/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
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** $QT_END_LICENSE$
**
****************************************************************************/

#include <QtQml/qqmlprivate.h>
#include "qqmlmetatype_p.h"

#include <private/qqmlproxymetaobject_p.h>
#include <private/qqmlcustomparser_p.h>
#include <private/qqmlguard_p.h>
#include <private/qhashedstring_p.h>
#include <private/qqmlimport_p.h>

#include <QtCore/qdebug.h>
#include <QtCore/qstringlist.h>
#include <QtCore/qmetaobject.h>
#include <QtCore/qbitarray.h>
#include <QtCore/qreadwritelock.h>
#include <QtCore/private/qmetaobject_p.h>

#include <qmetatype.h>
#include <qobjectdefs.h>
#include <qbytearray.h>
#include <qreadwritelock.h>
#include <qstring.h>
#include <qstringlist.h>
#include <qvector.h>

#include <ctype.h>

QT_BEGIN_NAMESPACE

struct QQmlMetaTypeData
{
    QQmlMetaTypeData();
    ~QQmlMetaTypeData();
    QList<QQmlType *> types;
    typedef QHash<int, QQmlType *> Ids;
    Ids idToType;
    typedef QHash<QHashedStringRef,QQmlType *> Names;
    Names nameToType;
    typedef QHash<QUrl, QQmlType *> Files; //For file imported composite types only
    Files urlToType;
    typedef QHash<const QMetaObject *, QQmlType *> MetaObjects;
    MetaObjects metaObjectToType;
    typedef QHash<int, QQmlMetaType::StringConverter> StringConverters;
    StringConverters stringConverters;

    struct VersionedUri {
        VersionedUri()
        : majorVersion(0) {}
        VersionedUri(const QHashedString &uri, int majorVersion)
        : uri(uri), majorVersion(majorVersion) {}
        bool operator==(const VersionedUri &other) const {
            return other.majorVersion == majorVersion && other.uri == uri;
        }
        QHashedString uri;
        int majorVersion;
    };
    typedef QHash<VersionedUri, QQmlTypeModule *> TypeModules;
    TypeModules uriToModule;

    QBitArray objects;
    QBitArray interfaces;
    QBitArray lists;

    QList<QQmlPrivate::AutoParentFunction> parentFunctions;

    QSet<QString> protectedNamespaces;

    QString typeRegistrationNamespace;
    QStringList typeRegistrationFailures;
};

class QQmlTypeModulePrivate
{
public:
    QQmlTypeModulePrivate() 
    : minMinorVersion(INT_MAX), maxMinorVersion(0) {}

    QQmlMetaTypeData::VersionedUri uri;

    int minMinorVersion;
    int maxMinorVersion;

    void add(QQmlType *);

    QStringHash<QList<QQmlType *> > typeHash;
    QList<QQmlType *> types;
};

Q_GLOBAL_STATIC(QQmlMetaTypeData, metaTypeData)
Q_GLOBAL_STATIC_WITH_ARGS(QReadWriteLock, metaTypeDataLock, (QReadWriteLock::Recursive))

static uint qHash(const QQmlMetaTypeData::VersionedUri &v)
{
    return v.uri.hash() ^ qHash(v.majorVersion);
}

QQmlMetaTypeData::QQmlMetaTypeData()
{
}

QQmlMetaTypeData::~QQmlMetaTypeData()
{
    for (int i = 0; i < types.count(); ++i)
        delete types.at(i);

    TypeModules::const_iterator i = uriToModule.constBegin();
    for (; i != uriToModule.constEnd(); ++i)
        delete *i;
}

class QQmlTypePrivate
{
public:
    QQmlTypePrivate(QQmlType::RegistrationType type);
    ~QQmlTypePrivate();

    void init() const;
    void initEnums() const;
    void insertEnums(const QMetaObject *metaObject) const;

    QQmlType::RegistrationType regType;

    struct QQmlCppTypeData
    {
        int allocationSize;
        void (*newFunc)(void *);
        QString noCreationReason;
        int parserStatusCast;
        QObject *(*extFunc)(QObject *);
        const QMetaObject *extMetaObject;
        QQmlCustomParser *customParser;
        QQmlAttachedPropertiesFunc attachedPropertiesFunc;
        const QMetaObject *attachedPropertiesType;
        int attachedPropertiesId;
        int propertyValueSourceCast;
        int propertyValueInterceptorCast;
    };

    struct QQmlSingletonTypeData
    {
        QQmlType::SingletonInstanceInfo *singletonInstanceInfo;
    };

    struct QQmlCompositeTypeData
    {
        QUrl url;
    };

    union extraData {
        QQmlCppTypeData* cd;
        QQmlSingletonTypeData* sd;
        QQmlCompositeTypeData* fd;
    } extraData;

    const char *iid;
    QHashedString module;
    QString name;
    QString elementName;
    int version_maj;
    int version_min;
    int typeId;
    int listId;
    int revision;
    mutable bool containsRevisionedAttributes;
    mutable QQmlType *superType;
    const QMetaObject *baseMetaObject;

    int index;
    mutable volatile bool isSetup:1;
    mutable volatile bool isEnumSetup:1;
    mutable bool haveSuperType:1;
    mutable QList<QQmlProxyMetaObject::ProxyData> metaObjects;
    mutable QStringHash<int> enums;

    static QHash<const QMetaObject *, int> attachedPropertyIds;
};

// Avoid multiple fromUtf8(), copies and hashing of the module name.
// This is only called when metaTypeDataLock is locked.
static QHashedString moduleFromUtf8(const char *module)
{
    if (!module)
        return QHashedString();

    static const char *lastModule = 0;
    static QHashedString lastModuleStr;

    // Separate plugins may have different strings at the same address
    QHashedCStringRef currentModule(module, ::strlen(module));
    if ((lastModule != module) || (lastModuleStr.hash() != currentModule.hash())) {
        lastModuleStr = QString::fromUtf8(module);
        lastModuleStr.hash();
        lastModule = module;
    }

    return lastModuleStr;
}

void QQmlType::SingletonInstanceInfo::init(QQmlEngine *e)
{
    if (scriptCallback && scriptApi(e).isUndefined()) {
        setScriptApi(e, scriptCallback(e, e));
    } else if (qobjectCallback && !qobjectApi(e)) {
        setQObjectApi(e, qobjectCallback(e, e));
    }
}

void QQmlType::SingletonInstanceInfo::destroy(QQmlEngine *e)
{
    // cleans up the engine-specific singleton instances if they exist.
    scriptApis.remove(e);
    QObject *o = qobjectApis.take(e);
    delete o;
}

void QQmlType::SingletonInstanceInfo::setQObjectApi(QQmlEngine *e, QObject *o)
{
    qobjectApis.insert(e, o);
}

