qfileinfo.cpp

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#include "qplatformdefs.h"
#include "qfileinfo.h"
#include "qglobal.h"
#include "qdir.h"
#include "qfileinfo_p.h"

QT_BEGIN_NAMESPACE

QString QFileInfoPrivate::getFileName(QAbstractFileEngine::FileName name) const
{
    if (cache_enabled && !fileNames[(int)name].isNull())
        return fileNames[(int)name];

    QString ret;
    if (fileEngine == 0) { // local file; use the QFileSystemEngine directly
        switch (name) {
            case QAbstractFileEngine::CanonicalName:
            case QAbstractFileEngine::CanonicalPathName: {
                QFileSystemEntry entry = QFileSystemEngine::canonicalName(fileEntry, metaData);
                if (cache_enabled) { // be smart and store both
                    fileNames[QAbstractFileEngine::CanonicalName] = entry.filePath();
                    fileNames[QAbstractFileEngine::CanonicalPathName] = entry.path();
                }
                if (name == QAbstractFileEngine::CanonicalName)
                    ret = entry.filePath();
                else
                    ret = entry.path();
                break;
            }
            case QAbstractFileEngine::LinkName:
                ret = QFileSystemEngine::getLinkTarget(fileEntry, metaData).filePath();
                break;
            case QAbstractFileEngine::BundleName:
                ret = QFileSystemEngine::bundleName(fileEntry);
                break;
            case QAbstractFileEngine::AbsoluteName:
            case QAbstractFileEngine::AbsolutePathName: {
                QFileSystemEntry entry = QFileSystemEngine::absoluteName(fileEntry);
                if (cache_enabled) { // be smart and store both
                    fileNames[QAbstractFileEngine::AbsoluteName] = entry.filePath();
                    fileNames[QAbstractFileEngine::AbsolutePathName] = entry.path();
                }
                if (name == QAbstractFileEngine::AbsoluteName)
                    ret = entry.filePath();
                else
                    ret = entry.path();
                break;
            }
            default: break;
        }
    } else {
        ret = fileEngine->fileName(name);
    }
    if (ret.isNull())
        ret = QLatin1String("");
    if (cache_enabled)
        fileNames[(int)name] = ret;
    return ret;
}

QString QFileInfoPrivate::getFileOwner(QAbstractFileEngine::FileOwner own) const
{
    if (cache_enabled && !fileOwners[(int)own].isNull())
        return fileOwners[(int)own];
    QString ret;
    if (fileEngine == 0) {
        switch (own) {
        case QAbstractFileEngine::OwnerUser:
            ret = QFileSystemEngine::resolveUserName(fileEntry, metaData);
            break;
        case QAbstractFileEngine::OwnerGroup:
            ret = QFileSystemEngine::resolveGroupName(fileEntry, metaData);
            break;
        }
     } else {
        ret = fileEngine->owner(own);
    }
    if (ret.isNull())
        ret = QLatin1String("");
    if (cache_enabled)
        fileOwners[(int)own] = ret;
    return ret;
}

uint QFileInfoPrivate::getFileFlags(QAbstractFileEngine::FileFlags request) const
{
    Q_ASSERT(fileEngine); // should never be called when using the native FS
    // We split the testing into tests for for LinkType, BundleType, PermsMask
    // and the rest.
    // Tests for file permissions on Windows can be slow, expecially on network
    // paths and NTFS drives.
    // In order to determine if a file is a symlink or not, we have to lstat().
    // If we're not interested in that information, we might as well avoid one
    // extra syscall. Bundle detecton on Mac can be slow, expecially on network
    // paths, so we separate out that as well.

    QAbstractFileEngine::FileFlags req = 0;
    uint cachedFlags = 0;

    if (request & (QAbstractFileEngine::FlagsMask | QAbstractFileEngine::TypesMask)) {
        if (!getCachedFlag(CachedFileFlags)) {
            req |= QAbstractFileEngine::FlagsMask;
            req |= QAbstractFileEngine::TypesMask;
            req &= (~QAbstractFileEngine::LinkType);
            req &= (~QAbstractFileEngine::BundleType);

            cachedFlags |= CachedFileFlags;
        }

        if (request & QAbstractFileEngine::LinkType) {
            if (!getCachedFlag(CachedLinkTypeFlag)) {
                req |= QAbstractFileEngine::LinkType;
                cachedFlags |= CachedLinkTypeFlag;
            }
        }

