold).
 	 */
-	Variant getDefaultValue() const;
+	Variant getDefaultValue() const { return defaultValue; }
 
 	/**
 	 * Removes any default value from the attribute, making this attribute
@@ -468,7 +477,7 @@ public:
 	 *
 	 * @return true if the attribute is optional, false otherwise.
 	 */
-	bool isOptional() const {return optional; }
+	bool isOptional() const { return optional; }
 
 	/**
 	 * Sets the type of the attribute to the specified value. This will
@@ -653,9 +662,24 @@ public:
 	{
 	}
 
+	/**
+	 * Creates a new instance of the StructType class and checks the given
+	 * parameters for validity.
+	 *
+	 * @param mgr is the underlying Manager instance.
+	 * @param name is the name of the EnumType instance. Should be a valid
+	 * identifier.
+	 * @param system is a reference to the parent Typesystem instance.
+	 * @param parentStructure is a reference to the StructType this type is
+	 * derived from, may be nullptr.
+	 * @param attributes is a vector containing the struct type attributes.
+	 * The attributes are checked for validity (their names must be a valid
+	 * identifiers) and uniqueness (each value must exist exactly once).
+	 * @param logger is the Logger instance into which errors should be written.
+	 */
 	static Rooted<StructType> createValidated(
 	    Manager &mgr, std::string name, Handle<Typesystem> system,
-	    Handle<StructType> parentStructure, NodeVector<Attribute> attributes,
+	    Handle<StructType> parentStructure, const NodeVector<Attribute> &attributes,
 	    Logger &logger);
 
 	/**
@@ -674,8 +698,23 @@ public:
 	void setParentStructure(Handle<StructType> parentStructure, Logger &logger);
 
 	/**
-	 * Adds an attribute. Throws an exception if the name of the attribute is
-	 * not unique.
+	 * Creates a new attribute with unknown type and adds it to the attribute
+	 * list.
+	 *
+	 * @param name is the name of the attribute.
+	 * @param defaultValue is the default value of the attribute.
+	 * @param optional specifies whether the attribute is optional or not.
+	 * @param logger is the logger instance to which errors while creating or
+	 * adding the attribute should be logged.
+	 * @return a new instance of the Attribute class.
+	 */
+	Rooted<Attribute> createAttribute(const std::string &name,
+	                                  Variant defaultValue, bool optional,
+	                                  Logger &logger);
+
+	/**
+	 * Adds an attribute. Throws an exception if the name of the attribute
+	 * is not unique.
 	 *
 	 * @param attribute is the attribute descriptor that should be added to the
 	 * internal attribute list.
@@ -828,13 +867,8 @@ public:
 	 * (yet) resolved type.
 	 *
 	 * @param mgr is the Manager instance to be used for the Node.
-	 * @param name is the name of the unresolved type which may be used later
-	 * to perform a complete resolution.
 	 */
-	UnknownType(Manager &mgr, std::string name)
-	    : Type(mgr, std::move(name), nullptr, false)
-	{
-	}
+	UnknownType(Manager &mgr) : Type(mgr, "unknown", nullptr, false) {}
 
 	/**
 	 * Returns a nullptr variant.
@@ -912,7 +946,6 @@ private:
 	NodeVector<Constant> constants;
 
 protected:
-
 	void doResolve(ResolutionState &state) override;
 
 	bool doValidate(Logger &logger) const override;