/*
 *	PROGRAM:	JRD Access Method
 *	MODULE:		met.h
 *	DESCRIPTION:	Random meta-data stuff
 *
 * The contents of this file are subject to the Interbase Public
 * License Version 1.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy
 * of the License at http://www.Inprise.com/IPL.html
 *
 * Software distributed under the License is distributed on an
 * "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express
 * or implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code was created by Inprise Corporation
 * and its predecessors. Portions created by Inprise Corporation are
 * Copyright (C) Inprise Corporation.
 *
 * All Rights Reserved.
 * Contributor(s): ______________________________________.
 */

#ifndef JRD_MET_H
#define JRD_MET_H

/* Record types for record summary blob records */

typedef enum rsr_t {
	RSR_field_id,
	RSR_field_name,
	RSR_view_context,
	RSR_base_field,
	RSR_computed_blr,
	RSR_missing_value,
	RSR_default_value,
	RSR_validation_blr,
	RSR_security_class,
	RSR_trigger_name,
	RSR_dimensions,
	RSR_array_desc,

	RSR_relation_id,			/* The following are Gateway specific */
	RSR_relation_name,			/* and are used to speed the acquiring */
	RSR_rel_sys_flag,			/* of relation information */
	RSR_view_blr,
	RSR_owner_name,
	RSR_field_type,				/* The following are also Gateway */
	RSR_field_scale,			/* specific and relate to field info */
	RSR_field_length,
	RSR_field_sub_type,
	RSR_field_not_null
} RSR_T;

/* Temporary field block */

class TemporaryField : public pool_alloc<type_tfb>
{
    public:
	TemporaryField*	tfb_next;		/* next block in chain */
	USHORT			tfb_id;				/* id of field in relation */
	USHORT			tfb_flags;
	DSC				tfb_desc;
};

#define TFB_computed		1
#define TFB_array			2

#define MET_object_active	0
#define MET_object_inactive	1
#define MET_object_unknown	2

#define TRIGGER_PRE_STORE	1
#define TRIGGER_POST_STORE	2
#define TRIGGER_PRE_MODIFY	3
#define TRIGGER_POST_MODIFY	4
#define TRIGGER_PRE_ERASE	5
#define TRIGGER_POST_ERASE	6
#define TRIGGER_MAX			7

// trigger type prefixes
#define TRIGGER_PRE			0
#define TRIGGER_POST		1

// trigger type suffixes
#define TRIGGER_STORE		1
#define TRIGGER_MODIFY		2
#define TRIGGER_ERASE		3

// that's how trigger action types are encoded
/*
	bit 0 = TRIGGER_PRE/TRIGGER_POST flag,
	bits 1-2 = TRIGGER_STORE/TRIGGER_MODIFY/TRIGGER_ERASE (slot #1),
	bits 3-4 = TRIGGER_STORE/TRIGGER_MODIFY/TRIGGER_ERASE (slot #2),
	bits 5-6 = TRIGGER_STORE/TRIGGER_MODIFY/TRIGGER_ERASE (slot #3),
	and finally the above calculated value is decremented

example #1:
	TRIGGER_POST_ERASE =
	= ((TRIGGER_ERASE << 1) | TRIGGER_POST) - 1 =
	= ((3 << 1) | 1) - 1 =
	= 0x00000110 (6)

example #2:
	TRIGGER_PRE_STORE_MODIFY =
	= ((TRIGGER_MODIFY << 3) | (TRIGGER_STORE << 1) | TRIGGER_PRE) - 1 =
	= ((2 << 3) | (1 << 1) | 0) - 1 =
	= 0x00010001 (17)

example #3:
	TRIGGER_POST_MODIFY_ERASE_STORE =
	= ((TRIGGER_STORE << 5) | (TRIGGER_ERASE << 3) | (TRIGGER_MODIFY << 1) | TRIGGER_POST) - 1 =
	= ((1 << 5) | (3 << 3) | (2 << 1) | 1) - 1 =
	= 0x00111100 (60)
*/

// that's how trigger types are decoded
#define TRIGGER_ACTION(value, shift) \
	(((((value + 1) >> shift) & 3) << 1) | ((value + 1) & 1)) - 1

#define TRIGGER_ACTION_SLOT(value, slot) \
	TRIGGER_ACTION(value, (slot * 2 - 1) )

#define TRIGGER_COMBINED_MAX 128

#include "../jrd/obj.h"

#endif /* JRD_MET_H */