        if (request & QAbstractFileEngine::BundleType) {
            if (!getCachedFlag(CachedBundleTypeFlag)) {
                req |= QAbstractFileEngine::BundleType;
                cachedFlags |= CachedBundleTypeFlag;
            }
        }
    }

    if (request & QAbstractFileEngine::PermsMask) {
        if (!getCachedFlag(CachedPerms)) {
            req |= QAbstractFileEngine::PermsMask;
            cachedFlags |= CachedPerms;
        }
    }

    if (req) {
        if (cache_enabled)
            req &= (~QAbstractFileEngine::Refresh);
        else
            req |= QAbstractFileEngine::Refresh;

        QAbstractFileEngine::FileFlags flags = fileEngine->fileFlags(req);
        fileFlags |= uint(flags);
        setCachedFlag(cachedFlags);
    }

    return fileFlags & request;
}

QDateTime &QFileInfoPrivate::getFileTime(QAbstractFileEngine::FileTime request) const
{
    Q_ASSERT(fileEngine); // should never be called when using the native FS
    if (!cache_enabled)
        clearFlags();
    uint cf;
    if (request == QAbstractFileEngine::CreationTime)
        cf = CachedCTime;
    else if (request == QAbstractFileEngine::ModificationTime)
        cf = CachedMTime;
    else
        cf = CachedATime;
    if (!getCachedFlag(cf)) {
        fileTimes[request] = fileEngine->fileTime(request);
        setCachedFlag(cf);
    }
    return fileTimes[request];
}

//************* QFileInfo

QFileInfo::QFileInfo(QFileInfoPrivate *p) : d_ptr(p)
{
}

QFileInfo::QFileInfo() : d_ptr(new QFileInfoPrivate())
{
}

QFileInfo::QFileInfo(const QString &file) : d_ptr(new QFileInfoPrivate(file))
{
}

QFileInfo::QFileInfo(const QFile &file) : d_ptr(new QFileInfoPrivate(file.fileName()))
{
}

QFileInfo::QFileInfo(const QDir &dir, const QString &file)
    : d_ptr(new QFileInfoPrivate(dir.filePath(file)))
{
}

QFileInfo::QFileInfo(const QFileInfo &fileinfo)
    : d_ptr(fileinfo.d_ptr)
{

}

QFileInfo::~QFileInfo()
{
}

bool QFileInfo::operator==(const QFileInfo &fileinfo) const
{
    Q_D(const QFileInfo);
    // ### Qt 5: understand long and short file names on Windows
    // ### (GetFullPathName()).
    if (fileinfo.d_ptr == d_ptr)
        return true;
    if (d->isDefaultConstructed || fileinfo.d_ptr->isDefaultConstructed)
        return false;

    // Assume files are the same if path is the same
    if (d->fileEntry.filePath() == fileinfo.d_ptr->fileEntry.filePath())
        return true;

    Qt::CaseSensitivity sensitive;
    if (d->fileEngine == 0 || fileinfo.d_ptr->fileEngine == 0) {
        if (d->fileEngine != fileinfo.d_ptr->fileEngine) // one is native, the other is a custom file-engine
            return false;

        sensitive = QFileSystemEngine::isCaseSensitive() ? Qt::CaseSensitive : Qt::CaseInsensitive;
    } else {
        if (d->fileEngine->caseSensitive() != fileinfo.d_ptr->fileEngine->caseSensitive())
            return false;
        sensitive = d->fileEngine->caseSensitive() ? Qt::CaseSensitive : Qt::CaseInsensitive;
    }

    if (fileinfo.size() != size()) //if the size isn't the same...
        return false;

   // Fallback to expensive canonical path computation
   return canonicalFilePath().compare(fileinfo.canonicalFilePath(), sensitive) == 0;
}

bool QFileInfo::operator==(const QFileInfo &fileinfo)
{
    return const_cast<const QFileInfo *>(this)->operator==(fileinfo);
}

QFileInfo &QFileInfo::operator=(const QFileInfo &fileinfo)
{
    d_ptr = fileinfo.d_ptr;
    return *this;
}

void QFileInfo::setFile(const QString &file)
{
    bool caching = d_ptr.constData()->cache_enabled;
    *this = QFileInfo(file);
    d_ptr->cache_enabled = caching;
}

void QFileInfo::setFile(const QFile &file)
{
    setFile(file.fileName());
}

void QFileInfo::setFile(const QDir &dir, const QString &file)
{
    setFile(dir.filePath(file));
}

