source: trunk/src/gui/dialogs/qfileinfogatherer.cpp@ 605

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**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: Nokia Corporation ([email protected])
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** This file is part of the QtGui module of the Qt Toolkit.
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** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
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#include "qfileinfogatherer_p.h"
#include <qdebug.h>
#include <qfsfileengine.h>
#include <qdiriterator.h>
#ifndef Q_OS_WIN
#  include <unistd.h>
#  include <sys/types.h>
#endif
#if defined(Q_OS_VXWORKS)
#  include "qplatformdefs.h"
#endif

QT_BEGIN_NAMESPACE

#ifndef QT_NO_FILESYSTEMMODEL

bool QFileInfoGatherer::fetchedRoot = false;

/*!
    Creates thread
*/
QFileInfoGatherer::QFileInfoGatherer(QObject *parent)
    : QThread(parent), abort(false),
#ifndef QT_NO_FILESYSTEMWATCHER
      watcher(0),
#endif
      m_resolveSymlinks(false), m_iconProvider(&defaultProvider)
{
#ifndef Q_OS_WIN
    userId = getuid();
    groupId = getgid();
#else
    m_resolveSymlinks = true;
#endif
#ifndef QT_NO_FILESYSTEMWATCHER
    watcher = new QFileSystemWatcher(this);
    connect(watcher, SIGNAL(directoryChanged(QString)), this, SLOT(list(QString)));
    connect(watcher, SIGNAL(fileChanged(QString)), this, SLOT(updateFile(QString)));
#endif
    start(LowPriority);
}

/*!
    Destroys thread
*/
QFileInfoGatherer::~QFileInfoGatherer()
{
    QMutexLocker locker(&mutex);
    abort = true;
    condition.wakeOne();
    locker.unlock();
    wait();
}

void QFileInfoGatherer::setResolveSymlinks(bool enable)
{
    Q_UNUSED(enable);
#ifdef Q_OS_WIN
    QMutexLocker locker(&mutex);
    m_resolveSymlinks = enable;
#endif
}

bool QFileInfoGatherer::resolveSymlinks() const
{
    return m_resolveSymlinks;
}

void QFileInfoGatherer::setIconProvider(QFileIconProvider *provider)
{
    QMutexLocker locker(&mutex);
    m_iconProvider = provider;
}

QFileIconProvider *QFileInfoGatherer::iconProvider() const
{
    return m_iconProvider;
}

/*!
    Fetch extended information for all \a files in \a path

    \sa updateFile(), update(), resolvedName()
*/
void QFileInfoGatherer::fetchExtendedInformation(const QString &path, const QStringList &files)
{
    QMutexLocker locker(&mutex);
    // See if we already have this dir/file in our que
    int loc = this->path.lastIndexOf(path);
    while (loc > 0)  {
        if (this->files.at(loc) == files) {
            return;
        }
        loc = this->path.lastIndexOf(path, loc - 1);
    }
    this->path.push(path);
    this->files.push(files);
    condition.wakeAll();
}

/*!
    Fetch extended information for all \a filePath

    \sa fetchExtendedInformation()
*/
void QFileInfoGatherer::updateFile(const QString &filePath)
{
    QString dir = filePath.mid(0, filePath.lastIndexOf(QDir::separator()));
    QString fileName = filePath.mid(dir.length() + 1);
    fetchExtendedInformation(dir, QStringList(fileName));
}

/*
    List all files in \a directoryPath

    \sa listed()
*/
void QFileInfoGatherer::clear()
{
#ifndef QT_NO_FILESYSTEMWATCHER
    QMutexLocker locker(&mutex);
    watcher->removePaths(watcher->files());
    watcher->removePaths(watcher->directories());
#endif
}

/*
    Remove a \a path from the watcher

    \sa listed()
*/
void QFileInfoGatherer::removePath(const QString &path)
{
#ifndef QT_NO_FILESYSTEMWATCHER
    QMutexLocker locker(&mutex);
    watcher->removePath(path);
#endif
}

/*
    List all files in \a directoryPath

    \sa listed()
*/
void QFileInfoGatherer::list(const QString &directoryPath)
{
    fetchExtendedInformation(directoryPath, QStringList());
}

/*
    Until aborted wait to fetch a directory or files
*/
void QFileInfoGatherer::run()
{
    forever {
        bool updateFiles = false;
        QMutexLocker locker(&mutex);
        if (abort) {
            return;
        }
        if (this->path.isEmpty())
            condition.wait(&mutex);
        QString path;
        QStringList list;
        if (!this->path.isEmpty()) {
            path = this->path.first();
            list = this->files.first();
            this->path.pop_front();
            this->files.pop_front();
            updateFiles = true;
        }
        locker.unlock();
        if (updateFiles)
            getFileInfos(path, list);
    }
}

/*
    QFileInfo::permissions is different depending upon your platform.