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constraints
WPropertyConstraintNotEmpty.h
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//---------------------------------------------------------------------------
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//
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// Project: OpenWalnut ( http://www.openwalnut.org )
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//
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// Copyright 2009 OpenWalnut Community, BSV@Uni-Leipzig and CNCF@MPI-CBS
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// For more information see http://www.openwalnut.org/copying
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//
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// This file is part of OpenWalnut.
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//
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// OpenWalnut is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// OpenWalnut is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with OpenWalnut. If not, see <http://www.gnu.org/licenses/>.
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//
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//---------------------------------------------------------------------------
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#ifndef WPROPERTYCONSTRAINTNOTEMPTY_H
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#define WPROPERTYCONSTRAINTNOTEMPTY_H
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#include "../WPropertyTypes.h"
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#include "WPropertyConstraintTypes.h"
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/**
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* This class allows constraining properties to be not empty. This is especially useful for strings. This works on all types
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* providing an empty() member function (as std::string and boost::filesystem::path do).
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*/
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template
<
typename
T >
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class
WPropertyConstraintNotEmpty
:
public
WPropertyVariable
< T >
::PropertyConstraint
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{
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public
:
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/**
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* Constructor.
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*/
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explicit
WPropertyConstraintNotEmpty
();
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/**
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* Destructor.
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*/
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virtual
~WPropertyConstraintNotEmpty
();
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/**
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* Checks whether the specified new value is larger or equal to the specified min value.
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*
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* \param property the property whose new value should be set.
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* \param value the new value to check
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*
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* \return true if value >= m_min
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*/
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virtual
bool
accept
( boost::shared_ptr<
WPropertyVariable< T >
> property,
const
T
& value );
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/**
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* Allows simple identification of the real constraint type.
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*
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* \return the type
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*/
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virtual
PROPERTYCONSTRAINT_TYPE
getType
();
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/**
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* Method to clone the constraint and create a new one with the correct dynamic type.
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*
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* \return the constraint.
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*/
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virtual
boost::shared_ptr< typename WPropertyVariable< T >::PropertyConstraint >
clone
();
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private
:
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};
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template
<
typename
T >
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WPropertyConstraintNotEmpty< T >::WPropertyConstraintNotEmpty
()
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{
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}
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template
<
typename
T >
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WPropertyConstraintNotEmpty< T >::~WPropertyConstraintNotEmpty
()
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{
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}
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template
<
typename
T >
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bool
WPropertyConstraintNotEmpty< T >::accept
( boost::shared_ptr<
WPropertyVariable< T >
>
/* property */
,
const
T
& value )
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{
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return
!value.empty();
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}
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template
<
typename
T >
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PROPERTYCONSTRAINT_TYPE
WPropertyConstraintNotEmpty< T >::getType
()
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{
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return
PC_NOTEMPTY;
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}
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template
<
typename
T >
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boost::shared_ptr< typename WPropertyVariable< T >::PropertyConstraint >
WPropertyConstraintNotEmpty< T >::clone
()
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{
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return
boost::shared_ptr< typename WPropertyVariable< T >::PropertyConstraint >(
new
WPropertyConstraintNotEmpty< T >
( *this ) );
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}
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#endif // WPROPERTYCONSTRAINTNOTEMPTY_H
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