#ifndef lint
static char rcsid[] = "@(#$Id: rcldb.cpp,v 1.154 2008-12-17 16:19:58 dockes Exp $ (C) 2004 J.F.Dockes";
#endif
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdio.h>
#include <cstring>
#include <unistd.h>
#include <fnmatch.h>
#include <regex.h>
#include <math.h>
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#ifndef NO_NAMESPACES
using namespace std;
#endif /* NO_NAMESPACES */
#include "xapian/version.h"
#include "rclconfig.h"
#include "rcldb.h"
#include "rcldb_p.h"
#include "stemdb.h"
#include "textsplit.h"
#include "transcode.h"
#include "unacpp.h"
#include "conftree.h"
#include "debuglog.h"
#include "pathut.h"
#include "smallut.h"
#include "utf8iter.h"
#include "searchdata.h"
#include "rclquery.h"
#include "rclquery_p.h"
#include "md5.h"
#include "rclversion.h"
#ifndef MAX
#define MAX(A,B) (A>B?A:B)
#endif
#ifndef MIN
#define MIN(A,B) (A<B?A:B)
#endif
// Recoll index format version is stored in user metadata. When this change,
// we can't open the db and will have to reindex.
static const string RCL_IDX_VERSION_KEY("RCL_IDX_VERSION_KEY");
static const string RCL_IDX_VERSION("1");
// This is the word position offset at which we index the body text
// (abstract, keywords, etc.. are stored before this)
static const unsigned int baseTextPosition = 100000;
#ifndef NO_NAMESPACES
namespace Rcl {
#endif
string version_string(){
return string("Recoll ") + string(rclversionstr) + string(" + Xapian ") +
string(Xapian::version_string());
}
// Synthetic abstract marker (to discriminate from abstract actually
// found in document)
const static string rclSyntAbs("?!#@");
// Compute the unique term used to link documents to their origin.
// "Q" + external udi
static inline string make_uniterm(const string& udi)
{
string uniterm("Q");
uniterm.append(udi);
return uniterm;
}
// Compute parent term used to link documents to their parent document (if any)
// "F" + parent external udi
static inline string make_parentterm(const string& udi)
{
// I prefer to be in possible conflict with omega than with
// user-defined fields (Xxxx) that we also allow. "F" is currently
// not used by omega (2008-07)
string pterm("F");
pterm.append(udi);
return pterm;
}
/* See comment in class declaration: return all subdocuments of a
* document given by its unique id.
*/
bool Db::Native::subDocs(const string &udi, vector<Xapian::docid>& docids)
{
LOGDEB2(("subDocs: [%s]\n", uniterm.c_str()));
string pterm = make_parentterm(udi);
XAPTRY(docids.clear();
docids.insert(docids.begin(), xrdb.postlist_begin(pterm),
xrdb.postlist_end(pterm)),
xrdb, m_rcldb->m_reason);
if (!m_rcldb->m_reason.empty()) {
LOGERR(("Rcl::Db::subDocs: %s\n", m_rcldb->m_reason.c_str()));
return false;
} else {
LOGDEB(("Db::Native::subDocs: returning %d ids\n", docids.size()));
return true;
}
}
// Only ONE field name inside the index data record differs from the
// Rcl::Doc ones: caption<->title, for a remnant of compatibility with
// omega
static const string keycap("caption");
// Turn data record from db into document fields
bool Db::Native::dbDataToRclDoc(Xapian::docid docid, std::string &data,
Doc &doc, int percent)
{
LOGDEB0(("Db::dbDataToRclDoc: data: %s\n", data.c_str()));
ConfSimple parms(data);
if (!parms.ok())
return false;
parms.get(Doc::keyurl, doc.url);
parms.get(Doc::keytp, doc.mimetype);
parms.get(Doc::keyfmt, doc.fmtime);
parms.get(Doc::keydmt, doc.dmtime);
parms.get(Doc::keyoc, doc.origcharset);
parms.get(keycap, doc.meta[Doc::keytt]);
parms.get(Doc::keykw, doc.meta[Doc::keykw]);
parms.get(Doc::keyabs, doc.meta[Doc::keyabs]);
// Possibly remove synthetic abstract indicator (if it's there, we
// used to index the beginning of the text as abstract).
doc.syntabs = false;
if (doc.meta[Doc::keyabs].find(rclSyntAbs) == 0) {
doc.meta[Doc::keyabs] = doc.meta[Doc::keyabs].substr(rclSyntAbs.length());
doc.syntabs = true;
}
char buf[20];
sprintf(buf,"%.2f", float(percent) / 100.0);
doc.pc = percent;
doc.meta[Doc::keyrr] = buf;
parms.get(Doc::keyipt, doc.ipath);
parms.get(Doc::keyfs, doc.fbytes);
parms.get(Doc::keyds, doc.dbytes);
parms.get(Doc::keysig, doc.sig);
doc.xdocid = docid;
// Other, not predefined meta fields:
list<string> keys = parms.getNames(string());
for (list<string>::const_iterator it = keys.begin();
it != keys.end(); it++) {
if (doc.meta.find(*it) == doc.meta.end())
parms.get(*it, doc.meta[*it]);
}
return true;
}
// Remove prefixes (caps) from a list of terms.
static list<string> noPrefixList(const list<string>& in)
{
list<string> out;
for (list<string>::const_iterator qit = in.begin();
qit != in.end(); qit++) {
if ('A' <= qit->at(0) && qit->at(0) <= 'Z') {
string term = *qit;
while (term.length() && 'A' <= term.at(0) && term.at(0) <= 'Z')
term.erase(0, 1);
if (term.length())
out.push_back(term);
continue;
} else {
out.push_back(*qit);
}
}
return out;
}
//#define DEBUGABSTRACT 1
#ifdef DEBUGABSTRACT
#define LOGABS LOGDEB
#else
#define LOGABS LOGDEB2
#endif
// Build a document abstract by extracting text chunks around the query terms
// This uses the db termlists, not the original document.
