is_valid_primary_key.h

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** Copyright (C) 2013 Lionel Marty (contact@qxorm.com)
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#ifndef _QX_IS_VALID_PRIMARY_KEY_H_
#define _QX_IS_VALID_PRIMARY_KEY_H_

#ifdef _MSC_VER
#pragma once
#endif

namespace qx {
namespace trait {
namespace detail {

template <typename T>
struct is_valid_primary_key
{ static inline bool get(const T & t) { Q_UNUSED(t); qAssert(false); return false; } };

template <>
struct is_valid_primary_key<short>
{ static inline bool get(const short & t) { return (t != 0); } };

template <>
struct is_valid_primary_key<int>
{ static inline bool get(const int & t) { return (t != 0); } };

template <>
struct is_valid_primary_key<long>
{ static inline bool get(const long & t) { return (t != 0); } };

template <>
struct is_valid_primary_key<long long>
{ static inline bool get(const long long & t) { return (t != 0); } };

template <>
struct is_valid_primary_key<QString>
{ static inline bool get(const QString & t) { return (! t.isEmpty()); } };

template <>
struct is_valid_primary_key<QByteArray>
{ static inline bool get(const QByteArray & t) { return (! t.isEmpty()); } };

template <>
struct is_valid_primary_key<std::string>
{ static inline bool get(const std::string & t) { return (! t.empty()); } };

template <>
struct is_valid_primary_key<std::wstring>
{ static inline bool get(const std::wstring & t) { return (! t.empty()); } };

template <>
struct is_valid_primary_key<QVariant>
{
   static inline bool get(const QVariant & t)
   {
      if (t.type() == QVariant::ByteArray) { return qx::trait::detail::is_valid_primary_key<QByteArray>::get(t.toByteArray()); }
      if (t.type() == QVariant::String) { return qx::trait::detail::is_valid_primary_key<QString>::get(t.toString()); }
      return (! t.isNull() && (t.toLongLong() != 0));
   }
};

} // namespace detail

template <typename T>
inline bool is_valid_primary_key(const T & t)
{ return qx::trait::detail::is_valid_primary_key<T>::get(t); }

} // namespace trait
} // namespace qx

#endif // _QX_IS_VALID_PRIMARY_KEY_H_