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/***************************************************************************
copyright : (C) 2008 by Robby Stephenson
email : robby@periapsis.org
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of version 2 of the GNU General Public License as *
* published by the Free Software Foundation; *
* *
***************************************************************************/
#include "googlescholarfetcher.h"
#include "messagehandler.h"
#include "../filehandler.h"
#include "../translators/bibteximporter.h"
#include "../collection.h"
#include "../entry.h"
#include "../tellico_kernel.h"
#include "../tellico_debug.h"
#include <klocale.h>
#include <kconfig.h>
#include <kio/job.h>
#include <qlabel.h>
#include <qlayout.h>
namespace {
static const int GOOGLE_MAX_RETURNS_TOTAL = 20;
static const char* SCHOLAR_BASE_URL = "http://scholar.google.com/scholar";
}
using Tellico::Fetch::GoogleScholarFetcher;
GoogleScholarFetcher::GoogleScholarFetcher(QObject* parent_, const char* name_)
: Fetcher(parent_, name_),
m_limit(GOOGLE_MAX_RETURNS_TOTAL), m_start(0), m_job(0), m_started(false),
m_cookieIsSet(false) {
m_bibtexRx = QRegExp(QString::fromLatin1("<a\\s.*href\\s*=\\s*\"([^>]*scholar\\.bib[^>]*)\""));
m_bibtexRx.setMinimal(true);
}
GoogleScholarFetcher::~GoogleScholarFetcher() {
}
QString GoogleScholarFetcher::defaultName() {
// no i18n
return QString::fromLatin1("Google Scholar");
}
QString GoogleScholarFetcher::source() const {
return m_name.isEmpty() ? defaultName() : m_name;
}
bool GoogleScholarFetcher::canFetch(int type) const {
return type == Data::Collection::Bibtex;
}
void GoogleScholarFetcher::readConfigHook(const KConfigGroup& config_) {
Q_UNUSED(config_);
}
void GoogleScholarFetcher::search(FetchKey key_, const QString& value_) {
if(!m_cookieIsSet) {
// have to set preferences to have bibtex output
FileHandler::readTextFile(QString::fromLatin1("http://scholar.google.com/scholar_setprefs?num=100&scis=yes&scisf=4&submit=Save+Preferences"), true);
m_cookieIsSet = true;
}
m_key = key_;
m_value = value_;
m_started = true;
m_start = 0;
m_total = -1;
doSearch();
}
void GoogleScholarFetcher::continueSearch() {
m_started = true;
doSearch();
}
void GoogleScholarFetcher::doSearch() {
// myDebug() << "GoogleScholarFetcher::search() - value = " << value_ << endl;
if(!canFetch(Kernel::self()->collectionType())) {
message(i18n("%1 does not allow searching for this collection type.").arg(source()), MessageHandler::Warning);
stop();
return;
}
KURL u(QString::fromLatin1(SCHOLAR_BASE_URL));
u.addQueryItem(QString::fromLatin1("start"), QString::number(m_start));
switch(m_key) {
case Title:
u.addQueryItem(QString::fromLatin1("q"), QString::fromLatin1("allintitle:%1").arg(m_value));
break;
case Keyword:
u.addQueryItem(QString::fromLatin1("q"), m_value);
break;
case Person:
u.addQueryItem(QString::fromLatin1("q"), QString::fromLatin1("author:%1").arg(m_value));
break;
default:
kdWarning() << "GoogleScholarFetcher::search() - key not recognized: " << m_key << endl;
stop();
return;
}
// myDebug() << "GoogleScholarFetcher::search() - url: " << u.url() << endl;
m_job = KIO::get(u, false, false);
connect(m_job, SIGNAL(data(KIO::Job*, const QByteArray&)),
SLOT(slotData(KIO::Job*, const QByteArray&)));
connect(m_job, SIGNAL(result(KIO::Job*)),
SLOT(slotComplete(KIO::Job*)));