//
// DatabaseModified and other general exceptions are catched and
// possibly retried by our caller
string Db::Native::makeAbstract(Xapian::docid docid, Query *query)
{
Chrono chron;
LOGDEB(("makeAbstract:%d: maxlen %d wWidth %d\n", chron.ms(),
m_rcldb->m_synthAbsLen, m_rcldb->m_synthAbsWordCtxLen));
list<string> iterms;
query->getQueryTerms(iterms);
list<string> terms = noPrefixList(iterms);
if (terms.empty()) {
return string();
}
// Retrieve db-wide frequencies for the query terms
if (query->m_nq->termfreqs.empty()) {
double doccnt = xrdb.get_doccount();
if (doccnt == 0) doccnt = 1;
for (list<string>::const_iterator qit = terms.begin();
qit != terms.end(); qit++) {
query->m_nq->termfreqs[*qit] = xrdb.get_termfreq(*qit) / doccnt;
LOGABS(("makeAbstract: [%s] db freq %.1e\n", qit->c_str(),
query->m_nq->termfreqs[*qit]));
}
LOGABS(("makeAbstract:%d: got termfreqs\n", chron.ms()));
}
// Compute a term quality coefficient by retrieving the term
// Within Document Frequencies and multiplying by overal term
// frequency, then using log-based thresholds. We are going to try
// and show text around the less common search terms.
map<string, double> termQcoefs;
double totalweight = 0;
double doclen = xrdb.get_doclength(docid);
if (doclen == 0) doclen = 1;
for (list<string>::const_iterator qit = terms.begin();
qit != terms.end(); qit++) {
Xapian::TermIterator term = xrdb.termlist_begin(docid);
term.skip_to(*qit);
if (term != xrdb.termlist_end(docid) && *term == *qit) {
double q = (term.get_wdf() / doclen) * query->m_nq->termfreqs[*qit];
q = -log10(q);
if (q < 3) {
q = 0.05;
} else if (q < 4) {
q = 0.3;
} else if (q < 5) {
q = 0.7;
} else if (q < 6) {
q = 0.8;
} else {
q = 1;
}
termQcoefs[*qit] = q;
totalweight += q;
}
}
LOGABS(("makeAbstract:%d: computed Qcoefs.\n", chron.ms()));
// Build a sorted by quality term list.
multimap<double, string> byQ;
for (list<string>::const_iterator qit = terms.begin();
qit != terms.end(); qit++) {
if (termQcoefs.find(*qit) != termQcoefs.end())
byQ.insert(pair<double,string>(termQcoefs[*qit], *qit));
}
#ifdef DEBUGABSTRACT
for (multimap<double, string>::reverse_iterator qit = byQ.rbegin();
qit != byQ.rend(); qit++) {
LOGDEB(("%.1e->[%s]\n", qit->first, qit->second.c_str()));
}
#endif
// For each of the query terms, ask xapian for its positions list
// in the document. For each position entry, remember it in
// qtermposs and insert it and its neighbours in the set of
// 'interesting' positions
// The terms 'array' that we partially populate with the document
// terms, at their positions around the search terms positions:
map<unsigned int, string> sparseDoc;
// All the chosen query term positions.
vector<unsigned int> qtermposs;
// Limit the total number of slots we populate. The 7 is taken as
// average word size. It was a mistake to have the user max
// abstract size parameter in characters, we basically only deal
// with words. We used to limit the character size at the end, but
// this damaged our careful selection of terms
const unsigned int maxtotaloccs =
m_rcldb->m_synthAbsLen /(7 * (m_rcldb->m_synthAbsWordCtxLen+1));
LOGABS(("makeAbstract:%d: mxttloccs %d\n", chron.ms(), maxtotaloccs));
// This can't happen, but would crash us
if (totalweight == 0.0) {
LOGERR(("makeAbstract: 0 totalweight!\n"));
return string();
}
// This is used to mark positions overlapped by a multi-word match term
const string occupiedmarker("?");
const string ellipsis("...");
// Let's go populate
for (multimap<double, string>::reverse_iterator qit = byQ.rbegin();
qit != byQ.rend(); qit++) {
string qterm = qit->second;
unsigned int maxoccs;
if (byQ.size() == 1) {
maxoccs = maxtotaloccs;
} else {
// We give more slots to the better terms
float q = qit->first / totalweight;
maxoccs = int(ceil(maxtotaloccs * q));
LOGABS(("makeAbstract: [%s] %d max occs (coef %.2f)\n",
qterm.c_str(), maxoccs, q));
}
// The match term may span several words
int qtrmwrdcnt = TextSplit::countWords(qterm, TextSplit::TXTS_NOSPANS);
Xapian::PositionIterator pos;
// There may be query terms not in this doc. This raises an
// exception when requesting the position list, we catch it.
string emptys;
try {
unsigned int occurrences = 0;
for (pos = xrdb.positionlist_begin(docid, qterm);
pos != xrdb.positionlist_end(docid, qterm); pos++) {
int ipos = *pos;
if (ipos < int(baseTextPosition)) // Not in text body
continue;
LOGABS(("makeAbstract: [%s] at %d occurrences %d maxoccs %d\n",
qterm.c_str(), ipos, occurrences, maxoccs));
// Remember the term position
qtermposs.push_back(ipos);
// Add adjacent slots to the set to populate at next
// step by inserting empty strings. Special provisions
// for adding ellipsis and for positions overlapped by
// the match term.
unsigned int sta = MAX(0, ipos-m_rcldb->m_synthAbsWordCtxLen);
unsigned int sto = ipos + qtrmwrdcnt-1 +
m_rcldb->m_synthAbsWordCtxLen;
for (unsigned int ii = sta; ii <= sto; ii++) {
if (ii == (unsigned int)ipos) {
sparseDoc[ii] = qterm;
} else if (ii > (unsigned int)ipos &&
ii < (unsigned int)ipos + qtrmwrdcnt) {
sparseDoc[ii] = occupiedmarker;
} else if (!sparseDoc[ii].compare(ellipsis)) {
// For an empty slot, the test has a side
// effect of inserting an empty string which
// is what we want
sparseDoc[ii] = emptys;
}
}
// Add ... at the end. This may be replaced later by
// an overlapping extract. Take care not to replace an
// empty string here, we really want an empty slot,
// use find()
if (sparseDoc.find(sto+1) == sparseDoc.end()) {
sparseDoc[sto+1] = ellipsis;
}
// Limit to allocated occurences and total size
if (++occurrences >= maxoccs ||
qtermposs.size() >= maxtotaloccs)
break;
}
} catch (...) {
// Term does not occur. No problem.
}
if (qtermposs.size() >= maxtotaloccs)
break;
}
LOGABS(("makeAbstract:%d:chosen number of positions %d\n",
chron.millis(), qtermposs.size()));
// This can happen if there are term occurences in the keywords
// etc. but not elsewhere ?
if (qtermposs.size() == 0)
return string();
// Walk all document's terms position lists and populate slots
// around the query terms. We arbitrarily truncate the list to
// avoid taking forever. If we do cutoff, the abstract may be
// inconsistant (missing words, potentially altering meaning),
// which is bad...
