kvp_frame.h File Reference

A key-value frame system. More...

#include "gnc-date.h"
#include "gnc-numeric.h"
#include "guid.h"

Go to the source code of this file.

Defines

#define QOF_MOD_KVP   "qof.kvp"
#define kvp_frame   KvpFrame
#define kvp_value   KvpValue
#define kvp_value_t   KvpValueType

Typedefs

typedef struct _KvpFrame KvpFrame
typedef struct _KvpValue KvpValue

Enumerations

enum  KvpValueType {
  KVP_TYPE_GINT64 = 1, KVP_TYPE_DOUBLE, KVP_TYPE_NUMERIC, KVP_TYPE_STRING,
  KVP_TYPE_GUID, KVP_TYPE_TIMESPEC, KVP_TYPE_BINARY, KVP_TYPE_GLIST,
  KVP_TYPE_FRAME, KVP_TYPE_GDATE
}
 possible types in the union KvpValue More...

Functions

gchar * kvp_value_to_bare_string (const KvpValue *val)
 General purpose function to convert any KvpValue to a string.
gchar * kvp_value_to_string (const KvpValue *val)
 Debug version of kvp_value_to_string.
gboolean kvp_value_binary_append (KvpValue *v, void *data, guint64 size)
gchar * kvp_frame_to_string (const KvpFrame *frame)
gchar * binary_to_string (const void *data, guint32 size)
gchar * kvp_value_glist_to_string (const GList *list)
GHashTable * kvp_frame_get_hash (const KvpFrame *frame)
KvpFrame Constructors
KvpFramekvp_frame_new (void)
void kvp_frame_delete (KvpFrame *frame)
KvpFramekvp_frame_copy (const KvpFrame *frame)
gboolean kvp_frame_is_empty (const KvpFrame *frame)
KvpFrame URL handling
void kvp_frame_add_url_encoding (KvpFrame *frame, const gchar *enc)
KvpFrame Value Fetching
Value accessors. These all take a unix-style slash-separated path as an argument, and return the value stored at that location. If the object at the end of that path is not of the type that was asked for, then a NULL or a zero is returned. So, for example, asking for a string when the path stored an int will return a NULL. In some future date, this may be changed to a looser type system, such as perl's automatic re-typing (e.g. an integer value might be converted to a printed string representing that value).

If any part of the path does not exist, then NULL or zero will be returned.

The values returned for GUID, binary, GList, KvpFrame and string are "non-copying" -- the returned item is the actual item stored. Do not delete this item unless you take the required care to avoid possible bad pointer derefrences (i.e. core dumps). Also, be careful hanging on to those references if you are also storing at the same path names: the referenced item will be freed during the store.

That is, if you get a string value (or guid, binary or frame), and then store something else at that path, the string that you've gotten will be freed during the store (internally, by the set_*() routines), and you will be left hanging onto an invalid pointer.

gint64 kvp_frame_get_gint64 (const KvpFrame *frame, const gchar *path)
double kvp_frame_get_double (const KvpFrame *frame, const gchar *path)
gnc_numeric kvp_frame_get_numeric (const KvpFrame *frame, const gchar *path)
const gchar * kvp_frame_get_string (const KvpFrame *frame, const gchar *path)
GUID * kvp_frame_get_guid (const KvpFrame *frame, const gchar *path)
void * kvp_frame_get_binary (const KvpFrame *frame, const gchar *path, guint64 *size_return)
Timespec kvp_frame_get_timespec (const KvpFrame *frame, const gchar *path)
KvpValuekvp_frame_get_value (const KvpFrame *frame, const gchar *path)
KvpFramekvp_frame_get_frame (const KvpFrame *frame, const gchar *path)
KvpFramekvp_frame_get_frame_path (KvpFrame *frame, const gchar *,...)
KvpFramekvp_frame_get_frame_gslist (KvpFrame *frame, const GSList *key_path)
KvpFramekvp_frame_get_frame_slash (KvpFrame *frame, const gchar *path)
KvpFrame KvpValue low-level storing routines.
You probably shouldn't be using these low-level routines

All of the kvp_frame_set_slot_*() routines set the slot values "destructively", in that if there was an old value there, that old value is destroyed (and the memory freed). Thus, one should not hang on to value pointers, as these will get trashed if set_slot is called on the corresponding key.

If you want the old value, use kvp_frame_replace_slot().

KvpValuekvp_frame_replace_slot_nc (KvpFrame *frame, const gchar *slot, KvpValue *new_value)
void kvp_frame_set_slot (KvpFrame *frame, const gchar *key, const KvpValue *value)
void kvp_frame_set_slot_nc (KvpFrame *frame, const gchar *key, KvpValue *value)
void kvp_frame_set_slot_path (KvpFrame *frame, const KvpValue *value, const gchar *first_key,...)
void kvp_frame_set_slot_path_gslist (KvpFrame *frame, const KvpValue *value, GSList *key_path)
KvpFrame KvpValue Low-Level Retrieval Routines
You probably shouldn't be using these low-level routines

Returns the KvpValue in the given KvpFrame 'frame' that is associated with 'key'. If there is no key in the frame, NULL is returned. If the value associated with the key is NULL, NULL is returned.

Pointers passed as arguments into get_slot are the responsibility of the caller. Pointers returned by get_slot are owned by the kvp_frame. Make copies as needed.

KvpValuekvp_frame_get_slot (const KvpFrame *frame, const gchar *key)
KvpValuekvp_frame_get_slot_path (KvpFrame *frame, const gchar *first_key,...)
KvpValuekvp_frame_get_slot_path_gslist (KvpFrame *frame, const GSList *key_path)
gint kvp_frame_compare (const KvpFrame *fa, const KvpFrame *fb)
gint double_compare (double v1, double v2)
KvpValue List Convenience Functions
You probably shouldn't be using these low-level routines

kvp_glist_compare() compares GLists of kvp_values (not to be confused with GLists of something else): it iterates over the list elements, performing a kvp_value_compare on each.

gint kvp_glist_compare (const GList *list1, const GList *list2)
GList * kvp_glist_copy (const GList *list)
void kvp_glist_delete (GList *list)
KvpValue Value access
You probably shouldn't be using these low-level routines

KvpValueType kvp_value_get_type (const KvpValue *value)
gint64 kvp_value_get_gint64 (const KvpValue *value)
double kvp_value_get_double (const KvpValue *value)
gnc_numeric kvp_value_get_numeric (const KvpValue *value)
char * kvp_value_get_string (const KvpValue *value)
GUID * kvp_value_get_guid (const KvpValue *value)
void * kvp_value_get_binary (const KvpValue *value, guint64 *size_return)
GList * kvp_value_get_glist (const KvpValue *value)
KvpFramekvp_value_get_frame (const KvpValue *value)
Timespec kvp_value_get_timespec (const KvpValue *value)
GDate kvp_value_get_gdate (const KvpValue *value)
gint kvp_value_compare (const KvpValue *va, const KvpValue *vb)
Iterators
void kvp_frame_for_each_slot (KvpFrame *f, void(*proc)(const gchar *key, KvpValue *value, gpointer data), gpointer data)


Detailed Description

A key-value frame system.

Author:
Copyright (C) 2000 Bill Gribble

Copyright (C) 2003 Linas Vepstas <linas@linas.org>

Definition in file kvp_frame.h.


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