public Operation IT_DeleteDelete(Operation op1, Operation op2) {
if (op1.getPosition() < op2.getPosition()) return op1;
else if (op1.getPosition() > op2.getPosition()) {
op1.setPosition(op1.getPosition() - op2.getObj().getLength());
return op1;
} else {
op1.setIdentity(true);
return op1;
}
/* String-Wise
*
if (op2.getPosition() >= op1.getPosition() + op1.getObj().getLength())
return op1;
else if (op1.getPosition() >= op2.getPosition() + op2.getObj().getLength()){
//Delete (L(op1, P(op1) - L(op1))
return op1;
}
else{
if (op2.getPosition() <= op1.getPosition() && (op1.getPosition() + op1.getObj().getLength() <= op2.getPosition() + op2.getObj().getLength()))
//Delete (0, L(op1))
return null;
else if (op2.getPosition() <= op1.getPosition() && (op1.getPosition() + op1.getObj().getLength() > op2.getPosition() + op2.getObj().getLength())){
//Delete (P(op1) + L(op1) - (P(op2) + L(op2)), P(op2))
return op1;
}
else if (op2.getPosition() > op1.getPosition() && (op1.getPosition() + op1.getObj().getLength() <= op2.getPosition() + op2.getObj().getLength())){
//Delete (P(op2) - P(op1), P(op1))
return op1;
}
else{
//Delete (L(op1) - L(op2), P(op1))
return op1;
}
}*/
}
/**
* (see) Page 27 Direccionamiento de Datos & OT FAQ <br>
* Conditions: op2 has already been executed, op1 has not and its parameters are from the state
* before op2 was executed op1 is executed as if op2 was executed so its included
*/
@Override
public Operation transform(Operation op1, Operation op2) {
// TODO Auto-generated method stub
Operation opAux = op1.cloneOperation();
if (!op2.isIdentity()) opAux.setIdentity(op1.getIdentity());
if (opAux.isInsert() && op2.isInsert()) {
return IT_InsertInsert(opAux, op2);
} else if (opAux.isInsert() && op2.isDelete()) {
return IT_InsertDelete(opAux, op2);
} else if (opAux.isDelete() && op2.isInsert()) {
return IT_DeleteInsert(opAux, op2);
} else if (opAux.isDelete() && op2.isDelete()) {
return IT_DeleteDelete(opAux, op2);
}
return null;
}
