/*
* Put the separator function of a Bucket buck
* into the BucketTree beyond the current
* active_bucket.
*/
private void insert(Bucket buck) {
int i, index;
Bucket b;
if (buck.separator == null) return;
for (i = active_bucket; i < bucket_tree.length; i++) {
// Get the index for current Bucket's variable.
index = bucket_tree[i].variable.get_index();
// If separator contains a variable in the current Bucket, then join buckets.
if (buck.separator.memberOf(index)) {
// Add separator to bucket.
bucket_tree[i].discrete_functions.addElement(buck.separator);
// Update the non_conditioning variables.
// Go through the non-conditioning variables in the inserted Bucket.
for (Enumeration e = buck.non_conditioning_variables.elements(); e.hasMoreElements(); )
bucket_tree[i].non_conditioning_variables.addElement(e.nextElement());
// Take the inserted Bucket variable out by making it CONDITIONING:
// Must take the variable out as it has been eliminated already.
bucket_tree[i].non_conditioning_variables.removeElement(buck.variable);
// Mark parent/child relationship.
buck.child = bucket_tree[i];
bucket_tree[i].parents.addElement(buck);
return;
}
}
}
/**
* Create a cursor reading data from timestamp onwards. If timestamp is before the first message
* then the cursor reads starting at the first message. If timestamp is past the last message then
* the cursor will return false until more messages appear in the file.
*/
@SuppressWarnings("StatementWithEmptyBody")
public MessageCursor cursorByTimestamp(long timestamp) throws IOException {
int i = findBucketByTimestamp(timestamp);
if (i < 0) return new Cursor(firstMessageId);
// the first message with timestamp >= the time we are looking for may be in a previous bucket
// because
// the bucket timestamp resolution is only ms so go back until we get a change in time .. that
// way we
// are sure to find it
Bucket b = getBucket(i);
for (; b.getTimestamp() == timestamp && i > 0; b = getBucket(--i)) ;
Cursor c = new Cursor(getBucket(i).getFirstMessageId());
for (; c.next(); ) { // skip messages until we get one >= timestamp
if (c.getTimestamp() >= timestamp) {
c.unget();
break;
}
}
return c;
}