// need to evict the areas covered by this feature
NodeCursor cc = new NodeCursor(getRootNode(), shape);
NodeIdentifier next = null;
int cnt = 0;
while ((next = cc.getNext()) != null) {
Node n = readNode(next);
cnt += n.getDataCount();
n.clear();
writeNode(n);
getStatistics().addToEvictionCounter(1);
}
getStatistics().addToDataCounter(-cnt);
return;