Initial commit based on GenericQtClient v0.3.0

libs/GenericCore/model/commands/edititemcommand.cpp

@@ -0,0 +1,80 @@
+#include "edititemcommand.h"
+
+#include <QDebug>
+
+#include "../metadata.h"
+#include "../tablemodel.h"
+
+EditItemCommand::EditItemCommand(TableModel* model,
+                                 const QModelIndex& index,
+                                 QMap<int, QVariant>& changedValues,
+                                 QUndoCommand* parent)
+    : QUndoCommand(parent)
+    , m_model(model)
+    , m_row(index.row()) {
+  qInfo() << "New EditCommand...";
+  QString commandText;
+
+  if (changedValues.size() == 1) {
+    qDebug() << "Only one value to change. Using more specific command text...";
+    const int role       = changedValues.firstKey();
+    const QVariant value = changedValues.first();
+    QString roleName     = model->roleNames().value(role);
+
+    if (USER_FACING_ROLES.contains(role)) {
+      commandText = QString("Setting '%1' of item '%2' to '%3'")
+                        .arg(roleName)
+                        .arg(index.data(DEFAULT_ROLE).toString())
+                        .arg(value.toString());
+    } else if (role == IdRole) {
+      commandText = QString("Setting '%1' of item '%2' to '%3'")
+                        .arg(roleName)
+                        .arg(index.data(DEFAULT_ROLE).toString())
+                        .arg(value.toString());
+    } else {
+      qWarning() << "Role didn't match! Using a generic command text...";
+      commandText = QString("Edit item '%1'").arg(index.data(DEFAULT_ROLE).toString());
+    }
+  } else {
+    qDebug() << "More than one value to change. Using a generic command text...";
+    commandText = QString("Edit item '%1'").arg(index.data(DEFAULT_ROLE).toString());
+  }
+  setText(commandText);
+
+  m_newValues = changedValues;
+
+  /// storing old values for undo step
+  m_oldValues = getOldValues(index, changedValues);
+}
+
+void EditItemCommand::undo() {
+  qDebug() << "Undoing the EditCommand...";
+  m_model->execEditItemData(m_row, m_oldValues);
+}
+
+void EditItemCommand::redo() {
+  qDebug() << "(Re-)doing the EditCommand...";
+  m_model->execEditItemData(m_row, m_newValues);
+}
+
+const QMap<int, QVariant> EditItemCommand::getOldValues(
+    const QModelIndex& index,
+    const QMap<int, QVariant>& changedValues) const {
+  QMap<int, QVariant> result;
+  QMap<int, QVariant>::const_iterator i;
+  for (i = changedValues.constBegin(); i != changedValues.constEnd(); ++i) {
+    const int role          = i.key();
+    const QVariant newValue = i.value();
+    const QVariant oldValue = index.data(role);
+    // TODO check if role is a editable role?
+    if (oldValue != newValue) {
+      qDebug() << "oldValue:" << oldValue << "!= newValue:" << newValue;
+      result.insert(role, oldValue);
+    } else {
+      qInfo() << "oldValue is already the same as newValue:" << oldValue;
+    }
+  }
+  // QVariant oldModifiedDate = index.data(ModifiedDateUTCRole);
+  // result.insert(ModifiedDateUTCRole, oldModifiedDate);
+  return result;
+}

libs/GenericCore/model/commands/edititemcommand.h

@@ -0,0 +1,33 @@
+#ifndef EDITITEMCOMMAND_H
+#define EDITITEMCOMMAND_H
+
+#include <QMap>
+#include <QUndoCommand>
+
+class TableModel;
+
+class EditItemCommand : public QUndoCommand {
+ public:
+  // TODO don't use simple pointer to model
+  /// Using simple pointer to model because there was a crash when closing the application with an
+  /// unclean undo stack
+  EditItemCommand(TableModel* model,
+                  const QModelIndex& index,
+                  QMap<int, QVariant>& changedValues,
+                  QUndoCommand* parent = nullptr);
+  /// QUndoCommand interface
+  void undo();
+  void redo();
+
+ private:
+  TableModel* m_model = nullptr;
+  const int m_row;
+  QMap<int, QVariant> m_oldValues;
+  QMap<int, QVariant> m_newValues;
+
+  /// private functions
+  const QMap<int, QVariant> getOldValues(const QModelIndex& index,
+                                         const QMap<int, QVariant>& changedValues) const;
+};
+
+#endif  // EDITITEMCOMMAND_H

