File: rdf_hash_cursor.c

package info (click to toggle)
redland 1.0.7-1
  • links: PTS, VCS
  • area: main
  • in suites: lenny
  • size: 27,592 kB
  • ctags: 12,328
  • sloc: ansic: 79,017; xml: 25,115; sh: 10,162; yacc: 5,985; lex: 3,682; makefile: 3,260; perl: 2,814; cpp: 59
file content (144 lines) | stat: -rw-r--r-- 3,818 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
/* -*- Mode: c; c-basic-offset: 2 -*-
 *
 * rdf_hash.c - RDF Hash Cursor Implementation
 *
 * $Id: rdf_hash_cursor.c 8534 2006-01-26 04:57:33Z cmdjb $
 *
 * Copyright (C) 2000-2006, David Beckett http://purl.org/net/dajobe/
 * Copyright (C) 2000-2004, University of Bristol, UK http://www.bristol.ac.uk/
 * 
 * This package is Free Software and part of Redland http://librdf.org/
 * 
 * It is licensed under the following three licenses as alternatives:
 *   1. GNU Lesser General Public License (LGPL) V2.1 or any newer version
 *   2. GNU General Public License (GPL) V2 or any newer version
 *   3. Apache License, V2.0 or any newer version
 * 
 * You may not use this file except in compliance with at least one of
 * the above three licenses.
 * 
 * See LICENSE.html or LICENSE.txt at the top of this package for the
 * complete terms and further detail along with the license texts for
 * the licenses in COPYING.LIB, COPYING and LICENSE-2.0.txt respectively.
 * 
 * 
 */


#ifdef HAVE_CONFIG_H
#include <rdf_config.h>
#endif

#ifdef WIN32
#include <win32_rdf_config.h>
#endif

#include <stdio.h>
#include <stdarg.h>
#include <ctype.h>
#include <sys/types.h>

#include <redland.h>


/* private structure */
struct librdf_hash_cursor_s {
  librdf_hash *hash;
  void *context;
};



/**
 * librdf_new_hash_cursor:
 * @hash: the hash object
 *
 * Constructor - Create a new #librdf_hash_cursor over a #librdf_hash.
 *
 * Return value: a new #librdf_hash_cursor or NULL on failure
 **/
librdf_hash_cursor*
librdf_new_hash_cursor (librdf_hash* hash) 
{
  librdf_hash_cursor* cursor;
  void *cursor_context;

  cursor=(librdf_hash_cursor*)LIBRDF_CALLOC(librdf_hash_cursor, 1, 
                                            sizeof(librdf_hash_cursor));
  if(!cursor)
    return NULL;

  cursor_context=(char*)LIBRDF_CALLOC(librdf_hash_cursor_context, 1,
                                      hash->factory->cursor_context_length);
  if(!cursor_context) {
    LIBRDF_FREE(librdf_hash_cursor, cursor);
    return NULL;
  }

  cursor->hash=hash;
  cursor->context=cursor_context;

  if(hash->factory->cursor_init(cursor->context, hash->context)) {
    librdf_free_hash_cursor(cursor);
    cursor=NULL;
  }

  return cursor;
}


/**
 * librdf_free_hash_cursor:
 *
 * Destructor - destroy a #librdf_hash_cursor object.
 *
 * @cursor: hash cursor object
 **/
void
librdf_free_hash_cursor (librdf_hash_cursor* cursor) 
{
  if(cursor->context) {
    cursor->hash->factory->cursor_finish(cursor->context);
    LIBRDF_FREE(librdf_hash_cursor_context, cursor->context);
  }

  LIBRDF_FREE(librdf_hash_cursor, cursor);
}


int
librdf_hash_cursor_set(librdf_hash_cursor *cursor,
                       librdf_hash_datum *key,
                       librdf_hash_datum *value)
{
  return cursor->hash->factory->cursor_get(cursor->context, key, value, 
                                           LIBRDF_HASH_CURSOR_SET);
}


int
librdf_hash_cursor_get_next_value(librdf_hash_cursor *cursor, 
                                  librdf_hash_datum *key,
                                  librdf_hash_datum *value)
{
  return cursor->hash->factory->cursor_get(cursor->context, key, value, 
                                           LIBRDF_HASH_CURSOR_NEXT_VALUE);
}


int
librdf_hash_cursor_get_first(librdf_hash_cursor *cursor,
                             librdf_hash_datum *key, librdf_hash_datum *value)
{
  return cursor->hash->factory->cursor_get(cursor->context, key, value, 
                                           LIBRDF_HASH_CURSOR_FIRST);
}


int
librdf_hash_cursor_get_next(librdf_hash_cursor *cursor, librdf_hash_datum *key,
                            librdf_hash_datum *value)
{
  return cursor->hash->factory->cursor_get(cursor->context, key, value, 
                                           LIBRDF_HASH_CURSOR_NEXT);
}