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#include "cpplocatordata.h"

using namespace CppTools;
using namespace CppTools::Internal;

static const int MaxPendingDocuments = 10;

CppLocatorData::CppLocatorData(CppModelManager *modelManager)
    : m_modelManager(modelManager)
    , m_pendingDocumentsMutex(QMutex::Recursive)
{
    m_search.setSymbolsToSearchFor(SymbolSearcher::Enums
                                 | SymbolSearcher::Classes
                                 | SymbolSearcher::Functions);
    m_pendingDocuments.reserve(MaxPendingDocuments);

    connect(m_modelManager, SIGNAL(documentUpdated(CPlusPlus::Document::Ptr)),
            this, SLOT(onDocumentUpdated(CPlusPlus::Document::Ptr)));

    connect(m_modelManager, SIGNAL(aboutToRemoveFiles(QStringList)),
            this, SLOT(onAboutToRemoveFiles(QStringList)));
}

QList<ModelItemInfo> CppLocatorData::enums()
{
    flushPendingDocument(true);
    return allModelItemInfos(m_allEnums);
}

QList<ModelItemInfo> CppLocatorData::classes()
{
    flushPendingDocument(true);
    return allModelItemInfos(m_allClasses);
}

QList<ModelItemInfo> CppLocatorData::functions()
{
    flushPendingDocument(true);
    return allModelItemInfos(m_allFunctions);
}

void CppLocatorData::onDocumentUpdated(const CPlusPlus::Document::Ptr &document)
{
    QMutexLocker locker(&m_pendingDocumentsMutex);

    int i = 0, ei = m_pendingDocuments.size();
    for (; i < ei; ++i) {
        const CPlusPlus::Document::Ptr &doc = m_pendingDocuments.at(i);
        if (doc->fileName() == document->fileName()
                && doc->revision() < document->revision()) {
            m_pendingDocuments[i] = document;
            break;
        }
    }

    if (i == ei)
        m_pendingDocuments.append(document);

    flushPendingDocument(false);
}

void CppLocatorData::onAboutToRemoveFiles(const QStringList &files)
{
    QMutexLocker locker(&m_pendingDocumentsMutex);

    for (int i = 0; i < m_pendingDocuments.size(); ) {
        if (files.contains(m_pendingDocuments.at(i)->fileName()))
            m_pendingDocuments.remove(i);
        else
            ++i;
    }

    foreach (const QString &file, files) {
        m_allEnums.remove(file);
        m_allClasses.remove(file);
        m_allFunctions.remove(file);
        removeFilePath(file);
    }
}

void CppLocatorData::flushPendingDocument(bool force)
{
    QMutexLocker locker(&m_pendingDocumentsMutex);
    if (!force && m_pendingDocuments.size() < MaxPendingDocuments)
        return;

    foreach (CPlusPlus::Document::Ptr doc, m_pendingDocuments) {
        const QString fileName = findOrInsertFilePath(doc->fileName());

        QList<ModelItemInfo> resultsEnums;
        QList<ModelItemInfo> resultsClasses;
        QList<ModelItemInfo> resultsFunctions;

        const int sizeHint = m_allEnums[fileName].size() + m_allClasses[fileName].size()
                + m_allFunctions[fileName].size() + 10;
        const QList<ModelItemInfo> results = m_search(doc, sizeHint);
        foreach (const ModelItemInfo &info, results) {
            switch (info.type) {
            case ModelItemInfo::Enum:
                resultsEnums.append(info);
                break;
            case ModelItemInfo::Class:
                resultsClasses.append(info);
                break;
            case ModelItemInfo::Function:
                resultsFunctions.append(info);
                break;
            default:
                break;
            }
        }

        m_allEnums[fileName] = resultsEnums;
        m_allClasses[fileName] = resultsClasses;
        m_allFunctions[fileName] = resultsFunctions;
    }

    m_pendingDocuments.clear();
    m_pendingDocuments.reserve(MaxPendingDocuments);
}

QList<ModelItemInfo> CppLocatorData::allModelItemInfos(const QHash<QString,
                                                       QList<ModelItemInfo> > &items) const
{
    QList<ModelItemInfo> result;
    QHashIterator<QString, QList<ModelItemInfo> > it(items);
    while (it.hasNext()) {
        it.next();
        result.append(it.value());
    }
    return result;
}
