+ std::pair<WhiteboardOperation::ref, WhiteboardOperation::ref> WhiteboardTransformer::transform(WhiteboardOperation::ref clientOp, WhiteboardOperation::ref serverOp) {

+ WhiteboardInsertOperation::ref clientInsert = boost::dynamic_pointer_cast<WhiteboardInsertOperation>(clientOp);

+ WhiteboardInsertOperation::ref serverInsert = boost::dynamic_pointer_cast<WhiteboardInsertOperation>(serverOp);

+ WhiteboardUpdateOperation::ref clientUpdate = boost::dynamic_pointer_cast<WhiteboardUpdateOperation>(clientOp);

+ WhiteboardUpdateOperation::ref serverUpdate = boost::dynamic_pointer_cast<WhiteboardUpdateOperation>(serverOp);

+ WhiteboardDeleteOperation::ref clientDelete = boost::dynamic_pointer_cast<WhiteboardDeleteOperation>(clientOp);

+ WhiteboardDeleteOperation::ref serverDelete = boost::dynamic_pointer_cast<WhiteboardDeleteOperation>(serverOp);

+ if (clientInsert && serverInsert) {

+ return transform(clientInsert, serverInsert);

+ } else if (clientUpdate && serverUpdate) {

+ return transform(clientUpdate, serverUpdate);

+ } else if (clientInsert && serverUpdate) {

+ return transform(clientInsert, serverUpdate);

+ } else if (clientUpdate && serverInsert) {

+ return transform(clientUpdate, serverInsert);

+ } else if (clientDelete && serverDelete) {

+ return transform(clientDelete, serverDelete);

+ } else if (clientInsert && serverDelete) {

+ return transform(clientInsert, serverDelete);

+ } else if (clientDelete && serverInsert) {

+ return transform(clientDelete, serverInsert);

+ } else if (clientUpdate && serverDelete) {

+ return transform(clientUpdate, serverDelete);

+ } else if (clientDelete && serverUpdate) {

+ return transform(clientDelete, serverUpdate);

+ } else {

+ return std::pair<WhiteboardOperation::ref, WhiteboardOperation::ref>();

+ }

+ }

+

+ std::pair<WhiteboardOperation::ref, WhiteboardOperation::ref> WhiteboardTransformer::transform(WhiteboardInsertOperation::ref clientOp, WhiteboardInsertOperation::ref serverOp) {

+ std::pair<WhiteboardInsertOperation::ref, WhiteboardInsertOperation::ref> result;

+ result.first = boost::make_shared<WhiteboardInsertOperation>(*serverOp);

+ result.first->setParentID(clientOp->getID());

+ result.second = boost::make_shared<WhiteboardInsertOperation>(*clientOp);

+ result.second->setParentID(serverOp->getID());

+ if (clientOp->getPos() <= serverOp->getPos()) {

+ result.first->setPos(result.first->getPos()+1);

+ } else {

+ result.second->setPos(result.second->getPos()+1);

+ }

+ return result;

+ }

+

+ std::pair<WhiteboardOperation::ref, WhiteboardOperation::ref> WhiteboardTransformer::transform(WhiteboardUpdateOperation::ref clientOp, WhiteboardUpdateOperation::ref serverOp) {

+ std::pair<WhiteboardUpdateOperation::ref, WhiteboardUpdateOperation::ref> result;

+ result.first = boost::make_shared<WhiteboardUpdateOperation>(*serverOp);

+ result.first->setParentID(clientOp->getID());

+

+ if (clientOp->getPos() == serverOp->getPos()) {

+ result.second = boost::make_shared<WhiteboardUpdateOperation>(*serverOp);

+ result.second->setID(clientOp->getID());

+ result.second->setParentID(serverOp->getID());

+ } else {

+ result.second = boost::make_shared<WhiteboardUpdateOperation>(*clientOp);

+ result.second->setParentID(serverOp->getID());

+ }

+

+ if (clientOp->getPos() < serverOp->getPos() && clientOp->getNewPos() > serverOp->getPos()) {

+ result.first->setPos(result.first->getPos()-1);

+ if (clientOp->getNewPos() >= serverOp->getNewPos()) {

+ result.first->setNewPos(result.first->getNewPos()-1);

