cFunctionIf.h

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/**
 * @class cFunctionIf
 * file name: cFunctionIf.h
 * @author Betti Oesterholz
 * @date 03.06.2011
 * @mail webmaster@BioKom.info
 *
 * System: C++
 *
 * This class represents a Fib if-function.
 * Copyright (C) @c LGPL3 2010 Betti Oesterholz
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License (LGPL) as
 * published by the Free Software Foundation, either version 3 of the
 * License, or any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 *
 *
 * This class represents a Fib if-function.
 * It gives back the value of the first underfunction if the condition is
 * true, else the value of the second underfunction.
 * ( if( condition, underfunction1, underfunction2) )
 *
 */
/*
History:
03.06.2011  Oesterholz  created
19.10.2011  Oesterholz  FEATURE_EQUAL_FIB_OBJECT implemented
*/

#ifndef ___C_FUNCTION_IF_H__
#define ___C_FUNCTION_IF_H__


#include "cFunctionTwoValue.h"
#include "cCondition.h"

#include "cmath"


namespace fib{


class cFunctionIf: public cFunctionTwoValue{
   
   /**
    * A pointer to the condition of the if-function.
    */
   cCondition * pCondition;
   
public:

   /**
    * The constructor of the underfunction.
    *
    * @param condition the condition for the function
    *    @see pCondition
    * @param firstUnderfunction the first underfunction for the function
    *    @see pFirstUnderfunction
    * @param secondUnderfunction the second underfunction for the function
    *    @see pSecondUnderfunction
    * @param pInSuperiorFunction the underfunction which contains the
    *    new underfunction
    * @param pInDefiningFibElement the fib -element which defines/ uses
    *    the new underfunction
    */
   cFunctionIf( const cCondition & condition,
      const cUnderFunction & firstUnderfunction,
      const cUnderFunction & secondUnderfunction,
      cUnderFunction * pInSuperiorFunction = NULL,
      cFibElement * pInDefiningFibElement = NULL );

   /**
    * The constructor of the underfunction.
    *
    * @param pInCondition a pointer to the condition for the function
    *    Beware: It (pInCondition) won't be copied.
    *    @see pCondition
    * @param pInFirstUnderfunction a pointer to the first underfunction
    *    for the function
    *    Beware: It (pInFirstUnderfunction) won't be copied.
    *    @see pFirstUnderfunction
    * @param pInSecondUnderfunction a pointer to the second underfunction
    *    for the function
    *    Beware: It (pInSecondUnderfunction) won't be copied.
    *    @see pSecondUnderfunction
    * @param pInSuperiorFunction the underfunction which contains the
    *    new underfunction
    * @param pInDefiningFibElement the fib -element which defines/ uses
    *    the new underfunction
    */
   cFunctionIf( cCondition * pInCondition,
      cUnderFunction * pInFirstUnderfunction,
      cUnderFunction * pInSecondUnderfunction,
      cUnderFunction * pInSuperiorFunction = NULL,
      cFibElement * pInDefiningFibElement = NULL );

   /**
    * The copy constructor of the underfunction.
    * This constructor will also copy the underfunctions of the given
    * function.
    *
    * @param underfunction the underfunction which to copy
    * @param pInSuperiorFunction the underfunction which contains the
    *    new underfunction
    * @param pInDefiningFibElement the fib -element which defines/ uses
    *    the new underfunction
    */
   cFunctionIf( const cFunctionIf & underfunction,
      cUnderFunction * pInSuperiorFunction = NULL,
      cFibElement *pInDefiningFibElement = NULL );

   /**
    * The constructor for restoring a value underfunction from an TinyXml element.
    *
    * @param pXmlNode a pointer to the TinyXml node the underfunction is stored in
    * @param outStatus An reference to an integervalue where the errorvalue
    *    can be stored to.
    *    possible errorvalues are:
    *       - 0  loading successful
    *       - -1 loading error, invalid pXmlElement
    *       - -2 loading error, invalid data in pXmlElement
    *       - 1 loading warning, invalid data in pXmlElement, error could be corrected
    *       - 2 loading warning, invalid data in pXmlElement, maybe the loaded
    *          object is wrong
    * @param liDefinedVariables a list with the defined variables for the
    *    to restore fib -element, every variable should have it's number
    *    (the number under which it is stored) as it's value
    * @param pInSuperiorFunction the underfunction which contains the
    *    new underfunction
    * @param pInDefiningFibElement the fib -element which defines/ uses
    *    the new underfunction
    */
   cFunctionIf( const TiXmlElement * pXmlElement, intFib & outStatus,
      list<cFibVariable*> & liDefinedVariables,
      cUnderFunction * pInSuperiorFunction = NULL,
      cFibElement * pInDefiningFibElement = NULL );