QObject *QQmlType::SingletonInstanceInfo::qobjectApi(QQmlEngine *e) const
{
    return qobjectApis.value(e);
}

void QQmlType::SingletonInstanceInfo::setScriptApi(QQmlEngine *e, QJSValue v)
{
    scriptApis.insert(e, v);
}

QJSValue QQmlType::SingletonInstanceInfo::scriptApi(QQmlEngine *e) const
{
    return scriptApis.value(e);
}

QHash<const QMetaObject *, int> QQmlTypePrivate::attachedPropertyIds;

QQmlTypePrivate::QQmlTypePrivate(QQmlType::RegistrationType type)
: regType(type), iid(0), typeId(0), listId(0), revision(0),
    containsRevisionedAttributes(false), superType(0), baseMetaObject(0),
    index(-1), isSetup(false), isEnumSetup(false), haveSuperType(false)
{
    switch (type) {
    case QQmlType::CppType:
        extraData.cd = new QQmlCppTypeData;
        extraData.cd->allocationSize = 0;
        extraData.cd->newFunc = 0;
        extraData.cd->parserStatusCast = -1;
        extraData.cd->extFunc = 0;
        extraData.cd->extMetaObject = 0;
        extraData.cd->customParser = 0;
        extraData.cd->attachedPropertiesFunc = 0;
        extraData.cd->attachedPropertiesType = 0;
        extraData.cd->propertyValueSourceCast = -1;
        extraData.cd->propertyValueInterceptorCast = -1;
        break;
    case QQmlType::SingletonType:
        extraData.sd = new QQmlSingletonTypeData;
        extraData.sd->singletonInstanceInfo = 0;
        break;
    case QQmlType::InterfaceType:
        extraData.cd = 0;
        break;
    case QQmlType::CompositeType:
        extraData.fd = new QQmlCompositeTypeData;
        break;
    default: qFatal("QQmlTypePrivate Internal Error.");
    }
}

QQmlTypePrivate::~QQmlTypePrivate()
{
    switch (regType) {
    case QQmlType::CppType:
        delete extraData.cd->customParser;
        delete extraData.cd;
        break;
    case QQmlType::SingletonType:
        delete extraData.sd->singletonInstanceInfo;
        delete extraData.sd;
        break;
    case QQmlType::CompositeType:
        delete extraData.fd;
        break;
    default: //Also InterfaceType, because it has no extra data
        break;
    }
}

QQmlType::QQmlType(int index, const QQmlPrivate::RegisterInterface &interface)
: d(new QQmlTypePrivate(InterfaceType))
{
    d->iid = interface.iid;
    d->typeId = interface.typeId;
    d->listId = interface.listId;
    d->index = index;
    d->isSetup = true;
    d->version_maj = 0;
    d->version_min = 0;
}

QQmlType::QQmlType(int index, const QString &elementName, const QQmlPrivate::RegisterSingletonType &type)
: d(new QQmlTypePrivate(SingletonType))
{
    d->elementName = elementName;
    d->module = moduleFromUtf8(type.uri);

    d->version_maj = type.versionMajor;
    d->version_min = type.versionMinor;

    if (type.qobjectApi) {
        if (type.version >= 1) // static metaobject added in version 1
            d->baseMetaObject = type.instanceMetaObject;
        if (type.version >= 2) // typeId added in version 2
            d->typeId = type.typeId;
        if (type.version >= 2) // revisions added in version 2
            d->revision = type.revision;
    }

    d->index = index;

    d->extraData.sd->singletonInstanceInfo = new SingletonInstanceInfo;
    d->extraData.sd->singletonInstanceInfo->scriptCallback = type.scriptApi;
    d->extraData.sd->singletonInstanceInfo->qobjectCallback = type.qobjectApi;
    d->extraData.sd->singletonInstanceInfo->typeName = QString::fromUtf8(type.typeName);
    d->extraData.sd->singletonInstanceInfo->instanceMetaObject
        = (type.qobjectApi && type.version >= 1) ? type.instanceMetaObject : 0;
}

QQmlType::QQmlType(int index, const QString &elementName, const QQmlPrivate::RegisterType &type)
: d(new QQmlTypePrivate(CppType))
{
    d->elementName = elementName;
    d->module = moduleFromUtf8(type.uri);

    d->version_maj = type.versionMajor;
    d->version_min = type.versionMinor;
    if (type.version >= 1) // revisions added in version 1
        d->revision = type.revision;
    d->typeId = type.typeId;
    d->listId = type.listId;
    d->extraData.cd->allocationSize = type.objectSize;
    d->extraData.cd->newFunc = type.create;
    d->extraData.cd->noCreationReason = type.noCreationReason;
    d->baseMetaObject = type.metaObject;
    d->extraData.cd->attachedPropertiesFunc = type.attachedPropertiesFunction;
    d->extraData.cd->attachedPropertiesType = type.attachedPropertiesMetaObject;
    if (d->extraData.cd->attachedPropertiesType) {
        QHash<const QMetaObject *, int>::Iterator iter = d->attachedPropertyIds.find(d->baseMetaObject);
        if (iter == d->attachedPropertyIds.end())
            iter = d->attachedPropertyIds.insert(d->baseMetaObject, index);
        d->extraData.cd->attachedPropertiesId = *iter;
    } else {
        d->extraData.cd->attachedPropertiesId = -1;
    }
    d->extraData.cd->parserStatusCast = type.parserStatusCast;
    d->extraData.cd->propertyValueSourceCast = type.valueSourceCast;
    d->extraData.cd->propertyValueInterceptorCast = type.valueInterceptorCast;
    d->extraData.cd->extFunc = type.extensionObjectCreate;
    d->extraData.cd->customParser = type.customParser;
    d->index = index;

    if (type.extensionMetaObject)
        d->extraData.cd->extMetaObject = type.extensionMetaObject;
}

QQmlType::QQmlType(int index, const QString &elementName, const QQmlPrivate::RegisterCompositeType &type)
: d(new QQmlTypePrivate(CompositeType))
{
    d->index = index;
    d->elementName = elementName;

    d->module = moduleFromUtf8(type.uri);
    d->version_maj = type.versionMajor;
    d->version_min = type.versionMinor;

    d->extraData.fd->url = type.url;
}

QQmlType::~QQmlType()
{
    delete d;
}

const QHashedString &QQmlType::module() const
{
    return d->module;
}

int QQmlType::majorVersion() const
{
    return d->version_maj;
}

int QQmlType::minorVersion() const
{
    return d->version_min;
}

bool QQmlType::availableInVersion(int vmajor, int vminor) const
{
    Q_ASSERT(vmajor >= 0 && vminor >= 0);
    return vmajor == d->version_maj && vminor >= d->version_min;
}

bool QQmlType::availableInVersion(const QHashedStringRef &module, int vmajor, int vminor) const
{
    Q_ASSERT(vmajor >= 0 && vminor >= 0);
    return module == d->module && vmajor == d->version_maj && vminor >= d->version_min;
}

