/** Remove a CacheEntry from linked list */
protected void removeEntry(CacheEntry entry) {
if (entry == _first) {
_first = entry._next;
}
if (_last == entry) {
_last = entry._previous;
}
CacheEntry previous = entry._previous;
CacheEntry next = entry._next;
if (previous != null) {
previous._next = next;
}
if (next != null) {
next._previous = previous;
}
entry._previous = null;
entry._next = null;
}
/** Add a CacheEntry. Entry goes at the end of the list. */
protected void addEntry(CacheEntry entry) {
if (_first == null) {
_first = entry;
_last = entry;
} else {
_last._next = entry;
entry._previous = _last;
_last = entry;
}
}