icinga2/base/objectset.h

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/******************************************************************************
* Icinga 2 *
* Copyright (C) 2012 Icinga Development Team (http://www.icinga.org/) *
* *
* This program 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; either version 2 *
* of the License, or (at your option) any later version. *
* *
* 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, write to the Free Software Foundation *
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
******************************************************************************/
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#ifndef OBJECTSET_H
#define OBJECTSET_H
namespace icinga
{
template<typename TValue>
class ObjectSet : public Object
{
public:
typedef shared_ptr<ObjectSet<TValue> > Ptr;
typedef weak_ptr<ObjectSet<TValue> > WeakPtr;
typedef typename set<TValue>::iterator Iterator;
ObjectSet(void)
: m_Parent(), m_Predicate()
{ }
ObjectSet(const typename ObjectSet<TValue>::Ptr& parent, function<bool(const TValue&)> predicate)
: m_Parent(parent), m_Predicate(predicate)
{ }
void Start(void)
{
if (m_Parent) {
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m_Parent->OnObjectAdded.connect(boost::bind(&ObjectSet::ObjectAddedOrCommittedHandler, this, _2));
m_Parent->OnObjectCommitted.connect(boost::bind(&ObjectSet::ObjectAddedOrCommittedHandler, this, _2));
m_Parent->OnObjectRemoved.connect(boost::bind(&ObjectSet::ObjectRemovedHandler, this, _2));
for (ObjectSet::Iterator it = m_Parent->Begin(); it != m_Parent->End(); it++)
CheckObject(*it);
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}
}
void AddObject(const TValue& object)
{
m_Objects.insert(object);
OnObjectAdded(GetSelf(), object);
}
void RemoveObject(const TValue& object)
{
ObjectSet::Iterator it = m_Objects.find(object);
if (it != m_Objects.end()) {
m_Objects.erase(it);
OnObjectRemoved(GetSelf(), object);
}
}
bool Contains(const TValue& object) const
{
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return !(m_Objects.find(object) == m_Objects.end());
}
void CheckObject(const TValue& object)
{
if (m_Predicate && !m_Predicate(object)) {
RemoveObject(object);
} else {
if (!Contains(object)) {
AddObject(object);
} else {
OnObjectCommitted(GetSelf(), object);
}
}
}
boost::signal<void (const typename ObjectSet<TValue>::Ptr&, const TValue&)> OnObjectAdded;
boost::signal<void (const typename ObjectSet<TValue>::Ptr&, const TValue&)> OnObjectCommitted;
boost::signal<void (const typename ObjectSet<TValue>::Ptr&, const TValue&)> OnObjectRemoved;
Iterator Begin(void)
{
return m_Objects.begin();
}
Iterator End(void)
{
return m_Objects.end();
}
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void ForeachObject(function<void (const typename Object::Ptr&, const TValue&)> callback)
{
for (Iterator it = Begin(); it != End(); it++) {
callback(GetSelf(), *it);
}
}
private:
set<TValue> m_Objects;
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typename ObjectSet<TValue>::Ptr m_Parent;
function<bool (const TValue&)> m_Predicate;
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void ObjectAddedOrCommittedHandler(const TValue& object)
{
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CheckObject(object);
}
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void ObjectRemovedHandler(const TValue& object)
{
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RemoveObject(object);
}
};
}
#endif /* OBJECTSET_H */