// returns the nearest _registered_ super class
QQmlType *QQmlType::superType() const
{
    if (!d->haveSuperType && d->baseMetaObject) {
        const QMetaObject *mo = d->baseMetaObject->superClass();
        while (mo && !d->superType) {
            d->superType = QQmlMetaType::qmlType(mo, d->module, d->version_maj, d->version_min);
            mo = mo->superClass();
        }
        d->haveSuperType = true;
    }

    return d->superType;
}

static void clone(QMetaObjectBuilder &builder, const QMetaObject *mo, 
                  const QMetaObject *ignoreStart, const QMetaObject *ignoreEnd)
{
    // Set classname
    builder.setClassName(ignoreEnd->className());

    // Clone Q_CLASSINFO
    for (int ii = mo->classInfoOffset(); ii < mo->classInfoCount(); ++ii) {
        QMetaClassInfo info = mo->classInfo(ii);

        int otherIndex = ignoreEnd->indexOfClassInfo(info.name());
        if (otherIndex >= ignoreStart->classInfoOffset() + ignoreStart->classInfoCount()) {
            // Skip 
        } else {
            builder.addClassInfo(info.name(), info.value());
        }
    }

    // Clone Q_PROPERTY
    for (int ii = mo->propertyOffset(); ii < mo->propertyCount(); ++ii) {
        QMetaProperty property = mo->property(ii);

        int otherIndex = ignoreEnd->indexOfProperty(property.name());
        if (otherIndex >= ignoreStart->propertyOffset() + ignoreStart->propertyCount()) {
            builder.addProperty(QByteArray("__qml_ignore__") + property.name(), QByteArray("void"));
            // Skip 
        } else {
            builder.addProperty(property);
        }
    }

    // Clone Q_METHODS
    for (int ii = mo->methodOffset(); ii < mo->methodCount(); ++ii) {
        QMetaMethod method = mo->method(ii);

        // More complex - need to search name
        QByteArray name = method.name();


        bool found = false;

        for (int ii = ignoreStart->methodOffset() + ignoreStart->methodCount(); 
             !found && ii < ignoreEnd->methodOffset() + ignoreEnd->methodCount();
             ++ii) {

            QMetaMethod other = ignoreEnd->method(ii);

            found = name == other.name();
        }

        QMetaMethodBuilder m = builder.addMethod(method);
        if (found) // SKIP
            m.setAccess(QMetaMethod::Private);
    }

    // Clone Q_ENUMS
    for (int ii = mo->enumeratorOffset(); ii < mo->enumeratorCount(); ++ii) {
        QMetaEnum enumerator = mo->enumerator(ii);

        int otherIndex = ignoreEnd->indexOfEnumerator(enumerator.name());
        if (otherIndex >= ignoreStart->enumeratorOffset() + ignoreStart->enumeratorCount()) {
            // Skip 
        } else {
            builder.addEnumerator(enumerator);
        }
    }
}

static bool isPropertyRevisioned(const QMetaObject *mo, int index)
{
    int i = index;
    i -= mo->propertyOffset();
    if (i < 0 && mo->d.superdata)
        return isPropertyRevisioned(mo->d.superdata, index);

    const QMetaObjectPrivate *mop = reinterpret_cast<const QMetaObjectPrivate*>(mo->d.data);
    if (i >= 0 && i < mop->propertyCount) {
        int handle = mop->propertyData + 3*i;
        int flags = mo->d.data[handle + 2];

        return (flags & Revisioned);
    }

    return false;
}

void QQmlTypePrivate::init() const
{
    if (isSetup)
        return;

    QWriteLocker lock(metaTypeDataLock());
    if (isSetup)
        return;

    const QMetaObject *mo = baseMetaObject;
    if (!mo) {
        // version 0 singleton type without metaobject information
        return;
    }

    if (regType == QQmlType::CppType) {
        // Setup extended meta object
        // XXX - very inefficient
        if (extraData.cd->extFunc) {
            QMetaObjectBuilder builder;
            clone(builder, extraData.cd->extMetaObject, extraData.cd->extMetaObject, extraData.cd->extMetaObject);
            builder.setFlags(QMetaObjectBuilder::DynamicMetaObject);
            QMetaObject *mmo = builder.toMetaObject();
            mmo->d.superdata = mo;
            QQmlProxyMetaObject::ProxyData data = { mmo, extraData.cd->extFunc, 0, 0 };
            metaObjects << data;
        }
    }

    mo = mo->d.superdata;
    while(mo) {
        QQmlType *t = metaTypeData()->metaObjectToType.value(mo);
        if (t) {
            if (t->d->regType == QQmlType::CppType) {
                if (t->d->extraData.cd->extFunc) {
                    QMetaObjectBuilder builder;
                    clone(builder, t->d->extraData.cd->extMetaObject, t->d->baseMetaObject, baseMetaObject);
                    builder.setFlags(QMetaObjectBuilder::DynamicMetaObject);
                    QMetaObject *mmo = builder.toMetaObject();
                    mmo->d.superdata = baseMetaObject;
                    if (!metaObjects.isEmpty())
                        metaObjects.last().metaObject->d.superdata = mmo;
                    QQmlProxyMetaObject::ProxyData data = { mmo, t->d->extraData.cd->extFunc, 0, 0 };
                    metaObjects << data;
                }
            }
        }
        mo = mo->d.superdata;
    }

    for (int ii = 0; ii < metaObjects.count(); ++ii) {
        metaObjects[ii].propertyOffset =
            metaObjects.at(ii).metaObject->propertyOffset();
        metaObjects[ii].methodOffset =
            metaObjects.at(ii).metaObject->methodOffset();
    }

    // Check for revisioned details
    {
        const QMetaObject *mo = 0;
        if (metaObjects.isEmpty())
            mo = baseMetaObject;
        else
            mo = metaObjects.first().metaObject;

        for (int ii = 0; !containsRevisionedAttributes && ii < mo->propertyCount(); ++ii) {
            if (isPropertyRevisioned(mo, ii))
                containsRevisionedAttributes = true;
        }

        for (int ii = 0; !containsRevisionedAttributes && ii < mo->methodCount(); ++ii) {
            if (mo->method(ii).revision() != 0)
                containsRevisionedAttributes = true;
        }
    }

    isSetup = true;
    lock.unlock();
}

void QQmlTypePrivate::initEnums() const
{
    if (isEnumSetup) return;

    init();

