initial commit

src/Column.h

@@ -0,0 +1,95 @@
+// +------------------------------------------------------------------+
+// |             ____ _               _        __  __ _  __           |
+// |            / ___| |__   ___  ___| | __   |  \/  | |/ /           |
+// |           | |   | '_ \ / _ \/ __| |/ /   | |\/| | ' /            |
+// |           | |___| | | |  __/ (__|   <    | |  | | . \            |
+// |            \____|_| |_|\___|\___|_|\_\___|_|  |_|_|\_\           |
+// |                                                                  |
+// | Copyright Mathias Kettner 2014             mk@mathias-kettner.de |
+// +------------------------------------------------------------------+
+//
+// This file is part of Check_MK.
+// The official homepage is at http://mathias-kettner.de/check_mk.
+//
+// check_mk is free software;  you can redistribute it and/or modify it
+// under the  terms of the  GNU General Public License  as published by
+// the Free Software Foundation in version 2.  check_mk is  distributed
+// in the hope that it will be useful, but WITHOUT ANY WARRANTY;  with-
+// out even the implied warranty of  MERCHANTABILITY  or  FITNESS FOR A
+// PARTICULAR PURPOSE. See the  GNU General Public License for more de-
+// tails. You should have  received  a copy of the  GNU  General Public
+// License along with GNU Make; see the file  COPYING.  If  not,  write
+// to the Free Software Foundation, Inc., 51 Franklin St,  Fifth Floor,
+// Boston, MA 02110-1301 USA.
+
+#ifndef Column_h
+#define Column_h
+
+#include "config.h"  // IWYU pragma: keep
+#include <chrono>
+#include <cstddef>
+#include <functional>
+#include <memory>
+#include <string>
+#include "Filter.h"
+#include "Row.h"
+#include "contact_fwd.h"
+#include "opids.h"
+class Aggregation;
+class Aggregator;
+class Logger;
+class RowRenderer;
+
+template <typename T>
+const T *offset_cast(const void *ptr, size_t offset) {
+    // cppcheck is too dumb to see that this is just pointer arithmetic... :-/
+    // cppcheck-suppress invalidPointerCast
+    return reinterpret_cast<const T *>(reinterpret_cast<const char *>(ptr) +
+                                       offset);
+}
+
+enum class ColumnType { int_, double_, string, list, time, dict, blob, null };
+
+using AggregationFactory = std::function<std::unique_ptr<Aggregation>()>;
+
+class Column {
+public:
+    Column(std::string name, std::string description, int indirect_offset,
+           int extra_offset, int extra_extra_offset, int offset);
+    virtual ~Column() = default;
+
+    [[nodiscard]] std::string name() const { return _name; }
+    [[nodiscard]] std::string description() const { return _description; }
+
+    template <typename T>
+    [[nodiscard]] const T *columnData(Row row) const {
+        return static_cast<const T *>(shiftPointer(row));
+    }
+
+    [[nodiscard]] virtual ColumnType type() const = 0;
+
+    virtual void output(Row row, RowRenderer &r, const contact *auth_user,
+                        std::chrono::seconds timezone_offset) const = 0;
+
+    [[nodiscard]] virtual std::unique_ptr<Filter> createFilter(
+        Filter::Kind kind, RelationalOperator relOp,
+        const std::string &value) const = 0;
+
+    [[nodiscard]] virtual std::unique_ptr<Aggregator> createAggregator(
+        AggregationFactory factory) const = 0;
+
+    [[nodiscard]] Logger *logger() const { return _logger; }
+
+private:
+    Logger *const _logger;
+    std::string _name;
+    std::string _description;
+    int _indirect_offset;
+    int _extra_offset;
+    int _extra_extra_offset;
+    int _offset;
+
+    [[nodiscard]] const void *shiftPointer(Row row) const;
+};
+
+#endif  // Column_h