{
Xapian::TermIterator term;
int cutoff = 500 * 1000;
for (term = xrdb.termlist_begin(docid);
term != xrdb.termlist_end(docid); term++) {
// Ignore prefixed terms
if ('A' <= (*term).at(0) && (*term).at(0) <= 'Z')
continue;
if (cutoff-- < 0) {
LOGDEB(("makeAbstract: max term count cutoff\n"));
break;
}
Xapian::PositionIterator pos;
for (pos = xrdb.positionlist_begin(docid, *term);
pos != xrdb.positionlist_end(docid, *term); pos++) {
if (cutoff-- < 0) {
LOGDEB(("makeAbstract: max term count cutoff\n"));
break;
}
map<unsigned int, string>::iterator vit;
if ((vit=sparseDoc.find(*pos)) != sparseDoc.end()) {
// Don't replace a term: the terms list is in
// alphabetic order, and we may have several terms
// at the same position, we want to keep only the
// first one (ie: dockes and dockes@wanadoo.fr)
if (vit->second.empty()) {
LOGABS(("makeAbstract: populating: [%s] at %d\n",
(*term).c_str(), *pos));
sparseDoc[*pos] = *term;
}
}
}
}
}
#if 0
// Debug only: output the full term[position] vector
bool epty = false;
int ipos = 0;
for (map<unsigned int, string>::iterator it = sparseDoc.begin();
it != sparseDoc.end();
it++, ipos++) {
if (it->empty()) {
if (!epty)
LOGDEB(("makeAbstract:vec[%d]: [%s]\n", ipos, it->c_str()));
epty=true;
} else {
epty = false;
LOGDEB(("makeAbstract:vec[%d]: [%s]\n", ipos, it->c_str()));
}
}
#endif
LOGDEB(("makeAbstract:%d: extracting\n", chron.millis()));
// Finally build the abstract by walking the map (in order of position)
string abstract;
abstract.reserve(sparseDoc.size() * 10);
bool incjk = false;
for (map<unsigned int, string>::const_iterator it = sparseDoc.begin();
it != sparseDoc.end(); it++) {
LOGDEB2(("Abtract:output %u -> [%s]\n", it->first,it->second.c_str()));
if (!occupiedmarker.compare(it->second))
continue;
Utf8Iter uit(it->second);
bool newcjk = false;
if (TextSplit::isCJK(*uit))
newcjk = true;
if (!incjk || (incjk && !newcjk))
abstract += " ";
incjk = newcjk;
abstract += it->second;
}
// This happens for docs with no terms (only filename) indexed? I'll fix
// one day (yeah)
if (!abstract.compare("... "))
abstract.clear();
LOGDEB(("makeAbtract: done in %d mS\n", chron.millis()));
return abstract;
}
/* Rcl::Db methods ///////////////////////////////// */
Db::Db(RclConfig *cfp)
: m_ndb(0), m_config(cfp), m_idxAbsTruncLen(250), m_synthAbsLen(250),
m_synthAbsWordCtxLen(4), m_flushMb(-1),
m_curtxtsz(0), m_flushtxtsz(0), m_occtxtsz(0),
m_maxFsOccupPc(0), m_mode(Db::DbRO)
{
m_ndb = new Native(this);
if (m_config) {
m_config->getConfParam("maxfsoccuppc", &m_maxFsOccupPc);
m_config->getConfParam("idxflushmb", &m_flushMb);
}
}
Db::~Db()
{
LOGDEB2(("Db::~Db\n"));
if (m_ndb == 0)
return;
LOGDEB(("Db::~Db: isopen %d m_iswritable %d\n", m_ndb->m_isopen,
m_ndb->m_iswritable));
i_close(true);
}
list<string> Db::getStemmerNames()
{
list<string> res;
stringToStrings(Xapian::Stem::get_available_languages(), res);
return res;
}
bool Db::open(OpenMode mode)
{
if (m_ndb == 0 || m_config == 0) {
m_reason = "Null configuration or Xapian Db";
return false;
}
LOGDEB(("Db::open: m_isopen %d m_iswritable %d\n", m_ndb->m_isopen,
m_ndb->m_iswritable));
if (m_ndb->m_isopen) {
// We used to return an error here but I see no reason to
if (!close())
return false;
}
if (!m_config->getStopfile().empty())
m_stops.setFile(m_config->getStopfile());
string dir = m_config->getDbDir();
string ermsg;
try {
switch (mode) {
case DbUpd:
case DbTrunc:
{
int action = (mode == DbUpd) ? Xapian::DB_CREATE_OR_OPEN :
Xapian::DB_CREATE_OR_OVERWRITE;
m_ndb->xwdb = Xapian::WritableDatabase(dir, action);
m_ndb->m_iswritable = true;
// We open a readonly object in all cases (possibly in
// addition to the r/w one) because some operations
// are faster when performed through a Database: no
// forced flushes on allterms_begin(), ie, used in
// subDocs()
m_ndb->xrdb = Xapian::Database(dir);
LOGDEB(("Db::open: lastdocid: %d\n",
m_ndb->xwdb.get_lastdocid()));
LOGDEB2(("Db::open: resetting updated\n"));
updated.resize(m_ndb->xwdb.get_lastdocid() + 1);
for (unsigned int i = 0; i < updated.size(); i++)
updated[i] = false;
}
break;
case DbRO:
default:
m_ndb->m_iswritable = false;
m_ndb->xrdb = Xapian::Database(dir);
for (list<string>::iterator it = m_extraDbs.begin();
it != m_extraDbs.end(); it++) {
string aerr;
LOGDEB(("Db::Open: adding query db [%s]\n", it->c_str()));
aerr.erase();
try {
// Make this non-fatal
m_ndb->xrdb.add_database(Xapian::Database(*it));
} XCATCHERROR(aerr);
if (!aerr.empty())
LOGERR(("Db::Open: error while trying to add database "
"from [%s]: %s\n", it->c_str(), aerr.c_str()));
}
break;
}
// Check index format version. Must not try to check a just created or
// truncated db
if (mode != DbTrunc && m_ndb->xdb().get_doccount() > 0) {
string version = m_ndb->xdb().get_metadata(RCL_IDX_VERSION_KEY);
if (version.compare(RCL_IDX_VERSION)) {
m_ndb->m_noversionwrite = true;
LOGERR(("Rcl::Db::open: file index [%s], software [%s]\n",
version.c_str(), RCL_IDX_VERSION.c_str()));
throw Xapian::DatabaseError("Recoll index version mismatch",
"", "");
}
}
m_mode = mode;
m_ndb->m_isopen = true;
m_basedir = dir;
return true;
} XCATCHERROR(ermsg);
LOGERR(("Db::open: exception while opening [%s]: %s\n",
dir.c_str(), ermsg.c_str()));
return false;
}
// Note: xapian has no close call, we delete and recreate the db
bool Db::close()
{
LOGDEB2(("Db::close()\n"));
return i_close(false);
}
bool Db::i_close(bool final)
{
if (m_ndb == 0)
return false;
LOGDEB(("Db::i_close(%d): m_isopen %d m_iswritable %d\n", final,
m_ndb->m_isopen, m_ndb->m_iswritable));
if (m_ndb->m_isopen == false && !final)
return true;
string ermsg;
try {
bool w = m_ndb->m_iswritable;
if (w) {
if (!m_ndb->m_noversionwrite)
m_ndb->xwdb.set_metadata(RCL_IDX_VERSION_KEY, RCL_IDX_VERSION);
LOGDEB(("Rcl::Db:close: xapian will close. May take some time\n"));
}
// Used to do a flush here. Cant see why it should be necessary.