    QWriteLocker lock(metaTypeDataLock());
    if (isEnumSetup) return;

    if (baseMetaObject) // could be singleton type without metaobject
        insertEnums(baseMetaObject);

    isEnumSetup = true;
}

void QQmlTypePrivate::insertEnums(const QMetaObject *metaObject) const
{
    // Add any enum values defined by 'related' classes
    if (metaObject->d.relatedMetaObjects) {
        const QMetaObject **related = metaObject->d.relatedMetaObjects;
        if (related) {
            while (*related)
                insertEnums(*related++);
        }
    }

    // Add any enum values defined by this class, overwriting any inherited values
    for (int ii = 0; ii < metaObject->enumeratorCount(); ++ii) {
        QMetaEnum e = metaObject->enumerator(ii);
        for (int jj = 0; jj < e.keyCount(); ++jj)
            enums.insert(QString::fromUtf8(e.key(jj)), e.value(jj));
    }
}

QByteArray QQmlType::typeName() const
{
    if (d->regType == SingletonType)
        return d->extraData.sd->singletonInstanceInfo->typeName.toUtf8();
    else if (d->baseMetaObject)
        return d->baseMetaObject->className();
    else
        return QByteArray();
}

const QString &QQmlType::elementName() const
{
    return d->elementName;
}

const QString &QQmlType::qmlTypeName() const
{
    if (d->name.isEmpty()) {
        if (!d->module.isEmpty())
            d->name = static_cast<QString>(d->module) + QLatin1Char('/') + d->elementName;
        else
            d->name = d->elementName;
    }

    return d->name;
}

QObject *QQmlType::create() const
{
    if (!isCreatable())
        return 0;

    d->init();

    QObject *rv = (QObject *)operator new(d->extraData.cd->allocationSize);
    d->extraData.cd->newFunc(rv);

    if (rv && !d->metaObjects.isEmpty())
        (void)new QQmlProxyMetaObject(rv, &d->metaObjects);

    return rv;
}

void QQmlType::create(QObject **out, void **memory, size_t additionalMemory) const
{
    if (!isCreatable())
        return;

    d->init();

    QObject *rv = (QObject *)operator new(d->extraData.cd->allocationSize + additionalMemory);
    d->extraData.cd->newFunc(rv);

    if (rv && !d->metaObjects.isEmpty())
        (void)new QQmlProxyMetaObject(rv, &d->metaObjects);

    *out = rv;
    *memory = ((char *)rv) + d->extraData.cd->allocationSize;
}

QQmlType::SingletonInstanceInfo *QQmlType::singletonInstanceInfo() const
{
    if (d->regType != SingletonType)
        return 0;
    return d->extraData.sd->singletonInstanceInfo;
}

QQmlCustomParser *QQmlType::customParser() const
{
    if (d->regType != CppType)
        return 0;
    return d->extraData.cd->customParser;
}

QQmlType::CreateFunc QQmlType::createFunction() const
{
    if (d->regType != CppType)
        return 0;
    return d->extraData.cd->newFunc;
}

QString QQmlType::noCreationReason() const
{
    if (d->regType != CppType)
        return QString();
    return d->extraData.cd->noCreationReason;
}

int QQmlType::createSize() const
{
    if (d->regType != CppType)
        return 0;
    return d->extraData.cd->allocationSize;
}

bool QQmlType::isCreatable() const
{
    return d->regType == CppType && d->extraData.cd->newFunc;
}

bool QQmlType::isExtendedType() const
{
    d->init();

    return !d->metaObjects.isEmpty();
}

bool QQmlType::isSingleton() const
{
    return d->regType == SingletonType;
}

bool QQmlType::isInterface() const
{
    return d->regType == InterfaceType;
}

bool QQmlType::isComposite() const
{
    return d->regType == CompositeType;
}

int QQmlType::typeId() const
{
    return d->typeId;
}

int QQmlType::qListTypeId() const
{
    return d->listId;
}

const QMetaObject *QQmlType::metaObject() const
{
    d->init();

    if (d->metaObjects.isEmpty())
        return d->baseMetaObject;
    else
        return d->metaObjects.first().metaObject;

}

const QMetaObject *QQmlType::baseMetaObject() const
{
    return d->baseMetaObject;
}

bool QQmlType::containsRevisionedAttributes() const
{
    d->init();

    return d->containsRevisionedAttributes;
}

int QQmlType::metaObjectRevision() const
{
    return d->revision;
}

QQmlAttachedPropertiesFunc QQmlType::attachedPropertiesFunction() const
{
    if (d->regType != CppType)
        return 0;
    return d->extraData.cd->attachedPropertiesFunc;
}

const QMetaObject *QQmlType::attachedPropertiesType() const
{
    if (d->regType != CppType)
        return 0;
    return d->extraData.cd->attachedPropertiesType;
}

/*
This is the id passed to qmlAttachedPropertiesById().  This is different from the index
for the case that a single class is registered under two or more names (eg. Item in 
Qt 4.7 and QtQuick 1.0).
*/
int QQmlType::attachedPropertiesId() const
{
    if (d->regType != CppType)
        return 0;
    return d->extraData.cd->attachedPropertiesId;
}

int QQmlType::parserStatusCast() const
{
    if (d->regType != CppType)
        return -1;
    return d->extraData.cd->parserStatusCast;
}

int QQmlType::propertyValueSourceCast() const
{
    if (d->regType != CppType)
        return -1;
    return d->extraData.cd->propertyValueSourceCast;
}

int QQmlType::propertyValueInterceptorCast() const
{
    if (d->regType != CppType)
        return -1;
    return d->extraData.cd->propertyValueInterceptorCast;
}

const char *QQmlType::interfaceIId() const
{
    if (d->regType != InterfaceType)
        return 0;
    return d->iid;
}

int QQmlType::index() const
{
    return d->index;
}

QUrl QQmlType::sourceUrl() const
{
    if (d->regType != CompositeType)
        return QUrl();
    return d->extraData.fd->url;
}

int QQmlType::enumValue(const QHashedStringRef &name, bool *ok) const
{
    Q_ASSERT(ok);
    *ok = true;

    d->initEnums();

    int *rv = d->enums.value(name);
    if (rv)
        return *rv;

    *ok = false;
    return -1;
}

int QQmlType::enumValue(const QHashedCStringRef &name, bool *ok) const
{
    Q_ASSERT(ok);
    *ok = true;

    d->initEnums();

    int *rv = d->enums.value(name);
    if (rv)
        return *rv;

