summaryrefslogtreecommitdiff
path: root/tools/assistant/lib/qhelpsearchengine.cpp
blob: 893495d35f50feb701061967c2dd21ffc38b9889 (plain)
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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the Qt Assistant of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qhelpenginecore.h"
#include "qhelpsearchengine.h"
#include "qhelpsearchquerywidget.h"
#include "qhelpsearchresultwidget.h"

#include "qhelpsearchindexreader_p.h"
#if defined(QT_CLUCENE_SUPPORT)
#   include "qhelpsearchindexreader_clucene_p.h"
#   include "qhelpsearchindexwriter_clucene_p.h"
#else
#   include "qhelpsearchindexreader_default_p.h"
#   include "qhelpsearchindexwriter_default_p.h"
#endif

#include <QtCore/QDir>
#include <QtCore/QFile>
#include <QtCore/QFileInfo>
#include <QtCore/QVariant>
#include <QtCore/QThread>
#include <QtCore/QPointer>

QT_BEGIN_NAMESPACE

#if defined(QT_CLUCENE_SUPPORT)
    using namespace qt::fulltextsearch::clucene;
#else
    using namespace qt::fulltextsearch::std;
#endif

class QHelpSearchEnginePrivate : public QObject
{
    Q_OBJECT

signals:
    void indexingStarted();
    void indexingFinished();

    void searchingStarted();
    void searchingFinished(int hits);

private:
    QHelpSearchEnginePrivate(QHelpEngineCore *helpEngine)
        : queryWidget(0)
        , resultWidget(0)
        , helpEngine(helpEngine)
    {
        indexReader = 0;
        indexWriter = 0;
    }

    ~QHelpSearchEnginePrivate()
    {
        delete indexReader;
        delete indexWriter;
    }

    int hitCount() const
    {
        int count = 0;
        if (indexReader)
            count = indexReader->hitCount();

        return count;
    }

    QList<QHelpSearchEngine::SearchHit> hits(int start, int end) const
    {
        return indexReader ?
                indexReader->hits(start, end) :
                QList<QHelpSearchEngine::SearchHit>();
    }

    void updateIndex(bool reindex = false)
    {
        if (helpEngine.isNull())
            return;

        if (!QFile::exists(QFileInfo(helpEngine->collectionFile()).path()))
            return;

        if (!indexWriter) {
            indexWriter = new QHelpSearchIndexWriter();

            connect(indexWriter, SIGNAL(indexingStarted()), this, SIGNAL(indexingStarted()));
            connect(indexWriter, SIGNAL(indexingFinished()), this, SIGNAL(indexingFinished()));
            connect(indexWriter, SIGNAL(indexingFinished()), this, SLOT(optimizeIndex()));
        }

        indexWriter->cancelIndexing();
        indexWriter->updateIndex(helpEngine->collectionFile(),
                                 indexFilesFolder(), reindex);
    }

    void cancelIndexing()
    {
        if (indexWriter)
            indexWriter->cancelIndexing();
    }

    void search(const QList<QHelpSearchQuery> &queryList)
    {
        if (helpEngine.isNull())
            return;

        if (!QFile::exists(QFileInfo(helpEngine->collectionFile()).path()))
            return;

        if (!indexReader) {
#if defined(QT_CLUCENE_SUPPORT)
            indexReader = new QHelpSearchIndexReaderClucene();
#else
            indexReader = new QHelpSearchIndexReaderDefault();
#endif // QT_CLUCENE_SUPPORT
            connect(indexReader, SIGNAL(searchingStarted()), this, SIGNAL(searchingStarted()));
            connect(indexReader, SIGNAL(searchingFinished(int)), this, SIGNAL(searchingFinished(int)));
        }

        m_queryList = queryList;
        indexReader->cancelSearching();
        indexReader->search(helpEngine->collectionFile(), indexFilesFolder(), queryList);
    }

    void cancelSearching()
    {
        if (indexReader)
            indexReader->cancelSearching();
    }