deleteZ(m_ndb);
if (w)
LOGDEB(("Rcl::Db:close() xapian close done.\n"));
if (final) {
return true;
}
m_ndb = new Native(this);
if (m_ndb) {
return true;
}
LOGERR(("Rcl::Db::close(): cant recreate db object\n"));
return false;
} XCATCHERROR(ermsg);
LOGERR(("Db:close: exception while deleting db: %s\n", ermsg.c_str()));
return false;
}
// Reopen the db with a changed list of additional dbs
bool Db::adjustdbs()
{
if (m_mode != DbRO) {
LOGERR(("Db::adjustdbs: mode not RO\n"));
return false;
}
if (m_ndb && m_ndb->m_isopen) {
if (!close())
return false;
if (!open(m_mode)) {
return false;
}
}
return true;
}
int Db::docCnt()
{
int res = -1;
if (!m_ndb || !m_ndb->m_isopen)
return -1;
XAPTRY(res = m_ndb->xdb().get_doccount(), m_ndb->xrdb, m_reason);
if (!m_reason.empty()) {
LOGERR(("Db::docCnt: got error: %s\n", m_reason.c_str()));
return -1;
}
return res;
}
bool Db::addQueryDb(const string &dir)
{
LOGDEB(("Db::addQueryDb: ndb %p iswritable %d db [%s]\n", m_ndb,
(m_ndb)?m_ndb->m_iswritable:0, dir.c_str()));
if (!m_ndb)
return false;
if (m_ndb->m_iswritable)
return false;
if (find(m_extraDbs.begin(), m_extraDbs.end(), dir) == m_extraDbs.end()) {
m_extraDbs.push_back(dir);
}
return adjustdbs();
}
bool Db::rmQueryDb(const string &dir)
{
if (!m_ndb)
return false;
if (m_ndb->m_iswritable)
return false;
if (dir.empty()) {
m_extraDbs.clear();
} else {
list<string>::iterator it = find(m_extraDbs.begin(),
m_extraDbs.end(), dir);
if (it != m_extraDbs.end()) {
m_extraDbs.erase(it);
}
}
return adjustdbs();
}
bool Db::testDbDir(const string &dir)
{
string aerr;
LOGDEB(("Db::testDbDir: [%s]\n", dir.c_str()));
try {
Xapian::Database db(dir);
} XCATCHERROR(aerr);
if (!aerr.empty()) {
LOGERR(("Db::Open: error while trying to open database "
"from [%s]: %s\n", dir.c_str(), aerr.c_str()));
return false;
}
return true;
}
bool Db::isopen()
{
if (m_ndb == 0)
return false;
return m_ndb->m_isopen;
}
// Try to translate field specification into field prefix. We have a
// default table used if translations are not in the config for some
// reason (old config not updated ?). We use it only if the config
// translation fails. Also we add in there fields which should be
// indexed with no prefix (ie: abstract)
bool Db::fieldToPrefix(const string& fld, string &pfx)
{
// This is the default table. We prefer the data from rclconfig if
// available
static map<string, string> fldToPrefs;
if (fldToPrefs.empty()) {
fldToPrefs[Doc::keyabs] = string();
fldToPrefs["ext"] = "XE";
fldToPrefs[Doc::keyfn] = "XSFN";
fldToPrefs[keycap] = "S";
fldToPrefs[Doc::keytt] = "S";
fldToPrefs["subject"] = "S";
fldToPrefs[Doc::keyau] = "A";
fldToPrefs["creator"] = "A";
fldToPrefs["from"] = "A";
fldToPrefs[Doc::keykw] = "K";
fldToPrefs["keyword"] = "K";
fldToPrefs["tag"] = "K";
fldToPrefs["tags"] = "K";
}
if (m_config && m_config->getFieldPrefix(fld, pfx))
return true;
// No data in rclconfig? Check default values
map<string, string>::const_iterator it = fldToPrefs.find(fld);
if (it != fldToPrefs.end()) {
pfx = it->second;
return true;
}
return false;
}
// The text splitter callback class which receives words from the
// splitter and adds postings to the Xapian document.
class mySplitterCB : public TextSplitCB {
public:
Xapian::Document &doc; // Xapian document
Xapian::termpos basepos; // Base for document section
Xapian::termpos curpos; // Current position. Used to set basepos for the
// following section
StopList &stops;
mySplitterCB(Xapian::Document &d, StopList &_stops)
: doc(d), basepos(1), curpos(0), stops(_stops)
{}
bool takeword(const std::string &term, int pos, int, int);
void setprefix(const string& pref) {prefix = pref;}
private:
// If prefix is set, we also add a posting for the prefixed terms
// (ie: for titles, add postings for both "term" and "Sterm")
string prefix;
};
// Callback for the document to word splitting class during indexation
bool mySplitterCB::takeword(const std::string &_term, int pos, int, int)
{
#if 0
LOGDEB(("mySplitterCB::takeword:splitCb: [%s]\n", _term.c_str()));
#endif
string term;
if (!unacmaybefold(_term, term, "UTF-8", true)) {
LOGINFO(("Db::splitter::takeword: unac failed for [%s]\n", _term.c_str()));
term.clear();
// We don't generate a fatal error because of a bad term
return true;
}
if (stops.hasStops() && stops.isStop(term)) {
LOGDEB1(("Db: takeword [%s] in stop list\n", term.c_str()));
return true;
}
// Compute absolute position (pos is relative to current segment),
// and remember relative.
