1 /* $Id: api.h,v 1.31 2005-12-09 11:33:32 adam Exp $
2 Copyright (C) 1995-2005
5 This file is part of the Zebra server.
7 Zebra is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 Zebra is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with Zebra; see the file LICENSE.zebra. If not, write to the
19 Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
27 Most functions return ZEBRA_RES, where ZEBRA_FAIL indicates
28 failure; ZEBRA_OK indicates success.
36 #include <yaz/proto.h>
37 #include <idzebra/res.h>
38 #include <idzebra/version.h>
49 } ZebraTransactionStatus;
51 /** Retrieval Record Descriptor */
53 int errCode; /* non-zero if error when fetching this */
54 char *errString; /* error string */
55 int position; /* position of record in result set (1,2,..) */
56 char *buf; /* record buffer (void pointer really) */
58 oid_value format; /* record syntax */
62 } ZebraRetrievalRecord;
64 /** Scan Term Descriptor */
66 int occurrences; /* scan term occurrences */
67 char *term; /* scan term string */
71 \brief a Zebra Handle - (session)
73 typedef struct zebra_session *ZebraHandle;
76 \brief a Zebra Service handle
78 typedef struct zebra_service *ZebraService;
80 /** \fn ZebraService zebra_start(const char *configName)
81 \brief starts a Zebra service.
82 \param configName name of configuration file
84 This function is a simplified version of zebra_start_res.
87 ZebraService zebra_start(const char *configName);
89 /** \fn ZebraService zebra_start_res(const char *configName, \
90 Res def_res, Res over_res)
91 \brief starts a Zebra service with resources.
92 \param configName name of configuration file
93 \param def_res default resources
94 \param over_res overriding resources
96 This function typically called once in a program. A Zebra Service
97 acts as a factory for Zebra session handles.
100 ZebraService zebra_start_res(const char *configName,
101 Res def_res, Res over_res);
104 \brief stops a Zebra service.
105 \param zs service handle
107 Frees resources used by the service.
110 ZEBRA_RES zebra_stop(ZebraService zs);
113 \brief Lists enabled Zebra filters
114 \param zs service handle
115 \param cd callback parameter (opaque)
116 \param cb callback function
119 void zebra_filter_info(ZebraService zs, void *cd,
120 void (*cb)(void *cd, const char *name));
124 \brief Creates a Zebra session handle within service.
125 \param zs service handle.
127 There should be one handle for each thread doing something
128 with zebra, be that searching or indexing. In simple apps
129 one handle is sufficient
132 ZebraHandle zebra_open(ZebraService zs, Res res);
135 \brief Destroys Zebra session handle.
136 \param zh zebra session handle.
139 ZEBRA_RES zebra_close(ZebraHandle zh);
142 \brief Returns error code for last error
143 \param zh zebra session handle.
146 int zebra_errCode(ZebraHandle zh);
149 \brief Returns error string for last error
150 \param zh zebra session handle.
153 const char *zebra_errString(ZebraHandle zh);
156 \brief Returns additional info for last error
157 \param zh zebra session handle.
160 char *zebra_errAdd(ZebraHandle zh);
163 \brief Returns error code and additional info for last error
164 \param zh zebra session handle.
165 \param code pointer to returned error code
166 \param addinfo pointer to returned additional info
169 void zebra_result(ZebraHandle zh, int *code, char **addinfo);
172 \brief Set limit before Zebra does approx hit count
173 \param zh session handle
174 \param approx_limit the limit
176 Results will be approximiate if hit count is greater than the
177 limit specified. By default there is a high-limit (no limit).
