qsequentialiterable.cpp

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// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include <QtCore/qsequentialiterable.h>
#include <QtCore/qvariant.h>
 
#include <QtCore/private/qiterable_p.h>
 
QT_BEGIN_NAMESPACE
 
void QSequentialIterable::addValue(const QVariant &value, Position position)
{
    QtPrivate::QVariantTypeCoercer coercer;
    const void *valuePtr = coercer.coerce(value, metaContainer().valueMetaType());
 
    switch (position) {
    case AtBegin:
        if (metaContainer().canAddValueAtBegin())
            metaContainer().addValueAtBegin(mutableIterable(), valuePtr);
        break;
    case AtEnd:
        if (metaContainer().canAddValueAtEnd())
            metaContainer().addValueAtEnd(mutableIterable(), valuePtr);
        break;
    case Unspecified:
        if (metaContainer().canAddValue())
            metaContainer().addValue(mutableIterable(), valuePtr);
        break;
    }
}
 
void QSequentialIterable::removeValue(Position position)
{
    switch (position) {
    case AtBegin:
        if (metaContainer().canRemoveValueAtBegin())
            metaContainer().removeValueAtBegin(mutableIterable());
        break;
    case AtEnd:
        if (metaContainer().canRemoveValueAtEnd())
            metaContainer().removeValueAtEnd(mutableIterable());
        break;
    case Unspecified:
        if (metaContainer().canRemoveValue())
            metaContainer().removeValue(mutableIterable());
        break;
    }
}
 
QMetaType QSequentialIterable::valueMetaType() const
{
    return QMetaType(metaContainer().valueMetaType());
}
 
QVariant QSequentialIterable::at(qsizetype idx) const
{
    QVariant v(valueMetaType());
    void *dataPtr;
    if (valueMetaType() == QMetaType::fromType<QVariant>())
        dataPtr = &v;
    else
        dataPtr = v.data();
 
    const QMetaSequence meta = metaContainer();
    if (meta.canGetValueAtIndex()) {
        meta.valueAtIndex(m_iterable.constPointer(), idx, dataPtr);
    } else if (meta.canGetValueAtConstIterator()) {
        void *iterator = meta.constBegin(m_iterable.constPointer());
        meta.advanceConstIterator(iterator, idx);
        meta.valueAtConstIterator(iterator, dataPtr);
        meta.destroyConstIterator(iterator);
    }
 
    return v;
}
 
void QSequentialIterable::set(qsizetype idx, const QVariant &value)
{
    QtPrivate::QVariantTypeCoercer coercer;
    const void *dataPtr = coercer.coerce(value, metaContainer().valueMetaType());
 
    const QMetaSequence meta = metaContainer();
    if (meta.canSetValueAtIndex()) {
        meta.setValueAtIndex(m_iterable.mutablePointer(), idx, dataPtr);
    } else if (meta.canSetValueAtIterator()) {
        void *iterator = meta.begin(m_iterable.mutablePointer());
        meta.advanceIterator(iterator, idx);
        meta.setValueAtIterator(iterator, dataPtr);
        meta.destroyIterator(iterator);
    }
}
 
QVariantRef<QSequentialIterator> QSequentialIterator::operator*() const
{
    return QVariantRef<QSequentialIterator>(this);
}
 
QVariantPointer<QSequentialIterator> QSequentialIterator::operator->() const
{
    return QVariantPointer<QSequentialIterator>(this);
}
 
QVariant QSequentialConstIterator::operator*() const
{
    return QIterablePrivate::retrieveElement(metaContainer().valueMetaType(), [this](void *dataPtr) {
        metaContainer().valueAtConstIterator(constIterator(), dataPtr);
    });
}
 
QVariantConstPointer QSequentialConstIterator::operator->() const
{
    return QVariantConstPointer(operator*());
}
 
QT_END_NAMESPACE