OMRAS2 Classical Browser

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

#include "ComposerFileIndex.h"

#include "TypeRegistrar.h"

#include <QMutexLocker>

#include <QDir>

#include "base/TempDirectory.h"

#include "base/Exceptions.h"

using namespace Dataquay;

namespace ClassicalData {

ComposerFileIndex *

ComposerFileIndex::getInstance()

{

    static ComposerFileIndex instance;

    return &instance;

}

ComposerFileIndex::ComposerFileIndex() :

    m_bs(0),

    m_index(0)

{

    try {

        m_indexFileName = getIndexFileName();

    } catch (DirectoryCreationFailed f) {

        std::cerr << "ComposerFileIndex: ERROR: Failed to find or create index directory: " << f.what() << std::endl;

        return;

    }

    m_bs = new BasicStore;

    m_index = new TransactionalStore(m_bs);

    TypeRegistrar::addMappings(m_bs, 0);

    if (QFile(m_indexFileName).exists()) {

        m_bs->import(QUrl::fromLocalFile(m_indexFileName),

                     BasicStore::ImportIgnoreDuplicates);

        //!!! catch

    }

}

ComposerFileIndex::~ComposerFileIndex()

{

    delete m_index;

    delete m_bs;

}

QString

ComposerFileIndex::getIndexFileName()

{

    QDir d = TempDirectory::getInstance()->getContainingPath();

    QString n("index");

    QFileInfo fi(d.filePath(n));

    if ((fi.exists() && !fi.isDir()) ||

        (!fi.exists() && !d.mkdir(n))) {

        throw DirectoryCreationFailed(fi.filePath());

    }

    return QDir(fi.filePath()).filePath("composer-details.ttl");

}

QString

ComposerFileIndex::getComposerDirectoryName()

{

    QDir d = TempDirectory::getInstance()->getContainingPath();

    QString n("composers");

    QFileInfo fi(d.filePath(n));

    if ((fi.exists() && !fi.isDir()) ||

        (!fi.exists() && !d.mkdir(n))) {

        throw DirectoryCreationFailed(fi.filePath());

    }

    return fi.filePath();

}

void

ComposerFileIndex::loadFor(Uri composerUri, Store *store)

{

    if (!m_index) {

        std::cerr << "ComposerFileIndex::loadFor: No index!" << std::endl;

        return;

    }

    updateIndex();

    Triple pattern(Node(), "foaf:primaryTopic", composerUri);

    Triples results = m_index->match(pattern);

    std::cerr << "ComposerFileIndex::loadFor: " << results.size() << " file(s) for composer " << composerUri << std::endl;

    bool loadedSomething = false;

    foreach (Triple t, results) {

        try {

            BasicStore *b = BasicStore::load(QUrl(t.a.value));

            //!!! This is hardly the most efficient!

            Triples all = b->match(Triple());

            //!!! There is no Store::add(Triples)

            foreach (Triple t, all) {

                store->add(t);

            }

        } catch (...) { } //!!!???

    }

    return loadedSomething;

}

void

ComposerFileIndex::composerFileAdded(QString filepath)

{

    index(QUrl::fromLocalFile(filepath));

}    

void

ComposerFileIndex::updateIndex()

{

    QMutexLocker locker(&m_mutex);

    if (!m_index) return;

    std::cerr << "Generating index..." << std::endl;

    QDir composerDir;

    try {

        QString s = getComposerDirectoryName();

        composerDir = QDir(s);

    } catch (DirectoryCreationFailed f) {

        std::cerr << "ComposerFileIndex::updateIndex: ERROR: Failed to find or create composer directory: " << f.what() << std::endl;

        return;

    }

    composerDir.setFilter(QDir::Files);

    for (unsigned int i = 0; i < composerDir.count(); ++i) {

        QFileInfo fi(composerDir.filePath(composerDir[i]));

        if (fi.isFile() && fi.isReadable()) {

            index(QUrl::fromLocalFile(fi.filePath()));

        }

    }

    //!!! remove triples from index that refer to nonexistent files?

    std::cerr << "Saving index to " << m_indexFileName.toStdString() << std::endl;

    m_bs->save(m_indexFileName);

    std::cerr << "Done" << std::endl;

}

void

ComposerFileIndex::index(QUrl fileUrl)

{

    Triple typeTriple(Uri(fileUrl), "a", m_index->expand("foaf:Document"));

    if (m_index->contains(typeTriple)) {

        return;

    }

    Transaction *tx = m_index->startTransaction();

    tx->add(typeTriple);

    try {

        BasicStore *b = BasicStore::load(fileUrl);

        Triples ts = b->match

            (Triple(Node(), "a", m_index->expand("classical:Composer")));

        foreach (Triple t, ts) {

            tx->add(Triple(Uri(fileUrl), "foaf:primaryTopic", t.a));;

        }

    } catch (std::exception &e) {

        std::cerr << "Caught exception: \"" << e.what() << "\" while indexing "

                  << Uri(fileUrl) << ", skipping" << std::endl;

    }

    tx->commit();

    delete tx;

}

}