curpos = pos;
pos += basepos;
string ermsg;
try {
// Note: 1 is the within document frequency increment. It would
// be possible to assign different weigths to doc parts (ie title)
// by using a higher value
doc.add_posting(term, pos, 1);
if (!prefix.empty()) {
doc.add_posting(prefix + term, pos, 1);
}
return true;
} XCATCHERROR(ermsg);
LOGERR(("Db: xapian add_posting error %s\n", ermsg.c_str()));
return false;
}
// Let our user set the parameters for abstract processing
void Db::setAbstractParams(int idxtrunc, int syntlen, int syntctxlen)
{
LOGDEB1(("Db::setAbstractParams: trunc %d syntlen %d ctxlen %d\n",
idxtrunc, syntlen, syntctxlen));
if (idxtrunc > 0)
m_idxAbsTruncLen = idxtrunc;
if (syntlen > 0)
m_synthAbsLen = syntlen;
if (syntctxlen > 0)
m_synthAbsWordCtxLen = syntctxlen;
}
static inline void leftzeropad(string& s, unsigned len)
{
if (s.length() && s.length() < len)
s = s.insert(0, len-s.length(), '0');
}
static const int MB = 1024 * 1024;
static const string nc("\n\r\x0c");
#define RECORD_APPEND(R, NM, VAL) {R += NM + "=" + VAL + "\n";}
// Add document in internal form to the database: index the terms in
// the title abstract and body and add special terms for file name,
// date, mime type ... , create the document data record (more
// metadata), and update database
bool Db::addOrUpdate(const string &udi, const string &parent_udi,
const Doc &idoc)
{
LOGDEB(("Db::add: udi [%s] parent [%s]\n",
udi.c_str(), parent_udi.c_str()));
if (m_ndb == 0)
return false;
static int first = 1;
// Check file system full every mbyte of indexed text.
if (m_maxFsOccupPc > 0 && (first || (m_curtxtsz - m_occtxtsz) / MB >= 1)) {
LOGDEB(("Db::add: checking file system usage\n"));
int pc;
first = 0;
if (fsocc(m_basedir, &pc) && pc >= m_maxFsOccupPc) {
LOGERR(("Db::add: stop indexing: file system "
"%d%% full > max %d%%\n", pc, m_maxFsOccupPc));
return false;
}
m_occtxtsz = m_curtxtsz;
}
Doc doc = idoc;
Xapian::Document newdocument;
mySplitterCB splitData(newdocument, m_stops);
TextSplit splitter(&splitData);
// Split and index file name as document term(s)
LOGDEB2(("Db::add: split file name [%s]\n", fn.c_str()));
if (!splitter.text_to_words(doc.utf8fn))
LOGDEB(("Db::addOrUpdate: split failed for file name\n"));
splitData.basepos += splitData.curpos + 100;
// Index textual metadata. These are all indexed as text with
// positions, as we may want to do phrase searches with them (this
// makes no sense for keywords by the way).
//
// The order has no importance, and we set a position gap of 100
// between fields to avoid false proximity matches.
map<string,string>::iterator meta_it;
string pfx;
for (meta_it = doc.meta.begin(); meta_it != doc.meta.end(); meta_it++) {
if (!meta_it->second.empty()) {
if (!fieldToPrefix(meta_it->first, pfx)) {
LOGDEB0(("Db::add: no prefix for field [%s], no indexing\n",
meta_it->first.c_str()));
continue;
}
LOGDEB0(("Db::add: field [%s] pfx [%s]: [%s]\n",
meta_it->first.c_str(), pfx.c_str(),
meta_it->second.c_str()));
splitData.setprefix(pfx); // Subject
if (!splitter.text_to_words(meta_it->second))
LOGDEB(("Db::addOrUpdate: split failed for %s\n",
meta_it->first.c_str()));
splitData.setprefix(string());
splitData.basepos += splitData.curpos + 100;
}
}
if (splitData.curpos < baseTextPosition)
splitData.basepos = baseTextPosition;
else
splitData.basepos += splitData.curpos + 100;
// Split and index body text
LOGDEB2(("Db::add: split body\n"));
if (!splitter.text_to_words(doc.text))
LOGDEB(("Db::addOrUpdate: split failed for main text\n"));
////// Special terms for other metadata. No positions for these.
// Mime type
newdocument.add_term("T" + doc.mimetype);
// Simple file name indexed for file name searches with a term prefix
// We also add a term for the filename extension if any.
if (!doc.utf8fn.empty()) {
string fn;
if (unacmaybefold(doc.utf8fn, fn, "UTF-8", true)) {
// We should truncate after extracting the extension, but this is
// a pathological case anyway
if (fn.size() > 230)
utf8truncate(fn, 230);
string::size_type pos = fn.rfind('.');
if (pos != string::npos && pos != fn.length() - 1) {
newdocument.add_term(string("XE") + fn.substr(pos + 1));
}
fn = string("XSFN") + fn;
newdocument.add_term(fn);
}
}
// Udi unique term: this is used for file existence/uptodate
// checks, and unique id for the replace_document() call.
string uniterm = make_uniterm(udi);
newdocument.add_term(uniterm);
// Parent term. This is used to find all descendents, mostly to delete them
// when the parent goes away
if (!parent_udi.empty()) {
newdocument.add_term(make_parentterm(parent_udi));
}
// Dates etc...
time_t mtime = atol(doc.dmtime.empty() ? doc.fmtime.c_str() :
doc.dmtime.c_str());
struct tm *tm = localtime(&mtime);
char buf[9];
sprintf(buf, "%04d%02d%02d",tm->tm_year+1900, tm->tm_mon + 1, tm->tm_mday);
newdocument.add_term("D" + string(buf)); // Date (YYYYMMDD)
buf[6] = '\0';
newdocument.add_term("M" + string(buf)); // Month (YYYYMM)
buf[4] = '\0';
newdocument.add_term("Y" + string(buf)); // Year (YYYY)
//////////////////////////////////////////////////////////////////
// Document data record. omindex has the following nl separated fields:
// - url
// - sample
// - caption (title limited to 100 chars)
// - mime type
//
// The title, author, abstract and keywords fields are special,
// they always get stored in the document data
// record. Configurable other fields can be, too.
//
// We truncate stored fields abstract, title and keywords to
// reasonable lengths and suppress newlines (so that the data
// record can keep a simple syntax)
string record;
RECORD_APPEND(record, Doc::keyurl, doc.url);
RECORD_APPEND(record, Doc::keytp, doc.mimetype);
// We left-zero-pad the times so that they are lexico-sortable
leftzeropad(doc.fmtime, 11);
RECORD_APPEND(record, Doc::keyfmt, doc.fmtime);
if (!doc.dmtime.empty()) {
leftzeropad(doc.dmtime, 11);
RECORD_APPEND(record, Doc::keydmt, doc.dmtime);
}
RECORD_APPEND(record, Doc::keyoc, doc.origcharset);
if (!doc.fbytes.empty())
RECORD_APPEND(record, Doc::keyfs, doc.fbytes);
// Note that we add the signature both as a value and in the data record
if (!doc.sig.empty())
RECORD_APPEND(record, Doc::keysig, doc.sig);
newdocument.add_value(VALUE_SIG, doc.sig);
char sizebuf[30];
sprintf(sizebuf, "%u", (unsigned int)doc.text.length());
RECORD_APPEND(record, Doc::keyds, sizebuf);
if (!doc.ipath.empty())
RECORD_APPEND(record, Doc::keyipt, doc.ipath);
if (doc.meta[Doc::keytt].empty())
doc.meta[Doc::keytt] = doc.utf8fn;
doc.meta[Doc::keytt] =
neutchars(truncate_to_word(doc.meta[Doc::keytt], 150), nc);
if (!doc.meta[Doc::keytt].empty())
RECORD_APPEND(record, keycap, doc.meta[Doc::keytt]);
doc.meta[Doc::keykw] =
neutchars(truncate_to_word(doc.meta[Doc::keykw], 300), nc);
if (!doc.meta[Doc::keykw].empty())
RECORD_APPEND(record, Doc::keykw, doc.meta[Doc::keykw]);
// If abstract is empty, we make up one with the beginning of the
// document. This is then not indexed, but part of the doc data so
// that we can return it to a query without having to decode the
// original file.