179 ZEBRA_RES zebra_set_approx_limit(ZebraHandle zh, zint approx_limit);
182 \brief Search using PQF Query
183 \param zh session handle
184 \param pqf_query query
185 \param setname name of resultset
186 \param hits of hits is returned
189 ZEBRA_RES zebra_search_PQF(ZebraHandle zh, const char *pqf_query,
190 const char *setname, zint *hits);
192 /** \fn ZEBRA_RES zebra_search_RPN(ZebraHandle zh, ODR o, Z_RPNQuery *query, \
193 const char *setname, zint *hits)
194 \brief Search using RPN Query
195 \param zh session handle
197 \param query RPN query using YAZ structure
198 \param setname name of resultset
199 \param hits number of hits is returned
202 ZEBRA_RES zebra_search_RPN(ZebraHandle zh, ODR o, Z_RPNQuery *query,
203 const char *setname, zint *hits);
206 \fn ZEBRA_RES zebra_records_retrieve(ZebraHandle zh, ODR stream, \
207 const char *setname, Z_RecordComposition *comp, \
208 oid_value input_format, int num_recs, \
209 ZebraRetrievalRecord *recs)
210 \brief Retrieve records from result set (after search)
211 \param zh session handle
212 \param stream allocate records returned using this ODR
213 \param setname name of result set to retrieve records from
214 \param comp Z39.50 record composition
215 \param input_format transfer syntax (OID)
216 \param num_recs number of records to retrieve
217 \param recs store records in this structure (size is num_recs)
220 ZEBRA_RES zebra_records_retrieve(ZebraHandle zh, ODR stream,
222 Z_RecordComposition *comp,
223 oid_value input_format,
225 ZebraRetrievalRecord *recs);
227 \brief Deletes one or more resultsets
228 \param zh session handle
229 \param function Z_DeleteResultSetRequest_{list,all}
230 \param num_setnames number of result sets
231 \param setnames result set names
232 \param statuses status result
235 int zebra_deleteResultSet(ZebraHandle zh, int function,
236 int num_setnames, char **setnames,
241 \brief returns number of term info terms assocaited with result set
242 \param zh session handle
243 \param setname result set name
244 \param num_terms number of terms returned in this integer
246 This function is used in conjunction with zebra_result_set_term_info.
247 If operation was successful, ZEBRA_OK is returned; otherwise
248 ZEBRA_FAIL is returned (typically non-existing setname)
251 ZEBRA_RES zebra_result_set_term_no(ZebraHandle zh, const char *setname,
255 \brief returns information about a term assocated with a result set
256 \param zh session handle
257 \param setname result set name
258 \param no the term we want to know about (0=first, 1=second,..)
259 \param count the number of occurrences of this term, aka hits (output)
260 \param approx about hits: 0=exact,1=approx (output)
261 \param termbuf buffer for term string (intput, output)
262 \param termlen size of termbuf (input=max, output=actual length)
263 \param term_ref_id if non-NULL *term_ref_id holds term reference
265 Returns information about one search term associated with result set.
266 Use zebra_result_set_term_no to read total number of terms associated
267 with result set. If this function can not return information,
268 due to no out of range or bad result set name, ZEBRA_FAIL is
270 The passed termbuf must be able to hold at least *termlen characters.
271 Upon completion, *termlen holds actual length of search term.
274 ZEBRA_RES zebra_result_set_term_info(ZebraHandle zh, const char *setname,
275 int no, zint *count, int *approx,
276 char *termbuf, size_t *termlen,
277 const char **term_ref_id);
281 \brief performs Scan (Z39.50 style)
282 \param zh session handle
283 \param stream ODR handle for result
284 \param zapt Attribute plus Term (start term)
285 \param attributeset Attributeset for Attribute plus Term
286 \param position input/output position
287 \param num_entries number of terms requested / returned
288 \param entries list of resulting terms (ODR allocated)
289 \param is_partial upon return 1=partial, 0=complete
290 \param setname limit scan by this set (NULL means no limit)
292 YAZ_EXPORT ZEBRA_RES zebra_scan(ZebraHandle zh, ODR stream,
293 Z_AttributesPlusTerm *zapt,
294 oid_value attributeset,
295 int *position, int *num_entries,
296 ZebraScanEntry **entries,
298 const char *setname);
301 \brief performs Scan (taking PQF string)
302 \param zh session handle
303 \param stream ODR handle for result
304 \param query PQF scan query
305 \param position input/output position
306 \param num_entries number of terms requested / returned
307 \param entries list of resulting terms (ODR allocated)
308 \param is_partial upon return 1=partial, 0=complete
309 \param setname limit scan by this set (NULL means no limit)
312 ZEBRA_RES zebra_scan_PQF(ZebraHandle zh, ODR stream, const char *query,
313 int *position, int *num_entries, ZebraScanEntry **entries,
314 int *is_partial, const char *setname);
317 \brief authenticate user. Returns 0 if OK, != 0 on failure
318 \param zh session handle
319 \param user user name
323 ZEBRA_RES zebra_auth(ZebraHandle zh, const char *user, const char *pass);
326 \brief Normalize zebra term for register (subject to change!)