libs/GenericCore/model/commands/insertrowscommand.cpp

@@ -0,0 +1,33 @@
+#include "insertrowscommand.h"
+
+#include <QDebug>
+
+#include "../tablemodel.h"
+
+InsertRowsCommand::InsertRowsCommand(TableModel* model,
+                                     int startRow,
+                                     QList<ModelItemValues> valueList,
+                                     QUndoCommand* parent)
+    : QUndoCommand(parent)
+    , m_tableModel(model)
+    , m_startRow(startRow)
+    , m_valueList(valueList) {
+  qInfo() << "New InsertCommand...";
+  const QString commandText =
+      QString("inserting %1 item(s) on row %2").arg(valueList.length()).arg(startRow);
+  setText(commandText);
+}
+
+void InsertRowsCommand::undo() {
+  qDebug() << "Undoing the InsertCommand...";
+  if (m_tableModel) {
+    m_tableModel->execRemoveItems(m_startRow, m_valueList.length());
+  }
+}
+
+void InsertRowsCommand::redo() {
+  qDebug() << "(Re-)doing the InsertCommand...";
+  if (m_tableModel) {
+    m_tableModel->execInsertItems(m_startRow, m_valueList);
+  }
+}

libs/GenericCore/model/commands/insertrowscommand.h

@@ -0,0 +1,30 @@
+#ifndef INSERTROWSCOMMAND_H
+#define INSERTROWSCOMMAND_H
+
+#include <QUndoCommand>
+
+typedef QMap<int, QVariant> ModelItemValues;
+
+class TableModel;
+
+class InsertRowsCommand : public QUndoCommand {
+ public:
+  // TODO don't use simple pointer to model
+  /// Using simple pointer to model because there was a crash when closing the application with an
+  /// unclean undo stack
+  InsertRowsCommand(TableModel* model,
+                    int startRow,
+                    QList<ModelItemValues> valueList,
+                    QUndoCommand* parent = nullptr);
+
+  /// QUndoCommand interface
+  void undo() override;
+  void redo() override;
+
+ private:
+  TableModel* m_tableModel;
+  const int m_startRow;
+  const QList<ModelItemValues> m_valueList;
+};
+
+#endif  // INSERTROWSCOMMAND_H

libs/GenericCore/model/commands/removerowscommand.cpp

@@ -0,0 +1,41 @@
+#include "removerowscommand.h"
+
+#include <QDebug>
+
+#include "../tablemodel.h"
+
+RemoveRowsCommand::RemoveRowsCommand(TableModel* model,
+                                     const int startRow,
+                                     const int nRows,
+                                     QUndoCommand* parent)
+    : QUndoCommand(parent)
+    , m_tableModel(model)
+    , m_startRow(startRow) {
+  qInfo() << "New RemoveCommand...";
+  const QString commandText =
+      QString("removing %1 item(s) on position %2").arg(nRows).arg(startRow);
+  setText(commandText);
+
+  for (int row = 0; row < nRows; ++row) {
+    const int rowPosition = startRow + row;
+    QModelIndex index     = m_tableModel->index(rowPosition, 0);
+
+    ModelItemValues values = m_tableModel->getItemValues(index);
+
+    m_valueList.append(values);
+  }
+}
+
+void RemoveRowsCommand::undo() {
+  qDebug() << "Undoing the RemoveCommand...";
+  if (m_tableModel) {
+    m_tableModel->execInsertItems(m_startRow, m_valueList);
+  }
+}
+
+void RemoveRowsCommand::redo() {
+  qDebug() << "(Re-)doing the RemoveCommand...";
+  if (m_tableModel) {
+    m_tableModel->execRemoveItems(m_startRow, m_valueList.length());
+  }
+}

libs/GenericCore/model/commands/removerowscommand.h

@@ -0,0 +1,30 @@
+#ifndef REMOVEROWSCOMMAND_H
+#define REMOVEROWSCOMMAND_H
+
+#include <QUndoCommand>
+
+class TableModel;
+
+typedef QMap<int, QVariant> ModelItemValues;
+
+class RemoveRowsCommand : public QUndoCommand {
+ public:
+  // TODO don't use simple pointer to model
+  /// Using simple pointer to model because there was a crash when closing the application with an
+  /// unclean undo stack
+  RemoveRowsCommand(TableModel* model,
+                    const int startRow,
+                    const int nRows,
+                    QUndoCommand* parent = nullptr);
+
+  /// QUndoCommand interface
+  void undo() override;
+  void redo() override;
+
+ private:
+  TableModel* m_tableModel;
+  const int m_startRow;
+  QList<ModelItemValues> m_valueList;
+};
+
+#endif  // REMOVEROWSCOMMAND_H