    *ok = false;
    return -1;
}

int QQmlType::enumValue(const QHashedV8String &name, bool *ok) const
{
    Q_ASSERT(ok);
    *ok = true;

    d->initEnums();

    int *rv = d->enums.value(name);
    if (rv)
        return *rv;

    *ok = false;
    return -1;
}

QQmlTypeModule::QQmlTypeModule()
: d(new QQmlTypeModulePrivate)
{
}

QQmlTypeModule::~QQmlTypeModule()
{
    delete d; d = 0;
}

QString QQmlTypeModule::module() const
{
    return d->uri.uri;
}

int QQmlTypeModule::majorVersion() const
{
    return d->uri.majorVersion;
}

int QQmlTypeModule::minimumMinorVersion() const
{
    return d->minMinorVersion;
}

int QQmlTypeModule::maximumMinorVersion() const
{
    return d->maxMinorVersion;
}

void QQmlTypeModulePrivate::add(QQmlType *type)
{
    minMinorVersion = qMin(minMinorVersion, type->minorVersion());
    maxMinorVersion = qMax(maxMinorVersion, type->minorVersion());

    QList<QQmlType *> &list = typeHash[type->elementName()];
    for (int ii = 0; ii < list.count(); ++ii) {
        if (list.at(ii)->minorVersion() < type->minorVersion()) {
            list.insert(ii, type);
            return;
        }
    }
    list.append(type);
}

QQmlType *QQmlTypeModule::type(const QHashedStringRef &name, int minor)
{
    QReadLocker lock(metaTypeDataLock());

    QList<QQmlType *> *types = d->typeHash.value(name);
    if (!types) return 0;

    for (int ii = 0; ii < types->count(); ++ii)
        if (types->at(ii)->minorVersion() <= minor)
            return types->at(ii);

    return 0;
}

QQmlType *QQmlTypeModule::type(const QHashedV8String &name, int minor)
{
    QReadLocker lock(metaTypeDataLock());

    QList<QQmlType *> *types = d->typeHash.value(name);
    if (!types) return 0;

    for (int ii = 0; ii < types->count(); ++ii)
        if (types->at(ii)->minorVersion() <= minor)
            return types->at(ii);

    return 0;
}

QList<QQmlType*> QQmlTypeModule::singletonTypes(int minor) const
{
    QReadLocker lock(metaTypeDataLock());

    QList<QQmlType *> retn;
    for (int ii = 0; ii < d->types.count(); ++ii) {
        QQmlType *curr = d->types.at(ii);
        if (curr->isSingleton() && curr->minorVersion() <= minor)
            retn.append(curr);
    }

    return retn;
}


QQmlTypeModuleVersion::QQmlTypeModuleVersion()
: m_module(0), m_minor(0)
{
}

QQmlTypeModuleVersion::QQmlTypeModuleVersion(QQmlTypeModule *module, int minor)
: m_module(module), m_minor(minor)
{
    Q_ASSERT(m_module);
    Q_ASSERT(m_minor >= 0);
}

QQmlTypeModuleVersion::QQmlTypeModuleVersion(const QQmlTypeModuleVersion &o)
: m_module(o.m_module), m_minor(o.m_minor)
{
}

QQmlTypeModuleVersion &QQmlTypeModuleVersion::operator=(const QQmlTypeModuleVersion &o)
{
    m_module = o.m_module;
    m_minor = o.m_minor;
    return *this;
}

QQmlTypeModule *QQmlTypeModuleVersion::module() const
{
    return m_module;
}

int QQmlTypeModuleVersion::minorVersion() const
{
    return m_minor;
}

QQmlType *QQmlTypeModuleVersion::type(const QHashedStringRef &name) const
{
    if (m_module) return m_module->type(name, m_minor);
    else return 0;
}

QQmlType *QQmlTypeModuleVersion::type(const QHashedV8String &name) const
{
    if (m_module) return m_module->type(name, m_minor);
    else return 0;
}

void qmlClearTypeRegistrations() // Declared in qqml.h
{
    //Only cleans global static, assumed no running engine
    QWriteLocker lock(metaTypeDataLock());
    QQmlMetaTypeData *data = metaTypeData();

    for (int i = 0; i < data->types.count(); ++i)
        delete data->types.at(i);

    QQmlMetaTypeData::TypeModules::const_iterator i = data->uriToModule.constBegin();
    for (; i != data->uriToModule.constEnd(); ++i)
        delete *i;

    data->types.clear();
    data->idToType.clear();
    data->nameToType.clear();
    data->urlToType.clear();
    data->metaObjectToType.clear();
    data->uriToModule.clear();

    QQmlEnginePrivate::baseModulesUninitialized = true; //So the engine re-registers its types
    qmlClearEnginePlugins();
}

int registerAutoParentFunction(QQmlPrivate::RegisterAutoParent &autoparent)
{
    QWriteLocker lock(metaTypeDataLock());
    QQmlMetaTypeData *data = metaTypeData();

    data->parentFunctions.append(autoparent.function);

    return data->parentFunctions.count() - 1;
}

int registerInterface(const QQmlPrivate::RegisterInterface &interface)
{
    if (interface.version > 0) 
        qFatal("qmlRegisterType(): Cannot mix incompatible QML versions.");

    QWriteLocker lock(metaTypeDataLock());
    QQmlMetaTypeData *data = metaTypeData();

    int index = data->types.count();

    QQmlType *type = new QQmlType(index, interface);

    data->types.append(type);
    data->idToType.insert(type->typeId(), type);
    data->idToType.insert(type->qListTypeId(), type);
    // XXX No insertMulti, so no multi-version interfaces?
    if (!type->elementName().isEmpty())
        data->nameToType.insert(type->elementName(), type);

    if (data->interfaces.size() <= interface.typeId)
        data->interfaces.resize(interface.typeId + 16);
    if (data->lists.size() <= interface.listId)
        data->lists.resize(interface.listId + 16);
    data->interfaces.setBit(interface.typeId, true);
    data->lists.setBit(interface.listId, true);

    return index;
}

QString registrationTypeString(QQmlType::RegistrationType typeType)
{
    QString typeStr;
    if (typeType == QQmlType::CppType)
        typeStr = QStringLiteral("element");
    else if (typeType == QQmlType::SingletonType)
        typeStr = QStringLiteral("singleton type");
    else
        typeStr = QStringLiteral("type");
    return typeStr;
}