+ }

+ } else if (clientOp->getNewPos() >= serverOp->getNewPos()) {

+ result.first->setNewPos(result.first->getNewPos()-1);

+ }

+

+ if (serverOp->getPos() < clientOp->getPos() && serverOp->getNewPos() > clientOp->getPos()) {

+ result.second->setPos(result.second->getPos()-1);

+ if (serverOp->getNewPos() >= clientOp->getNewPos()) {

+ result.second->setNewPos(result.second->getNewPos()-1);

+ }

+ } else if (serverOp->getNewPos() >= clientOp->getNewPos()) {

+ result.second->setNewPos(result.second->getNewPos()-1);

+ }

+ return result;

+ }

+

+ std::pair<WhiteboardOperation::ref, WhiteboardOperation::ref> WhiteboardTransformer::transform(WhiteboardUpdateOperation::ref clientOp, WhiteboardInsertOperation::ref serverOp) {

+ std::pair<WhiteboardInsertOperation::ref, WhiteboardUpdateOperation::ref> result;

+ result.first = boost::make_shared<WhiteboardInsertOperation>(*serverOp);

+ result.first->setParentID(clientOp->getID());

+ result.second = boost::make_shared<WhiteboardUpdateOperation>(*clientOp);

+ result.second->setParentID(serverOp->getID());

+ if (serverOp->getPos() <= clientOp->getPos()) {

+ result.second->setPos(result.second->getPos()+1);

+ }

+ return result;

+ }

+

+ std::pair<WhiteboardOperation::ref, WhiteboardOperation::ref> WhiteboardTransformer::transform(WhiteboardInsertOperation::ref clientOp, WhiteboardUpdateOperation::ref serverOp) {

+ std::pair<WhiteboardUpdateOperation::ref, WhiteboardInsertOperation::ref> result;

+ result.first = boost::make_shared<WhiteboardUpdateOperation>(*serverOp);

+ result.first->setParentID(clientOp->getID());

+ result.second = boost::make_shared<WhiteboardInsertOperation>(*clientOp);

+ result.second->setParentID(serverOp->getID());

+ if (serverOp->getPos() >= clientOp->getPos()) {

+ result.first->setPos(result.first->getPos()+1);

+ }

+ return result;

+ }

+

+ std::pair<WhiteboardOperation::ref, WhiteboardOperation::ref> WhiteboardTransformer::transform(WhiteboardDeleteOperation::ref clientOp, WhiteboardDeleteOperation::ref serverOp) {

+ std::pair<WhiteboardDeleteOperation::ref, WhiteboardDeleteOperation::ref> result;

+ result.first = boost::make_shared<WhiteboardDeleteOperation>(*serverOp);

+ result.first->setParentID(clientOp->getID());

+ result.second = boost::make_shared<WhiteboardDeleteOperation>(*clientOp);

+ result.second->setParentID(serverOp->getID());

+ if (clientOp->getPos() == -1) {

+ result.second->setPos(-1);

+ }

+ if (serverOp->getPos() == -1) {

+ result.first->setPos(-1);

+ }

+ if (clientOp->getPos() < serverOp->getPos()) {

+ result.first->setPos(result.first->getPos()-1);

+ } else if (clientOp->getPos() > serverOp->getPos()) {

+ result.second->setPos(result.second->getPos()-1);

+ } else {

+ result.first->setPos(-1);

+ result.second->setPos(-1);

+ }

+ return result;

+ }

+

+ std::pair<WhiteboardOperation::ref, WhiteboardOperation::ref> WhiteboardTransformer::transform(WhiteboardInsertOperation::ref clientOp, WhiteboardDeleteOperation::ref serverOp) {

+ std::pair<WhiteboardDeleteOperation::ref, WhiteboardInsertOperation::ref> result;

+ result.first = boost::make_shared<WhiteboardDeleteOperation>(*serverOp);

+ result.first->setParentID(clientOp->getID());

+ result.second = boost::make_shared<WhiteboardInsertOperation>(*clientOp);

+ result.second->setParentID(serverOp->getID());

+ if (clientOp->getPos() <= serverOp->getPos()) {

+ result.first->setPos(result.first->getPos()+1);

+ } else if (serverOp->getPos() != -1) {

+ result.second->setPos(result.second->getPos()-1);

+ }

+ return result;