327 \param zh session handle
328 \param reg_id register ID, 'w', 'p',..
329 \param input_str input string buffer
330 \param input_len input string length
331 \param output_str output string buffer
332 \param output_len output string length
335 int zebra_string_norm(ZebraHandle zh, unsigned reg_id, const char *input_str,
336 int input_len, char *output_str, int output_len);
339 \brief Creates a database
340 \param zh session handle
341 \param db database to be created
344 ZEBRA_RES zebra_create_database(ZebraHandle zh, const char *db);
347 \brief Deletes a database (drop)
348 \param zh session handle
349 \param db database to be deleted
352 ZEBRA_RES zebra_drop_database(ZebraHandle zh, const char *db);
355 ZEBRA_RES zebra_admin_shutdown(ZebraHandle zh);
358 ZEBRA_RES zebra_admin_start(ZebraHandle zh);
361 ZEBRA_RES zebra_shutdown(ZebraService zs);
364 ZEBRA_RES zebra_admin_import_begin(ZebraHandle zh, const char *database,
365 const char *record_type);
368 ZEBRA_RES zebra_admin_import_segment(ZebraHandle zh,
372 ZEBRA_RES zebra_admin_import_end(ZebraHandle zh);
375 ZEBRA_RES zebra_admin_exchange_record(ZebraHandle zh,
378 const char *recid_buf, size_t recid_len,
382 ZEBRA_RES zebra_begin_trans(ZebraHandle zh, int rw);
385 ZEBRA_RES zebra_end_trans(ZebraHandle zh);
388 ZEBRA_RES zebra_end_transaction(ZebraHandle zh,
389 ZebraTransactionStatus *stat);
392 ZEBRA_RES zebra_commit(ZebraHandle zh);
395 ZEBRA_RES zebra_clean(ZebraHandle zh);
398 ZEBRA_RES zebra_init(ZebraHandle zh);
401 ZEBRA_RES zebra_compact(ZebraHandle zh);
403 YAZ_EXPORT int zebra_repository_update(ZebraHandle zh, const char *path);
404 YAZ_EXPORT int zebra_repository_delete(ZebraHandle zh, const char *path);
405 YAZ_EXPORT int zebra_repository_show(ZebraHandle zh, const char *path);
407 YAZ_EXPORT int zebra_add_record(ZebraHandle zh, const char *buf, int buf_size);
410 ZEBRA_RES zebra_insert_record(ZebraHandle zh,
411 const char *recordType,
412 SYSNO *sysno, const char *match,
414 const char *buf, int buf_size,
417 ZEBRA_RES zebra_update_record(ZebraHandle zh,
418 const char *recordType,
419 SYSNO *sysno, const char *match,
421 const char *buf, int buf_size,
424 ZEBRA_RES zebra_delete_record(ZebraHandle zh,
425 const char *recordType,
426 SYSNO *sysno, const char *match, const char *fname,
427 const char *buf, int buf_size,
431 ZEBRA_RES zebra_sort(ZebraHandle zh, ODR stream,
432 int num_input_setnames,
433 const char **input_setnames,
434 const char *output_setname,
435 Z_SortKeySpecList *sort_sequence,
439 ZEBRA_RES zebra_select_databases(ZebraHandle zh, int num_bases,
440 const char **basenames);
443 ZEBRA_RES zebra_select_database(ZebraHandle zh, const char *basename);
446 void zebra_shadow_enable(ZebraHandle zh, int value);
449 int zebra_register_statistics(ZebraHandle zh, int dumpdict);
452 ZEBRA_RES zebra_record_encoding(ZebraHandle zh, const char *encoding);
455 ZEBRA_RES zebra_octet_term_encoding(ZebraHandle zh, const char *encoding);
459 void zebra_set_resource(ZebraHandle zh, const char *name, const char *value);
461 const char *zebra_get_resource(ZebraHandle zh,
462 const char *name, const char *defaultvalue);
466 void zebra_pidfname(ZebraService zs, char *path);
476 ZebraMetaRecord *zebra_meta_records_create(ZebraHandle zh,
478 int num, zint *positions);
482 ZebraMetaRecord *zebra_meta_records_create_range(ZebraHandle zh,
