/**
* @return all the id Sequences that are missing from this set that are not in between the range
* provided.
*/
public List<Sequence> getMissing(long first, long last) {
ArrayList<Sequence> rc = new ArrayList<Sequence>();
if (first > last) {
throw new IllegalArgumentException("First cannot be more than last");
}
if (isEmpty()) {
// We are missing all the messages.
rc.add(new Sequence(first, last));
return rc;
}
Sequence sequence = getHead();
while (sequence != null && first <= last) {
if (sequence.contains(first)) {
first = sequence.last + 1;
} else {
if (first < sequence.first) {
if (last < sequence.first) {
rc.add(new Sequence(first, last));
return rc;
} else {
rc.add(new Sequence(first, sequence.first - 1));
first = sequence.last + 1;
}
}
}
sequence = sequence.getNext();
}
if (first <= last) {
rc.add(new Sequence(first, last));
}
return rc;
}
/**
* Removes the given value from the Sequence set, splitting a contained sequence if necessary.
*
* @param value The value that should be removed from the SequenceSet.
* @return true if the value was removed from the set, false if there was no sequence in the set
* that contained the given value.
*/
public boolean remove(long value) {
Sequence sequence = getHead();
while (sequence != null) {
if (sequence.contains(value)) {
if (sequence.range() == 1) {
sequence.unlink();
return true;
} else if (sequence.getFirst() == value) {
sequence.setFirst(value + 1);
return true;
} else if (sequence.getLast() == value) {
sequence.setLast(value - 1);
return true;
} else {
sequence.linkBefore(new Sequence(sequence.first, value - 1));
sequence.linkAfter(new Sequence(value + 1, sequence.last));
sequence.unlink();
return true;
}
}
sequence = sequence.getNext();
}
return false;
}
public SequenceSet deepCopy(SequenceSet value) {
SequenceSet rc = new SequenceSet();
Sequence sequence = value.getHead();
while (sequence != null) {
rc.add(new Sequence(sequence.first, sequence.last));
sequence = sequence.getNext();
}
return rc;
}
/**
* Computes the size of this Sequence by summing the values of all the contained sequences.
*
* @return the total number of values contained in this set if it were to be iterated over like an
* array.
*/
public long rangeSize() {
long result = 0;
Sequence sequence = getHead();
while (sequence != null) {
result += sequence.range();
sequence = sequence.getNext();
}
return result;
}
/** @return all the Sequence that are in this list */
public List<Sequence> getReceived() {
ArrayList<Sequence> rc = new ArrayList<Sequence>(size());
Sequence sequence = getHead();
while (sequence != null) {
rc.add(new Sequence(sequence.first, sequence.last));
sequence = sequence.getNext();
}
return rc;
}
public Long next() {
if (currentEntry == null) {
throw new NoSuchElementException();
}
if (lastReturned < currentEntry.first) {
lastReturned = currentEntry.first;
if (currentEntry.range() == 1) {
currentEntry = currentEntry.getNext();
}
} else {
lastReturned++;
if (lastReturned == currentEntry.last) {
currentEntry = currentEntry.getNext();
}
}
return lastReturned;
}
public boolean contains(int first, int last) {
if (isEmpty()) {
return false;
}
Sequence sequence = getHead();
while (sequence != null) {
if (sequence.first <= first && first <= sequence.last) {
return last <= sequence.last;
}
sequence = sequence.getNext();
}
return false;
}
public void writePayload(SequenceSet value, DataOutput out) throws IOException {
out.writeInt(value.size());
Sequence sequence = value.getHead();
while (sequence != null) {
if (sequence.range() > 1) {
out.writeBoolean(true);
out.writeLong(sequence.first);
out.writeLong(sequence.last);
} else {
out.writeBoolean(false);
out.writeLong(sequence.first);
}
sequence = sequence.getNext();
}
}
/**
* Returns true if the value given is contained within one of the sequences held in this set.
*
* @param value The value to search for in the set.
* @return true if the value is contained in the set.
*/
public boolean contains(long value) {
if (isEmpty()) {
return false;
}
Sequence sequence = getHead();
while (sequence != null) {
if (sequence.contains(value)) {
return true;
}
sequence = sequence.getNext();
}
return false;
}
/**
* Removes and returns the first sequence that is count range large.
*
* @return a sequence that is count range large, or null if no sequence is that large in the list.
*/
public Sequence removeFirstSequence(long count) {
if (isEmpty()) {
return null;
}
Sequence sequence = getHead();
while (sequence != null) {
if (sequence.range() == count) {
sequence.unlink();
return sequence;
}
if (sequence.range() > count) {
Sequence rc = new Sequence(sequence.first, sequence.first + count - 1);
sequence.first += count;
return rc;
}
sequence = sequence.getNext();
}
return null;
}
/**
* @param value the value to add to the list
* @return false if the value was a duplicate.
*/
public boolean add(long value) {
if (isEmpty()) {
addFirst(new Sequence(value));
return true;
}
// check for append
Sequence sequence = getTail();
if (sequence.isAdjacentToLast(value)) {
sequence.last = value;
return true;
}
sequence = getHead();
while (sequence != null) {
if (sequence.isAdjacentToLast(value)) {
// grow the sequence...
sequence.last = value;
// it might connect us to the next sequence..
if (sequence.getNext() != null) {
Sequence next = sequence.getNext();
if (next.isAdjacentToFirst(value)) {
// Yep the sequence connected.. so join them.
sequence.last = next.last;
next.unlink();
}
}
return true;
}
if (sequence.isAdjacentToFirst(value)) {
// grow the sequence...
sequence.first = value;
// it might connect us to the previous
if (sequence.getPrevious() != null) {
Sequence prev = sequence.getPrevious();
if (prev.isAdjacentToLast(value)) {
// Yep the sequence connected.. so join them.
sequence.first = prev.first;
prev.unlink();
}
}
return true;
}
// Did that value land before this sequence?
if (value < sequence.first) {
// Then insert a new entry before this sequence item.
sequence.linkBefore(new Sequence(value));
return true;
}
// Did that value land within the sequence? The it's a duplicate.
if (sequence.contains(value)) {
return false;
}
sequence = sequence.getNext();
}
// Then the value is getting appended to the tail of the sequence.
addLast(new Sequence(value));
return true;
}