Sequence

Sequence — Ordered sequence of items.

Synopsis

typedef             raptor_sequence;
raptor_sequence*    raptor_new_sequence                 (raptor_sequence_free_handler *free_handler,
                                                         raptor_sequence_print_handler *print_handler);
void                raptor_free_sequence                (raptor_sequence *seq);
void*               raptor_sequence_delete_at           (raptor_sequence *seq,
                                                         int idx);
int                 raptor_sequence_size                (raptor_sequence *seq);
int                 raptor_sequence_set_at              (raptor_sequence *seq,
                                                         int idx,
                                                         void *data);
int                 raptor_sequence_push                (raptor_sequence *seq,
                                                         void *data);
int                 raptor_sequence_shift               (raptor_sequence *seq,
                                                         void *data);
void*               raptor_sequence_get_at              (raptor_sequence *seq,
                                                         int idx);
void*               raptor_sequence_pop                 (raptor_sequence *seq);
void*               raptor_sequence_unshift             (raptor_sequence *seq);
int                 raptor_compare_strings              (const void *a,
                                                         const void *b);
void                raptor_sequence_sort                (raptor_sequence *seq,
                                                         int (compareconst void *, const void *) ());
void                raptor_sequence_print_string        (char *data,
                                                         FILE *fh);
void                raptor_sequence_print_uri           (char *data,
                                                         FILE *fh);
void                raptor_sequence_set_print_handler   (raptor_sequence *seq,
                                                         raptor_sequence_print_handler *print_handler);
void                raptor_sequence_print               (raptor_sequence *seq,
                                                         FILE *fh);
int                 raptor_sequence_join                (raptor_sequence *dest,
                                                         raptor_sequence *src);

Description

A utility class that provides access to small sequence of items that grow at the end and require quick ordered and indexed access. Can be used as a queue/FIFO but less efficiently than a stack where the items are added and removed from the end.

Details

raptor_sequence

raptor_sequence* raptor_sequence;

Raptor sequence class

raptor_new_sequence ()

raptor_sequence*    raptor_new_sequence                 (raptor_sequence_free_handler *free_handler,
                                                         raptor_sequence_print_handler *print_handler);

Constructor - create a new sequence with the given handlers.

free_handler :

 handler to free a sequence item

print_handler :

 handler to print a sequence item to a FILE*

Returns :

 a new raptor_sequence or NULL on failure

raptor_free_sequence ()

void                raptor_free_sequence                (raptor_sequence *seq);

Destructor - free a raptor_sequence

seq :

 sequence to destroy

raptor_sequence_delete_at ()

void*               raptor_sequence_delete_at           (raptor_sequence *seq,
                                                         int idx);

Remove an item from a position a sequence, returning it

The item at the offset idx in the sequence is replaced with a NULL pointer and any existing item is returned. The caller owns the resulting item.

seq :

 sequence object

idx :

 index into sequence to operate at

Returns :

 NULL on failure

raptor_sequence_size ()

int                 raptor_sequence_size                (raptor_sequence *seq);

Get the number of items in a sequence.

seq :

 sequence object

Returns :

 the sequence size (>=0)

raptor_sequence_set_at ()

int                 raptor_sequence_set_at              (raptor_sequence *seq,
                                                         int idx,
                                                         void *data);

Replace/set an item in a sequence.

The item at the offset idx in the sequence is replaced with the new item data (which may be NULL). Any existing item is freed with the sequence's free_handler. If necessary the sequence is extended (with NULLs) to handle a larger offset.

The sequence takes ownership of the new data item. On failure, the item is freed immediately.

seq :

 sequence object

idx :

 index into sequence to operate at

data :

 new data item.

Returns :

 non-0 on failure

raptor_sequence_push ()

int                 raptor_sequence_push                (raptor_sequence *seq,
                                                         void *data);

Add an item to the end of the sequence.

The sequence takes ownership of the pushed item and frees it with the free_handler. On failure, the item is freed immediately.

seq :

 sequence to add to

data :

 item to add

Returns :

 non-0 on failure

raptor_sequence_shift ()

int                 raptor_sequence_shift               (raptor_sequence *seq,
                                                         void *data);

Add an item to the start of the sequence.

The sequence takes ownership of the shifted item and frees it with the free_handler. On failure, the item is freed immediately.

seq :

 sequence to add to

data :

 item to add

Returns :

 non-0 on failure

raptor_sequence_get_at ()

void*               raptor_sequence_get_at              (raptor_sequence *seq,
                                                         int idx);

Retrieve an item at offset index in the sequence.

This is efficient to perform. raptor_sequence is optimised to append/remove from the end of the sequence.

After this call the item is still owned by the sequence.

seq :

 sequence to use

idx :

 index of item to get

Returns :

 the object or NULL if index is out of range (0... sequence size-1)

raptor_sequence_pop ()

void*               raptor_sequence_pop                 (raptor_sequence *seq);

Retrieve the item at the end of the sequence.

Ownership of the item is transferred to the caller, i.e. caller is responsible of freeing the item.

seq :

 sequence to use

Returns :

 the object or NULL if the sequence is empty

raptor_sequence_unshift ()

void*               raptor_sequence_unshift             (raptor_sequence *seq);

Retrieve the item at the start of the sequence.

Ownership of the item is transferred to the caller, i.e. caller is responsible of freeing the item.

seq :

 sequence to use

Returns :

 the object or NULL if the sequence is empty

raptor_compare_strings ()

int                 raptor_compare_strings              (const void *a,
                                                         const void *b);

Utility function for raptor_sequence_sort() to compare a sequence of strings.

a :

 pointer first string

b :

 pointer to second string

Returns :

 comparison of a to b as strings

raptor_sequence_sort ()

void                raptor_sequence_sort                (raptor_sequence *seq,
                                                         int (compareconst void *, const void *) ());

The comparison function is compatible with that used for qsort() and provides the addresses of pointers to the data that must be dereferenced to get to the stored sequence data.

seq :

 sequence to sort

compare :

 comparison function

raptor_sequence_print_string ()

void                raptor_sequence_print_string        (char *data,
                                                         FILE *fh);

Helper function for printing a sequence of strings.

Intended for use as a raptor_sequence_print_handler passed into raptor_new_sequence().

data :

 data item (a char*)

fh :

 file handle to print to

raptor_sequence_print_uri ()

void                raptor_sequence_print_uri           (char *data,
                                                         FILE *fh);

Helper function for printing a sequence of URIs.

Intended for use as a raptor_sequence_print_handler passed into raptor_new_sequence().

raptor_init() MUST have been called before calling this function.

deprecated: Use raptor_uri_print() instead.

data :

 data item (a raptor_uri)

fh :

 file handle to print to

raptor_sequence_set_print_handler ()

void                raptor_sequence_set_print_handler   (raptor_sequence *seq,
                                                         raptor_sequence_print_handler *print_handler);

Set the print handler for the sequence.

This is set in the raptor_new_sequence() constructor and can be overridden here.

seq :

 sequence

print_handler :

 print handler

raptor_sequence_print ()

void                raptor_sequence_print               (raptor_sequence *seq,
                                                         FILE *fh);

Print the sequence contents using the print_handler to print the data items.

seq :

 sequence to sort

fh :

 file handle

raptor_sequence_join ()

int                 raptor_sequence_join                (raptor_sequence *dest,
                                                         raptor_sequence *src);

Join two sequences moving all items from one sequence to the end of another.

After this operation, sequence src will be empty (zero size) but will have the same item capacity as before.

dest :

 raptor_sequence destination sequence

src :

 raptor_sequence source sequence

Returns :

 non-0 on failure
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