QString QFileInfo::absoluteFilePath() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return QLatin1String("");
    return d->getFileName(QAbstractFileEngine::AbsoluteName);
}

QString QFileInfo::canonicalFilePath() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return QLatin1String("");
    return d->getFileName(QAbstractFileEngine::CanonicalName);
}


QString QFileInfo::absolutePath() const
{
    Q_D(const QFileInfo);

    if (d->isDefaultConstructed) {
        return QLatin1String("");
    } else if (d->fileEntry.isEmpty()) {
        qWarning("QFileInfo::absolutePath: Constructed with empty filename");
        return QLatin1String("");
    }
    return d->getFileName(QAbstractFileEngine::AbsolutePathName);
}

QString QFileInfo::canonicalPath() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return QLatin1String("");
    return d->getFileName(QAbstractFileEngine::CanonicalPathName);
}

QString QFileInfo::path() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return QLatin1String("");
    return d->fileEntry.path();
}

bool QFileInfo::isRelative() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return true;
    if (d->fileEngine == 0)
        return d->fileEntry.isRelative();
    return d->fileEngine->isRelativePath();
}

bool QFileInfo::makeAbsolute()
{
    if (d_ptr.constData()->isDefaultConstructed
            || !d_ptr.constData()->fileEntry.isRelative())
        return false;

    setFile(absoluteFilePath());
    return true;
}

bool QFileInfo::exists() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return false;
    if (d->fileEngine == 0) {
        if (!d->cache_enabled || !d->metaData.hasFlags(QFileSystemMetaData::ExistsAttribute))
            QFileSystemEngine::fillMetaData(d->fileEntry, d->metaData, QFileSystemMetaData::ExistsAttribute);
        return d->metaData.exists();
    }
    return d->getFileFlags(QAbstractFileEngine::ExistsFlag);
}

void QFileInfo::refresh()
{
    Q_D(QFileInfo);
    d->clear();
}

QString QFileInfo::filePath() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return QLatin1String("");
    return d->fileEntry.filePath();
}

QString QFileInfo::fileName() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return QLatin1String("");
    return d->fileEntry.fileName();
}

QString QFileInfo::bundleName() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return QLatin1String("");
    return d->getFileName(QAbstractFileEngine::BundleName);
}

QString QFileInfo::baseName() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return QLatin1String("");
    return d->fileEntry.baseName();
}

QString QFileInfo::completeBaseName() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return QLatin1String("");
    return d->fileEntry.completeBaseName();
}

QString QFileInfo::completeSuffix() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return QLatin1String("");
    return d->fileEntry.completeSuffix();
}

QString QFileInfo::suffix() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return QLatin1String("");
    return d->fileEntry.suffix();
}


QDir QFileInfo::dir() const
{
    Q_D(const QFileInfo);
    // ### Qt5: Maybe rename this to parentDirectory(), considering what it actually do?
    return QDir(d->fileEntry.path());
}

QDir QFileInfo::absoluteDir() const
{
    return QDir(absolutePath());
}

#ifdef QT3_SUPPORT

QDir QFileInfo::dir(bool absPath) const
{
    if (absPath)
        return absoluteDir();
    return dir();
}
#endif //QT3_SUPPORT

bool QFileInfo::isReadable() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return false;
    if (d->fileEngine == 0) {
        if (!d->cache_enabled || !d->metaData.hasFlags(QFileSystemMetaData::UserReadPermission))
            QFileSystemEngine::fillMetaData(d->fileEntry, d->metaData, QFileSystemMetaData::UserReadPermission);
        return (d->metaData.permissions() & QFile::ReadUser) != 0;
    }
    return d->getFileFlags(QAbstractFileEngine::ReadUserPerm);
}

bool QFileInfo::isWritable() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return false;
    if (d->fileEngine == 0) {
        if (!d->cache_enabled || !d->metaData.hasFlags(QFileSystemMetaData::UserWritePermission))
            QFileSystemEngine::fillMetaData(d->fileEntry, d->metaData, QFileSystemMetaData::UserWritePermission);
        return (d->metaData.permissions() & QFile::WriteUser) != 0;
    }
    return d->getFileFlags(QAbstractFileEngine::WriteUserPerm);
}