    QString indexFilesFolder() const
    {
        QString indexFilesFolder = QLatin1String(".fulltextsearch");
        if (helpEngine && !helpEngine->collectionFile().isEmpty()) {
            QFileInfo fi(helpEngine->collectionFile());
            indexFilesFolder = fi.absolutePath() + QDir::separator()
                + QLatin1Char('.')
                + fi.fileName().left(fi.fileName().lastIndexOf(QLatin1String(".qhc")));
        }
        return indexFilesFolder;
    }

private slots:
    void optimizeIndex()
    {
#if defined(QT_CLUCENE_SUPPORT)
        if (indexWriter && !helpEngine.isNull()) {
            indexWriter->optimizeIndex();
        }
#endif
    }

private:
    friend class QHelpSearchEngine;

    QHelpSearchQueryWidget *queryWidget;
    QHelpSearchResultWidget *resultWidget;

    qt::fulltextsearch::QHelpSearchIndexReader *indexReader;
    QHelpSearchIndexWriter *indexWriter;

    QPointer<QHelpEngineCore> helpEngine;

    QList<QHelpSearchQuery> m_queryList;
};

#include "qhelpsearchengine.moc"


/*!
    \class QHelpSearchQuery
    \since 4.4
    \inmodule QtHelp
    \brief The QHelpSearchQuery class contains the field name and the associated
    search term

    The QHelpSearchQuery class contains the field name and the associated search
    term. Depending on the field the search term might get split up into seperate
    terms to be parsed differently by the search engine.

    \sa QHelpSearchQueryWidget
*/

/*!
    \fn QHelpSearchQuery::QHelpSearchQuery()

    Constructs a new empty QHelpSearchQuery.
*/

/*!
    \fn QHelpSearchQuery::QHelpSearchQuery(FieldName field, const QStringList &wordList)

    Constructs a new QHelpSearchQuery and initializes it with the given \a field and \a wordList.
*/

/*!
    \enum QHelpSearchQuery::FieldName
    This enum type specifies the field names that are handled by the search engine.

    \value DEFAULT  the default field provided by the search widget, several terms should be
                    split and stored in the word list except search terms enclosed in quotes.
    \value FUZZY    a field only provided in use with clucene. Terms should be split in seperate
                    words and passed to the search engine.
    \value WITHOUT  a field only provided in use with clucene. Terms should be split in seperate
                    words and passed to the search engine.
    \value PHRASE   a field only provided in use with clucene. Terms should not be split in seperate
                    words.
    \value ALL      a field only provided in use with clucene. Terms should be split in seperate
                    words and passed to the search engine
    \value ATLEAST  a field only provided in use with clucene. Terms should be split in seperate
                    words and passed to the search engine
*/

/*!
    \class QHelpSearchEngine
    \since 4.4
    \inmodule QtHelp
    \brief The QHelpSearchEngine class provides access to widgets reusable
    to integrate fulltext search as well as to index and search documentation.

    Before the search engine can be used, one has to instantiate at least a
    QHelpEngineCore object that needs to be passed to the search engines constructor.
    This is required as the search engine needs to be connected to the help
    engines setupFinished() signal to know when it can start to index documentation.

    After starting the indexing process the signal indexingStarted() is emitted and
    on the end of the indexing process the indexingFinished() is emited. To stop
    the indexing one can call cancelIndexing().

    While the indexing process has finished, the search engine can now be used to search
    thru its index for a given term. To do this one may use the possibility of creating the
    QHelpSearchQuery list by self or reuse the QHelpSearchQueryWidget which has the inbuild
    functionality to set up a proper search querys list that get's passed to the search engines
    search() function.

    After the list of querys has been passed to the search engine, the signal searchingStarted()
    is emited and after the search has finished the searchingFinished() signal is emited. The
    search process can be stopped by calling cancelSearching().

    If the search succeeds, the searchingFinished() will be called with the search hits count,
    which can be reused to fetch the search hits from the search engine. Calling the hits()
    function with the range of hits you would like to get will return a list of the requested
    SearchHits. They basically constist at the moment of a pair of strings where the values
    of that pair are the documentation file path and the page title.

