/**
* This method takes an object in its original state, and returns a new copy of the object with
* the changes embodied in this DBObjectDeltaRec applied to it.
*/
public DBObject applyDelta(DBObject original) {
if (!original.getInvid().equals(invid)) {
throw new IllegalArgumentException("Error, object identity mismatch");
}
/* - */
DBObject copy;
fieldDeltaRec fieldRec;
Object value;
/* -- */
copy = new DBObject(original, null);
// now process the fieldDeltaRec's.
for (int i = 0; i < fieldRecs.size(); i++) {
fieldRec = (fieldDeltaRec) fieldRecs.elementAt(i);
// are we clearing this field?
if (!fieldRec.vector && fieldRec.scalarValue == null) {
copy.clearField(fieldRec.fieldcode);
continue;
}
// are we doing a replace or add?
if (!fieldRec.vector) {
fieldRec.scalarValue.setOwner(copy);
if (copy.getField(fieldRec.fieldcode) != null) {
copy.replaceField(fieldRec.scalarValue);
} else {
copy.addField(fieldRec.scalarValue);
}
continue;
}
// ok, we must be doing a vector mod
// remember that we are intentionally bypassing the DBField's
// add/remove logic, as we assume that this DBObjectDeltaRec
// was generated as a result of a properly checked operation.
// Also, since we know that only string, invid, and IP fields
// can be vectors, we don't have to worry about the password
// and permission matrix special-case logic.
DBField field = copy.retrieveField(fieldRec.fieldcode);
if (fieldRec.addValues != null) {
for (int j = 0; j < fieldRec.addValues.size(); j++) {
value = fieldRec.addValues.elementAt(j);
if (value instanceof IPwrap) {
value = ((IPwrap) value).address;
}
field.getVectVal().addElement(value);
}
}
if (fieldRec.delValues != null) {
for (int j = 0; j < fieldRec.delValues.size(); j++) {
value = fieldRec.delValues.elementAt(j);
if (value instanceof IPwrap) {
value = ((IPwrap) value).address;
}
field.getVectVal().removeElement(value);
}
}
}
return copy;
}