bool QFileInfo::isExecutable() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return false;
    if (d->fileEngine == 0) {
        if (!d->cache_enabled || !d->metaData.hasFlags(QFileSystemMetaData::UserExecutePermission))
            QFileSystemEngine::fillMetaData(d->fileEntry, d->metaData, QFileSystemMetaData::UserExecutePermission);
        return (d->metaData.permissions() & QFile::ExeUser) != 0;
    }
    return d->getFileFlags(QAbstractFileEngine::ExeUserPerm);
}

bool QFileInfo::isHidden() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return false;
    if (d->fileEngine == 0) {
        if (!d->cache_enabled || !d->metaData.hasFlags(QFileSystemMetaData::HiddenAttribute))
            QFileSystemEngine::fillMetaData(d->fileEntry, d->metaData, QFileSystemMetaData::HiddenAttribute);
        return d->metaData.isHidden();
    }
    return d->getFileFlags(QAbstractFileEngine::HiddenFlag);
}

bool QFileInfo::isFile() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return false;
    if (d->fileEngine == 0) {
        if (!d->cache_enabled || !d->metaData.hasFlags(QFileSystemMetaData::FileType))
            QFileSystemEngine::fillMetaData(d->fileEntry, d->metaData, QFileSystemMetaData::FileType);
        return d->metaData.isFile();
    }
    return d->getFileFlags(QAbstractFileEngine::FileType);
}

bool QFileInfo::isDir() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return false;
    if (d->fileEngine == 0) {
        if (!d->cache_enabled || !d->metaData.hasFlags(QFileSystemMetaData::DirectoryType))
            QFileSystemEngine::fillMetaData(d->fileEntry, d->metaData, QFileSystemMetaData::DirectoryType);
        return d->metaData.isDirectory();
    }
    return d->getFileFlags(QAbstractFileEngine::DirectoryType);
}


bool QFileInfo::isBundle() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return false;
    if (d->fileEngine == 0) {
        if (!d->cache_enabled || !d->metaData.hasFlags(QFileSystemMetaData::BundleType))
            QFileSystemEngine::fillMetaData(d->fileEntry, d->metaData, QFileSystemMetaData::BundleType);
        return d->metaData.isBundle();
    }
    return d->getFileFlags(QAbstractFileEngine::BundleType);
}

bool QFileInfo::isSymLink() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return false;
    if (d->fileEngine == 0) {
        if (!d->cache_enabled || !d->metaData.hasFlags(QFileSystemMetaData::LegacyLinkType))
            QFileSystemEngine::fillMetaData(d->fileEntry, d->metaData, QFileSystemMetaData::LegacyLinkType);
        return d->metaData.isLegacyLink();
    }
    return d->getFileFlags(QAbstractFileEngine::LinkType);
}

bool QFileInfo::isRoot() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return true;
    if (d->fileEngine == 0) {
        if (d->fileEntry.isRoot()) {
#if defined(Q_OS_WIN) || defined(Q_OS_SYMBIAN) 
            //the path is a drive root, but the drive may not exist
            //for backward compatibility, return true only if the drive exists
            if (!d->cache_enabled || !d->metaData.hasFlags(QFileSystemMetaData::ExistsAttribute))
                QFileSystemEngine::fillMetaData(d->fileEntry, d->metaData, QFileSystemMetaData::ExistsAttribute);
            return d->metaData.exists();
#else
            return true;
#endif
        }
        return false;
    }
    return d->getFileFlags(QAbstractFileEngine::RootFlag);
}

QString QFileInfo::readLink() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return QLatin1String("");
    return d->getFileName(QAbstractFileEngine::LinkName);
}

QString QFileInfo::owner() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return QLatin1String("");
    return d->getFileOwner(QAbstractFileEngine::OwnerUser);
}

uint QFileInfo::ownerId() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return 0;
    if (d->fileEngine == 0) {
        if (!d->cache_enabled || !d->metaData.hasFlags(QFileSystemMetaData::UserId))
            QFileSystemEngine::fillMetaData(d->fileEntry, d->metaData, QFileSystemMetaData::UserId);
        return d->metaData.userId();
    }
    return d->fileEngine->ownerId(QAbstractFileEngine::OwnerUser);
}