libs/GenericCore/model/generalsortfiltermodel.cpp

@@ -0,0 +1,105 @@
+#include "generalsortfiltermodel.h"
+#include "metadata.h"
+
+#include <QItemSelection>
+
+GeneralSortFilterModel::GeneralSortFilterModel(std::shared_ptr<TableModel> sourceModel)
+    : QSortFilterProxyModel{sourceModel.get()}
+    , m_tableModel(sourceModel) {
+  setSourceModel(sourceModel.get());
+
+  m_collator.setNumericMode(true);
+}
+
+QItemSelection GeneralSortFilterModel::findItems(const QString& text) const {
+  QItemSelection result;
+
+  for (int i = 0; i < rowCount(); ++i) {
+    const QModelIndex localIndex = index(i, 0);
+    if (indexContainsText(localIndex, text)) {
+      result.select(localIndex, index(i, columnCount() - 1));  /// select entire row
+    }
+  }
+  return result;
+}
+
+QString GeneralSortFilterModel::getUuid(const QModelIndex& itemIndex) const {
+  return data(itemIndex, IdRole).toString();
+}
+
+QByteArray GeneralSortFilterModel::jsonDataForServer(const QModelIndex& proxyIndex) {
+  const QModelIndex sourceIndex = mapToSource(proxyIndex);
+  return m_tableModel->jsonDataForServer(sourceIndex);
+}
+
+void GeneralSortFilterModel::appendItems(const QByteArray& jsonDoc) {
+  m_tableModel->appendItems(jsonDoc);
+}
+
+bool GeneralSortFilterModel::removeRows(int firstRow, int nRows, const QModelIndex& parentIndex) {
+  const QModelIndex proxyIndex  = index(firstRow, 0, parentIndex);
+  const QModelIndex sourceIndex = mapToSource(proxyIndex);
+  return m_tableModel->removeRows(sourceIndex.row(), nRows, sourceIndex.parent());
+}
+
+bool GeneralSortFilterModel::lessThan(const QModelIndex& source_left,
+                                      const QModelIndex& source_right) const {
+  if (source_left.column() != source_right.column()) {
+    return false;
+  }
+
+  QAbstractItemModel* localSourceModel = sourceModel();
+  const int role                       = GET_ROLE_FOR_COLUMN(source_left.column());
+  const QVariant leftData              = localSourceModel->data(source_left);
+  const QVariant rightData             = localSourceModel->data(source_right);
+
+  const bool isText = STRING_ROLES.contains(role);
+  if (isText) {
+    const QString leftString  = leftData.toString();
+    const QString rightString = rightData.toString();
+    return m_collator.compare(leftString, rightString) > 0;
+  }
+  const bool isInt = INT_ROLES.contains(role);
+  if (isInt) {
+    const int leftInt  = leftData.toInt();
+    const int rightInt = rightData.toInt();
+    return leftInt > rightInt;
+  }
+  const bool isDouble = DOUBLE_ROLES.contains(role);
+  if (isDouble) {
+    const int leftInt  = leftData.toDouble();
+    const int rightInt = rightData.toDouble();
+    return leftInt > rightInt;
+  }
+  return false;
+}
+
+bool GeneralSortFilterModel::indexContainsText(const QModelIndex& index,
+                                               const QString& text) const {
+  // iterate over USER_FACING_ROLES and call roleDataContainsText(...);
+  // ...for each until text is found or no more roles to check;
+  QListIterator<UserRoles> i(USER_FACING_ROLES);
+  while (i.hasNext()) {
+    const UserRoles role   = i.next();
+    const bool isTextFound = roleDataContainsText(index, role, text);
+    if (isTextFound) {
+      // qInfo() << "Text is found in role:" << role;
+      return true;
+      // } else {
+      //   qDebug() << QString("Can't find text in role %1. Continuing search...").arg(role);
+    }
+  }
+  // qWarning() << "Text not found in any role. Returning false...";
+  return false;
+}
+
+bool GeneralSortFilterModel::roleDataContainsText(const QModelIndex& index,
+                                                  const int role,
+                                                  const QString& text) const {
+  const QString dataString = index.data(role).toString();
+  if (dataString.contains(text, Qt::CaseInsensitive)) {
+    return true;
+  } else {
+    return false;
+  }
+}

libs/GenericCore/model/generalsortfiltermodel.h

@@ -0,0 +1,39 @@
+#ifndef GENERALSORTFILTERMODEL_H
+#define GENERALSORTFILTERMODEL_H
+
+#include <QCollator>
+#include <QSortFilterProxyModel>
+
+#include "tablemodel.h"
+
+class GeneralSortFilterModel : public QSortFilterProxyModel {
+  Q_OBJECT
+ public:
+  explicit GeneralSortFilterModel(std::shared_ptr<TableModel> sourceModel = nullptr);
+
+  /** Returns a QItemSelection with all ModelIndexes which contain the given text.
+   * @brief Returns QItemSelection containing all successful ModelIndex results
+   * @param text To search for
+   * @return QItemSelection containing all successful ModelIndex results
+   */
+  QItemSelection findItems(const QString& text) const;
+  QString getUuid(const QModelIndex& itemIndex) const;
+
+  QByteArray jsonDataForServer(const QModelIndex& proxyIndex);
+
+ public slots:
+  void appendItems(const QByteArray& jsonDoc);
+  bool removeRows(int firstRow, int nRows, const QModelIndex& parentIndex = QModelIndex()) override;
+  /// QSortFilterProxyModel interface
+ protected:
+  bool lessThan(const QModelIndex& sourceLeft, const QModelIndex& sourceRight) const override;
+
+ private:
+  std::shared_ptr<TableModel> m_tableModel;
+  QCollator m_collator;  /// for sorting
+
+  bool indexContainsText(const QModelIndex& index, const QString& text) const;
+  bool roleDataContainsText(const QModelIndex& index, const int role, const QString& text) const;
+};
+
+#endif  // GENERALSORTFILTERMODEL_H