bool syntabs = false;
// Note that the map accesses by operator[] create empty entries if they
// don't exist yet.
if (doc.meta[Doc::keyabs].empty()) {
syntabs = true;
if (!doc.text.empty())
doc.meta[Doc::keyabs] = rclSyntAbs +
neutchars(truncate_to_word(doc.text, m_idxAbsTruncLen), nc);
} else {
doc.meta[Doc::keyabs] =
neutchars(truncate_to_word(doc.meta[Doc::keyabs], m_idxAbsTruncLen),
nc);
}
if (!doc.meta[Doc::keyabs].empty())
RECORD_APPEND(record, Doc::keyabs, doc.meta[Doc::keyabs]);
const set<string>& stored = m_config->getStoredFields();
for (set<string>::const_iterator it = stored.begin();
it != stored.end(); it++) {
string nm = m_config->fieldCanon(*it);
if (!doc.meta[*it].empty()) {
string value =
neutchars(truncate_to_word(doc.meta[*it], 150), nc);
RECORD_APPEND(record, nm, value);
}
}
// If the file's md5 was computed, add value. This is optionally
// used for query result duplicate elimination.
string& md5 = doc.meta[Doc::keymd5];
if (!md5.empty()) {
string digest;
MD5HexScan(md5, digest);
newdocument.add_value(VALUE_MD5, digest);
}
LOGDEB0(("Rcl::Db::add: new doc record:\n%s\n", record.c_str()));
newdocument.set_data(record);
const char *fnc = udi.c_str();
string ermsg;
// Add db entry or update existing entry:
try {
Xapian::docid did =
m_ndb->xwdb.replace_document(uniterm, newdocument);
if (did < updated.size()) {
updated[did] = true;
LOGDEB(("Db::add: docid %d updated [%s]\n", did, fnc));
} else {
LOGDEB(("Db::add: docid %d added [%s]\n", did, fnc));
}
} XCATCHERROR(ermsg);
if (!ermsg.empty()) {
LOGERR(("Db::add: replace_document failed: %s\n", ermsg.c_str()));
ermsg.erase();
// FIXME: is this ever actually needed?
try {
m_ndb->xwdb.add_document(newdocument);
LOGDEB(("Db::add: %s added (failed re-seek for duplicate)\n",
fnc));
} XCATCHERROR(ermsg);
if (!ermsg.empty()) {
LOGERR(("Db::add: add_document failed: %s\n", ermsg.c_str()));
return false;
}
}
// Test if we're over the flush threshold (limit memory usage):
m_curtxtsz += doc.text.length();
if (m_flushMb > 0) {
if ((m_curtxtsz - m_flushtxtsz) / MB >= m_flushMb) {
ermsg.erase();
LOGDEB(("Db::add: text size >= %d Mb, flushing\n", m_flushMb));
try {
m_ndb->xwdb.flush();
} XCATCHERROR(ermsg);
if (!ermsg.empty()) {
LOGERR(("Db::add: flush() failed: %s\n", ermsg.c_str()));
return false;
}
m_flushtxtsz = m_curtxtsz;
}
}
return true;
}
// Test if doc given by udi has changed since last indexed (test sigs)
bool Db::needUpdate(const string &udi, const string& sig)
{
if (m_ndb == 0)
return false;
string uniterm = make_uniterm(udi);
string ermsg;
// We look up the document indexed by the uniterm. This is either
// the actual document file, or, for a multi-document file, the
// pseudo-doc we create to stand for the file itself.
// We try twice in case database needs to be reopened.
for (int tries = 0; tries < 2; tries++) {
try {
// Get the doc or pseudo-doc
Xapian::PostingIterator docid =m_ndb->xrdb.postlist_begin(uniterm);
if (docid == m_ndb->xrdb.postlist_end(uniterm)) {
// If no document exist with this path, we do need update
LOGDEB(("Db::needUpdate:yes (new): [%s]\n", uniterm.c_str()));
return true;
}
Xapian::Document doc = m_ndb->xrdb.get_document(*docid);
// Retrieve old file/doc signature from value
string osig = doc.get_value(VALUE_SIG);
LOGDEB2(("Db::needUpdate: oldsig [%s] new [%s]\n",
osig.c_str(), sig.c_str()));
// Compare new/old sig
if (sig != osig) {
LOGDEB(("Db::needUpdate:yes: olsig [%s] new [%s]\n",
osig.c_str(), sig.c_str()));
// Db is not up to date. Let's index the file
return true;
}
LOGDEB(("Db::needUpdate:no: [%s]\n", uniterm.c_str()));
// Up to date.
// Set the uptodate flag for doc / pseudo doc
updated[*docid] = true;
// Set the existence flag for all the subdocs (if any)
vector<Xapian::docid> docids;
if (!m_ndb->subDocs(udi, docids)) {
LOGERR(("Rcl::Db::needUpdate: can't get subdocs list\n"));
return true;
}
for (vector<Xapian::docid>::iterator it = docids.begin();
it != docids.end(); it++) {
if (*it < updated.size()) {
LOGDEB2(("Db::needUpdate: set flag for docid %d\n", *it));
updated[*it] = true;
}
}
return false;
} catch (const Xapian::DatabaseModifiedError &e) {
LOGDEB(("Db::needUpdate: got modified error. reopen/retry\n"));
m_reason = e.get_msg();
m_ndb->xrdb.reopen();
continue;
} XCATCHERROR(m_reason);
break;
}
LOGERR(("Db::needUpdate: error while checking existence: %s\n",
m_reason.c_str()));
return true;
}
// Return list of existing stem db languages
list<string> Db::getStemLangs()
{
LOGDEB(("Db::getStemLang\n"));
list<string> dirs;
if (m_ndb == 0 || m_ndb->m_isopen == false)
return dirs;
dirs = StemDb::getLangs(m_basedir);
return dirs;
}
/**
* Delete stem db for given language
*/
bool Db::deleteStemDb(const string& lang)
{
LOGDEB(("Db::deleteStemDb(%s)\n", lang.c_str()));
if (m_ndb == 0 || m_ndb->m_isopen == false)
return false;
return StemDb::deleteDb(m_basedir, lang);
}
/**
* Create database of stem to parents associations for a given language.
