class QgsSearchTreeNode
{
%TypeHeaderCode
#include "qgssearchtreenode.h"
%End

  public:
    //! defines possible types of node
    enum Type
    {
      tOperator = 1,
      tNumber,
      tColumnRef,
      tString
    };

    //! possible operators
    enum Operator
    {
      // binary
      opAND = 1,
      opOR,
      opNOT,

      // arithmetic
      opPLUS,
      opMINUS,
      opMUL,
      opDIV,
      opPOW,
      opSQRT,
      opSIN,
      opCOS,
      opTAN,
      opASIN,
      opACOS,
      opATAN,

      // conversion
      opTOINT,
      opTOREAL,
      opTOSTRING,

      // measuring
      opLENGTH,
      opAREA,

      // feature id
      opID,

      // comparison
      opEQ,   // =
      opNE,   // != resp. <>
      opGT,   // >
      opLT,   // <
      opGE,   // >=
      opLE,   // <=
      opRegexp, // ~
      opLike,  // LIKE

      // string handling
      opCONCAT,

      opROWNUM
    };

    //! constructors
    QgsSearchTreeNode( double number );
    QgsSearchTreeNode( Operator o, QgsSearchTreeNode* left, QgsSearchTreeNode* right );
    QgsSearchTreeNode( QString text, bool isColumnRef );

    //! copy contructor - copies whole tree!
    QgsSearchTreeNode( const QgsSearchTreeNode& node );

    //! destructor - deletes children nodes (if any)
    ~QgsSearchTreeNode();

    //! returns type of current node
    Type type() const;

    //! node value getters
    Operator op() const;
    double number() const;
    QString columnRef() const;
    QString string() const;

    //! node value setters (type is set also)
    void setOp( Operator o );
    void setNumber( double number );
    void setColumnRef( const QString& str );
    void setString( const QString& str );

    //! children
    QgsSearchTreeNode* Left();
    QgsSearchTreeNode* Right();
    void setLeft( QgsSearchTreeNode* left );
    void setRight( QgsSearchTreeNode* right );

    //! returns search string that should be equal to original parsed string
    QString makeSearchString();

    //! checks whether the node tree is valid against supplied attributes
    //! @note attributes and optional geom parameter replace with feature in 1.6
    bool checkAgainst( const QMap<int,QgsField>& fields, QgsFeature &f );

    //! @deprecated
    bool checkAgainst( const QMap<int,QgsField>& fields, const QMap<int, QVariant>& attributes, QgsGeometry* geom = 0 ) /Deprecated/;

    //! checks if there were errors during evaluation
    bool hasError();

    //! returns error message
    const QString& errorMsg();

    //! wrapper around valueAgainst()
    //! @note added in 1.4
    //! @note attribute/geom replaced by feature in 1.6
    bool getValue( QgsSearchTreeValue& value /Out/, QgsSearchTreeNode* node,
                   const QMap<int,QgsField>& fields, QgsFeature &f );

    //! @deprecated
    bool getValue( QgsSearchTreeValue& value /Out/, QgsSearchTreeNode* node,
                   const QMap<int,QgsField>& fields, const QMap<int,QVariant>& attributes, QgsGeometry* geom = 0 ) /Deprecated/;

    //! return a list of referenced columns in the tree
    //! @note added in 1.5
    QStringList referencedColumns();

    //! return a list of all attribute nodes
    //! @note added in 1.5
    QList<QgsSearchTreeNode*> columnRefNodes();

    //! check whether there are any operators that need geometry (for area, length)
    //! @note added in 1.5
    bool needsGeometry();

    //! return quoted column reference (in double quotes)
    //! @note added in 1.5
    static QString quotedColumnRef( QString name );

    //! Set current row number within this tree.
    //! This value is stored only in the nodes being $rownum operator - in mNumber
    //! @note added in 1.6
    void setCurrentRowNumber( int rownum );

  protected:
    //! returns scalar value of node
    //! @note attribute/geom replaced by feature in 1.6
    QgsSearchTreeValue valueAgainst( const QMap<int,QgsField>& fields, QgsFeature &f );

    //! @deprecated
    QgsSearchTreeValue valueAgainst( const QMap<int,QgsField>& fields, const QMap<int,QVariant>& attributes, QgsGeometry* geom = 0 ) /Deprecated/;

    //! strips mText when node is of string type
    void stripText();
};


class QgsSearchTreeValue
{
%TypeHeaderCode
#include "qgssearchtreenode.h"
%End

  public:

    enum Type
    {
      valError,
      valString,
      valNumber
    };

    QgsSearchTreeValue();
    QgsSearchTreeValue( QString string );
    QgsSearchTreeValue( double number );
    QgsSearchTreeValue( int error, QString errorMsg );

    static int compare( QgsSearchTreeValue& value1, QgsSearchTreeValue& value2,
                        Qt::CaseSensitivity = Qt::CaseSensitive );

    bool isNumeric();
    bool isError();

    QString& string();
    double number();

};