/*
 * 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-dml.h"

/**
 * SECTION: sql-dml
 * @Short_description: parent class of data manipulation statements.
 * @Title: SqlDml
 * 
 * The #SqlDml is the base class for all SQL statements that manipulate data.
 **/
G_DEFINE_ABSTRACT_TYPE (SqlDml, sql_dml, SQL_TYPE_STMT);

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

/**
 * sql_dml_add_target:
 * @obj: a #SqlDml
 * @target: a #SqlTarget
 *
 * Add a target to the DML statement.
 **/
void sql_dml_add_target (SqlDml * obj, SqlTarget * target)
{
	g_return_if_fail (SQL_IS_DML (obj));
	g_return_if_fail (SQL_IS_TARGET (target));

	obj->target = g_slist_append (obj->target, g_object_ref_sink (target));
}

/**
 * sql_dml_set_where:
 * @obj: a #SqlDml
 * @expr: a #SqlExpr
 *
 * Sets the where expression of an DML statement.
 **/
void sql_dml_set_where (SqlDml * obj, SqlExpr * where)
{
	g_return_if_fail (SQL_IS_DML (obj));
	g_return_if_fail (SQL_IS_EXPR (where));

	g_clear_object (&obj->where);
	obj->where = g_object_ref_sink (where);
}

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

enum
{
	 PROP_WHERE = 1
};

static void sql_dml_set_property (SqlDml * obj, guint id,
	const GValue * value, GParamSpec * pspec)
{
	switch (id)
	{
		case PROP_WHERE:
			sql_dml_set_where (obj, g_value_get_object (value));
			break;
		default:		
			G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, id, pspec);
	}
}

static void sql_dml_get_property (SqlDml * obj, guint id,
	GValue * value, GParamSpec * pspec)
{	
	switch (id)
	{
		case PROP_WHERE:
			g_value_set_object (value, obj->where);
			break;
		default:		
			G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, id, pspec);
	}
}

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

static void sql_dml_finalize (SqlDml * obj)
{
	g_clear_object (&obj->where);
	g_slist_free_full (obj->target, g_object_unref);
	G_OBJECT_CLASS (sql_dml_parent_class)->finalize (G_OBJECT (obj));
}

static void sql_dml_init (SqlDml * obj)
{
	obj->target = NULL;
	obj->where = NULL;
}

static void sql_dml_class_init (SqlDmlClass * k)
{
	GObjectClass * klass = G_OBJECT_CLASS (k);
	klass->finalize = (GObjectFinalizeFunc) sql_dml_finalize;
	klass->set_property = (GObjectSetPropertyFunc) sql_dml_set_property;
	klass->get_property = (GObjectGetPropertyFunc) sql_dml_get_property;

	g_object_class_install_property (klass, PROP_WHERE,
		g_param_spec_object ("where"
			,"Where"
			,"The expression used to filter rows, it's the WHERE section of an statement"
			,SQL_TYPE_EXPR
			,G_PARAM_READWRITE
	));
}