* We walk the list of all terms, stem them, and create another Xapian db
* with documents indexed by a single term (the stem), and with the list of
* parent terms in the document data.
*/
bool Db::createStemDb(const string& lang)
{
LOGDEB(("Db::createStemDb(%s)\n", lang.c_str()));
if (m_ndb == 0 || m_ndb->m_isopen == false)
return false;
return StemDb::createDb(m_ndb->xdb(), m_basedir, lang);
}
/**
* This is called at the end of an indexing session, to delete the
* documents for files that are no longer there. This can ONLY be called
* after a full file-system tree walk, else the file existence flags will
* be wrong.
*/
bool Db::purge()
{
LOGDEB(("Db::purge\n"));
if (m_ndb == 0)
return false;
LOGDEB(("Db::purge: m_isopen %d m_iswritable %d\n", m_ndb->m_isopen,
m_ndb->m_iswritable));
if (m_ndb->m_isopen == false || m_ndb->m_iswritable == false)
return false;
// For xapian versions up to 1.0.1, deleting a non-existant
// document would trigger an exception that would discard any
// pending update. This could lose both previous added documents
// or deletions. Adding the flush before the delete pass ensured
// that any added document would go to the index. Kept here
// because it doesn't really hurt.
try {
m_ndb->xwdb.flush();
} catch (...) {
LOGERR(("Db::purge: 1st flush failed\n"));
}
// Walk the document array and delete any xapian document whose
// flag is not set (we did not see its source during indexing).
for (Xapian::docid docid = 1; docid < updated.size(); ++docid) {
if (!updated[docid]) {
try {
m_ndb->xwdb.delete_document(docid);
LOGDEB(("Db::purge: deleted document #%d\n", docid));
} catch (const Xapian::DocNotFoundError &) {
LOGDEB0(("Db::purge: document #%d not found\n", docid));
} catch (const Xapian::Error &e) {
LOGERR(("Db::purge: document #%d: %s\n", docid, e.get_msg().c_str()));
} catch (...) {
LOGERR(("Db::purge: document #%d: unknown error\n", docid));
}
}
}
try {
m_ndb->xwdb.flush();
} catch (...) {
LOGERR(("Db::purge: 2nd flush failed\n"));
}
return true;
}
/* Delete document(s) for given unique identifier (doc and descendents) */
bool Db::purgeFile(const string &udi, bool *existed)
{
LOGDEB(("Db:purgeFile: [%s]\n", udi.c_str()));
if (m_ndb == 0 || !m_ndb->m_iswritable)
return false;
Xapian::WritableDatabase db = m_ndb->xwdb;
string uniterm = make_uniterm(udi);
string ermsg;
try {
Xapian::PostingIterator docid = db.postlist_begin(uniterm);
if (docid == db.postlist_end(uniterm)) {
if (existed)
*existed = false;
return true;
}
*existed = true;
LOGDEB(("purgeFile: delete docid %d\n", *docid));
db.delete_document(*docid);
vector<Xapian::docid> docids;
m_ndb->subDocs(udi, docids);
LOGDEB(("purgeFile: subdocs cnt %d\n", docids.size()));
for (vector<Xapian::docid>::iterator it = docids.begin();
it != docids.end(); it++) {
LOGDEB(("Db::purgeFile: delete subdoc %d\n", *it));
db.delete_document(*it);
}
return true;
} XCATCHERROR(ermsg);
if (!ermsg.empty()) {
LOGERR(("Db::purgeFile: %s\n", ermsg.c_str()));
}
return false;
}
// File name wild card expansion. This is a specialisation ot termMatch
bool Db::filenameWildExp(const string& fnexp, list<string>& names)
{
string pattern;
if (!unacmaybefold(fnexp, pattern, "UTF-8", true)) {
LOGERR(("Db::filenameWildExp: unac error for [%s]\n", fnexp.c_str()));
return false;
}
names.clear();
// If pattern is not quoted, and has no wildcards, we add * at
// each end: match any substring
if (pattern[0] == '"' && pattern[pattern.size()-1] == '"') {
pattern = pattern.substr(1, pattern.size() -2);
} else if (pattern.find_first_of("*?[") == string::npos) {
pattern = "*" + pattern + "*";
} // else let it be
LOGDEB(("Rcl::Db::filenameWildExp: pattern: [%s]\n", pattern.c_str()));
list<TermMatchEntry> entries;
if (!termMatch(ET_WILD, string(), pattern, entries, 1000, Doc::keyfn))
return false;
for (list<TermMatchEntry>::const_iterator it = entries.begin();
it != entries.end(); it++)
names.push_back("XSFN"+it->term);
if (names.empty()) {
// Build an impossible query: we know its impossible because we
// control the prefixes!
names.push_back("XIMPOSSIBLE");
}
return true;
}
class TermMatchCmpByWcf {
public:
int operator()(const TermMatchEntry& l, const TermMatchEntry& r) {
return r.wcf - l.wcf < 0;
}
};
class TermMatchCmpByTerm {
public:
int operator()(const TermMatchEntry& l, const TermMatchEntry& r) {
return l.term.compare(r.term) > 0;
}
};
class TermMatchTermEqual {
public:
int operator()(const TermMatchEntry& l, const TermMatchEntry& r) {
return !l.term.compare(r.term);
}
};
bool Db::stemExpand(const string &lang, const string &term,
list<TermMatchEntry>& result, int max)
{
list<string> dirs = m_extraDbs;
dirs.push_front(m_basedir);
for (list<string>::iterator it = dirs.begin();
it != dirs.end(); it++) {
list<string> more;
StemDb::stemExpand(*it, lang, term, more);
LOGDEB1(("Db::stemExpand: Got %d from %s\n",
more.size(), it->c_str()));
result.insert(result.end(), more.begin(), more.end());
if (result.size() >= (unsigned int)max)
break;
}
LOGDEB1(("Db:::stemExpand: final count %d \n", result.size()));
return true;
}
// Characters that can begin a wildcard or regexp expression. We use skipto
// to begin the allterms search with terms that begin with the portion of
// the input string prior to these chars.
