/**
* Searches for an item that matches the given pattern. The AbstractAutoCompleteAdaptor is used to
* access the candidate items. The match is case-sensitive and will only match at the beginning of
* each item's string representation.
*
* @param pattern the pattern that should be matched
* @return the first item that matches the pattern or <code>null</code> if no item matches
*/
private LookupResult lookupItem(String pattern) {
Object selectedItem = adaptor.getSelectedItem();
String[] possibleStrings;
// iterate over all items to find an exact match
for (int i = 0, n = adaptor.getItemCount(); i < n; i++) {
Object currentItem = adaptor.getItem(i);
possibleStrings = stringConverter.getPossibleStringsForItem(currentItem);
if (possibleStrings != null) {
// current item exactly matches the pattern?
for (int j = 0; j < possibleStrings.length; j++) {
if (possibleStrings[j].equals(pattern)) {
return new LookupResult(currentItem, possibleStrings[j]);
}
}
}
}
// check if the currently selected item matches
possibleStrings = stringConverter.getPossibleStringsForItem(selectedItem);
if (possibleStrings != null) {
for (int i = 0; i < possibleStrings.length; i++) {
if (startsWith(possibleStrings[i], pattern)) {
return new LookupResult(selectedItem, possibleStrings[i]);
}
}
}
// search for any matching item, if the currently selected does not match
for (int i = 0, n = adaptor.getItemCount(); i < n; i++) {
Object currentItem = adaptor.getItem(i);
possibleStrings = stringConverter.getPossibleStringsForItem(currentItem);
if (possibleStrings != null) {
for (int j = 0; j < possibleStrings.length; j++) {
if (startsWith(possibleStrings[j], pattern)) {
return new LookupResult(currentItem, possibleStrings[j]);
}
}
}
}
// no item starts with the pattern => return null
return new LookupResult(null, "");
}