libs/GenericCore/model/metadata.h

@@ -0,0 +1,77 @@
+#ifndef METADATA_H
+#define METADATA_H
+
+#include <QDebug>
+#include <QHash>
+#include <QList>
+#include <QString>
+
+// TODO add namespace
+
+/// model data
+enum UserRoles {
+  NameRole = Qt::UserRole + 1,
+  DescriptionRole,
+  InfoRole,
+  AmountRole,
+  FactorRole,
+  /// Non user facing
+  IdRole,
+  /// read only roles
+  ToStringRole,
+  ToJsonRole
+};
+
+static UserRoles DEFAULT_ROLE = NameRole;
+// TODO ?rename USER_FACING_ROLES -> MAIN_ROLES ?
+static QList<UserRoles> USER_FACING_ROLES = {NameRole, DescriptionRole, InfoRole, AmountRole,
+                                             FactorRole};
+static QHash<int, QByteArray> ROLE_NAMES  = {
+    {NameRole, "name"},     {DescriptionRole, "description"}, {InfoRole, "info"},
+    {AmountRole, "amount"}, {FactorRole, "factor"},           {ToStringRole, "ToString"},
+    {IdRole, "id"}};
+static QList<UserRoles> STRING_ROLES = {NameRole, DescriptionRole, InfoRole, IdRole};
+static QList<UserRoles> INT_ROLES    = {AmountRole};
+static QList<UserRoles> DOUBLE_ROLES = {FactorRole};
+
+/// JSON keys
+static const QString ITEMS_KEY_STRING = "items";
+static const QString ITEM_KEY_STRING  = "item";
+
+/// file naming
+static const QString ITEMS_FILE_NAME = ITEMS_KEY_STRING + ".json";
+
+/// functions
+static int GET_ROLE_FOR_COLUMN(const int column) {
+  switch (column) {
+    case 0:
+      return NameRole;
+      break;
+    case 1:
+      return DescriptionRole;
+      break;
+    case 2:
+      return InfoRole;
+      break;
+    case 3:
+      return AmountRole;
+      break;
+    case 4:
+      return FactorRole;
+      break;
+    default:
+      qWarning() << QString("No role found for column %1! Returning 'NameRole'...").arg(column);
+      return NameRole;
+      break;
+  }
+}
+static QList<QString> GET_HEADER_NAMES() {
+  QList<QString> result;
+  for (const UserRoles& role : USER_FACING_ROLES) {
+    const QString headerName = ROLE_NAMES.value(role);
+    result.append(headerName);
+  }
+  return result;
+}
+
+#endif  // METADATA_H

libs/GenericCore/model/modelitem.cpp

@@ -0,0 +1,94 @@
+#include "modelitem.h"
+
+#include "metadata.h"
+
+#include <QJsonObject>
+#include <QJsonValue>
+
+ModelItem::ModelItem(const ModelItemValues values)
+    : m_values(values) {}
+
+QVariant ModelItem::data(int role) const { return m_values.value(role); }
+
+bool ModelItem::setData(const QVariant& value, int role) {
+  bool valueChanged = false;
+  if (m_values.contains(role)) {
+    if (m_values.value(role) != value) {
+      valueChanged = true;
+    }
+  }
+  m_values[role] = value;
+
+  return valueChanged;
+}
+
+bool ModelItem::setItemData(const QMap<int, QVariant>& changedValues) {
+  bool valueChanged = false;
+
+  QMap<int, QVariant>::const_iterator citer = changedValues.constBegin();
+
+  while (citer != changedValues.constEnd()) {
+    const int role       = citer.key();
+    const QVariant value = citer.value();
+
+    if (m_values.contains(role)) {
+      if (m_values.value(role) != value) {
+        valueChanged = true;
+      }
+    }
+    m_values[role] = value;
+
+    citer++;
+  }
+
+  return valueChanged;
+}
+
+QString ModelItem::toString() const {
+  QString result;
+
+  QListIterator<UserRoles> i(USER_FACING_ROLES);
+  while (i.hasNext()) {
+    const UserRoles role   = i.next();
+    const QString roleName = ROLE_NAMES.value(role);
+    const QVariant value   = data(role);
+    // result.append(value.toString());
+    result.append(QString("%1: %2\n").arg(roleName, data(role).toString()));
+  }
+
+  const UserRoles idRole = IdRole;
+  QVariant idValue       = data(idRole);
+  if (!idValue.isNull()) {
+    const QString idRoleName = ROLE_NAMES.value(idRole);
+    result.append(QString("%1: %2\n").arg(idRoleName, idValue.toString()));
+  }
+  return result;
+}
+
+QJsonObject ModelItem::toJsonObject() const {
+  QJsonObject itemObject;
+  // TODO add UUID and dates (entry, modification, end)
+  const UserRoles idRole = IdRole;
+  QVariant idValue       = data(idRole);
+  if (!idValue.isNull()) {
+    const QString idRoleName = ROLE_NAMES.value(idRole);
+    itemObject.insert(idRoleName, idValue.toString());
+  }
+
+  QListIterator<UserRoles> i(USER_FACING_ROLES);
+  while (i.hasNext()) {
+    const UserRoles role   = i.next();
+    const QString roleName = ROLE_NAMES.value(role);
+    const QVariant value   = data(role);
+    if (STRING_ROLES.contains(role)) {
+      itemObject.insert(roleName, value.toString());
+    } else if (INT_ROLES.contains(role)) {
+      itemObject.insert(roleName, value.toInt());
+    } else if (DOUBLE_ROLES.contains(role)) {
+      itemObject.insert(roleName, value.toDouble());
+    } else {
+      qCritical() << QString("Cant find data type of role %1!!!").arg(role);
+    }
+  }
+  return itemObject;
+}

