hedera/sql/sql-join.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-join.h"
#include "sql-field.h"
#include "sql-holder.h"

/**
 * SECTION: sql-join
 * @Short_description: the equivalent of the SQL JOIN.
 * @Title: SqlJoin
 * 
 * The #SqlJoin represents a joins between any targets.
 **/
G_DEFINE_TYPE (SqlJoin, sql_join, SQL_TYPE_TARGET);

SqlObject * sql_join_new (SqlTarget * left, SqlTarget * right, SqlJoinType type)
{
	return g_object_new (SQL_TYPE_JOIN
		,"target-left"	,left
	    ,"target-right"	,right
	    ,"join-type"	,type
		,NULL
	);
}

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

static const gchar * SQL_JOIN_TYPE[] =
{
	 "INNER"
	,"LEFT"
	,"RIGHT"
};

static void sql_join_render (SqlJoin * self, SqlRender * render)
{
	sql_render_add_item (render, TRUE, NULL, self->target_left);
	sql_render_add_token (render, SQL_JOIN_TYPE[self->type]);
	sql_render_add_token (render, "JOIN");
	sql_render_add_item (render, TRUE, NULL, self->target_right);
	
	if (self->has_using)
	{
		sql_render_add_token (render, "USING");
		sql_render_append (render, "(");
		sql_render_add_list (render, TRUE, NULL, self->using_fields, ",");
		sql_render_append (render, ")");
	}
	else
		sql_render_add_item (render, FALSE, "ON", self->condition);
}

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

SqlJoinType sql_join_get_join_type (SqlJoin * self)
{
	g_return_if_fail (SQL_IS_JOIN (self));
	
	return self->type;
}

void sql_join_set_target_left (SqlJoin * self, SqlTarget * target)
{
	g_return_if_fail (SQL_IS_JOIN (self));
	g_return_if_fail (SQL_IS_TARGET (target) || SQL_IS_HOLDER (target) || !target);

	sql_object_remove (self, self->target_left);
	self->target_left = sql_object_add (self, target);
}

void sql_join_set_target_right (SqlJoin * self, SqlTarget * target)
{
	g_return_if_fail (SQL_IS_JOIN (self));
	g_return_if_fail (SQL_IS_TARGET (target) || SQL_IS_HOLDER (target) || !target);

	sql_object_remove (self, self->target_right);
	self->target_right = sql_object_add (self, target);
}

void sql_join_set_condition (SqlJoin * self, SqlExpr * condition)
{
	g_return_if_fail (SQL_IS_JOIN (self));
	g_return_if_fail (SQL_IS_EXPR (condition) || SQL_IS_HOLDER (condition) || !condition);

	sql_object_remove (self, self->condition);
	self->condition = sql_object_add (self, condition);
}

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

enum
{
	 PROP_TARGET_LEFT = 1
	,PROP_TARGET_RIGHT
	,PROP_TYPE
	,PROP_CONDITION
	,PROP_HAS_USING
	,PROP_USING_FIELDS
};

static void sql_join_set_property (SqlJoin * self, guint id,
	const GValue * value, GParamSpec * pspec)
{
	switch (id)
	{
		case PROP_TARGET_LEFT:
			sql_join_set_target_left (self, g_value_get_object (value));
			break;
		case PROP_TARGET_RIGHT:
			sql_join_set_target_right (self, g_value_get_object (value));
			break;
		case PROP_TYPE:
			self->type = g_value_get_enum (value);
			break;
		case PROP_CONDITION:
			sql_join_set_condition (self, g_value_get_object (value));
			break;
		case PROP_HAS_USING:
			self->has_using = g_value_get_boolean (value);
			break;
		case PROP_USING_FIELDS:
			sql_object_remove (self, self->using_fields);
			self->using_fields = sql_object_add (self, g_value_get_object (value));
			break;
		default:
			G_OBJECT_WARN_INVALID_PROPERTY_ID (self, id, pspec);
	}
}

