FDMI filter evaluator description

Collaboration diagram for FDMI filter evaluator description:

Data Structures
struct	m0_fdmi_flt_operands
struct	m0_fdmi_eval_ctx
struct	m0_fdmi_eval_var_info

Typedefs
typedef int(*	m0_fdmi_flt_op_cb_t) (struct m0_fdmi_flt_operands *opnds, struct m0_fdmi_flt_operand *res)

Functions
M0_INTERNAL void	m0_fdmi_eval_init (struct m0_fdmi_eval_ctx *ctx)
M0_INTERNAL int	m0_fdmi_eval_add_op_cb (struct m0_fdmi_eval_ctx *ctx, enum m0_fdmi_flt_op_code op, m0_fdmi_flt_op_cb_t cb)
M0_INTERNAL void	m0_fdmi_eval_del_op_cb (struct m0_fdmi_eval_ctx *ctx, enum m0_fdmi_flt_op_code op)
M0_INTERNAL int	m0_fdmi_eval_flt (struct m0_fdmi_eval_ctx *ctx, struct m0_conf_fdmi_filter *filter, struct m0_fdmi_eval_var_info *var_info)
M0_INTERNAL void	m0_fdmi_eval_fini (struct m0_fdmi_eval_ctx *ctx)

Detailed Description

See also

FDMI Functional Specification

FDMI filter expression public API

Typedef Documentation

m0_fdmi_flt_op_cb_t

typedef int(* m0_fdmi_flt_op_cb_t) (struct m0_fdmi_flt_operands *opnds, struct m0_fdmi_flt_operand *res)

Function type, implementing some operation of FDMI filter tree

Definition at line 51 of file flt_eval.h.

Function Documentation

m0_fdmi_eval_add_op_cb()

M0_INTERNAL int m0_fdmi_eval_add_op_cb	(	struct m0_fdmi_eval_ctx *	ctx,
		enum m0_fdmi_flt_op_code	op,
		m0_fdmi_flt_op_cb_t	cb
	)

Add operation handler to the evaluator context

Can be used by FDMI sources to add operation handlers for data types, specific to these FDMI sources

Parameters

ctx	FDMI filter evaluator context
op	operation code
cb	Handler to be registered

Returns

0 on sucess, error code otherwise

Definition at line 101 of file flt_eval.c.

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m0_fdmi_eval_del_op_cb()

M0_INTERNAL void m0_fdmi_eval_del_op_cb	(	struct m0_fdmi_eval_ctx *	ctx,
		enum m0_fdmi_flt_op_code	op
	)

Delete operation handler from the evaluator context

Parameters

ctx	FDMI filter evaluator context
op	operation code

See also

m0_fdmi_eval_add_op_cb

Definition at line 119 of file flt_eval.c.

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m0_fdmi_eval_fini()

M0_INTERNAL void m0_fdmi_eval_fini

(

struct m0_fdmi_eval_ctx *

ctx

)

Finalize FDMI evaluator

Parameters

ctx	FDMI filter evaluator context

Definition at line 204 of file flt_eval.c.

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m0_fdmi_eval_flt()

M0_INTERNAL int m0_fdmi_eval_flt	(	struct m0_fdmi_eval_ctx *	ctx,
		struct m0_conf_fdmi_filter *	filter,
		struct m0_fdmi_eval_var_info *	var_info
	)

Evaluate filter expression tree value

Result of filter expression is always boolean.

Parameters

filter	FDMI filter
ctx	FDMI filter evaluator context
var_info	Information about how to get value of variable nodes

Returns

<0, if some error occured,
0, if result of evaluation is False
1, if result of evaluation is True

Definition at line 184 of file flt_eval.c.

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m0_fdmi_eval_init()

M0_INTERNAL void m0_fdmi_eval_init

(

struct m0_fdmi_eval_ctx *

ctx

)

Initialize FDMI filter evaluator context

Parameters

ctx	FDMI filter evaluator context

Definition at line 130 of file flt_eval.c.

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