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kfilemetadatareader.cpp
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1/*****************************************************************************
2 * Copyright (C) 2011 by Peter Penz <peter.penz19@gmail.com> *
3 * *
4 * This library is free software; you can redistribute it and/or *
5 * modify it under the terms of the GNU Library General Public *
6 * License as published by the Free Software Foundation; either *
7 * version 2 of the License, or (at your option) any later version. *
8 * *
9 * This library is distributed in the hope that it will be useful, *
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
12 * Library General Public License for more details. *
13 * *
14 * You should have received a copy of the GNU Library General Public License *
15 * along with this library; see the file COPYING.LIB. If not, write to *
16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, *
17 * Boston, MA 02110-1301, USA. *
18 *****************************************************************************/
19
20#include "kfilemetadatareader_p.h"
21
22#include <kprocess.h>
23#include <kstandarddirs.h>
24
25class KFileMetaDataReader::Private
26{
27public:
28 Private(KFileMetaDataReader* parent);
29 ~Private();
30
31 void slotLoadingFinished(int exitCode, QProcess::ExitStatus exitStatus);
32
33 bool m_readContextData;
34 KProcess* m_process;
35 QHash<KUrl, Nepomuk::Variant> m_metaData;
36
37private:
38 KFileMetaDataReader* const q;
39};
40
41KFileMetaDataReader::Private::Private(KFileMetaDataReader* parent) :
42 m_readContextData(true),
43 m_process(new KProcess()),
44 m_metaData(),
45 q(parent)
46{
47}
48
49KFileMetaDataReader::Private::~Private()
50{
51 delete m_process;
52}
53
54void KFileMetaDataReader::Private::slotLoadingFinished(int exitCode, QProcess::ExitStatus exitStatus)
55{
56 Q_UNUSED(exitCode);
57 Q_UNUSED(exitStatus);
58
59 QDataStream in(QByteArray::fromBase64(m_process->readLine()));
60
61 KUrl key;
62 Nepomuk::Variant value;
63 while (!in.atEnd()) {
64 in >> key;
65
66 // Unlike QVariant no streaming operators are implemented for Nepomuk::Variant.
67 // So it is required to manually decode the variant from the stream. See
68 // function sendMetaData() in kfilemetadatareaderprocess.cpp for the encoding
69 // counterpart.
70 int streamType;
71 in >> streamType;
72
73 switch (streamType) {
74 case 0: {
75 QStringList stringList;
76 in >> stringList;
77 value = stringList;
78 break;
79 }
80 case 1: {
81 QString resource;
82 in >> resource;
83 value = resource;
84 break;
85 }
86
87 default:
88 QVariant variant;
89 in >> variant;
90 value = Nepomuk::Variant(variant);
91 }
92
93 m_metaData.insert(key, value);
94 }
95
96 emit q->finished();
97}
98
99KFileMetaDataReader::KFileMetaDataReader(const QList<KUrl>& urls, QObject* parent) :
100 QObject(parent),
101 d(new Private(this))
102{
103 const QString fileMetaDataReaderExe = KStandardDirs::findExe(QLatin1String("kfilemetadatareader"));
104 (*d->m_process) << fileMetaDataReaderExe;
105
106 foreach (const KUrl& url, urls) {
107 (*d->m_process) << url.url();
108 }
109
110 d->m_process->setOutputChannelMode(KProcess::OnlyStdoutChannel);
111 d->m_process->setNextOpenMode(QIODevice::ReadOnly);
112 connect(d->m_process, SIGNAL(finished(int,QProcess::ExitStatus)),
113 this, SLOT(slotLoadingFinished(int,QProcess::ExitStatus)));
114}
115
116KFileMetaDataReader::~KFileMetaDataReader()
117{
118 delete d;
119}
120
121void KFileMetaDataReader::setReadContextData(bool read)
122{
123 d->m_readContextData = read;
124}
125
126bool KFileMetaDataReader::readContextData() const
127{
128 return d->m_readContextData;
129}
130
131void KFileMetaDataReader::start()
132{
133 if (d->m_process->state() == QProcess::NotRunning) {
134 if (!d->m_readContextData) {
135 (*d->m_process) << "--file";
136 }
137 d->m_process->start();
138 }
139}
140
141QHash<KUrl, Nepomuk::Variant> KFileMetaDataReader::metaData() const
142{
143 return d->m_metaData;
144}
145
146#include "kfilemetadatareader_p.moc"
KFileMetaDataReader
Provides metadata extracted from files.
Definition: kfilemetadatareader_p.h:44
KFileMetaDataReader::finished
void finished()
Is emitted if the reading of the metadata inside a custom process has been finished.
KFileMetaDataReader::metaData
QHash< KUrl, Nepomuk::Variant > metaData() const
Definition: kfilemetadatareader.cpp:141
KFileMetaDataReader::readContextData
bool readContextData() const
Definition: kfilemetadatareader.cpp:126
KFileMetaDataReader::setReadContextData
void setReadContextData(bool read)
If read is set to true also metadata that is persisted outside the files itself (like e....
Definition: kfilemetadatareader.cpp:121
KFileMetaDataReader::~KFileMetaDataReader
virtual ~KFileMetaDataReader()
Definition: kfilemetadatareader.cpp:116
KFileMetaDataReader::KFileMetaDataReader
KFileMetaDataReader(const QList< KUrl > &urls, QObject *parent=0)
Definition: kfilemetadatareader.cpp:99
KFileMetaDataReader::start
void start()
Starts the reading of the metadata inside a custom process.
Definition: kfilemetadatareader.cpp:131
KProcess
KProcess::OnlyStdoutChannel
OnlyStdoutChannel
KStandardDirs::findExe
static QString findExe(const QString &appname, const QString &pathstr=QString(), SearchOptions options=NoSearchOptions)
KUrl
KUrl::url
QString url(AdjustPathOption trailing=LeaveTrailingSlash) const
QHash
QList
QObject
kfilemetadatareader_p.h
kprocess.h
kstandarddirs.h
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