87 lines
2.2 KiB
C++
87 lines
2.2 KiB
C++
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#include "tidentifiable.h"
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#include <set>
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namespace {
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class IdentifierTable { // singleton
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unsigned long m_lastId;
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std::map<unsigned long, TIdentifiable *> m_table;
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std::set<TIdentifiable *> m_objects;
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IdentifierTable() : m_lastId(0) {}
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public:
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static IdentifierTable *instance() {
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// NON DEVE MORIRE
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// static IdentifierTable _instance;
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// return &_instance;
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static IdentifierTable *_instance = 0;
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if (!_instance) _instance = new IdentifierTable;
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return _instance;
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}
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unsigned long getNextId() { return ++m_lastId; }
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void insert(TIdentifiable *o) {
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unsigned long id = o->getIdentifier();
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std::map<unsigned long, TIdentifiable *>::iterator it = m_table.find(id);
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if (it != m_table.end()) {
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if (it->second == o) return;
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m_objects.erase(it->second);
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it->second = o;
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} else {
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m_table[id] = o;
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}
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m_objects.insert(o);
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}
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void erase(TIdentifiable *o) {
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unsigned long id = o->getIdentifier();
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m_table.erase(id);
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m_objects.erase(o);
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}
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TIdentifiable *fetch(unsigned long id) {
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std::map<unsigned long, TIdentifiable *>::iterator it = m_table.find(id);
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return it == m_table.end() ? 0 : it->second;
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}
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};
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} // namespace
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TIdentifiable::TIdentifiable() : m_id(0) {}
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TIdentifiable::~TIdentifiable() {
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if (m_id != 0) IdentifierTable::instance()->erase(this);
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}
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TIdentifiable::TIdentifiable(const TIdentifiable &src) : m_id(src.m_id) {}
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const TIdentifiable &TIdentifiable::operator=(const TIdentifiable &src) {
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if (src.m_id != m_id && m_id != 0) IdentifierTable::instance()->erase(this);
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m_id = src.m_id;
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return *this;
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}
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void TIdentifiable::setIdentifier(unsigned long id) {
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bool wasStored = m_id > 0 && IdentifierTable::instance()->fetch(m_id) == this;
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if (m_id != id && m_id != 0) IdentifierTable::instance()->erase(this);
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m_id = id;
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if (wasStored) IdentifierTable::instance()->insert(this);
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}
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void TIdentifiable::setNewIdentifier() {
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setIdentifier(IdentifierTable::instance()->getNextId());
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}
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void TIdentifiable::storeByIdentifier() {
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assert(getIdentifier() >= 1);
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IdentifierTable::instance()->insert(this);
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}
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TIdentifiable *TIdentifiable::fetchByIdentifier(unsigned long id) {
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return IdentifierTable::instance()->fetch(id);
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}
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