libs/GenericCore/model/modelitem.h

@@ -0,0 +1,24 @@
+#ifndef MODELITEM_H
+#define MODELITEM_H
+
+#include <QVariant>
+
+typedef QMap<int, QVariant> ModelItemValues;
+
+class ModelItem {
+ public:
+  ModelItem(const ModelItemValues values);
+
+  QVariant data(int role) const;
+  bool setData(const QVariant& value, int role);
+  // TODO change return value to list of changed roles
+  bool setItemData(const QMap<int, QVariant>& changedValues);
+
+  QString toString() const;
+  QJsonObject toJsonObject() const;
+
+ private:
+  ModelItemValues m_values;
+};
+
+#endif  // MODELITEM_H

libs/GenericCore/model/tablemodel.cpp

@@ -0,0 +1,390 @@
+#include "tablemodel.h"
+
+#include "../formats/jsonparser.h"
+#include "commands/edititemcommand.h"
+#include "commands/insertrowscommand.h"
+#include "commands/removerowscommand.h"
+#include "metadata.h"
+#include "modelitem.h"
+
+#include <QJsonArray>
+#include <QJsonDocument>
+#include <QJsonObject>
+
+QByteArray TableModel::generateExampleItems() {
+  QJsonDocument doc = QJsonDocument();
+  QJsonObject rootObject;
+  QJsonArray array;
+
+  // TODO use JsonParser for the item generation
+  for (int row = 0; row < 5; ++row) {
+    QJsonObject itemObject;
+    //  itemObject.insert("uuid", m_uuid.toString());
+    //  itemObject.insert("entryDateUTC", m_entryDateUTC.toString(Qt::ISODate));
+    itemObject.insert(ROLE_NAMES.value(NameRole), QString("Item %1").arg(row));
+    itemObject.insert(ROLE_NAMES.value(DescriptionRole), QString("This is item %1").arg(row));
+    itemObject.insert(ROLE_NAMES.value(InfoRole), QString("Info of item %1").arg(row));
+    itemObject.insert(ROLE_NAMES.value(AmountRole), row);
+    itemObject.insert(ROLE_NAMES.value(FactorRole), row * 1.1);
+
+    array.append(itemObject);
+  }
+  rootObject.insert(ITEMS_KEY_STRING, array);
+
+  doc.setObject(rootObject);
+  return doc.toJson();
+}
+
+TableModel::TableModel(QUndoStack* undoStack, QObject* parent)
+    : QAbstractTableModel{parent}
+    , m_undoStack(undoStack) {}
+
+Qt::ItemFlags TableModel::flags(const QModelIndex& index) const {
+  if (!index.isValid()) {
+    return QAbstractTableModel::flags(index);
+  }
+  return Qt::ItemIsEditable | QAbstractTableModel::flags(index);
+}
+
+QHash<int, QByteArray> TableModel::roleNames() const { return ROLE_NAMES; }
+
+int TableModel::rowCount(const QModelIndex& parent) const {
+  if (parent.isValid()) {
+    return 0;  /// no children
+  }
+  return m_items.size();
+}
+
+int TableModel::columnCount(const QModelIndex& parent) const {
+  if (parent.isValid()) {
+    return 0;  /// no children
+  }
+  return USER_FACING_ROLES.size();
+}
+
+QVariant TableModel::data(const QModelIndex& index, int role) const {
+  const int row    = index.row();
+  const int column = index.column();
+
+  if (!index.isValid()) {
+    return QVariant();
+  }
+  if (row >= rowCount(QModelIndex()) || column >= columnCount(QModelIndex())) {
+    return QVariant();
+  }
+
+  int roleForColumn = GET_ROLE_FOR_COLUMN(column);
+  switch (role) {
+    case Qt::DisplayRole:
+    case Qt::EditRole:
+      return m_items.at(row)->data(roleForColumn);
+    case NameRole:
+    case DescriptionRole:
+    case InfoRole:
+    case AmountRole:
+    case FactorRole:
+    case IdRole:
+      return m_items.at(row)->data(role);
+    case ToStringRole:
+      return m_items.at(row)->toString();
+    case ToJsonRole:
+      return m_items.at(row)->toJsonObject();
+  }
+
+  return QVariant();
+}
+
+QVariant TableModel::headerData(int section, Qt::Orientation orientation, int role) const {
+  if (role == Qt::DisplayRole) {
+    if (orientation == Qt::Horizontal) {
+      const int columnRole     = GET_ROLE_FOR_COLUMN(section);
+      const QString headerName = ROLE_NAMES.value(columnRole);
+      return QString("%1").arg(headerName);
+    } else {
+      return QString("%1").arg(section);
+    }
+  }
+  return QVariant();
+}
+
+bool TableModel::setData(const QModelIndex& index, const QVariant& value, int role) {
+  if (role == Qt::EditRole && checkIndex(index)) {
+    const int column        = index.column();
+    const int roleForColumn = GET_ROLE_FOR_COLUMN(column);
+    return setItemData(index, {{roleForColumn, value}});
+  }
+  return false;
+}
+
+bool TableModel::setItemData(const QModelIndex& index, const QMap<int, QVariant>& roles) {
+  if (!checkIndex(index)) {
+    return false;
+  }
+  // if (isRoleReadOnly(roleForColumn)) {
+  //   return false;
+  // }
+
+  QMap<int, QVariant> changedValues = onlyChangedValues(index, roles);
+  if (changedValues.size() > 0) {
+    EditItemCommand* editCommand = new EditItemCommand(this, index, changedValues);
+    m_undoStack->push(editCommand);
