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#include "scannerpluginmanager.h"

#include <logging/logger.h>
#include <logging/translator.h>
#include <tools/hostosinfo.h>

#include <QCoreApplication>
#include <QDirIterator>
#include <QLibrary>

namespace qbs {
namespace Internal {

ScannerPluginManager::~ScannerPluginManager()
{
    foreach (QLibrary * const lib, m_libs) {
        lib->unload();
        delete lib;
    }
}

ScannerPluginManager *ScannerPluginManager::instance()
{
    static ScannerPluginManager scannerPlugin;
    return &scannerPlugin;
}

ScannerPluginManager::ScannerPluginManager()
{
}

QList<ScannerPlugin *> ScannerPluginManager::scannersForFileTag(const FileTag &fileTag)
{
    return instance()->m_scannerPlugins.value(fileTag);
}

void ScannerPluginManager::loadPlugins(const QStringList &pluginPaths, const Logger &logger)
{
    QStringList filters;

    if (HostOsInfo::isWindowsHost())
        filters << QLatin1String("*.dll");
    else if (HostOsInfo::isOsxHost())
        filters << QLatin1String("*.dylib");
    else
        filters << QLatin1String("*.so");

    foreach (const QString &pluginPath, pluginPaths) {
        logger.qbsTrace() << QString::fromLocal8Bit("pluginmanager: loading plugins from '%1'.")
                             .arg(QDir::toNativeSeparators(pluginPath));
        QDirIterator it(pluginPath, filters, QDir::Files);
        while (it.hasNext()) {
            const QString fileName = it.next();
            QScopedPointer<QLibrary> lib(new QLibrary(fileName));
            if (!lib->load()) {
                logger.qbsWarning() << Tr::tr("Pluginmanager: Cannot load plugin '%1': %2")
                                       .arg(QDir::toNativeSeparators(fileName), lib->errorString());
                continue;
            }

            getScanners_f getScanners = reinterpret_cast<getScanners_f>(lib->resolve("getScanners"));
            if (!getScanners) {
                logger.qbsWarning() << Tr::tr("Pluginmanager: Cannot resolve "
                        "symbol in '%1'.").arg(QDir::toNativeSeparators(fileName));
                continue;
            }

            ScannerPlugin **plugins = getScanners();
            if (plugins == 0) {
                logger.qbsWarning() << Tr::tr("pluginmanager: no scanners "
                        "returned from '%1'.").arg(QDir::toNativeSeparators(fileName));
                continue;
            }

            logger.qbsTrace() << QString::fromLocal8Bit("pluginmanager: scanner plugin '%1' "
                    "loaded.").arg(QDir::toNativeSeparators(fileName));

            for (int i = 0; plugins[i] != 0; ++i)
                m_scannerPlugins[FileTag(plugins[i]->fileTag)] += plugins[i];
            m_libs.append(lib.take());
        }
    }
}

} // namespace Internal
} // namespace qbs
