From d3c4db8f3444c8531cb5a02ce3c95d5673ffb1a5 Mon Sep 17 00:00:00 2001
From: Andrew <forkk@forkk.net>
Date: Mon, 18 Feb 2013 15:39:01 -0600
Subject: [PATCH] Implemented instance loader.

---
 data/inst/instanceloader.cpp | 60 ++++++++++++++++++++++++++++++++++++
 data/inst/instanceloader.h   | 25 ++++++++++++++-
 data/inst/instancetype.h     |  8 +++--
 3 files changed, 90 insertions(+), 3 deletions(-)

diff --git a/data/inst/instanceloader.cpp b/data/inst/instanceloader.cpp
index 59fed951..bc43c061 100644
--- a/data/inst/instanceloader.cpp
+++ b/data/inst/instanceloader.cpp
@@ -15,7 +15,67 @@
 
 #include "instanceloader.h"
 
+#include "instancetype.h"
+
 InstanceLoader::InstanceLoader(QObject *parent) :
 	QObject(parent)
 {
 }
+
+
+InstanceLoader::InstTypeError InstanceLoader::registerInstanceType(InstanceType *type)
+{
+	// Check to see if the type ID exists.
+	if (m_typeMap.contains(type->typeID()))
+		return TypeIDExists;
+	
+	// Set the parent to this.
+	type->setParent(this);
+	
+	// Add it to the map.
+	m_typeMap.insert(type->typeID(), type);
+	return NoError;
+}
+
+InstanceLoader::InstTypeError InstanceLoader::createInstance(Instance *inst, 
+															 const InstanceType *type, 
+															 const QString &instDir)
+{
+	// Check if the type is registered.
+	if (!type || findType(type->typeID()) != type)
+		return TypeNotRegistered;
+	
+	// Create the instance.
+	return type->createInstance(inst, instDir);
+}
+
+InstanceLoader::InstTypeError InstanceLoader::loadInstance(Instance *inst, 
+														   const InstanceType *type, 
+														   const QString &instDir)
+{
+	// Check if the type is registered.
+	if (!type || findType(type->typeID()) != type)
+		return TypeNotRegistered;
+	
+	return type->loadInstance(inst, instDir);
+}
+
+const InstanceType *InstanceLoader::findType(const QString &id)
+{
+	if (!m_typeMap.contains(id))
+		return NULL;
+	else
+		return m_typeMap[id];
+}
+
+InstTypeList InstanceLoader::typeList()
+{
+	InstTypeList typeList;
+	
+	for (auto iter = m_typeMap.begin(); iter != m_typeMap.end(); iter++)
+	{
+		typeList.append(*iter);
+	}
+	
+	return typeList;
+}
diff --git a/data/inst/instanceloader.h b/data/inst/instanceloader.h
index 943a9b2c..1a8a598f 100644
--- a/data/inst/instanceloader.h
+++ b/data/inst/instanceloader.h
@@ -17,10 +17,14 @@
 #define INSTANCELOADER_H
 
 #include <QObject>
+#include <QMap>
+#include <QList>
 
 class InstanceType;
 class Instance;
 
+typedef QList<const InstanceType *> InstTypeList;
+
 /*!
  * \brief The InstanceLoader is a singleton that manages all of the instance types and handles loading and creating instances.
  * Instance types are registered with the instance loader through its registerInstType() function. 
@@ -41,6 +45,7 @@ public:
 	 * TypeNotRegistered is returned by createInstance() and loadInstance() when the given type is not registered.
 	 * InstExists is returned by createInstance() if the given instance directory is already an instance.
 	 * NotAnInstance is returned by loadInstance() if the given instance directory is not a valid instance.
+	 * WrongInstType is returned by loadInstance() if the given instance directory's type doesn't match the given type.
 	 */
 	enum InstTypeError
 	{
@@ -51,7 +56,8 @@ public:
 		
 		TypeNotRegistered,
 		InstExists,
-		NotAnInstance
+		NotAnInstance,
+		WrongInstType
 	};
 	
 	/*!
@@ -84,11 +90,28 @@ public:
 	 * \return An InstTypeError error code.
 	 *         TypeNotRegistered if the given type is not registered with the InstanceLoader.
 	 *         NotAnInstance if the given instance directory isn't a valid instance.
+	 *         WrongInstType if the given instance directory's type isn't the same as the given type.
 	 */
 	InstTypeError loadInstance(Instance *inst, const InstanceType *type, const QString &instDir);
 	
+	/*!
+	 * \brief Finds an instance type with the given ID.
+	 *        If one cannot be found, returns NULL.
+	 * \param id The ID of the type to find.
+	 * \return The type with the given ID. NULL if none were found.
+	 */
+	const InstanceType *findType(const QString &id);
+	
+	/*!
+	 * \brief Gets a list of the registered instance types.
+	 * \return A list of instance types.
+	 */
+	InstTypeList typeList();
+	
 private:
 	explicit InstanceLoader(QObject *parent = 0);
+	
+	QMap<QString, InstanceType *> m_typeMap;
 };
 
 #endif // INSTANCELOADER_H
diff --git a/data/inst/instancetype.h b/data/inst/instancetype.h
index 1f187310..ec3f5b87 100644
--- a/data/inst/instancetype.h
+++ b/data/inst/instancetype.h
@@ -34,6 +34,8 @@ class InstanceType : public QObject
 public:
 	explicit InstanceType(QObject *parent = 0);
 	
+	friend class InstanceLoader;
+	
 	/*!
 	 * \brief Gets the ID for this instance type.
 	 *        By default this is the name of the Instance class that this type 
@@ -57,6 +59,7 @@ public:
 	 */
 	virtual QString description() const	= 0;
 	
+protected:
 	/*!
 	 * \brief Creates an instance and stores it in inst.
 	 * \param inst Pointer to store the created instance in.
@@ -65,7 +68,7 @@ public:
 	 *         TypeNotRegistered if the given type is not registered with the InstanceLoader.
 	 *         InstExists if the given instance directory is already an instance.
 	 */
-	virtual InstanceLoader::InstTypeError createInstance(Instance *inst, const QString &instDir) = 0;
+	virtual InstanceLoader::InstTypeError createInstance(Instance *inst, const QString &instDir) const = 0;
 	
 	/*!
 	 * \brief Loads an instance from the given directory.
@@ -74,8 +77,9 @@ public:
 	 * \return An InstTypeError error code.
 	 *         TypeNotRegistered if the given type is not registered with the InstanceLoader.
 	 *         NotAnInstance if the given instance directory isn't a valid instance.
+	 *         WrongInstType if the given instance directory's type isn't an instance of this type.
 	 */
-	virtual InstanceLoader::InstTypeError loadInstance(Instance *inst, const QString &instDir) = 0;
+	virtual InstanceLoader::InstTypeError loadInstance(Instance *inst, const QString &instDir) const = 0;
 };
 
 #endif // INSTANCETYPE_H