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144 lines
3.8 KiB
144 lines
3.8 KiB
/*****************************************************************************
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* var_bool.hpp
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*****************************************************************************
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* Copyright (C) 2003 the VideoLAN team
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* $Id$
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*
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* Authors: Cyril Deguet <asmax@via.ecp.fr>
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* Olivier Teulière <ipkiss@via.ecp.fr>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifndef VAR_BOOL_HPP
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#define VAR_BOOL_HPP
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#include "variable.hpp"
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#include "observer.hpp"
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/// Interface for read-only boolean variable
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class VarBool: public Variable, public Subject<VarBool>
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{
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public:
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/// Get the variable type
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virtual const std::string &getType() const { return m_type; }
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/// Get the boolean value
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virtual bool get() const = 0;
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protected:
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VarBool( intf_thread_t *pIntf ): Variable( pIntf ) { }
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virtual ~VarBool() { }
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private:
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/// Variable type
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static const std::string m_type;
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};
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/// Constant true VarBool
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class VarBoolTrue: public VarBool
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{
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public:
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VarBoolTrue( intf_thread_t *pIntf ): VarBool( pIntf ) { }
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virtual ~VarBoolTrue() { }
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virtual bool get() const { return true; }
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};
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/// Constant false VarBool
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class VarBoolFalse: public VarBool
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{
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public:
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VarBoolFalse( intf_thread_t *pIntf ): VarBool( pIntf ) { }
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virtual ~VarBoolFalse() { }
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virtual bool get() const { return false; }
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};
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/// Boolean variable implementation (read/write)
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class VarBoolImpl: public VarBool
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{
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public:
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VarBoolImpl( intf_thread_t *pIntf );
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virtual ~VarBoolImpl() { }
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// Get the boolean value
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virtual bool get() const { return m_value; }
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/// Set the internal value
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virtual void set( bool value );
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private:
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/// Boolean value
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bool m_value;
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};
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/// Conjunction of two boolean variables (AND)
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class VarBoolAndBool: public VarBool, public Observer<VarBool>
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{
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public:
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VarBoolAndBool( intf_thread_t *pIntf, VarBool &rVar1, VarBool &rVar2 );
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virtual ~VarBoolAndBool();
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virtual bool get() const { return m_value; }
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// Called when one of the observed variables is changed
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void onUpdate( Subject<VarBool> &rVariable, void* );
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private:
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/// Boolean variables
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VarBool &m_rVar1, &m_rVar2;
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bool m_value;
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};
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/// Disjunction of two boolean variables (OR)
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class VarBoolOrBool: public VarBool, public Observer<VarBool>
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{
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public:
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VarBoolOrBool( intf_thread_t *pIntf, VarBool &rVar1, VarBool &rVar2 );
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virtual ~VarBoolOrBool();
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virtual bool get() const { return m_value; }
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// Called when one of the observed variables is changed
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void onUpdate( Subject<VarBool> &rVariable, void* );
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private:
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/// Boolean variables
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VarBool &m_rVar1, &m_rVar2;
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bool m_value;
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};
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/// Negation of a boolean variable (NOT)
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class VarNotBool: public VarBool, public Observer<VarBool>
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{
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public:
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VarNotBool( intf_thread_t *pIntf, VarBool &rVar );
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virtual ~VarNotBool();
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virtual bool get() const { return !m_rVar.get(); }
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// Called when the observed variable is changed
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void onUpdate( Subject<VarBool> &rVariable, void* );
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private:
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/// Boolean variable
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VarBool &m_rVar;
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};
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#endif
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