119 lines
4.2 KiB
C++
119 lines
4.2 KiB
C++
/* Copyright (C) 2007 J.F.Dockes
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef _rcldb_p_h_included_
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#define _rcldb_p_h_included_
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#include "xapian.h"
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namespace Rcl {
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// Omega compatible values. We leave a hole for future omega values. Not sure
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// it makes any sense to keep any level of omega compat given that the index
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// is incompatible anyway.
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enum value_slot {
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VALUE_LASTMOD = 0, // 4 byte big endian value - seconds since 1970.
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VALUE_MD5 = 1, // 16 byte MD5 checksum of original document.
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VALUE_SIG = 10 // Doc sig as chosen by app (ex: mtime+size
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};
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// Generic Xapian exception catching code. We do this quite often,
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// and I have no idea how to do this except for a macro
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#define XCATCHERROR(MSG) \
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catch (const Xapian::Error &e) { \
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MSG = e.get_msg(); \
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if (MSG.empty()) MSG = "Empty error message"; \
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} catch (const string &s) { \
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MSG = s; \
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if (MSG.empty()) MSG = "Empty error message"; \
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} catch (const char *s) { \
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MSG = s; \
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if (MSG.empty()) MSG = "Empty error message"; \
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} catch (...) { \
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MSG = "Caught unknown xapian exception"; \
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}
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#define XAPTRY(STMTTOTRY, XAPDB, ERSTR) \
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for (int tries = 0; tries < 2; tries++) { \
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try { \
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STMTTOTRY; \
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ERSTR.erase(); \
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break; \
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} catch (const Xapian::DatabaseModifiedError &e) { \
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ERSTR = e.get_msg(); \
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XAPDB.reopen(); \
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continue; \
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} XCATCHERROR(ERSTR); \
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break; \
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}
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class Query;
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// A class for data and methods that would have to expose
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// Xapian-specific stuff if they were in Rcl::Db. There could actually be
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// 2 different ones for indexing or query as there is not much in
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// common.
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class Db::Native {
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public:
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Db *m_rcldb; // Parent
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bool m_isopen;
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bool m_iswritable;
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bool m_noversionwrite; //Set if open failed because of version mismatch!
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// Indexing
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Xapian::WritableDatabase xwdb;
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// Querying (active even if the wdb is too)
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Xapian::Database xrdb;
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// We sometimes go through the wdb for some query ops, don't
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// really know if this makes sense
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Xapian::Database& xdb() {return m_iswritable ? xwdb : xrdb;}
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Native(Db *db)
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: m_rcldb(db), m_isopen(false), m_iswritable(false),
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m_noversionwrite(false)
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{ }
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~Native() {
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}
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vector<string> makeAbstract(Xapian::docid id, Query *query);
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bool dbDataToRclDoc(Xapian::docid docid, std::string &data, Doc &doc);
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/** Compute list of subdocuments for a given udi. We look for documents
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* indexed by a parent term matching the udi, the posting list for the
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* parentterm(udi) (As suggested by James Aylett)
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*
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* Note that this is not currently recursive: all subdocs are supposed
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* to be children of the file doc.
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* Ie: in a mail folder, all messages, attachments, attachments of
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* attached messages etc. must have the folder file document as
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* parent.
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* Parent-child relationships are defined by the indexer (rcldb user)
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*
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* The file-system indexer currently works this way (flatly),
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* subDocs() could be relatively easily changed to support full recursivity
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* if needed.
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*/
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bool subDocs(const string &udi, vector<Xapian::docid>& docids);
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};
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}
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#endif /* _rcldb_p_h_included_ */
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