   /**
    * This constructor restores a value underfunction from the stream
    * where it is stored in the compressed fib -format.
    * Beware: The bits for the functiontype should be allready readed, this
    *    constructor reads yust the two underfunctions.
    *
    * @param iBitStream the stream where this underfunction is stored to in,
    *    because this stream is an cReadBits, any number of bits can be
    *    readed from it
    * @param outStatus An reference to an integervalue where the errorvalue
    *    can be stored to. If the pointer is NULL no errorvalue will be
    *    given back.
    *    possible errorvalues are:
    *       - 0  loading successful
    *       - -1 loading error, invalid stream
    *       - -2 loading error, invalid data in stream
    *       - 1 loading warning, invalid data in stream, error could be corrected
    *       - 2 loading warning, invalid data in stream, maybe the loaded
    *          object is wrong
    * @param liDefinedVariables a list with the defined variables for the
    *    to restore fib -element, every variable should have it's number
    *    (the number under which it is stored) as it's value
    * @param pInDomainValue the domain for value underfunction
    * @param pInDomainVariable the domain for variables
    * @param pInSuperiorFunction the underfunction which contains the
    *    new underfunction
    * @param pInDefiningFibElement the fib -element which defines/ uses
    *    the new underfunction
    */
   cFunctionIf( cReadBits & iBitStream, intFib & outStatus,
      list<cFibVariable*> & liDefinedVariables,
      const cDomainSingle * pInDomainValue, const cDomainSingle * pInDomainVariable,
      cUnderFunction * pInSuperiorFunction = NULL,
      cFibElement * pInDefiningFibElement = NULL );


   /**
    * The destructor of the underfunction.
    */
   virtual ~cFunctionIf();


   /**
    * This method returns if this underfunction is valid, else false.
    * All values in the underfunction and it's underfunctions must be
    * inside the underfunction domain. All variables must be defined over
    * this underfunction.
    * No underfunction should contain itselfor should be contained in one
    * of its underfunctions (no cycles allowed).
    *
    * @return true if this underfunction is valid, else false
    */
   virtual bool isValid() const;

   /**
    * This method checks if the given variable is used in this underfunction.
    *
    * @see cFibVariable
    * @param pVariable the variable to check if it is used
    * @return true if the variable is used, else false
    */
   virtual bool isUsedVariable( const cFibVariable * pVariable ) const;
   
   /**
    * This method returns all variables used in this underfunction.
    *
    * @see cFibVariable
    * @return all variables used in this underfunction
    */
   virtual set<cFibVariable*> getUsedVariables();

   /**
    * This method replace the variable variableOld with the variable
    * variableNew in the underfunction.
    *
    * @see cFibVariable
    * @see isVariable()
    * @see isUsedVariable()
    * @param pVariableOld the variable to replace
    * @param pVariableNew the variable with which the variable variableOld
    *    is to replace
    * @return true if the variable variableOld is replaced with variableNew,
    *    else false
    */
   virtual bool replaceVariable( cFibVariable * pVariableOld,
      cFibVariable * pVariableNew );
   
   /**
    * Sets the Fib -element which defines/ uses this underfunction.
    * If the given pointer is the nullpointer (standardvalue), no
    * Fib -element defines this underfunction.
    *
    * @param definingFibElement a pointer to the Fib -element which
    *    defines/ uses this underfunction
    * @param bCheckDomains getthe domains of the defining element and
    *    check the underfunctionelements with it
    */
   virtual void setDefiningFibElement( cFibElement *fibElement=NULL,
      bool bCheckDomains=true );
   
   /**
    * This method evaluades a value for the time needed to evalue the
    * underfunction.
    * This value should not exceed lMaxTime, if the value for the time
    * is greater than lMaxTime the evaluation will be stopt and lMaxTime
    * returned. If lMaxTime is 0 (for infinity) the evaluation won't be
    * stoped, this is the standard case.
    *
    * @see cFibElement::evalueObject()
    * @param lMaxTime the maximum time for the evaluation, the returned
    *    exceed this value; the value 0 stands for infinity, so the
    *    evaluation won't be stoped
    * @return a value for the time needed to evalue this underfunction
    */
   virtual unsignedLongFib getTimeNeed( unsignedLongFib lMaxTime=0 ) const;
   
   /**
    * This method evaluades the size of the Fib -object in bits in the
    * compressed file form.
    * The optionalpart field of point -elements will be ignored.
    *
    * @see store()
    * @return the size of the Fib -object in bits in the compressed form
    */
   virtual unsignedLongFib getCompressedSize() const;


   /**
    * Returns the value of the underfunction or 0 if non such exists.
    *
    * @return the value of the underfunction or 0 if non
    *    such exists
    */
   virtual doubleFib getValue() const;