static void sql_join_get_property (SqlJoin * self, guint id,
	GValue * value, GParamSpec * pspec)
{	
	switch (id)
	{
		case PROP_TARGET_LEFT:
			g_value_set_object (value, self->target_left);
			break;
		case PROP_TARGET_RIGHT:
			g_value_set_object (value, self->target_right);
			break;
		case PROP_TYPE:
			g_value_set_enum (value, self->type);
			break;
		case PROP_CONDITION:
			g_value_set_object (value, self->condition);
			break;
		case PROP_HAS_USING:
			g_value_set_boolean (value, self->has_using);
			break;
		case PROP_USING_FIELDS:
			g_value_set_object (value, self->using_fields);
			break;
		default:		
			G_OBJECT_WARN_INVALID_PROPERTY_ID (self, id, pspec);
	}
}

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

static void sql_join_init (SqlJoin * self)
{	
	self->target_left = NULL;
	self->target_right = NULL;
	self->condition = NULL;
	self->using_fields = NULL;
}

static void sql_join_finalize (SqlJoin * self)
{
	sql_object_remove (self, self->target_left);
	sql_object_remove (self, self->target_right);
	sql_object_remove (self, self->condition);
	sql_object_remove (self, self->using_fields);
	G_OBJECT_CLASS (sql_join_parent_class)->finalize (G_OBJECT (self));
}

static void sql_join_class_init (SqlJoinClass * klass)
{
	GObjectClass * k = G_OBJECT_CLASS (klass);
	k->finalize = (GObjectFinalizeFunc) sql_join_finalize;
	k->set_property = (GObjectSetPropertyFunc) sql_join_set_property;
	k->get_property = (GObjectGetPropertyFunc) sql_join_get_property;
	SQL_OBJECT_CLASS (klass)->render = (SqlRenderFunc) sql_join_render;

	g_object_class_install_property (k, PROP_TARGET_LEFT,
		sql_param_list ("target-left"
			,("Left target")
			,("The left target in the join")
			,SQL_TYPE_TARGET
			,G_PARAM_READWRITE
	));
	g_object_class_install_property (k, PROP_TARGET_RIGHT,
		sql_param_list ("target-right"
			,("Right target")
			,("The right target in the join")
			,SQL_TYPE_TARGET
			,G_PARAM_READWRITE
	));
	g_object_class_install_property (k, PROP_TYPE,
		g_param_spec_enum ("join-type"
			,("Type")
			,("The type of join")
			,SQL_TYPE_JOIN_TYPE
			,SQL_JOIN_TYPE_INNER
			,G_PARAM_READWRITE
	));
	g_object_class_install_property (k, PROP_CONDITION,
		sql_param_list ("condition"
			,("Condition")
			,("The condition used for the join")
			,SQL_TYPE_EXPR
			,G_PARAM_READWRITE
	));
	g_object_class_install_property (k, PROP_HAS_USING,
		g_param_spec_boolean ("has-using"
			,("Has using")
			,("Wether the condition is a USING")
			,FALSE
			,G_PARAM_READWRITE | G_PARAM_CONSTRUCT 
	));
	g_object_class_install_property (k, PROP_CONDITION,
		sql_param_list ("using-fields"
			,("Using fields")
			,("The list of fields of the USING")
			,SQL_TYPE_FIELD
			,G_PARAM_READWRITE | G_PARAM_CONSTRUCT
	));
}

GType sql_join_type_get_type ()
{
	static GType type = 0;

	if (type == 0)
	{
		static const GEnumValue values[] =
		{
			  {SQL_JOIN_TYPE_INNER	,"SQL_JOIN_TYPE_INNER"	,"inner"
			},{SQL_JOIN_TYPE_LEFT	,"SQL_JOIN_TYPE_LEFT"	,"left"
			},{SQL_JOIN_TYPE_RIGHT	,"SQL_JOIN_TYPE_RIGHT"	,"right"
			},{0, NULL, NULL}
		};

		type = g_enum_register_static
			(g_intern_static_string ("SqlJoinType"), values);
	}

	return type;
}