}
void GoogleScholarFetcher::stop() {
if(!m_started) {
return;
}
if(m_job) {
m_job->kill();
m_job = 0;
}
m_data.truncate(0);
m_started = false;
emit signalDone(this);
}
void GoogleScholarFetcher::slotData(KIO::Job*, const QByteArray& data_) {
QDataStream stream(m_data, IO_WriteOnly | IO_Append);
stream.writeRawBytes(data_.data(), data_.size());
}
void GoogleScholarFetcher::slotComplete(KIO::Job* job_) {
// myDebug() << "GoogleScholarFetcher::slotComplete()" << endl;
// since the fetch is done, don't worry about holding the job pointer
m_job = 0;
if(job_->error()) {
job_->showErrorDialog(Kernel::self()->widget());
stop();
return;
}
if(m_data.isEmpty()) {
myDebug() << "GoogleScholarFetcher::slotComplete() - no data" << endl;
stop();
return;
}
QString text = QString::fromUtf8(m_data, m_data.size());
QString bibtex;
int count = 0;
for(int pos = text.find(m_bibtexRx); count < m_limit && pos > -1; pos = text.find(m_bibtexRx, pos+m_bibtexRx.matchedLength()), ++count) {
KURL bibtexUrl(QString::fromLatin1(SCHOLAR_BASE_URL), m_bibtexRx.cap(1));
// myDebug() << bibtexUrl << endl;
bibtex += FileHandler::readTextFile(bibtexUrl, true);
}
Import::BibtexImporter imp(bibtex);
Data::CollPtr coll = imp.collection();
if(!coll) {
myDebug() << "GoogleScholarFetcher::slotComplete() - no collection pointer" << endl;
stop();
return;
}
count = 0;
Data::EntryVec entries = coll->entries();
for(Data::EntryVec::Iterator entry = entries.begin(); count < m_limit && entry != entries.end(); ++entry, ++count) {
if(!m_started) {
// might get aborted
break;
}
QString desc = entry->field(QString::fromLatin1("author"))
+ QChar('/') + entry->field(QString::fromLatin1("publisher"));
if(!entry->field(QString::fromLatin1("year")).isEmpty()) {
desc += QChar('/') + entry->field(QString::fromLatin1("year"));
}
SearchResult* r = new SearchResult(this, entry->title(), desc, entry->field(QString::fromLatin1("isbn")));
m_entries.insert(r->uid, Data::EntryPtr(entry));
emit signalResultFound(r);
}
m_start = m_entries.count();
// m_hasMoreResults = m_start <= m_total;
m_hasMoreResults = false; // for now, no continued searches
stop(); // required
}
Tellico::Data::EntryPtr GoogleScholarFetcher::fetchEntry(uint uid_) {
return m_entries[uid_];
}
void GoogleScholarFetcher::updateEntry(Data::EntryPtr entry_) {
// myDebug() << "GoogleScholarFetcher::updateEntry()" << endl;
// limit to top 5 results
m_limit = 5;
QString title = entry_->field(QString::fromLatin1("title"));
if(!title.isEmpty()) {
search(Title, title);
return;
}
myDebug() << "GoogleScholarFetcher::updateEntry() - insufficient info to search" << endl;
emit signalDone(this); // always need to emit this if not continuing with the search
}
Tellico::Fetch::ConfigWidget* GoogleScholarFetcher::configWidget(QWidget* parent_) const {
return new GoogleScholarFetcher::ConfigWidget(parent_, this);
}
GoogleScholarFetcher::ConfigWidget::ConfigWidget(QWidget* parent_, const GoogleScholarFetcher*/*=0*/)
: Fetch::ConfigWidget(parent_) {
QVBoxLayout* l = new QVBoxLayout(optionsWidget());
l->addWidget(new QLabel(i18n("This source has no options."), optionsWidget()));
l->addStretch();
}
QString GoogleScholarFetcher::ConfigWidget::preferredName() const {
return GoogleScholarFetcher::defaultName();
}
#include "googlescholarfetcher.moc"
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