   /**
    * This method stores this Fib -object in the compressed Fib -format
    * into the given stream.
    * It is needed becouse the stream can yust store byts but the size of
    * fib -elements can be any number of bits. Because of that ther have to
    * be a possibility to exchange the missing bits betwean the fib -elements.
    *
    * @see store
    * @param stream the stream where this Fib -object should be stored to
    * @param cRestBits the not yet writen bits which should be stored
    * @param uiRestBitPosition the number of bits in the cRestBits which
    *    should be writen respectively containing valid information
    * @return true if this Fib -object is stored, else false
    */
   virtual bool store( ostream & stream, char & cRestBits,
      unsigned char & uiRestBitPosition ) const;

   /**
    * @return the type for the underfunction
    */
   virtual unsignedIntFib getType() const;
   
   /**
    * @return the name for the underfunction
    */
   virtual string getUnderFunctionName() const;

   /**
    * This method duplicates this whole underfunction.
    * Underfunctions of this underfunction are also cloned.
    *
    * @param pSuperiorUnderFunction the underfunction which contains
    * @param pInDefiningFibElement the Fib -element which defines/ uses
    * @return the cloned/ duplicated underfunction
    */
   virtual cFunctionIf * clone(
      cUnderFunction * pInSuperiorUnderFunction = NULL,
      cFibElement *pInDefiningFibElement = NULL) const;
   
   /**
    * This method stores this underfunction in the XML -format into the
    * given stream.
    * Variables should have ther number as ther value.
    *
    * @param stream the stream where this underfunctionshould be
    *    stored to
    * @return true if this underfunction is stored, else false
    */
   virtual bool storeXml( ostream &stream ) const;

#ifndef FEATURE_EQUAL_FIB_OBJECT
   /**
    * This Method checks if the given underfunction is equal to this underfunction.
    *
    * @param underfunction the underfunction to compare with this underfunction
    * @return true if the given underfunction is equal to this underfunction, else false
    */
   virtual bool equal( const cUnderFunction & underfunction ) const;
#endif //FEATURE_EQUAL_FIB_OBJECT

   /**
    * @return This method returns a pointer to the condition of this
    *    function. @see pCondition
    */
   cCondition * getCondition();
   
   /**
    * @return This method returns a pointer to the condition of this
    *    function. @see pCondition
    */
   const cCondition * getCondition() const;
   
   /**
    * This methods sets the condition of this function.
    *
    * @see pCondition
    * @param inCondition the condition, which should be set as the
    *    condition of this function; the condition will be
    *    copied and the copy will be inserted
    * @param bDeleteOld if true the old condition will be deleted from
    *    memory, else the old condition should be deleted elsewhere
    * @return true if inCondition condition was set, else false
    */
   bool setCondition( const cCondition & inCondition,
      bool bDeleteOld=true );

   /**
    * This methods sets the condition of this function.
    *
    * @see pCondition
    * @param pInCondition a pointer to the condition, which should be set
    *    as the condition of this function; the condition will be
    *    copied and the copy will be inserted
    *    Beware: It (pInCondition) won't be copied.
    * @param bDeleteOld if true the old condition will be deleted from
    *    memory, else the old condition should be deleted elsewhere
    * @return true if pInSubCondition condition was set, else false
    */
   bool setCondition( cCondition * pInCondition,
      bool bDeleteOld=true );


protected:

#ifdef FEATURE_EQUAL_FIB_OBJECT
   
   /**
    * This method checks if the given underfunction is equal to this underfunction.
    * Variables can be others, but must be defined and used in equivalent
    * Fib-elements.
    *
    * @param underfunction the underfunction to compare with this underfunction
    * @param mapEqualRootObjects the root objects of this object that wher
    *    already checked as equal
    *    map entries:
    *       key: the root-element of this Fib object that was checked
    *       value: the to the key correspondending root-element of the
    *          fibObject that was checked and which is equal to the key
    *       root-element
    *    (it is empty if bCheckExternalObjects == false)
    * @param mapEqualDefinedVariables the Fib elements that defines
    *    variables and are equal;
    *    map entries:
    *       key: the Fib element of this Fib object that was checked
    *       value: the to the key correspondending Fib element of the
    *          fibObject that was checked and which sets its defined
    *          variables to the same values as the key Fib element
    * @param bCheckExternalObjects if true the external objects of
    *    cExtObject will be compared
    * @return true if the given variable is equal to this variable, else false
    */
   virtual bool equalInternal( const cUnderFunction & underfunction,
      map< const cRoot *, const cRoot * > & mapEqualRootObjects,
      map< const cFibElement *, const cFibElement * > & mapEqualDefinedVariables,
      const bool bCheckExternalObjects ) const;

#endif //FEATURE_EQUAL_FIB_OBJECT

};//end class cFunctionIf


}//end namespace fib

#endif