data.h

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// Copyright (C) 2006 Bryan Jacobson <bryanjacobson@users.sourceforge.net>
// This program is licensed under the terms of the GNU General Public License
// version 2, as published by the Free Software Foundation.
// 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.

#ifndef DATA_H
#define DATA_H


class Data
{
  public:
    enum DataType { dtError, dtId, dtNum, dtData, dtText};
             Data(Id attr, Id value, Data *pNext = NULL);      
             Data(Id attr, double number, Data *pNext = NULL); 
             Data(Id attr, Data *pData, Data *pNext = NULL);   
             Data(Id attr, char *str, Data *pNext = NULL);     
    bool     IsUnitNum() { return mType == dtNum || (mType == dtData 
               && mpData->mType == dtNum && mpData->mpNext == NULL); };
    DataType GetType();
    Id       GetAttr() { return mAttr; };
    Id       GetId()   { assert(mType == dtId);   return mId; };
    double   GetNum();
    Data    *GetData() { assert(mType == dtData); return mpData; }
    Data    *GetNext() { return mpNext; }
    Data    *FindAttr(Id attr);
    Data    *FindData(Id data); 

    void     Dump(FILE *fp = stdout, int indent = 0);
    void     Print();             
    void     AppendData(Data *p); 
    void     Insert(Data *p);     

    static Data *Delete(Data **pp, Data *pData);

    static Data* BuildData(Data *p = NULL);
  private:
    DataType mType;  // dtId, dtNum, dtData
    Id       mAttr;
    union
    {
      Id      mId;
      double  mNum;
      Data   *mpData;
      char   *mpText;
    };
    Data *mpNext;
};

#endif // DATA_H

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