protected Operation transform(InsertOperation insA, DeleteOperation delB) {
int posA = insA.getPosition();
int posB = delB.getPosition();
int lenB = delB.getTextLength();
if (posA <= posB) {
/*
* Operation A starts before or at the same position like operation
*/
return insA;
} else if (posA > (posB + lenB)) {
/*
* Operation A starts after operation B. Index of operation A' must
* be reduced by the length of the text of operation B.
*/
return new InsertOperation(posA - lenB, insA.getText(), insA.getOrigin());
} else {
/*
* Operation A starts in operation B. Index of A' must be the index
* of operation B.
*/
return new InsertOperation(posB, insA.getText(), insA.getOrigin());
}
}
protected Operation transform(
InsertOperation insA, InsertOperation insB, boolean isTransformPrivileged) {
int posA = insA.getPosition();
int posB = insB.getPosition();
int lenB = insB.getTextLength();
if ((posA < posB)
|| ((posA == posB) && (insA.getOrigin() < insB.getOrigin()))
|| ((posA == posB) && (insA.getOrigin() == insB.getOrigin()) && isTransformPrivileged)) {
/*
* Operation A starts before operation B.
*/
return insA;
} else {
/*
* Operation A starts in or behind operation B. Index of operation
* A' must be increased by the length of the text of operation B.
*/
return new InsertOperation(posA + lenB, insA.getText(), insA.getOrigin());
}
}