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/*
* Copyright (C) 2014 Christian Mollekopf <chrigi_1@fastmail.fm>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) version 3, or any
* later version accepted by the membership of KDE e.V. (or its
* successor approved by the membership of KDE e.V.), which shall
* act as a proxy defined in Section 6 of version 3 of the license.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <QAbstractItemModel>
#include <QModelIndex>
#include <QDebug>
#include "query.h"
#include "resultprovider.h"
template<class T, class Ptr>
class ModelResult : public QAbstractItemModel
{
public:
enum Roles {
DomainObjectRole = Qt::UserRole + 1
};
ModelResult(const Akonadi2::Query &query, const QList<QByteArray> &propertyColumns)
:QAbstractItemModel(),
mPropertyColumns(propertyColumns)
{
}
static qint64 getIdentifier(const QModelIndex &idx)
{
if (!idx.isValid()) {
return 0;
}
return idx.internalId();
}
int rowCount(const QModelIndex &parent = QModelIndex()) const
{
return mTree[getIdentifier(parent)].size();
}
int columnCount(const QModelIndex &parent = QModelIndex()) const
{
return mPropertyColumns.size();
}
virtual QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const
{
if (role == DomainObjectRole) {
qWarning() << "trying to get entity " << index.internalId();
Q_ASSERT(mEntities.contains(index.internalId()));
return QVariant::fromValue(mEntities.value(index.internalId()));
}
qDebug() << "Invalid role";
return QVariant();
}
QModelIndex index(int row, int column, const QModelIndex & parent = QModelIndex()) const
{
auto id = getIdentifier(parent);
auto childId = mTree.value(id).at(row);
return createIndex(row, column, childId);
}
QModelIndex createIndexFromId(const qint64 &id) const
{
auto grandParentId = mParents.value(id, 0);
auto row = mTree.value(grandParentId).indexOf(id);
return createIndex(row, 0, id);
}
QModelIndex parent(const QModelIndex &index) const
{
auto id = getIdentifier(index);
auto parentId = mParents.value(id);
return createIndexFromId(parentId);
}
bool canFetchMore(const QModelIndex &parent) const
{
return mEntityChildrenFetched.value(parent.internalId());
}
void fetchMore(const QModelIndex &parent)
{
fetchEntities(parent);
}
qint64 parentId(const Ptr &value)
{
return qHash(value->getProperty("parent").toByteArray());
}
void add(const Ptr &value)
{
auto childId = qHash(value->identifier());
auto id = parentId(value);
//Ignore updates we get before the initial fetch is done
if (!mEntityChildrenFetched[id]) {
return;
}
auto parent = createIndexFromId(id);
qDebug() << "Added entity " << childId << value->identifier();
const auto keys = mTree[id];
int index = 0;
for (; index < keys.size(); index++) {
if (childId < keys.at(index)) {
break;
}
}
beginInsertRows(parent, index, index);
mEntities.insert(childId, value);
mTree[id].insert(index, childId);
mParents.insert(childId, id);
endInsertRows();
}
void modify(const Ptr &value)
{
auto childId = qHash(value->identifier());
auto id = parentId(value);
//Ignore updates we get before the initial fetch is done
if (!mEntityChildrenFetched[id]) {
return;
}
auto parent = createIndexFromId(id);
qDebug() << "Modified entity" << childId;
auto i = mTree[id].indexOf(childId);
mEntities.remove(childId);
mEntities.insert(childId, value);
//TODO check for change of parents
auto idx = index(i, 0, parent);
emit dataChanged(idx, idx);
}
void remove(const Ptr &value)
{
auto childId = qHash(value->identifier());
auto id = parentId(value);
auto parent = createIndexFromId(id);
qDebug() << "Removed entity" << childId;
auto index = mTree[id].indexOf(qHash(value->identifier()));
beginRemoveRows(parent, index, index);
mEntities.remove(childId);
mTree[id].removeAll(childId);
mParents.remove(childId);
//TODO remove children
endRemoveRows();
}
void fetchEntities(const QModelIndex &parent)
{
const auto id = getIdentifier(parent);
mEntityChildrenFetched[id] = true;
QByteArray parentIdentifier;
if (!parent.isValid()) {
qDebug() << "no parent";
} else {
qDebug() << "parent is valid";
auto object = parent.data(DomainObjectRole).template value<Ptr>();
Q_ASSERT(object);
parentIdentifier = object->identifier();
}
Trace() << "Loading child entities of: " << parentIdentifier;
loadEntities(parentIdentifier);
}
void setFetcher(const std::function<void(const QByteArray &parent)> &fetcher)
{
Trace() << "Setting fetcher";
loadEntities = fetcher;
}
private:
//TODO we should be able to directly use T as index, with an appropriate hash function, and thus have a QMap<T, T> and QList<T>
QMap<qint64 /* entity id */, Ptr> mEntities;
QMap<qint64 /* parent entity id */, QList<qint64> /* child entity id*/> mTree;
QMap<qint64 /* child entity id */, qint64 /* parent entity id*/> mParents;
QMap<qint64 /* entity id */, bool> mEntityChildrenFetched;
QList<QByteArray> mPropertyColumns;
Akonadi2::Query mQuery;
std::function<void(const QByteArray &)> loadEntities;
};
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