/**
* Build a list of {@link ContentProviderOperation} that will transform all the "before" {@link
* Entity} states into the modified state which all {@link EntityDelta} objects represent. This
* method specifically creates any {@link AggregationExceptions} rules needed to groups edits
* together.
*/
public ArrayList<ContentProviderOperation> buildDiff() {
final ArrayList<ContentProviderOperation> diff = Lists.newArrayList();
final long rawContactId = this.findRawContactId();
int firstInsertRow = -1;
// First pass enforces versions remain consistent
for (EntityDelta delta : this) {
delta.buildAssert(diff);
}
final int assertMark = diff.size();
int backRefs[] = new int[size()];
int rawContactIndex = 0;
// Second pass builds actual operations
for (EntityDelta delta : this) {
final int firstBatch = diff.size();
backRefs[rawContactIndex++] = firstBatch;
delta.buildDiff(diff);
// Only create rules for inserts
if (!delta.isContactInsert()) continue;
// If we are going to split all contacts, there is no point in first combining them
if (mSplitRawContacts) continue;
if (rawContactId != -1) {
// Has existing contact, so bind to it strongly
final Builder builder = beginKeepTogether();
builder.withValue(AggregationExceptions.RAW_CONTACT_ID1, rawContactId);
builder.withValueBackReference(AggregationExceptions.RAW_CONTACT_ID2, firstBatch);
diff.add(builder.build());
} else if (firstInsertRow == -1) {
// First insert case, so record row
firstInsertRow = firstBatch;
} else {
// Additional insert case, so point at first insert
final Builder builder = beginKeepTogether();
builder.withValueBackReference(AggregationExceptions.RAW_CONTACT_ID1, firstInsertRow);
builder.withValueBackReference(AggregationExceptions.RAW_CONTACT_ID2, firstBatch);
diff.add(builder.build());
}
}
if (mSplitRawContacts) {
buildSplitContactDiff(diff, backRefs);
}
// No real changes if only left with asserts
if (diff.size() == assertMark) {
diff.clear();
}
return diff;
}