    To display the given hits use the QHelpSearchResultWidget or build up your own one if you need
    more advanced functionality. Note that the QHelpSearchResultWidget can not be instantiated
    directly, you must retrieve the widget from the search engine in use as all connections will be
    established for you by the widget itself.
*/

/*!
    \fn void QHelpSearchEngine::indexingStarted()

    This signal is emitted when indexing process is started.
*/

/*!
    \fn void QHelpSearchEngine::indexingFinished()

    This signal is emitted when the indexing process is complete.
*/

/*!
    \fn void QHelpSearchEngine::searchingStarted()

    This signal is emitted when the search process is started.
*/

/*!
    \fn void QHelpSearchEngine::searchingFinished(int hits)

    This signal is emitted when the search process is complete.
    The hit count is stored in \a hits.
*/

/*!
    Constructs a new search engine with the given \a parent. The search engine
    uses the given \a helpEngine to access the documentation that needs to be indexed.
    The QHelpEngine's setupFinished() signal is automatically connected to the
    QHelpSearchEngine's indexing function, so that new documentation will be indexed
    after the signal is emited.
*/
QHelpSearchEngine::QHelpSearchEngine(QHelpEngineCore *helpEngine, QObject *parent)
    : QObject(parent)
{
    d = new QHelpSearchEnginePrivate(helpEngine);

    connect(helpEngine, SIGNAL(setupFinished()), this, SLOT(indexDocumentation()));

    connect(d, SIGNAL(indexingStarted()), this, SIGNAL(indexingStarted()));
    connect(d, SIGNAL(indexingFinished()), this, SIGNAL(indexingFinished()));
    connect(d, SIGNAL(searchingStarted()), this, SIGNAL(searchingStarted()));
    connect(d, SIGNAL(searchingFinished(int)), this, SIGNAL(searchingFinished(int)));
}

/*!
    Destructs the search engine.
*/
QHelpSearchEngine::~QHelpSearchEngine()
{
    delete d;
}

/*!
    Returns a widget to use as input widget. Depending on your search engine
    configuration you will get a different widget with more or less subwidgets.
*/
QHelpSearchQueryWidget* QHelpSearchEngine::queryWidget()
{
    if (!d->queryWidget)
        d->queryWidget = new QHelpSearchQueryWidget();

    return d->queryWidget;
}

/*!
    Returns a widget that can hold and display the search results.
*/
QHelpSearchResultWidget* QHelpSearchEngine::resultWidget()
{
    if (!d->resultWidget)
        d->resultWidget = new QHelpSearchResultWidget(this);

    return d->resultWidget;
}

/*!
    \obsolete
    Returns the amount of hits the search engine found.
    \sa hitCount()
*/
int QHelpSearchEngine::hitsCount() const
{
    return d->hitCount();
}

/*!
    \since 4.6
    Returns the amount of hits the search engine found.
*/
int QHelpSearchEngine::hitCount() const
{
    return d->hitCount();
}

/*!
    \typedef QHelpSearchEngine::SearchHit

    Typedef for QPair<QString, QString>.
    The values of that pair are the documentation file path and the page title.

    \sa hits()
*/

/*!
    Returns a list of search hits within the range of \a start \a end.
*/
QList<QHelpSearchEngine::SearchHit> QHelpSearchEngine::hits(int start, int end) const
{
   return d->hits(start, end);
}

/*!
    Returns the list of queries last searched for.
    \since 4.5
*/
QList<QHelpSearchQuery> QHelpSearchEngine::query() const
{
    return d->m_queryList;
}

/*!
    Forces the search engine to reindex all documentation files.
*/
void QHelpSearchEngine::reindexDocumentation()
{
    d->updateIndex(true);
}

/*!
    Stops the indexing process.
*/
void QHelpSearchEngine::cancelIndexing()
{
    d->cancelIndexing();
}

/*!
    Stops the search process.
*/
void QHelpSearchEngine::cancelSearching()
{
    d->cancelSearching();
}

/*!
    Starts the search process using the given list of querys \a queryList
    build by the search field name and the values to search for.
*/
void QHelpSearchEngine::search(const QList<QHelpSearchQuery> &queryList)
{
    d->search(queryList);
}

void QHelpSearchEngine::indexDocumentation()
{
    d->updateIndex();
}

QT_END_NAMESPACE