+    return true;
+  }
+  return false;
+}
+
+ModelItemValues TableModel::getItemValues(const QModelIndex& index) const {
+  ModelItemValues values;
+
+  QListIterator<UserRoles> i(USER_FACING_ROLES);
+  while (i.hasNext()) {
+    const UserRoles role = i.next();
+    values.insert(role, data(index, role));
+  }
+  return values;
+}
+
+QJsonDocument TableModel::getAllItemsAsJsonDoc() const {
+  QJsonDocument doc = QJsonDocument();
+  QJsonObject rootObject;
+  QJsonArray array;
+
+  foreach (shared_ptr<ModelItem> item, m_items) {
+    QJsonObject itemObject = item->toJsonObject();
+    array.append(itemObject);
+  }
+  rootObject.insert(ITEMS_KEY_STRING, array);
+
+  doc.setObject(rootObject);
+  return doc;
+}
+
+QList<QStringList> TableModel::getItemsAsStringLists() const {
+  QList<QStringList> result;
+  foreach (shared_ptr<ModelItem> item, m_items) {
+    QStringList valueList;
+    for (int column = 0; column < columnCount(); ++column) {
+      QString value = item->data(GET_ROLE_FOR_COLUMN(column)).toString();
+      valueList.append(value);
+    }
+    result.append(valueList);
+  }
+  return result;
+}
+
+// TODO use item selection as parameter to wrap multiple items into JSON data structure
+QByteArray TableModel::jsonDataForServer(const QModelIndex& currentIndex) const {
+  const QJsonObject itemObject = data(currentIndex, ToJsonRole).toJsonObject();
+  QJsonObject rootObject;
+  rootObject.insert(ITEM_KEY_STRING, itemObject);
+  const QJsonDocument jsonDoc(rootObject);
+  return jsonDoc.toJson(QJsonDocument::Compact);
+}
+
+QString TableModel::updateItemsFromJson(const QByteArray& jsonData) {
+  const QList<ModelItemValues> valueList = JsonParser::toItemValuesList(jsonData, ITEM_KEY_STRING);
+  int nChangedItems                      = 0;
+  for (const ModelItemValues& itemValues : valueList) {
+    bool updateHappened = updateItem(itemValues);
+    if (updateHappened) {
+      nChangedItems++;
+    }
+  }
+  return QString("Found and updated %1 item(s).").arg(nChangedItems);
+}
+
+bool TableModel::updateItem(const ModelItemValues& itemValues) {
+  QModelIndex foundIndex = searchItemIndex(itemValues);
+
+  qDebug() << "Search done!";
+  if (foundIndex == QModelIndex()) {
+    const QString errorMessage = "No matching item found!";
+    qWarning() << errorMessage;
+    return false;
+  } else {
+    qInfo() << "Item found!";
+    /// update existing item
+    setItemData(foundIndex, itemValues);
+    return true;
+  }
+}
+
+bool TableModel::removeRows(int firstRow, int nRows, const QModelIndex& parentIndex) {
+  if (parentIndex != QModelIndex()) {
+    qWarning() << "Removing of child rows is not supported yet!";
+    return false;
+  }
+
+  const int lastRow = firstRow + nRows - 1;
+  if (firstRow < 0 || lastRow >= m_items.size()) {
+    qWarning() << "Trying to remove rows is out of bounds!";
+    return false;
+  }
+
+  RemoveRowsCommand* removeCommand = new RemoveRowsCommand(this, firstRow, nRows);
+  m_undoStack->push(removeCommand);
+
+  return true;
+}
+
+void TableModel::appendItems(const QByteArray& jsonDoc) { insertItems(-1, jsonDoc, QModelIndex()); }
+
+void TableModel::insertItems(int startPosition,
+                             const QByteArray& jsonDoc,
+                             const QModelIndex& parentIndex) {
+  const QList<ModelItemValues> valueList = JsonParser::toItemValuesList(jsonDoc, ITEMS_KEY_STRING);
+
+  if (valueList.empty()) {
+    /// don't try inserting if no values to insert
+    qDebug() << "No items found in JSON document. Not adding anything...";
+    return;
+  }
+
+  insertItems(startPosition, valueList, parentIndex);
+}
+
+void TableModel::insertItems(int startPosition,
+                             const QList<ModelItemValues>& itemValuesList,
+                             const QModelIndex& parentIndex) {
+  qInfo() << "Inserting item(s) into model...";
+  if (parentIndex != QModelIndex()) {
+    qWarning()
+        << "Using invalid parent index (no child support for now)! Using root index as parent...";
+  }
+  if (startPosition == -1 || startPosition > m_items.size()) {
+    /// Appending item(s)
+    startPosition = m_items.size();
+  }
+
+  InsertRowsCommand* insertCommand = new InsertRowsCommand(this, startPosition, itemValuesList);
+  m_undoStack->push(insertCommand);
+}
+
+void TableModel::execInsertItems(const int firstRow, const QList<ModelItemValues> valueList) {
+  const int nRows = valueList.size();
+  qDebug() << "Inserting" << nRows << "items...";
+
+  const int lastRow = firstRow + nRows - 1;
+  beginInsertRows(QModelIndex(), firstRow, lastRow);
+  for (int row = 0; row < nRows; ++row) {
+    const int rowPosition      = firstRow + row;
