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Annotation of parser3/src/include/pa_table.h, revision 1.48.2.1

1.14      paf         1: /** @file
1.15      paf         2:        Parser: table class decl.
                      3: 
1.48      paf         4:        Copyright (c) 2001, 2003 ArtLebedev Group (http://www.artlebedev.com)
1.41      paf         5:        Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.1       paf         6: */
                      7: 
                      8: #ifndef PA_TABLE_H
                      9: #define PA_TABLE_H
1.45      paf        10: 
1.48.2.1! paf        11: static const char* IDENT_TABLE_H="$Date: 2003/01/21 15:51:12 $";
1.1       paf        12: 
                     13: #include "pa_types.h"
                     14: #include "pa_array.h"
                     15: #include "pa_hash.h"
1.2       paf        16: #include "pa_string.h"
1.1       paf        17: 
1.16      paf        18: /** 
1.19      paf        19:        VTable backend.
1.16      paf        20: 
                     21:        holds:
1.14      paf        22:        - column names[if any]
                     23:        - data rows
                     24:        - current row pointer
                     25: 
                     26:        uses String for column names and data items
                     27: 
1.28      paf        28:        hence most of tables are "named", no need to uptimize nameless onces.
                     29:        rows and strings stored are read-only. once stored they can be removed,
                     30:        but not altered. that's handy for quick copying & co. see table:join
1.14      paf        31: */
1.48.2.1! paf        32: class Table: public Array<object_ptr<const Array<object_ptr<const String> > > > {
1.1       paf        33: public:
                     34: 
1.48.2.1! paf        35:        Table(
        !            36:                object_ptr<const String> aorigin_string,
        !            37:                object_ptr<const Array<const String> > acolumns,
        !            38:                int initial_rows=3);
        !            39:        Table(const Table& src, int offset=0, int limit=0);
1.2       paf        40: 
1.21      paf        41:        /// where this table came from, may be NULL
1.48.2.1! paf        42:        object_ptr<const String> origin_string() { return forigin_string; }
1.21      paf        43: 
1.42      paf        44:        /// gets column names
1.48.2.1! paf        45:        object_ptr<const Array<const String> > columns() { return fcolumns; }
1.5       paf        46: 
1.18      paf        47:        /// moves @a current pointer
1.5       paf        48:        void set_current(int acurrent) { fcurrent=acurrent; }
1.17      paf        49:        /// @return current pointer
1.47      paf        50:        int current() const { return fcurrent; }
1.37      paf        51:        void offset(bool absolute, int offset);
1.5       paf        52: 
1.32      paf        53:        /** @return column index from @a column_name. '<0' if no such column
1.48.2.1! paf        54:                if no such - 'bark'
1.32      paf        55:        */
1.48.2.1! paf        56:        int column_name2index(object_ptr<const String> column, bool bark) const;
1.30      paf        57: 
1.26      paf        58:        /// @return item from @a column
                     59:        const String *item(int column) const;
1.30      paf        60: 
                     61:        /// @return item from @a column. '0' if no such column
1.48.2.1! paf        62:        object_ptr<const String> item(object_ptr<const String> column) const {
1.32      paf        63:                int index=column_name2index(column, false);
1.30      paf        64:                return index>=0?item(index):0;
1.24      paf        65:        }
1.23      paf        66: 
                     67:        /// saves to text file
                     68:        void save(bool nameless_save, const String& file_spec);
1.2       paf        69: 
1.26      paf        70:        bool locate(int column, const String& value);
1.31      paf        71:        bool locate(const String& column, const String& value);
1.24      paf        72: 
1.48.2.1! paf        73:        element_type at(int index) const {
        !            74:                return get(index);
1.27      paf        75:        }
                     76: 
1.12      paf        77: private:
1.21      paf        78:        
                     79:        // where this table came from, may be NULL
1.48.2.1! paf        80:        object_ptr<const String> forigin_string;
1.1       paf        81: 
1.5       paf        82:        // current row
                     83:        int fcurrent;
                     84: 
                     85:        // columns
1.48.2.1! paf        86:        object_ptr<const Array<const String> > fcolumns;
        !            87: 
        !            88:        // column names are already referenced in fcolumns, no need to doublecheck references here
        !            89:        // column name->number lookup table
        !            90:        typedef Hash<String, int> name2number_hash_class;
        !            91:        object_ptr<name2number_hash_class> name2number;
        !            92: 
        !            93:        // we own columns?
1.5       paf        94: 
1.48.2.1! paf        95:        bool valid(int index) const { return index>=0 && index<count(); }
1.2       paf        96: 
1.1       paf        97: };
                     98: 
                     99: #endif