hedera/sql/sql-string.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-string.h"

/**
 * SECTION: sql-string
 * @Short_description: an arbitrary SQL string
 * @Title: SqlString
 * 
 * An arbitrary SQL string.
 **/
G_DEFINE_TYPE (SqlString, sql_string, SQL_TYPE_STMT);

SqlString * sql_string_new (const gchar * sql)
{
	return g_object_new (SQL_TYPE_STRING, "sql", sql, NULL);
}

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

static void sql_string_render (SqlString * obj, SqlRender * render)
{
	guint n;
	gsize pos;
	gchar * i = obj->sql;
	GSList * p = obj->params;

	for (n = 0; n < obj->positions->len && p; n++)
	{
		pos = g_array_index (obj->positions, gsize, n);
		g_string_append_len (render->buffer, i, (obj->sql + pos) - i);
		i = obj->sql + pos + 2;

		sql_render_add_object (render, p->data);
		p = p->next;
	}

	sql_render_append (render, i);
}

static gboolean sql_string_is_ready (SqlString * obj)
{
	guint n;
	GSList * p = obj->params;
	
	for (n = 0; n < obj->positions->len && p; n++)
	{
		if (!sql_object_is_ready (p->data))
			return FALSE;
			
		p = p->next;
	}
		
	return n == obj->positions->len;
}

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

void sql_string_add_expr (SqlString * obj, SqlExpr * expr)
{
	g_return_if_fail (SQL_IS_STRING (obj));
	g_return_if_fail (SQL_IS_EXPR (expr));

	sql_object_list_add (SQL_OBJECT (obj), &obj->params, SQL_OBJECT (expr));
}

void sql_string_add_param (SqlString * obj, GvnParam * param)
{
	g_return_if_fail (SQL_IS_STRING (obj));
	g_return_if_fail (GVN_IS_PARAM (param));

	SqlExpr * value = sql_value_new ();
	sql_value_set_param (SQL_VALUE (value), param);
	sql_object_list_add (SQL_OBJECT (obj), &obj->params, SQL_OBJECT (value));
}

void sql_string_add_value (SqlString * obj, GType type, gconstpointer content)
{
	g_return_if_fail (SQL_IS_STRING (obj));

	GValue value = {0};
	SqlExpr * expr;

	gvn_value_new_with_content (&value, type, content);
	expr = sql_value_new ();
	sql_value_set_value (SQL_VALUE (expr), &value);
	sql_object_list_add (SQL_OBJECT (obj), &obj->params, SQL_OBJECT (expr));
	g_value_unset (&value);
}

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

typedef enum
{
	 PROP_SQL = 1
}
SqlStringProp;

static void sql_string_set_property (SqlString * obj, guint id,
	const GValue * value, GParamSpec * pspec)
{
	switch (id)
	{
		case PROP_SQL:
		{
			gchar * n;
		
			obj->sql = g_value_dup_string (value);
			n = obj->sql;
		
			for (; n && *n != '\0'; n++)
			{
				switch (*n)
				{
					case '#':
						if (*(n+1) == 'p')
						{
							gsize pos = n - obj->sql;
							g_array_append_val (obj->positions, pos);
							n++;
						}
						break;
					case '\'':
						do {
							n = g_strstr_len (++n, -1, "'");
						}
						while (n && *(n-1) == '\\');
						break;
				}
			
				if (!n || *n == '\0')
					break;			
			}

			break;
		}
		default:		
			G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, id, pspec);
	}
}

static void sql_string_get_property (SqlString * obj, guint id,
	GValue * value, GParamSpec * pspec)
{	
	switch (id)
	{
		case PROP_SQL:
			g_value_set_string (value, obj->sql);
			break;
		default:		
			G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, id, pspec);
	}
}

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

static void sql_string_init (SqlString * obj)
{
	obj->sql = NULL;
	obj->params = NULL;
	obj->positions = g_array_sized_new (FALSE, FALSE, sizeof (gsize), 5);
}

static void sql_string_finalize (SqlString * obj)
{
	g_free (obj->sql);
	g_array_free (obj->positions, TRUE);
	g_slist_free_full (obj->params, (GDestroyNotify) g_object_unref);
	G_OBJECT_CLASS (sql_string_parent_class)->finalize (G_OBJECT (obj));
}

static void sql_string_class_init (SqlStringClass * k)
{
	GObjectClass * klass = G_OBJECT_CLASS (k);
	klass->finalize = (GObjectFinalizeFunc) sql_string_finalize;
	klass->set_property = (GObjectSetPropertyFunc) sql_string_set_property;
	klass->get_property = (GObjectGetPropertyFunc) sql_string_get_property;
	SQL_OBJECT_CLASS (klass)->render = (SqlRenderFunc) sql_string_render;
	SQL_OBJECT_CLASS (klass)->is_ready = (SqlObjectIsReadyFunc) sql_string_is_ready;

	g_object_class_install_property (klass, PROP_SQL,
		g_param_spec_string ("sql"
			,_("SQL")
			,_("An arbitrary SQL string")
			,NULL
			,G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY
	));
}