+    shared_ptr<ModelItem> item = make_unique<ModelItem>(valueList.at(row));
+    m_items.insert(rowPosition, std::move(item));
+  }
+  endInsertRows();
+}
+
+void TableModel::execRemoveItems(const int firstRow, const int nRows) {
+  const int lastRow = firstRow + nRows - 1;
+  beginRemoveRows(QModelIndex(), firstRow, lastRow);
+  m_items.remove(firstRow, nRows);
+  endRemoveRows();
+}
+
+void TableModel::execEditItemData(const int row, const QMap<int, QVariant>& changedValues) {
+  shared_ptr<ModelItem> item = m_items.at(row);
+  bool isDataChanged         = item->setItemData(changedValues);
+
+  if (isDataChanged) {
+    /// FIXME due to the mapping from roles to the DisplayRole of different columns the complete row
+    /// is getting notified about (potential) data changes; dataChanged should be called only for
+    /// the affected columns
+    const QModelIndex firstIndex = this->index(row, 0);
+    const QModelIndex lastIndex  = this->index(row, USER_FACING_ROLES.size() - 1);
+    QList<int> roles             = changedValues.keys();
+    roles.insert(0, Qt::DisplayRole);
+    emit dataChanged(firstIndex, lastIndex, roles.toVector());
+  }
+}
+
+QMap<int, QVariant> TableModel::onlyChangedValues(const QModelIndex& index,
+                                                  const QMap<int, QVariant>& roleValueMap) const {
+  QMap<int, QVariant> result;
+  QMap<int, QVariant>::const_iterator i;
+  for (i = roleValueMap.constBegin(); i != roleValueMap.constEnd(); ++i) {
+    const int role          = i.key();
+    const QVariant newValue = i.value();
+    const QVariant oldValue = index.data(role);
+    // TODO check if role is a editable role?
+    if (oldValue != newValue) {
+      bool emptyValueIsEqualToZero = isEmptyValueEqualToZero(role);
+      if (emptyValueIsEqualToZero && oldValue == QVariant() && newValue == 0) {
+        qDebug() << "oldValue:" << oldValue << "& newValue:" << newValue
+                 << "mean the same. Ignoring...";
+        continue;
+      }
+      qDebug() << "oldValue:" << oldValue << "!= newValue:" << newValue;
+      result.insert(role, newValue);
+    } else {
+      qInfo() << "oldValue is already the same as newValue:" << oldValue << "-> ignoring...";
+    }
+  }
+  return result;
+}
+
+bool TableModel::isEmptyValueEqualToZero(const int role) const {
+  if (INT_ROLES.contains(role)) {
+    return true;
+  } else if (DOUBLE_ROLES.contains(role)) {
+    return true;
+  } else {
+    return false;
+  }
+}
+
+QModelIndex TableModel::searchItemIndex(const ModelItemValues givenItemValues) const {
+  // iterate over indexes to search item : see searchItem(...);
+  // for (const shared_ptr<ModelItem>& item : m_items) {
+  for (int row = 0; row < rowCount(); ++row) {
+    qDebug() << "Processing item at row" << row << "...";
+    QModelIndex itemIndex = index(row, 0);
+    if (isItemEqualToItemValues(itemIndex, givenItemValues)) {
+      qInfo() << "Found item at row" << row << "! Returning its index...";
+      return itemIndex;
+    }
+  }
+  qDebug() << "No matching item found. Returning empty pointer...";
+  return {};
+}
+
+bool TableModel::isItemEqualToItemValues(const QModelIndex& itemIndex,
+                                         const ModelItemValues givenItemValues) const {
+  /// do both have a UUID?
+  QVariant idOfItem = data(itemIndex, IdRole);
+  QVariant given    = givenItemValues.value(IdRole);
+  if (idOfItem.isValid() && given.isValid()) {
+    /// are the UUIDs the same?
+    if (idOfItem.toString() == given.toString()) {
+      qInfo() << "UUIDs are the same.";
+      return true;
+    } else {
+      qDebug() << "UUIDs are NOT the same.";
+      return false;
+    }
+  } else {
+    /// are all other values the same? (for now only USER_FACING_ROLES are checked)
+    QListIterator<UserRoles> i(USER_FACING_ROLES);
+    while (i.hasNext()) {
+      const UserRoles role       = i.next();
+      const QString roleName     = ROLE_NAMES.value(role);
+      const QVariant valueOfItem = data(itemIndex, role);
+      const QVariant givenValue  = givenItemValues.value(role);
+      if (STRING_ROLES.contains(role)) {
+        if (valueOfItem.toString() != givenValue.toString()) {
+          return false;
+        }
+      } else if (INT_ROLES.contains(role)) {
+        if (valueOfItem.toInt() != givenValue.toInt()) {
+          return false;
+        }
+      } else if (DOUBLE_ROLES.contains(role)) {
+        if (valueOfItem.toDouble() != givenValue.toDouble()) {
+          return false;
+        }
+      } else {
+        qCritical() << QString("Can't find data type for role %1!!!").arg(role);
+      }
+    }
+    return true;
+  }
+}