// NOTE: caller must hold a QWriteLocker on "data"
bool checkRegistration(QQmlType::RegistrationType typeType, QQmlMetaTypeData *data, const char *uri, const QString &typeName)
{
    if (!typeName.isEmpty()) {
        int typeNameLen = typeName.length();
        for (int ii = 0; ii < typeNameLen; ++ii) {
            if (!(typeName.at(ii).isLetterOrNumber() || typeName.at(ii) == '_')) {
                QString failure(QCoreApplication::translate("qmlRegisterType", "Invalid QML %1 name \"%2\""));
                data->typeRegistrationFailures.append(failure.arg(registrationTypeString(typeType)).arg(typeName));
                return false;
            }
        }
    }

    if (uri && !typeName.isEmpty()) {
        QString nameSpace = moduleFromUtf8(uri);

        if (!data->typeRegistrationNamespace.isEmpty()) {
            // We can only install types into the registered namespace
            if (nameSpace != data->typeRegistrationNamespace) {
                QString failure(QCoreApplication::translate("qmlRegisterType",
                                                            "Cannot install %1 '%2' into unregistered namespace '%3'"));
                data->typeRegistrationFailures.append(failure.arg(registrationTypeString(typeType)).arg(typeName).arg(nameSpace));
                return false;
            }
        } else if (data->typeRegistrationNamespace != nameSpace) {
            // Is the target namespace protected against further registrations?
            if (data->protectedNamespaces.contains(nameSpace)) {
                QString failure(QCoreApplication::translate("qmlRegisterType",
                                                            "Cannot install %1 '%2' into protected namespace '%3'"));
                data->typeRegistrationFailures.append(failure.arg(registrationTypeString(typeType)).arg(typeName).arg(nameSpace));
                return false;
            }
        }
    }

    return true;
}

// NOTE: caller must hold a QWriteLocker on "data"
void addTypeToData(QQmlType* type, QQmlMetaTypeData *data)
{
    if (!type->elementName().isEmpty())
        data->nameToType.insertMulti(type->elementName(), type);

    if (type->baseMetaObject())
        data->metaObjectToType.insertMulti(type->baseMetaObject(), type);

    if (type->typeId()) {
        data->idToType.insert(type->typeId(), type);
        if (data->objects.size() <= type->typeId())
            data->objects.resize(type->typeId() + 16);
        data->objects.setBit(type->typeId(), true);
    }

    if (type->qListTypeId()) {
        if (data->lists.size() <= type->qListTypeId())
            data->lists.resize(type->qListTypeId() + 16);
        data->lists.setBit(type->qListTypeId(), true);
        data->idToType.insert(type->qListTypeId(), type);
    }

    if (!type->module().isEmpty()) {
        const QHashedString &mod = type->module();

        QQmlMetaTypeData::VersionedUri versionedUri(mod, type->majorVersion());
        QQmlTypeModule *module = data->uriToModule.value(versionedUri);
        if (!module) {
            module = new QQmlTypeModule;
            module->d->uri = versionedUri;
            data->uriToModule.insert(versionedUri, module);
        }
        module->d->add(type);
    }
}

int registerType(const QQmlPrivate::RegisterType &type)
{
    QWriteLocker lock(metaTypeDataLock());
    QQmlMetaTypeData *data = metaTypeData();
    QString elementName = QString::fromUtf8(type.elementName);
    if (!checkRegistration(QQmlType::CppType, data, type.uri, elementName))
        return -1;

    int index = data->types.count();

    QQmlType *dtype = new QQmlType(index, elementName, type);

    data->types.append(dtype);
    addTypeToData(dtype, data);
    if (!type.typeId)
        data->idToType.insert(dtype->typeId(), dtype);

    return index;
}

int registerSingletonType(const QQmlPrivate::RegisterSingletonType &type)
{
    QWriteLocker lock(metaTypeDataLock());
    QQmlMetaTypeData *data = metaTypeData();
    QString typeName = QString::fromUtf8(type.typeName);
    if (!checkRegistration(QQmlType::SingletonType, data, type.uri, typeName))
        return -1;

    int index = data->types.count();

    QQmlType *dtype = new QQmlType(index, typeName, type);

    data->types.append(dtype);
    addTypeToData(dtype, data);

    return index;
}

int registerCompositeType(const QQmlPrivate::RegisterCompositeType &type)
{
    // Assumes URL is absolute and valid. Checking of user input should happen before the URL enters type.
    QWriteLocker lock(metaTypeDataLock());
    QQmlMetaTypeData *data = metaTypeData();
    QString typeName = QString::fromUtf8(type.typeName);
    bool fileImport = false;
    if (*(type.uri) == '\0')
        fileImport = true;
    if (!checkRegistration(QQmlType::CompositeType, data, fileImport?0:type.uri, typeName))
        return -1;

    int index = data->types.count();

    QQmlType *dtype = new QQmlType(index, typeName, type);
    data->types.append(dtype);
    addTypeToData(dtype, data);

    if (fileImport)
        data->urlToType.insertMulti(type.url, dtype);

    return index;
}


/*
This method is "over generalized" to allow us to (potentially) register more types of things in
the future without adding exported symbols.
*/
int QQmlPrivate::qmlregister(RegistrationType type, void *data)
{
    if (type == TypeRegistration) {
        return registerType(*reinterpret_cast<RegisterType *>(data));
    } else if (type == InterfaceRegistration) {
        return registerInterface(*reinterpret_cast<RegisterInterface *>(data));
    } else if (type == AutoParentRegistration) {
        return registerAutoParentFunction(*reinterpret_cast<RegisterAutoParent *>(data));
    } else if (type == SingletonRegistration) {
        return registerSingletonType(*reinterpret_cast<RegisterSingletonType *>(data));
    } else if (type == CompositeRegistration) {
        return registerCompositeType(*reinterpret_cast<RegisterCompositeType *>(data));
    }
    return -1;
}

bool QQmlMetaType::namespaceContainsRegistrations(const QString &uri)
{
    QQmlMetaTypeData *data = metaTypeData();

    // Has any type previously been installed to this namespace?
    QHashedString nameSpace(uri);
    foreach (const QQmlType *type, data->types)
        if (type->module() == nameSpace)
            return true;

    return false;
}

void QQmlMetaType::protectNamespace(const QString &uri)
{
    QQmlMetaTypeData *data = metaTypeData();

    data->protectedNamespaces.insert(uri);
}

void QQmlMetaType::setTypeRegistrationNamespace(const QString &uri)
{
    QQmlMetaTypeData *data = metaTypeData();

    data->typeRegistrationNamespace = uri;
    data->typeRegistrationFailures.clear();
}

QStringList QQmlMetaType::typeRegistrationFailures()
{
    QQmlMetaTypeData *data = metaTypeData();

    return data->typeRegistrationFailures;
}

QReadWriteLock *QQmlMetaType::typeRegistrationLock()
{
    return metaTypeDataLock();
}

/*
    Returns true if a module \a uri of any version is installed.
*/
bool QQmlMetaType::isAnyModule(const QString &uri)
{
    QReadLocker lock(metaTypeDataLock());
    QQmlMetaTypeData *data = metaTypeData();

    for (QQmlMetaTypeData::TypeModules::ConstIterator iter = data->uriToModule.begin();
         iter != data->uriToModule.end(); ++iter) {
        if ((*iter)->module() == uri)
            return true;
    }

    return false;
}

/*
    Returns true if any type or API has been registered for the given \a module with at least
    versionMajor.versionMinor, or if types have been registered for \a module with at most
    versionMajor.versionMinor.