const string wildSpecChars = "*?[";
const string regSpecChars = "(.[{";
// Find all index terms that match a wildcard or regular expression
bool Db::termMatch(MatchType typ, const string &lang,
const string &root,
list<TermMatchEntry>& res,
int max,
const string& field)
{
if (!m_ndb || !m_ndb->m_isopen)
return false;
Xapian::Database xdb = m_ndb->xdb();
res.clear();
// Get rid of capitals and accents
string droot;
if (!unacmaybefold(root, droot, "UTF-8", true)) {
LOGERR(("Db::termMatch: unac failed for [%s]\n", root.c_str()));
return false;
}
string nochars = typ == ET_WILD ? wildSpecChars : regSpecChars;
string prefix;
if (!field.empty()) {
(void)fieldToPrefix(field, prefix);
}
if (typ == ET_STEM) {
if (!stemExpand(lang, root, res, max))
return false;
res.sort();
res.unique();
for (list<TermMatchEntry>::iterator it = res.begin();
it != res.end(); it++) {
XAPTRY(it->wcf = xdb.get_collection_freq(it->term),
xdb, m_reason);
if (!m_reason.empty())
return false;
LOGDEB1(("termMatch: %d [%s]\n", it->wcf, it->term.c_str()));
}
} else {
regex_t reg;
int errcode;
if (typ == ET_REGEXP) {
string mroot = droot;
if ((errcode = regcomp(®, mroot.c_str(),
REG_EXTENDED|REG_NOSUB))) {
char errbuf[200];
regerror(errcode, ®, errbuf, 199);
LOGERR(("termMatch: regcomp failed: %s\n", errbuf));
res.push_back(string(errbuf));
regfree(®);
return false;
}
}
// Find the initial section before any special char
string::size_type es = droot.find_first_of(nochars);
string is;
switch (es) {
case string::npos: is = prefix + droot; break;
case 0: is = prefix; break;
default: is = prefix + droot.substr(0, es); break;
}
LOGDEB(("termMatch: initsec: [%s]\n", is.c_str()));
for (int tries = 0; tries < 2; tries++) {
try {
Xapian::TermIterator it = xdb.allterms_begin();
if (!is.empty())
it.skip_to(is.c_str());
for (int n = 0; it != xdb.allterms_end(); it++) {
// If we're beyond the terms matching the initial
// string, end
if (!is.empty() && (*it).find(is) != 0)
break;
string term;
if (!prefix.empty())
term = (*it).substr(prefix.length());
else
term = *it;
if (typ == ET_WILD) {
if (fnmatch(droot.c_str(), term.c_str(), 0) ==
FNM_NOMATCH)
continue;
} else {
if (regexec(®, term.c_str(), 0, 0, 0))
continue;
}
// Do we want stem expansion here? We don't do it for now
res.push_back(TermMatchEntry(term, it.get_termfreq()));
++n;
}
m_reason.erase();
break;
} catch (const Xapian::DatabaseModifiedError &e) {
m_reason = e.get_msg();
xdb.reopen();
continue;
} XCATCHERROR(m_reason);
break;
}
if (!m_reason.empty()) {
LOGERR(("termMatch: %s\n", m_reason.c_str()));
return false;
}
if (typ == ET_REGEXP) {
regfree(®);
}
}
TermMatchCmpByTerm tcmp;
res.sort(tcmp);
TermMatchTermEqual teq;
res.unique(teq);
TermMatchCmpByWcf wcmp;
res.sort(wcmp);
if (max > 0) {
res.resize(MIN(res.size(), (unsigned int)max));
}
return true;
}
/** Term list walking. */
class TermIter {
public:
Xapian::TermIterator it;
Xapian::Database db;
};
TermIter *Db::termWalkOpen()
{
if (!m_ndb || !m_ndb->m_isopen)
return 0;
TermIter *tit = new TermIter;
if (tit) {
tit->db = m_ndb->xdb();
XAPTRY(tit->it = tit->db.allterms_begin(), tit->db, m_reason);
if (!m_reason.empty()) {
LOGERR(("Db::termWalkOpen: xapian error: %s\n", m_reason.c_str()));
return 0;
}
}
return tit;
}
bool Db::termWalkNext(TermIter *tit, string &term)
{
XAPTRY(
if (tit && tit->it != tit->db.allterms_end()) {
term = *(tit->it)++;
return true;
}
, tit->db, m_reason);
if (!m_reason.empty()) {
LOGERR(("Db::termWalkOpen: xapian error: %s\n", m_reason.c_str()));
}
return false;
}
void Db::termWalkClose(TermIter *tit)
{
try {
delete tit;
} catch (...) {}
}
bool Db::termExists(const string& word)
{
if (!m_ndb || !m_ndb->m_isopen)
return 0;
XAPTRY(if (!m_ndb->xdb().term_exists(word)) return false,
m_ndb->xrdb, m_reason);
if (!m_reason.empty()) {
LOGERR(("Db::termWalkOpen: xapian error: %s\n", m_reason.c_str()));
return false;
}
return true;
}
bool Db::stemDiffers(const string& lang, const string& word,
const string& base)
{
Xapian::Stem stemmer(lang);
if (!stemmer(word).compare(stemmer(base))) {
LOGDEB2(("Rcl::Db::stemDiffers: same for %s and %s\n",
word.c_str(), base.c_str()));
return false;
}
return true;
}
bool Db::makeDocAbstract(Doc &doc, Query *query, string& abstract)
{
LOGDEB1(("Db::makeDocAbstract: exti %d\n", exti));
if (!m_ndb || !m_ndb->m_isopen) {
LOGERR(("Db::makeDocAbstract: no db\n"));
return false;
}
XAPTRY(abstract = m_ndb->makeAbstract(doc.xdocid, query),
m_ndb->xrdb, m_reason);
return m_reason.empty() ? true : false;
}
// Retrieve document defined by Unique doc identifier. This is mainly used
// by the GUI history feature
bool Db::getDoc(const string &udi, Doc &doc)
{
LOGDEB(("Db:getDoc: [%s]\n", udi.c_str()));
if (m_ndb == 0)
return false;
// Initialize what we can in any case. If this is history, caller
// will make partial display in case of error
doc.pc = 100;
string uniterm = make_uniterm(udi);
for (int tries = 0; tries < 2; tries++) {
try {
if (!m_ndb->xrdb.term_exists(uniterm)) {
// Document found in history no longer in the
// database. We return true (because their might be
// other ok docs further) but indicate the error with
// pc = -1
doc.pc = -1;
LOGINFO(("Db:getDoc: no such doc in index: [%s] (len %d)\n",
uniterm.c_str(), uniterm.length()));
return true;
}
Xapian::PostingIterator docid =
m_ndb->xrdb.postlist_begin(uniterm);
Xapian::Document xdoc = m_ndb->xrdb.get_document(*docid);
string data = xdoc.get_data();
doc.meta[Rcl::Doc::keyudi] = udi;
return m_ndb->dbDataToRclDoc(*docid, data, doc, 100);
} catch (const Xapian::DatabaseModifiedError &e) {
m_reason = e.get_msg();
m_ndb->xrdb.reopen();
continue;
} XCATCHERROR(m_reason);
break;
}
LOGERR(("Db::getDoc: %s\n", m_reason.c_str()));
return false;
}
#ifndef NO_NAMESPACES
}
#endif