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/* Copyright 2013 MultiMC Contributors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef INSTANCELOADER_H
#define INSTANCELOADER_H
#include <QObject>
class InstanceType;
class Instance;
/*!
* \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.
* Creating instances is done through the InstanceLoader's createInstance() function. This function takes
*/
class InstanceLoader : public QObject
{
Q_OBJECT
public:
static InstanceLoader instLoader;
/*!
* \brief Error codes returned by functions in the InstanceLoader and InstanceType classes.
* NoError indicates that no error occurred.
* OtherError indicates that an unspecified error occurred.
* TypeIDExists is returned by registerInstanceType() if the ID of the type being registered already exists.
*
* 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.
*/
enum InstTypeError
{
NoError = 0,
OtherError,
TypeIDExists,
TypeNotRegistered,
InstExists,
NotAnInstance
};
/*!
* \brief Registers the given InstanceType with the instance loader.
* This causes the instance loader to take ownership of the given
* instance type (meaning the instance type's parent will be set to
* the instance loader).
* \param type The InstanceType to register.
* \return An InstTypeError error code.
* TypeIDExists if the given type's is already registered to another instance type.
*/
InstTypeError registerInstanceType(InstanceType *type);
/*!
* \brief Creates an instance with the given type and stores it in inst.
* \param inst Pointer to store the created instance in.
* \param type The type of instance to create.
* \param instDir The instance's directory.
* \return An InstTypeError error code.
* TypeNotRegistered if the given type is not registered with the InstanceLoader.
* InstExists if the given instance directory is already an instance.
*/
InstTypeError createInstance(Instance *inst, const InstanceType *type, const QString &instDir);
/*!
* \brief Loads an instance from the given directory.
* \param inst Pointer to store the loaded instance in.
* \param type The type of instance to load.
* \param instDir The instance's directory.
* \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.
*/
InstTypeError loadInstance(Instance *inst, const InstanceType *type, const QString &instDir);
private:
explicit InstanceLoader(QObject *parent = 0);
};
#endif // INSTANCELOADER_H
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