    So if only 4.7 and 4.9 have been registered, 4.7,4.8, and 4.9 are valid, but not 4.6 nor 4.10.
*/
bool QQmlMetaType::isModule(const QString &module, int versionMajor, int versionMinor)
{
    Q_ASSERT(versionMajor >= 0 && versionMinor >= 0);
    QReadLocker lock(metaTypeDataLock());

    QQmlMetaTypeData *data = metaTypeData();

    // first, check Types
    QQmlTypeModule *tm = 
        data->uriToModule.value(QQmlMetaTypeData::VersionedUri(module, versionMajor));
    if (tm && tm->minimumMinorVersion() <= versionMinor && tm->maximumMinorVersion() >= versionMinor)
        return true;

    return false;
}

QQmlTypeModule *QQmlMetaType::typeModule(const QString &uri, int majorVersion)
{
    QReadLocker lock(metaTypeDataLock());
    QQmlMetaTypeData *data = metaTypeData();
    return data->uriToModule.value(QQmlMetaTypeData::VersionedUri(uri, majorVersion));
}

QList<QQmlPrivate::AutoParentFunction> QQmlMetaType::parentFunctions()
{
    QReadLocker lock(metaTypeDataLock());
    QQmlMetaTypeData *data = metaTypeData();
    return data->parentFunctions;
}

QObject *QQmlMetaType::toQObject(const QVariant &v, bool *ok)
{
    if (!isQObject(v.userType())) {
        if (ok) *ok = false;
        return 0;
    }

    if (ok) *ok = true;

    return *(QObject **)v.constData();
}

bool QQmlMetaType::isQObject(int userType)
{
    if (userType == QMetaType::QObjectStar)
        return true;

    QReadLocker lock(metaTypeDataLock());
    QQmlMetaTypeData *data = metaTypeData();
    return userType >= 0 && userType < data->objects.size() && data->objects.testBit(userType);
}

/*
    Returns the item type for a list of type \a id.
 */
int QQmlMetaType::listType(int id)
{
    QReadLocker lock(metaTypeDataLock());
    QQmlMetaTypeData *data = metaTypeData();
    QQmlType *type = data->idToType.value(id);
    if (type && type->qListTypeId() == id)
        return type->typeId();
    else
        return 0;
}

int QQmlMetaType::attachedPropertiesFuncId(const QMetaObject *mo)
{
    QReadLocker lock(metaTypeDataLock());
    QQmlMetaTypeData *data = metaTypeData();

    QQmlType *type = data->metaObjectToType.value(mo);
    if (type && type->attachedPropertiesFunction())
        return type->attachedPropertiesId();
    else
        return -1;
}

QQmlAttachedPropertiesFunc QQmlMetaType::attachedPropertiesFuncById(int id)
{
    if (id < 0)
        return 0;
    QReadLocker lock(metaTypeDataLock());
    QQmlMetaTypeData *data = metaTypeData();
    return data->types.at(id)->attachedPropertiesFunction();
}

QMetaProperty QQmlMetaType::defaultProperty(const QMetaObject *metaObject)
{
    int idx = metaObject->indexOfClassInfo("DefaultProperty");
    if (-1 == idx)
        return QMetaProperty();

    QMetaClassInfo info = metaObject->classInfo(idx);
    if (!info.value())
        return QMetaProperty();

    idx = metaObject->indexOfProperty(info.value());
    if (-1 == idx)
        return QMetaProperty();

    return metaObject->property(idx);
}

QMetaProperty QQmlMetaType::defaultProperty(QObject *obj)
{
    if (!obj)
        return QMetaProperty();

    const QMetaObject *metaObject = obj->metaObject();
    return defaultProperty(metaObject);
}

QMetaMethod QQmlMetaType::defaultMethod(const QMetaObject *metaObject)
{
    int idx = metaObject->indexOfClassInfo("DefaultMethod");
    if (-1 == idx)
        return QMetaMethod();

    QMetaClassInfo info = metaObject->classInfo(idx);
    if (!info.value())
        return QMetaMethod();

    idx = metaObject->indexOfMethod(info.value());
    if (-1 == idx)
        return QMetaMethod();

    return metaObject->method(idx);
}

QMetaMethod QQmlMetaType::defaultMethod(QObject *obj)
{
    if (!obj)
        return QMetaMethod();

    const QMetaObject *metaObject = obj->metaObject();
    return defaultMethod(metaObject);
}

QQmlMetaType::TypeCategory QQmlMetaType::typeCategory(int userType)
{
    if (userType < 0)
        return Unknown;
    if (userType == QMetaType::QObjectStar)
        return Object;

    QReadLocker lock(metaTypeDataLock());
    QQmlMetaTypeData *data = metaTypeData();
    if (userType < data->objects.size() && data->objects.testBit(userType))
        return Object;
    else if (userType < data->lists.size() && data->lists.testBit(userType))
        return List;
    else
        return Unknown;
}

bool QQmlMetaType::isInterface(int userType)
{
    QReadLocker lock(metaTypeDataLock());
    QQmlMetaTypeData *data = metaTypeData();
    return userType >= 0 && userType < data->interfaces.size() && data->interfaces.testBit(userType);
}

const char *QQmlMetaType::interfaceIId(int userType)
{
    QReadLocker lock(metaTypeDataLock());
    QQmlMetaTypeData *data = metaTypeData();
    QQmlType *type = data->idToType.value(userType);
    lock.unlock();
    if (type && type->isInterface() && type->typeId() == userType)
        return type->interfaceIId();
    else
        return 0;
}

bool QQmlMetaType::isList(int userType)
{
    QReadLocker lock(metaTypeDataLock());
    QQmlMetaTypeData *data = metaTypeData();
    return userType >= 0 && userType < data->lists.size() && data->lists.testBit(userType);
}

/*!
    A custom string convertor allows you to specify a function pointer that
    returns a variant of \a type. For example, if you have written your own icon
    class that you want to support as an object property assignable in QML:

    \code
    int type = qRegisterMetaType<SuperIcon>("SuperIcon");
    QML::addCustomStringConvertor(type, &SuperIcon::pixmapFromString);
    \endcode

