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PropertyVerifier.h

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// $Header: /nfs/slac/g/glast/ground/cvs/GaudiKernel/GaudiKernel/PropertyVerifier.h,v 1.1.1.1 2001/04/18 18:14:18 tlindner Exp $
#ifndef GAUDIKERNEL_PROPERTYVERIFIER_H
#define GAUDIKERNEL_PROPERTYVERIFIER_H
/**********************************************************
 * Verifier Classes are used with Property Classes to 
 * provide validation criteria for Property values.
 *
 **********************************************************/

template< class T >
class PropertyVerifier {
public:
  // Data and Function Members for Collaborators.
  // Constructors - compiler generated default is ok
  // Destructor
  virtual ~PropertyVerifier() { }

  // Copy Constructor - compiler generated default is ok
  // Assignment Operator - compiler generated default is ok
  // Accessor members (const)
  virtual bool isValid( const T* value ) const = 0;
};

template< class T >
class BoundedVerifier : PropertyVerifier< T > {     // Abstract derived class
public:
  BoundedVerifier()
      : m_hasLowerBound( false ), 
        m_hasUpperBound( false ), 
        m_lowerBound( T() ),
        m_upperBound( T() ) { }

  virtual ~BoundedVerifier() { }

  bool isValid( const T* value ) const { 
    return   (( m_hasLowerBound && ( *value < m_lowerBound ) ) ? false : true ) 
          && (( m_hasUpperBound && ( *value > m_upperBound ) ) ? false : true );
  }

  bool        hasLower() const { return m_hasLowerBound; }
  bool        hasUpper() const { return m_hasUpperBound; }
  const T&    lower()    const { return m_lowerBound; }
  const T&    upper()    const { return m_upperBound; }

  void setLower( const T& value ) { m_hasLowerBound = true; m_lowerBound = value; }
  void setUpper( const T& value ) { m_hasUpperBound = true; m_upperBound = value; }
  void clearLower()  { m_hasLowerBound = false; m_lowerBound = T(); }
  void clearUpper()  { m_hasUpperBound = false; m_upperBound = T(); }

  void setBounds( const T& lower, const T& upper) {
    setLower( lower ); 
    setUpper( upper ); 
  }

  void clearBounds() {
     clearLower(); 
     clearUpper(); 
  }

private:
  bool  m_hasLowerBound;
  bool  m_hasUpperBound;
  T     m_lowerBound;
  T     m_upperBound;
};

template< class T >
class NullVerifier : public BoundedVerifier< T > {
public:
  // Data and Function Members for Collaborators.
  static const NullVerifier< T >& theNullVerifier();  // Only one NullVerifier ever needed

  // Data and Function Members for Collaborators.
  // Constructors - compiler generated default is ok
  // Destructor
  virtual ~NullVerifier() { };

  // Copy Constructor - compiler generated default is ok
  // Assignment Operator - compiler generated default is ok

  // Accessor members (const)
  virtual bool isValid( const T* ) const { return true; }
};

#endif    // GAUDIKERNEL_PROPERTYVERIFIER_H

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