QString QFileInfo::group() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return QLatin1String("");
    return d->getFileOwner(QAbstractFileEngine::OwnerGroup);
}

uint QFileInfo::groupId() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return 0;
    if (d->fileEngine == 0) {
        if (!d->cache_enabled || !d->metaData.hasFlags(QFileSystemMetaData::GroupId))
            QFileSystemEngine::fillMetaData(d->fileEntry, d->metaData, QFileSystemMetaData::GroupId);
        return d->metaData.groupId();
    }
    return d->fileEngine->ownerId(QAbstractFileEngine::OwnerGroup);
}

bool QFileInfo::permission(QFile::Permissions permissions) const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return false;
    if (d->fileEngine == 0) {
        // the QFileSystemMetaData::MetaDataFlag and QFile::Permissions overlap, so just static cast.
        QFileSystemMetaData::MetaDataFlag permissionFlags = static_cast<QFileSystemMetaData::MetaDataFlag>((int)permissions);
        if (!d->cache_enabled || !d->metaData.hasFlags(permissionFlags))
            QFileSystemEngine::fillMetaData(d->fileEntry, d->metaData, permissionFlags);
        return (d->metaData.permissions() & permissions) == permissions;
    }
    return d->getFileFlags(QAbstractFileEngine::FileFlags((int)permissions)) == (uint)permissions;
}

QFile::Permissions QFileInfo::permissions() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return 0;
    if (d->fileEngine == 0) {
        if (!d->cache_enabled || !d->metaData.hasFlags(QFileSystemMetaData::Permissions))
            QFileSystemEngine::fillMetaData(d->fileEntry, d->metaData, QFileSystemMetaData::Permissions);
        return d->metaData.permissions();
    }
    return QFile::Permissions(d->getFileFlags(QAbstractFileEngine::PermsMask) & QAbstractFileEngine::PermsMask);
}


qint64 QFileInfo::size() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return 0;
    if (d->fileEngine == 0) {
        if (!d->cache_enabled || !d->metaData.hasFlags(QFileSystemMetaData::SizeAttribute))
            QFileSystemEngine::fillMetaData(d->fileEntry, d->metaData, QFileSystemMetaData::SizeAttribute);
        return d->metaData.size();
    }
    if (!d->getCachedFlag(QFileInfoPrivate::CachedSize)) {
        d->setCachedFlag(QFileInfoPrivate::CachedSize);
        d->fileSize = d->fileEngine->size();
    }
    return d->fileSize;
}

QDateTime QFileInfo::created() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return QDateTime();
    if (d->fileEngine == 0) {
        if (!d->cache_enabled || !d->metaData.hasFlags(QFileSystemMetaData::CreationTime))
            QFileSystemEngine::fillMetaData(d->fileEntry, d->metaData, QFileSystemMetaData::CreationTime);
        return d->metaData.creationTime();
    }
    return d->getFileTime(QAbstractFileEngine::CreationTime);
}

QDateTime QFileInfo::lastModified() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return QDateTime();
    if (d->fileEngine == 0) {
        if (!d->cache_enabled || !d->metaData.hasFlags(QFileSystemMetaData::ModificationTime))
            QFileSystemEngine::fillMetaData(d->fileEntry, d->metaData, QFileSystemMetaData::ModificationTime);
        return d->metaData.modificationTime();
    }
    return d->getFileTime(QAbstractFileEngine::ModificationTime);
}

QDateTime QFileInfo::lastRead() const
{
    Q_D(const QFileInfo);
    if (d->isDefaultConstructed)
        return QDateTime();
    if (d->fileEngine == 0) {
        if (!d->cache_enabled || !d->metaData.hasFlags(QFileSystemMetaData::AccessTime))
            QFileSystemEngine::fillMetaData(d->fileEntry, d->metaData, QFileSystemMetaData::AccessTime);
        return d->metaData.accessTime();
    }
    return d->getFileTime(QAbstractFileEngine::AccessTime);
}

void QFileInfo::detach()
{
    d_ptr.detach();
}

bool QFileInfo::caching() const
{
    Q_D(const QFileInfo);
    return d->cache_enabled;
}

void QFileInfo::setCaching(bool enable)
{
    Q_D(QFileInfo);
    d->cache_enabled = enable;
}

QT_END_NAMESPACE