hedera/sql/sql-subquery.c

/*
 * Copyright (C) 2012 - Juan Ferrer Toribio
 *
 * This program 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, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include "sql-subquery.h"

/**
 * SECTION: sql-subquery
 * @Short_description: an #SqlTarget containing an #SqlSelect
 * @Title: SqlSubquery
 * 
 * An #SqlTarget containing an #SqlSelect, used to add a sub-query to the
 * targets field in an SQL query.
 **/
G_DEFINE_TYPE (SqlSubquery, sql_subquery, SQL_TYPE_TARGET);

SqlSubquery * sql_subquery_new (SqlSelect * select)
{
	return g_object_new (SQL_TYPE_SUBQUERY, "select", select, NULL);
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++ Private

static void sql_subquery_render (SqlSubquery * obj, SqlRender * render)
{
	if (obj->select)
	{
		sql_render_append (render, "(");
		sql_render_add_item (render, TRUE, NULL, obj->select);
		sql_render_append (render, ")");
	}
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++ Public

void sql_subquery_set_select (SqlSubquery * obj, SqlSelect * select)
{
	g_return_if_fail (SQL_IS_SUBQUERY (obj));
	g_return_if_fail (SQL_IS_SELECT (select) || !select);

	sql_object_remove (obj, obj->select);
	obj->select = sql_object_add (obj, select);
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++ Properties

enum
{
	 PROP_SELECT = 1
};

static void sql_subquery_set_property (SqlSubquery * obj, guint id,
	const GValue * value, GParamSpec * pspec)
{
	switch (id)
	{
		case PROP_SELECT:
			sql_subquery_set_select (obj, g_value_get_object (value));
			break;
		default:		
			G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, id, pspec);
	}
}

static void sql_subquery_get_property (SqlSubquery * obj, guint id,
	GValue * value, GParamSpec * pspec)
{	
	switch (id)
	{
		case PROP_SELECT:
			g_value_set_object (value, obj->select);
			break;
		default:		
			G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, id, pspec);
	}
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++ Class

static void sql_subquery_init (SqlSubquery * obj)
{
	obj->select = NULL;
}

static void sql_subquery_finalize (SqlSubquery * obj)
{
	sql_object_remove (obj, obj->select);
	G_OBJECT_CLASS (sql_subquery_parent_class)->finalize (G_OBJECT (obj));
}

static void sql_subquery_class_init (SqlSubqueryClass * klass)
{
	GObjectClass * k = G_OBJECT_CLASS (klass);
	k->finalize = (GObjectFinalizeFunc) sql_subquery_finalize;
	k->set_property = (GObjectSetPropertyFunc) sql_subquery_set_property;
	k->get_property = (GObjectGetPropertyFunc) sql_subquery_get_property;
	SQL_OBJECT_CLASS (klass)->render = (SqlRenderFunc) sql_subquery_render;

	g_object_class_install_property (k, PROP_SELECT,
		sql_param_object ("select"
			,"Select"
			,"The SELECT statement"
			,SQL_TYPE_SELECT
			,G_PARAM_READWRITE
	));
}