qobjectxmlmodel.cpp Example File xmlpatterns/qobjectxmlmodel/qobjectxmlmodel.cpp
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#include <QVector>
#include <QtDebug>
#include <QCoreApplication>
#include <QMetaProperty>
#include <QXmlQuery>
#include <QXmlResultItems>
#include "qobjectxmlmodel.h"
/*
<metaObjects>
<metaObject className="QObject"/>
<metaObject className="QWidget" superClass="QObject">
</metaObject>
...
</metaObjects>
<QObject objectName="MyWidget" property1="..." property2="..."> <!-- This is root() -->
<QObject objectName="MyFOO" property1="..."/>
....
</QObject>
*/
QObjectXmlModel::QObjectXmlModel(QObject *const object, const QXmlNamePool &np)
: QSimpleXmlNodeModel(np),
m_baseURI(QUrl::fromLocalFile(QCoreApplication::applicationFilePath())),
m_root(object),
m_allMetaObjects(allMetaObjects())
{
Q_ASSERT(m_baseURI.isValid());
}
QXmlNodeModelIndex QObjectXmlModel::qObjectSibling(const int pos, const QXmlNodeModelIndex &n) const
{
Q_ASSERT(pos == 1 || pos == -1);
Q_ASSERT(asQObject(n));
const QObject *parent = asQObject(n)->parent();
if (parent) {
const QList<QObject *> &children = parent->children();
const int siblingPos = children.indexOf(asQObject(n)) + pos;
if (siblingPos >= 0 && siblingPos < children.count())
return createIndex(children.at(siblingPos));
else
return QXmlNodeModelIndex();
}
else
return QXmlNodeModelIndex();
}
QObjectXmlModel::QObjectNodeType QObjectXmlModel::toNodeType(const QXmlNodeModelIndex &n)
{
return QObjectNodeType(n.additionalData() & (15 << 26));
}
QObjectXmlModel::AllMetaObjects QObjectXmlModel::allMetaObjects() const
{
QXmlQuery query(namePool());
query.bindVariable("root", root());
query.setQuery("declare variable $root external;"
"$root/descendant-or-self::QObject");
Q_ASSERT(query.isValid());
QXmlResultItems result;
query.evaluateTo(&result);
QXmlItem i(result.next());
AllMetaObjects objects;
while (!i.isNull()) {
const QMetaObject *moo = asQObject(i.toNodeModelIndex())->metaObject();
while (moo) {
if (!objects.contains(moo))
objects.append(moo);
moo = moo->superClass();
}
i = result.next();
}
Q_ASSERT(!objects.contains(0));
return objects;
}
QXmlNodeModelIndex QObjectXmlModel::metaObjectSibling(const int pos, const QXmlNodeModelIndex &n) const
{
Q_ASSERT(pos == 1 || pos == -1);
Q_ASSERT(!n.isNull());
const int indexOf = m_allMetaObjects.indexOf(static_cast<const QMetaObject *>(n.internalPointer())) + pos;
if (indexOf >= 0 && indexOf < m_allMetaObjects.count())
return createIndex(const_cast<QMetaObject *>(m_allMetaObjects.at(indexOf)), MetaObject);
else
return QXmlNodeModelIndex();
}
QXmlNodeModelIndex QObjectXmlModel::nextFromSimpleAxis(SimpleAxis axis, const QXmlNodeModelIndex &n) const
{
switch (toNodeType(n))
{
case IsQObject:
{
switch (axis)
{
case Parent:
return createIndex(asQObject(n)->parent());
case FirstChild:
{
if (!asQObject(n) || asQObject(n)->children().isEmpty())
return QXmlNodeModelIndex();
else
return createIndex(asQObject(n)->children().first());
}
case NextSibling:
return qObjectSibling(1, n);
case PreviousSibling:
{
if (asQObject(n) == m_root)
return createIndex(qint64(0), MetaObjects);
else
return qObjectSibling(-1, n);
}
}
Q_ASSERT(false);
}
case QObjectClassName:
case QObjectProperty:
{
Q_ASSERT(axis == Parent);
return createIndex(asQObject(n));
}
case MetaObjects:
{
switch (axis)
{
case Parent:
return QXmlNodeModelIndex();
case PreviousSibling:
return QXmlNodeModelIndex();
case NextSibling:
return root();
case FirstChild:
{
return createIndex(const_cast<QMetaObject*>(m_allMetaObjects.first()),MetaObject);
}
}
Q_ASSERT(false);
}
case MetaObject:
{
switch (axis)
{
case FirstChild:
return QXmlNodeModelIndex();
case Parent:
return createIndex(qint64(0), MetaObjects);
case PreviousSibling:
return metaObjectSibling(-1, n);
case NextSibling:
return metaObjectSibling(1, n);
}
}
case MetaObjectClassName:
case MetaObjectSuperClass:
{
Q_ASSERT(axis == Parent);
return createIndex(asQObject(n), MetaObject);
}
}
Q_ASSERT(false);
return QXmlNodeModelIndex();
}
QVector<QXmlNodeModelIndex> QObjectXmlModel::attributes(const QXmlNodeModelIndex& n) const
{
QVector<QXmlNodeModelIndex> result;
QObject *const object = asQObject(n);
switch(toNodeType(n))
{
case IsQObject:
{
const QMetaObject *const metaObject = object->metaObject();
const int count = metaObject->propertyCount();