+ }

+

+ std::pair<WhiteboardOperation::ref, WhiteboardOperation::ref> WhiteboardTransformer::transform(WhiteboardDeleteOperation::ref clientOp, WhiteboardInsertOperation::ref serverOp) {

+ std::pair<WhiteboardInsertOperation::ref, WhiteboardDeleteOperation::ref> result;

+ result.first = boost::make_shared<WhiteboardInsertOperation>(*serverOp);

+ result.first->setParentID(clientOp->getID());

+ result.second = boost::make_shared<WhiteboardDeleteOperation>(*clientOp);

+ result.second->setParentID(serverOp->getID());

+ if (serverOp->getPos() <= clientOp->getPos()) {

+ result.second->setPos(result.second->getPos()+1);

+ } else if (clientOp->getPos() != -1) {

+ result.first->setPos(result.first->getPos()-1);

+ }

+ return result;

+ }

+

+ std::pair<WhiteboardOperation::ref, WhiteboardOperation::ref> WhiteboardTransformer::transform(WhiteboardUpdateOperation::ref clientOp, WhiteboardDeleteOperation::ref serverOp) {

+ std::pair<WhiteboardDeleteOperation::ref, WhiteboardOperation::ref> result;

+ result.first = boost::make_shared<WhiteboardDeleteOperation>(*serverOp);

+ result.first->setParentID(clientOp->getID());

+ WhiteboardUpdateOperation::ref updateOp = boost::make_shared<WhiteboardUpdateOperation>(*clientOp);

+ result.second = updateOp;

+ result.second->setParentID(serverOp->getID());

+ if (clientOp->getPos() == serverOp->getPos()) {

+ WhiteboardDeleteOperation::ref deleteOp = boost::make_shared<WhiteboardDeleteOperation>();

+ result.second = deleteOp;

+ result.second->setPos(-1);

+ result.second->setID(clientOp->getID());

+ result.second->setParentID(serverOp->getID());

+ deleteOp->setElementID(serverOp->getElementID());

+ } else if (clientOp->getPos() > serverOp->getPos() && clientOp->getNewPos() <= serverOp->getPos()) {

+ result.second->setPos(result.second->getPos()-1);

+ } else if (clientOp->getPos() < serverOp->getPos() && clientOp->getNewPos() >= serverOp->getPos()) {

+ updateOp->setNewPos(updateOp->getNewPos()-1);

+ } else if (clientOp->getPos() > serverOp->getPos()) {

+ result.second->setPos(result.second->getPos()-1);

+ updateOp->setNewPos(updateOp->getNewPos()-1);

+ }

+ return result;

+ }

+

+ std::pair<WhiteboardOperation::ref, WhiteboardOperation::ref> WhiteboardTransformer::transform(WhiteboardDeleteOperation::ref clientOp, WhiteboardUpdateOperation::ref serverOp) {

+ std::pair<WhiteboardOperation::ref, WhiteboardDeleteOperation::ref> result;

+ WhiteboardUpdateOperation::ref updateOp = boost::make_shared<WhiteboardUpdateOperation>(*serverOp);

+ result.first = updateOp;

+ result.first->setParentID(clientOp->getID());

+ result.second = boost::make_shared<WhiteboardDeleteOperation>(*clientOp);

+ result.second->setParentID(serverOp->getID());

+ if (clientOp->getPos() == serverOp->getPos()) {

+ WhiteboardDeleteOperation::ref deleteOp = boost::make_shared<WhiteboardDeleteOperation>();

+ result.first = deleteOp;

+ result.first->setPos(-1);

+ result.first->setID(serverOp->getID());

+ result.first->setParentID(clientOp->getID());

+ deleteOp->setElementID(clientOp->getElementID());

+ } else if (clientOp->getPos() < serverOp->getPos() && clientOp->getPos() >= serverOp->getNewPos()) {

+ result.first->setPos(result.first->getPos()-1);

+ } else if (clientOp->getPos() > serverOp->getPos() && clientOp->getPos() <= serverOp->getNewPos()) {

+ updateOp->setNewPos(updateOp->getNewPos()-1);

+ } else if (clientOp->getPos() < serverOp->getPos()) {

+ result.first->setPos(result.first->getPos()-1);

+ updateOp->setNewPos(updateOp->getNewPos()-1);

+ }

+ return result;

+ }