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https://github.com/ClickHouse/ClickHouse.git
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183 lines
3.3 KiB
C++
183 lines
3.3 KiB
C++
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//
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// Manifest.h
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//
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// $Id: //poco/1.4/Foundation/include/Poco/Manifest.h#1 $
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//
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// Library: Foundation
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// Package: SharedLibrary
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// Module: ClassLoader
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//
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// Definition of the Manifest class.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Foundation_Manifest_INCLUDED
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#define Foundation_Manifest_INCLUDED
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#include "Poco/Foundation.h"
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#include "Poco/MetaObject.h"
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#include <map>
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#include <typeinfo>
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namespace Poco {
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class Foundation_API ManifestBase
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/// ManifestBase is a common base class for
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/// all instantiations of Manifest.
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{
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public:
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ManifestBase();
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virtual ~ManifestBase();
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virtual const char* className() const = 0;
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/// Returns the type name of the manifest's class.
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};
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template <class B>
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class Manifest: public ManifestBase
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/// A Manifest maintains a list of all classes
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/// contained in a dynamically loadable class
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/// library.
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/// Internally, the information is held
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/// in a map. An iterator is provided to
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/// iterate over all the classes in a Manifest.
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{
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public:
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typedef AbstractMetaObject<B> Meta;
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typedef std::map<std::string, const Meta*> MetaMap;
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class Iterator
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/// The Manifest's very own iterator class.
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{
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public:
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Iterator(const typename MetaMap::const_iterator& it)
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{
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_it = it;
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}
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Iterator(const Iterator& it)
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{
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_it = it._it;
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}
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~Iterator()
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{
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}
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Iterator& operator = (const Iterator& it)
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{
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_it = it._it;
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return *this;
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}
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inline bool operator == (const Iterator& it) const
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{
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return _it == it._it;
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}
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inline bool operator != (const Iterator& it) const
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{
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return _it != it._it;
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}
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Iterator& operator ++ () // prefix
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{
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++_it;
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return *this;
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}
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Iterator operator ++ (int) // postfix
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{
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Iterator result(_it);
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++_it;
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return result;
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}
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inline const Meta* operator * () const
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{
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return _it->second;
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}
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inline const Meta* operator -> () const
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{
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return _it->second;
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}
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private:
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typename MetaMap::const_iterator _it;
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};
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Manifest()
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/// Creates an empty Manifest.
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{
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}
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virtual ~Manifest()
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/// Destroys the Manifest.
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{
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clear();
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}
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Iterator find(const std::string& className) const
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/// Returns an iterator pointing to the MetaObject
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/// for the given class. If the MetaObject cannot
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/// be found, the iterator points to end().
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{
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return Iterator(_metaMap.find(className));
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}
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Iterator begin() const
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{
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return Iterator(_metaMap.begin());
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}
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Iterator end() const
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{
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return Iterator(_metaMap.end());
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}
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bool insert(const Meta* pMeta)
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/// Inserts a MetaObject. Returns true if insertion
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/// was successful, false if a class with the same
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/// name already exists.
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{
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return _metaMap.insert(typename MetaMap::value_type(pMeta->name(), pMeta)).second;
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}
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void clear()
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/// Removes all MetaObjects from the manifest.
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{
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for (typename MetaMap::iterator it = _metaMap.begin(); it != _metaMap.end(); ++it)
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{
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delete it->second;
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}
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_metaMap.clear();
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}
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int size() const
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/// Returns the number of MetaObjects in the Manifest.
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{
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return int(_metaMap.size());
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}
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bool empty() const
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/// Returns true iff the Manifest does not contain any MetaObjects.
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{
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return _metaMap.empty();
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}
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const char* className() const
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{
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return typeid(*this).name();
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}
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private:
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MetaMap _metaMap;
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};
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} // namespace Poco
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#endif // Foundation_Manifest_INCLUDED
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