    The function pointer must be of the form:
    \code
    QVariant (*StringConverter)(const QString &);
    \endcode
 */
void QQmlMetaType::registerCustomStringConverter(int type, StringConverter converter)
{
    QWriteLocker lock(metaTypeDataLock());

    QQmlMetaTypeData *data = metaTypeData();
    if (data->stringConverters.contains(type))
        return;
    data->stringConverters.insert(type, converter);
}

/*!
    Return the custom string converter for \a type, previously installed through
    registerCustomStringConverter()
 */
QQmlMetaType::StringConverter QQmlMetaType::customStringConverter(int type)
{
    QReadLocker lock(metaTypeDataLock());

    QQmlMetaTypeData *data = metaTypeData();
    return data->stringConverters.value(type);
}

/*!
    Returns the type (if any) of URI-qualified named \a qualifiedName and version specified
    by \a version_major and \a version_minor.
*/
QQmlType *QQmlMetaType::qmlType(const QString &qualifiedName, int version_major, int version_minor)
{
    int slash = qualifiedName.indexOf(QLatin1Char('/'));
    if (slash <= 0)
        return 0;

    QHashedStringRef module(qualifiedName.constData(), slash);
    QHashedStringRef name(qualifiedName.constData() + slash + 1, qualifiedName.length() - slash - 1);

    return qmlType(name, module, version_major, version_minor);
}

/*!
    Returns the type (if any) of \a name in \a module and version specified
    by \a version_major and \a version_minor.
*/
QQmlType *QQmlMetaType::qmlType(const QHashedStringRef &name, const QHashedStringRef &module, int version_major, int version_minor)
{
    Q_ASSERT(version_major >= 0 && version_minor >= 0);
    QReadLocker lock(metaTypeDataLock());
    QQmlMetaTypeData *data = metaTypeData();

    QQmlMetaTypeData::Names::ConstIterator it = data->nameToType.constFind(name);
    while (it != data->nameToType.end() && it.key() == name) {
        // XXX version_major<0 just a kludge for QQmlPropertyPrivate::initProperty
        if (version_major < 0 || module.isEmpty() || (*it)->availableInVersion(module, version_major,version_minor))
            return (*it);
        ++it;
    }

    return 0;
}

/*!
    Returns the type (if any) that corresponds to the \a metaObject.  Returns null if no
    type is registered.
*/
QQmlType *QQmlMetaType::qmlType(const QMetaObject *metaObject)
{
    QReadLocker lock(metaTypeDataLock());
    QQmlMetaTypeData *data = metaTypeData();

    return data->metaObjectToType.value(metaObject);
}

/*!
    Returns the type (if any) that corresponds to the \a metaObject in version specified
    by \a version_major and \a version_minor in module specified by \a uri.  Returns null if no
    type is registered.
*/
QQmlType *QQmlMetaType::qmlType(const QMetaObject *metaObject, const QHashedStringRef &module, int version_major, int version_minor)
{
    Q_ASSERT(version_major >= 0 && version_minor >= 0);
    QReadLocker lock(metaTypeDataLock());
    QQmlMetaTypeData *data = metaTypeData();

    QQmlMetaTypeData::MetaObjects::const_iterator it = data->metaObjectToType.constFind(metaObject);
    while (it != data->metaObjectToType.end() && it.key() == metaObject) {
        QQmlType *t = *it;
        if (version_major < 0 || module.isEmpty() || t->availableInVersion(module, version_major,version_minor))
            return t;
        ++it;
    }

    return 0;
}

/*!
    Returns the type (if any) that corresponds to the QVariant::Type \a userType.  
    Returns null if no type is registered.
*/
QQmlType *QQmlMetaType::qmlType(int userType)
{
    QReadLocker lock(metaTypeDataLock());
    QQmlMetaTypeData *data = metaTypeData();

    QQmlType *type = data->idToType.value(userType);
    if (type && type->typeId() == userType)
        return type;
    else
        return 0;
}

/*!
    Returns the type (if any) that corresponds to the given \a url in the set of
    composite types added through file imports.

    Returns null if no such type is registered.
*/
QQmlType *QQmlMetaType::qmlType(const QUrl &url)
{
    QReadLocker lock(metaTypeDataLock());
    QQmlMetaTypeData *data = metaTypeData();

    QQmlType *type = data->urlToType.value(url);
    if (type && type->sourceUrl() == url)
        return type;
    else
        return 0;
}

/*!
    Returns the type (if any) with the given \a index in the global type store.
    This is for use when you just got the index back from a qmlRegister function.
    Returns null if the index is out of bounds.
*/
QQmlType *QQmlMetaType::qmlTypeFromIndex(int idx)
{
    QReadLocker lock(metaTypeDataLock());
    QQmlMetaTypeData *data = metaTypeData();

    if (idx < 0 || idx >= data->types.count())
            return 0;
    return data->types[idx];
}

/*!
    Returns the list of registered QML type names.
*/
QList<QString> QQmlMetaType::qmlTypeNames()
{
    QReadLocker lock(metaTypeDataLock());
    QQmlMetaTypeData *data = metaTypeData();

    QList<QString> names;
    QQmlMetaTypeData::Names::ConstIterator it = data->nameToType.begin();
    while (it != data->nameToType.end()) {
        names += (*it)->qmlTypeName();
        ++it;
    }

    return names;
}

/*!
    Returns the list of registered QML types.
*/
QList<QQmlType*> QQmlMetaType::qmlTypes()
{
    QReadLocker lock(metaTypeDataLock());
    QQmlMetaTypeData *data = metaTypeData();

    return data->nameToType.values();
}

/*!
    Returns the list of registered QML singleton types.
*/
QList<QQmlType*> QQmlMetaType::qmlSingletonTypes()
{
    QReadLocker lock(metaTypeDataLock());
    QQmlMetaTypeData *data = metaTypeData();

    QList<QQmlType*> alltypes = data->nameToType.values();
    QList<QQmlType*> retn;
    foreach (QQmlType* t, alltypes) {
        if (t->isSingleton()) {
            retn.append(t);
        }
    }

    return retn;
}

int QQmlMetaType::QQuickAnchorLineMetaTypeId()
{
    static int id = 0;
    if (!id) {
        id = QMetaType::type("QQuickAnchorLine");
    }
    return id;
}

QQmlMetaType::CompareFunction QQmlMetaType::anchorLineCompareFunction = 0;

void QQmlMetaType::setQQuickAnchorLineCompareFunction(CompareFunction fun)
{
    anchorLineCompareFunction = fun;
}

bool QQmlMetaType::QQuickAnchorLineCompare(const void *p1, const void *p2)
{
    Q_ASSERT(anchorLineCompareFunction != 0);
    return anchorLineCompareFunction(p1, p2);
}

QT_END_NAMESPACE
