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is_valid_primary_key.h
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    00001 /****************************************************************************
    00002 **
    00003 ** http://www.qxorm.com/
    00004 ** Copyright (C) 2013 Lionel Marty (contact@qxorm.com)
    00005 **
    00006 ** This file is part of the QxOrm library
    00007 **
    00008 ** This software is provided 'as-is', without any express or implied
    00009 ** warranty. In no event will the authors be held liable for any
    00010 ** damages arising from the use of this software
    00011 **
    00012 ** Commercial Usage
    00013 ** Licensees holding valid commercial QxOrm licenses may use this file in
    00014 ** accordance with the commercial license agreement provided with the
    00015 ** Software or, alternatively, in accordance with the terms contained in
    00016 ** a written agreement between you and Lionel Marty
    00017 **
    00018 ** GNU General Public License Usage
    00019 ** Alternatively, this file may be used under the terms of the GNU
    00020 ** General Public License version 3.0 as published by the Free Software
    00021 ** Foundation and appearing in the file 'license.gpl3.txt' included in the
    00022 ** packaging of this file. Please review the following information to
    00023 ** ensure the GNU General Public License version 3.0 requirements will be
    00024 ** met : http://www.gnu.org/copyleft/gpl.html
    00025 **
    00026 ** If you are unsure which license is appropriate for your use, or
    00027 ** if you have questions regarding the use of this file, please contact :
    00028 ** contact@qxorm.com
    00029 **
    00030 ****************************************************************************/
    00031
    00032 #ifndef _QX_IS_VALID_PRIMARY_KEY_H_
    00033 #define _QX_IS_VALID_PRIMARY_KEY_H_
    00034
    00035 #ifdef _MSC_VER
    00036 #pragma once
    00037 #endif
    00038
    00046 namespace qx {
    00047 namespace trait {
    00048 namespace detail {
    00049
    00054 template <typename T>
    00055 struct is_valid_primary_key
    00056 { static inline bool get(const T & t) { Q_UNUSED(t); qAssert(false); return false; } };
    00057
    00058 template <>
    00059 struct is_valid_primary_key<short>
    00060 { static inline bool get(const short & t) { return (t != 0); } };
    00061
    00062 template <>
    00063 struct is_valid_primary_key<int>
    00064 { static inline bool get(const int & t) { return (t != 0); } };
    00065
    00066 template <>
    00067 struct is_valid_primary_key<long>
    00068 { static inline bool get(const long & t) { return (t != 0); } };
    00069
    00070 template <>
    00071 struct is_valid_primary_key<long long>
    00072 { static inline bool get(const long long & t) { return (t != 0); } };
    00073
    00074 template <>
    00075 struct is_valid_primary_key<QString>
    00076 { static inline bool get(const QString & t) { return (! t.isEmpty()); } };
    00077
    00078 template <>
    00079 struct is_valid_primary_key<std::string>
    00080 { static inline bool get(const std::string & t) { return (! t.empty()); } };
    00081
    00082 template <>
    00083 struct is_valid_primary_key<std::wstring>
    00084 { static inline bool get(const std::wstring & t) { return (! t.empty()); } };
    00085
    00086 template <>
    00087 struct is_valid_primary_key<QVariant>
    00088 { static inline bool get(const QVariant & t) { return ((t.type() == QVariant::String) ? qx::trait::detail::is_valid_primary_key<QString>::get(t.toString()) : (! t.isNull() && (t.toLongLong() != 0))); } };
    00089
    00090 } // namespace detail
    00091
    00092 template <typename T>
    00093 inline bool is_valid_primary_key(const T & t)
    00094 { return qx::trait::detail::is_valid_primary_key<T>::get(t); }
    00095
    00096 } // namespace trait
    00097 } // namespace qx
    00098
    00099 #endif // _QX_IS_VALID_PRIMARY_KEY_H_