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#ifndef CMPI_Wql2Dnf_h
#define CMPI_Wql2Dnf_h

#include <Pegasus/Provider/CMPI/cmpidt.h>

#include <Pegasus/Common/Stack.h>
#include <Pegasus/WQL/WQLOperation.h>
#include <Pegasus/WQL/WQLOperand.h>
#include <Pegasus/WQL/WQLSelectStatement.h>
#include "CMPI_Query2Dnf.h"
#include <Pegasus/Common/ArrayInternal.h>
#include <Pegasus/Common/Linkage.h>
#include <Pegasus/Common/Tracer.h>

PEGASUS_NAMESPACE_BEGIN


class term_el_WQL
{
public:
    term_el_WQL()
    {
    }
    term_el_WQL(Boolean m, WQLOperation o, WQLOperand op1, WQLOperand op2) :
    mark(m), op(o), opn1(op1), opn2(op2)
    {
    }
    Boolean mark;
    WQLOperation op;
    WQLOperand opn1;
    WQLOperand opn2;

    void negate(void);
    // int toStrings(CMPIType &typ, CMPIPredOp &opr, String &o1, String &o2)
    // const;
};

class CMPI_stack_el
{
public:
    CMPI_stack_el()
    {
    }
    CMPI_stack_el(int o, Boolean i) : opn(o), is_terminal(i)
    {
    }
    int   opn;

    // either to terminals or eval_heap
    Boolean is_terminal;
};


class CMPI_eval_el
{
public:
    CMPI_eval_el()
    {
    }
    CMPI_eval_el(
    Boolean m, WQLOperation o,
    int op1, Boolean i1, int op2, Boolean i2) :
    mark(m), op(o), opn1(op1),
    is_terminal1(i1),opn2(op2), is_terminal2(i2)
    {
    }

    Boolean mark;
    WQLOperation op;
    int opn1;
    Boolean is_terminal1; // if yes, look in terminal Array
    int opn2;
    Boolean is_terminal2; // if no, look in eval heap

    CMPI_stack_el getFirst();

    CMPI_stack_el getSecond();

    void setFirst(const CMPI_stack_el s);

    void setSecond(const CMPI_stack_el s);

    void assign_unary_to_first(const CMPI_eval_el & assignee);

    void assign_unary_to_second(const CMPI_eval_el & assignee);

    // Ordering operators, so that op1 > op2 for all non-terminals
    // and terminals appear in the second operand first
    void order(void);
};

typedef Array<term_el_WQL> TableauRow_WQL;

typedef Array<TableauRow_WQL> Tableau_WQL;


class CMPI_Wql2Dnf
{
public:
    CMPI_Wql2Dnf();

    CMPI_Wql2Dnf(const String &condition, const String &pref);

    ~CMPI_Wql2Dnf();

    void compile (const WQLSelectStatement * wqs);

    CMPI_Tableau *getTableau()
    {
        return &_CMPI_tableau;
    }

protected:
    void _populateTableau(void);

    void _buildEvalHeap(const WQLSelectStatement * wqs);

    void _pushNOTDown(void);

    void _factoring(void);

    void _gatherDisj(Array<CMPI_stack_el>& stk);

    void _gatherConj(Array<CMPI_stack_el>& stk, CMPI_stack_el sel);

    void _gather(Array<CMPI_stack_el>& stk, CMPI_stack_el sel,Boolean or_flag);


    // Structure to contain the compiled DNF form

    Tableau_WQL _tableau;
    CMPI_Tableau _CMPI_tableau;

    //
    // The eval_heap structure contains an ordered tree of non-terminal
    // expressions, the term_heap structure the corresponding terminal
    // expressions
    //

    Stack<term_el_WQL> terminal_heap;

    Array<CMPI_eval_el> eval_heap;

    //friend WQLSelectStatement;
};

PEGASUS_NAMESPACE_END

#endif /* CMPI_Wql2Dnf_h */