berryExpression.h

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/*============================================================================

The Medical Imaging Interaction Toolkit (MITK)

Copyright (c) German Cancer Research Center (DKFZ)
All rights reserved.

Use of this source code is governed by a 3-clause BSD license that can be
found in the LICENSE file.

============================================================================*/

#ifndef BERRYEXPRESSION_H_
#define BERRYEXPRESSION_H_

#include "berryExpressionInfo.h"
#include "berryIEvaluationContext.h"
#include "berryEvaluationResult.h"
#include <org_blueberry_core_expressions_Export.h>

#include <berryMacros.h>
#include <berryObject.h>


namespace berry {

class BERRY_EXPRESSIONS Expression : public Object {


public:
  berryObjectMacro(Expression);

  static const uint HASH_CODE_NOT_COMPUTED;

  static const uint HASH_FACTOR;

  static const QString ATT_VALUE;

private:

  mutable uint fHashCode;

protected:

   // static bool Equals(final Object left, final Object right);

  static bool Equals(const QList<Expression::Pointer>& leftArray,
                     const QList<Expression::Pointer>& rightArray);

  static bool Equals(const QList<Object::Pointer>& leftArray,
                     const QList<Object::Pointer>& rightArray);

   static uint HashCode(Expression::Pointer object);

  static uint HashCode(const QList<Expression::Pointer>& array);

  static uint HashCode(const QList<Object::Pointer>& array);

  virtual uint ComputeHashCode() const;


public:

  static const Expression::Pointer TRUE_EVAL;

  static const Expression::Pointer FALSE_EVAL;

  Expression();
  ~Expression() override;

  uint HashCode() const override;

  virtual SmartPointer<const EvaluationResult> Evaluate(IEvaluationContext* context) const = 0;

  virtual const ExpressionInfo* ComputeExpressionInfo() const;

  virtual void CollectExpressionInfo(ExpressionInfo* info) const;

  QString ToString() const override;

  bool operator==(const Object* object) const override;

};

class TRUE_EVALExpression : public Expression
{
public:
  SmartPointer<const EvaluationResult> Evaluate(IEvaluationContext* /*context*/) const override
  {
      return EvaluationResult::TRUE_EVAL;
  }

  void CollectExpressionInfo(ExpressionInfo* /*info*/) const override {}
};

class FALSE_EVALExpression : public Expression
{
public:
  SmartPointer<const EvaluationResult> Evaluate(IEvaluationContext* /*context*/) const override
  {
      return EvaluationResult::FALSE_EVAL;
  }

  void CollectExpressionInfo(ExpressionInfo* /*info*/) const override {}
};

} // namespace berry

#endif /*BERRYEXPRESSION_H_*/