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/*
* Anope IRC Services
*
* Copyright (C) 2009-2017 Anope Team <team@anope.org>
*
* This file is part of Anope. Anope 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, version 2.
*
* 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 see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "anope.h"
#include "service.h"
#include "logger.h"
class Extensible;
class CoreExport ExtensibleBase : public Service
{
protected:
std::map<Extensible *, void *> items;
ExtensibleBase(Module *m, const Anope::string &n);
ExtensibleBase(Module *m, const Anope::string &t, const Anope::string &n);
public:
virtual void Unset(Extensible *obj) anope_abstract;
static constexpr const char *NAME = "Extensible";
};
class CoreExport Extensible
{
public:
std::vector<ExtensibleBase *> extension_items;
virtual ~Extensible();
template<typename T> T* GetExt(const Anope::string &name);
bool HasExtOK(const Anope::string &name);
template<typename T> T* Extend(const Anope::string &name, const T &what);
template<typename T> void Shrink(const Anope::string &name);
};
template<typename T>
class ExtensibleItem : public ExtensibleBase
{
public:
ExtensibleItem(Module *m, const Anope::string &n) : ExtensibleBase(m, n) { }
ExtensibleItem(Module *m, const Anope::string &t, const Anope::string &n) : ExtensibleBase(m, t, n) { }
~ExtensibleItem()
{
while (!items.empty())
{
std::map<Extensible *, void *>::iterator it = items.begin();
Extensible *obj = it->first;
T *value = static_cast<T *>(it->second);
auto it2 = std::find(obj->extension_items.begin(), obj->extension_items.end(), this);
if (it2 != obj->extension_items.end())
obj->extension_items.erase(it2);
items.erase(it);
delete value;
}
}
T* Set(Extensible *obj, const T &value)
{
T* t = new T(value);
Unset(obj);
items[obj] = t;
obj->extension_items.push_back(this);
return t;
}
void Unset(Extensible *obj) override
{
T *value = Get(obj);
items.erase(obj);
auto it = std::find(obj->extension_items.begin(), obj->extension_items.end(), this);
if (it != obj->extension_items.end())
obj->extension_items.erase(it);
delete value;
}
T* Get(Extensible *obj)
{
std::map<Extensible *, void *>::const_iterator it = items.find(obj);
if (it != items.end())
return static_cast<T *>(it->second);
return nullptr;
}
bool HasExt(Extensible *obj)
{
return items.find(obj) != items.end();
}
T* Require(Extensible *obj)
{
T* t = Get(obj);
if (t)
return t;
return Set(obj, T());
}
};
template<typename T>
struct ExtensibleRef : ServiceReference<ExtensibleItem<T>>
{
ExtensibleRef(const Anope::string &n) : ServiceReference<ExtensibleItem<T>>(n) { }
};
template<typename T>
T* Extensible::GetExt(const Anope::string &name)
{
ExtensibleRef<T> ref(name);
if (ref)
return ref->Get(this);
Anope::Logger.Debug("GetExt for nonexistent type {0} on {1}", name, static_cast<void *>(this));
return NULL;
}
template<typename T>
T* Extensible::Extend(const Anope::string &name, const T &what)
{
ExtensibleRef<T> ref(name);
if (ref)
{
ref->Set(this, what);
return ref->Get(this);
}
Anope::Logger.Debug("Extend for nonexistent type {0} on {1}", name, static_cast<void *>(this));
return NULL;
}
template<typename T>
void Extensible::Shrink(const Anope::string &name)
{
ExtensibleRef<T> ref(name);
if (ref)
ref->Unset(this);
else
Anope::Logger.Debug("Shrink for nonexistent type {0} on {1}", name, static_cast<void *>(this));
}
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