result.append(createIndex(object, QObjectClassName));
for (int i = 0; i < count; ++i) {
const QMetaProperty qmp(metaObject->property(i));
const int ii = metaObject->indexOfProperty(qmp.name());
if (i == ii)
result.append(createIndex(object, QObjectProperty | i));
}
return result;
}
case MetaObject:
{
result.append(createIndex(object, MetaObjectClassName));
result.append(createIndex(object, MetaObjectSuperClass));
return result;
}
default:
return QVector<QXmlNodeModelIndex>();
}
}
QObject *QObjectXmlModel::asQObject(const QXmlNodeModelIndex &n)
{
return static_cast<QObject *>(n.internalPointer());
}
bool QObjectXmlModel::isProperty(const QXmlNodeModelIndex n)
{
return n.additionalData() & QObjectProperty;
}
QUrl QObjectXmlModel::documentUri(const QXmlNodeModelIndex& ) const
{
return m_baseURI;
}
QXmlNodeModelIndex::NodeKind QObjectXmlModel::kind(const QXmlNodeModelIndex& n) const
{
switch (toNodeType(n))
{
case IsQObject:
case MetaObject:
case MetaObjects:
return QXmlNodeModelIndex::Element;
case QObjectProperty:
case MetaObjectClassName:
case MetaObjectSuperClass:
case QObjectClassName:
return QXmlNodeModelIndex::Attribute;
}
Q_ASSERT(false);
return QXmlNodeModelIndex::Element;
}
QXmlNodeModelIndex::DocumentOrder QObjectXmlModel::compareOrder(const QXmlNodeModelIndex& , const QXmlNodeModelIndex& ) const
{
return QXmlNodeModelIndex::Follows; // TODO
}
QXmlNodeModelIndex QObjectXmlModel::root() const
{
return createIndex(m_root);
}
QXmlNodeModelIndex QObjectXmlModel::root(const QXmlNodeModelIndex& n) const
{
QObject *p = asQObject(n);
Q_ASSERT(p);
do {
QObject *const candidate = p->parent();
if (candidate)
p = candidate;
else
break;
}
while (true);
return createIndex(p);
}
/*!
We simply throw all of them into a QList and
return an iterator over it.
*/
QXmlNodeModelIndex::List QObjectXmlModel::ancestors(const QXmlNodeModelIndex n) const
{
const QObject *p = asQObject(n);
Q_ASSERT(p);
QXmlNodeModelIndex::List result;
do {
QObject *const candidate = p->parent();
if (candidate) {
result.append(createIndex(candidate, 0));
p = candidate;
}
else
break;
}
while (true);
return result;
}
QMetaProperty QObjectXmlModel::toMetaProperty(const QXmlNodeModelIndex &n)
{
const int propertyOffset = n.additionalData() & (~QObjectProperty);
const QObject *const qo = asQObject(n);
return qo->metaObject()->property(propertyOffset);
}
QXmlName QObjectXmlModel::name(const QXmlNodeModelIndex &n) const
{
switch (toNodeType(n))
{
case IsQObject:
return QXmlName(namePool(), QLatin1String("QObject"));
case MetaObject:
return QXmlName(namePool(), QLatin1String("metaObject"));
case QObjectClassName:
case MetaObjectClassName:
return QXmlName(namePool(), QLatin1String("className"));
case QObjectProperty:
return QXmlName(namePool(), toMetaProperty(n).name());
case MetaObjects:
return QXmlName(namePool(), QLatin1String("metaObjects"));
case MetaObjectSuperClass:
return QXmlName(namePool(), QLatin1String("superClass"));
}
Q_ASSERT(false);
return QXmlName();
}
QVariant QObjectXmlModel::typedValue(const QXmlNodeModelIndex &n) const
{
switch (toNodeType(n))
{
case QObjectProperty:
{
const QVariant &candidate = toMetaProperty(n).read(asQObject(n));
if (isTypeSupported(candidate.type()))
return candidate;
else
return QVariant();
}
case MetaObjectClassName:
return QVariant(static_cast<QMetaObject*>(n.internalPointer())->className());
case MetaObjectSuperClass:
{
const QMetaObject *const superClass = static_cast<QMetaObject*>(n.internalPointer())->superClass();
if (superClass)
return QVariant(superClass->className());
else
return QVariant();
}
case QObjectClassName:
return QVariant(asQObject(n)->metaObject()->className());
default:
return QVariant();
}
}
/*!
Returns \c true if QVariants of type \a type can be used
in QtXmlPatterns, otherwise \c false.
*/
bool QObjectXmlModel::isTypeSupported(QVariant::Type type)
{
/* See data/qatomicvalue.cpp too. */
switch (type)
{
/* Fallthrough all these. */
case QVariant::Char:
case QVariant::String:
case QVariant::Url:
case QVariant::Bool:
case QVariant::ByteArray:
case QVariant::Int:
case QVariant::LongLong:
case QVariant::ULongLong:
case QVariant::Date:
case QVariant::DateTime:
case QVariant::Time:
case QVariant::Double:
return true;
default:
return false;
}
}
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