libs/GenericCore/model/tablemodel.h

@@ -0,0 +1,79 @@
+#ifndef TABLEMODEL_H
+#define TABLEMODEL_H
+
+#include <QAbstractTableModel>
+
+class QUndoStack;
+class ModelItem;
+
+using namespace std;
+
+typedef QMap<int, QVariant> ModelItemValues;
+
+class TableModel : public QAbstractTableModel {
+  Q_OBJECT
+
+  friend class InsertRowsCommand;
+  friend class RemoveRowsCommand;
+  friend class EditItemCommand;
+
+ public:
+  static QByteArray generateExampleItems();
+
+  explicit TableModel(QUndoStack* undoStack, QObject* parent = nullptr);
+
+  /// QAbstractItemModel interface
+  Qt::ItemFlags flags(const QModelIndex& index) const override;
+  QHash<int, QByteArray> roleNames() const override;
+
+  int rowCount(const QModelIndex& parent = QModelIndex()) const override;
+  int columnCount(const QModelIndex& parent = QModelIndex()) const override;
+  QVariant data(const QModelIndex& index, int role) const override;
+  QVariant headerData(int section, Qt::Orientation orientation, int role) const override;
+
+  bool setData(const QModelIndex& index, const QVariant& value, int role) override;
+  bool setItemData(const QModelIndex& index, const QMap<int, QVariant>& roles) override;
+
+  ModelItemValues getItemValues(const QModelIndex& index) const;
+  QJsonDocument getAllItemsAsJsonDoc() const;
+  QList<QStringList> getItemsAsStringLists() const;
+
+  QByteArray jsonDataForServer(const QModelIndex& currentIndex) const;
+
+  QString updateItemsFromJson(const QByteArray& jsonData);
+  bool updateItem(const ModelItemValues& itemValues);
+
+ public slots:
+  // bool insertRows(int position, int rows, const QModelIndex& parentIndex = QModelIndex())
+  // override;
+  bool removeRows(int firstRow, int nRows, const QModelIndex& parentIndex = QModelIndex()) override;
+  void appendItems(const QByteArray& jsonDoc);
+  void insertItems(int startPosition,
+                   const QByteArray& jsonDoc,
+                   const QModelIndex& parentIndex = QModelIndex());
+  void insertItems(int startPosition,
+                   const QList<ModelItemValues>& itemValuesList,
+                   const QModelIndex& parentIndex = QModelIndex());
+
+ private:
+  /// *** members ***
+  // TODO shared_ptr -> unique_ptr
+  QList<shared_ptr<ModelItem>> m_items;
+  QUndoStack* m_undoStack;
+
+  /// *** functions ***
+  /// undo/redo functions
+  void execInsertItems(const int firstRow, const QList<ModelItemValues> valueList);
+  void execRemoveItems(const int firstRow, const int nRows);
+  void execEditItemData(const int row, const QMap<int, QVariant>& changedValues);
+
+  /// misc functions
+  QMap<int, QVariant> onlyChangedValues(const QModelIndex& index,
+                                        const QMap<int, QVariant>& roleValueMap) const;
+  bool isEmptyValueEqualToZero(const int role) const;
+  QModelIndex searchItemIndex(const ModelItemValues givenItemValues) const;
+  bool isItemEqualToItemValues(const QModelIndex& itemIndex,
+                               const ModelItemValues givenItemValues) const;
+};
+
+#endif  // TABLEMODEL_H