484 zint start, int num);
487 void zebra_meta_records_destroy(ZebraHandle zh, ZebraMetaRecord *records,
491 struct BFiles_struct *zebra_get_bfs(ZebraHandle zh);
494 ZEBRA_RES zebra_set_limit(ZebraHandle zh, int complement_flag, zint *ids);
500 * \section intro_sec Introduction
502 * Zebra is a search engine for structure data, such as XML, MARC
505 * API users should read the api.h for all the public definitions.
507 * The remaining sections briefly describe each of
508 * Zebra major modules/components.
510 * \section util Base Utilities
512 * The Zebra utilities (util.h) defines fundamental types and a few
513 * utilites for Zebra.
515 * \section res Resources
517 * The resources system (res.h) is a manager of configuration
518 * resources. The resources can be viewed as a simple database.
519 * Resources can be read from a configurtion file, they can be
520 * read or written by an application. Resources can also be written,
521 * but that facility is not currently in use.
523 * \section bfile Bfiles
525 * The Bfiles (bfile.h) provides a portable interface to the
526 * local file system. It also provides a facility for safe updates
527 * (shadow updates). All file system access is handle by this module
528 * (except for trival reads of configuration files).
530 * \section dict Dictionary
532 * The Zebra dictionary (dict.h) maps a search term (key) to a value. The
533 * value is a reference to the list of records identifers in which
534 * the term occurs. Zebra uses an ISAM data structure for the list
535 * of term occurrences. The Dictionary uses \ref bfile.
539 * Zebra maintains an ISAM for each term where each ISAM is a list
540 * of record identifiers corresponding to the records in which the
541 * term occur. Unlike traditional ISAM systems, the Zebra ISAM
542 * is compressed. The ISAM system uses \ref bfile.
544 * Zebra has more than one ISAM system. The old and stable ISAM system
545 * is named isamc (see isamc.h). Another version isams is a write-once
546 * isam system that is quite compact - suitable for CD-ROMs (isams.h).
547 * The newest ISAM system, isamb, is implemented as a B-Tree (see isamb.h).
549 * \section data1 Data-1
551 * The data1 (data1.h) module deals with structured documents. The module can
552 * can read, modify and write documents. The document structure was
553 * originally based on GRS-1 - a Z39.50 v3 structure that predates
554 * DOM. These days the data1 structure may describe XML/SGML as well.
555 * The data1, like DOM, is a tree structure. Each node in the tree
556 * can be of type element, text (cdata), preprocessing instruction,
557 * comment. Element nodes can point to attribute nodes.
559 * \section recctrl Record Control
561 * The record control module (recctrl.h) is responsible for
562 * managing the various record types ("classes" or filters).
564 * \section rset Result-Set
566 * The Result-Set module (rset.h) defines an interface that all
567 * Zebra Search Results must implement. Each operation (AND, OR, ..)
568 * correspond to an implementation of that interface.
572 * DFA (dfa.h) Deterministic Finite Automa is a regular expression engine.
573 * The module compiles a regular expression to a DFA. The DFA can then
574 * be used in various application to perform fast match against the
575 * origianl expression. The \ref Dict uses DFA to perform lookup
576 * using regular expressions.