94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
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/*
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Copyright (C) 2012 - Juan Ferrer Toribio
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this program; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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*/
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#ifndef DB_CALC_H
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#define DB_CALC_H
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#include <glib-object.h>
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#include <gvn/gvn-param.h>
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#include "db-model.h"
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#define DB_CALC_LOG_DOMAIN (g_quark_from_string ("DbCalc"))
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#define DB_TYPE_CALC (db_calc_get_type ())
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#define DB_CALC(obj) (G_TYPE_CHECK_INSTANCE_CAST (obj, DB_TYPE_CALC, DbCalc))
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#define DB_IS_CALC(obj) (G_TYPE_CHECK_INSTANCE_TYPE (obj, DB_TYPE_CALC))
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#define DB_CALC_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((obj), DB_TYPE_CALC, DbCalcClass))
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#define DB_IS_CALC_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), DB_TYPE_CLASS))
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#define DB_CALC_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), DB_TYPE_CALC, DbCalcClass))
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typedef struct _DbCalc DbCalc;
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typedef struct _DbCalcClass DbCalcClass;
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/**
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* DbCalcFunc:
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* @obj: a #DbCalc
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* @iter: a #DbIter pointing to a row of the model
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* @out: the return position for the resulting value
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* @user_data: (closure): the data passed to the function
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*
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* The prototype of the functions used by the #DbCalc to perform operations
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* on more than one column or to perform additional operations to a column,
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* previously to add them to the calculations performed by the @DbCalc itself.
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**/
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typedef void (*DbCalcFunc) (DbCalc * obj, DbIter * iter, GValue * out, gpointer user_data);
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/**
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* DbCalcOperationType:
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* @DB_CALC_SUM: sumatory of the values
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* @DB_CALC_AVG: average of the values
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*
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* Defines which type of operation will be performed over the column values.
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**/
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typedef enum
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{
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DB_CALC_SUM,
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DB_CALC_AVG
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}
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DbCalcOperationType;
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struct _DbCalc
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{
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GvnParam parent;
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DbModel * model;
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DbCalcOperationType type;
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DbCalcFunc func;
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gpointer data;
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guint col;
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guint count;
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};
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struct _DbCalcClass
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{
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/* <private> */
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GvnParamClass klass;
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};
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GType db_calc_get_type ();
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DbCalc * db_calc_new (DbModel * model
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,DbCalcOperationType type
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,gint col);
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DbCalc * db_calc_new_with_func (DbModel * model
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,DbCalcOperationType type
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,DbCalcFunc func
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,gpointer data);
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#endif
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