> subranges;
-
- /**
- * Constructor given a list of things that are each located on a contiguous
- * interval. Note that the constructor may reorder the list.
- *
- * We assume here that for each range, start <= end. Behaviour for reverse
- * ordered ranges is undefined.
- *
- * @param ranges
- */
- public NCList(List ranges)
- {
- this();
- build(ranges);
- }
-
- /**
- * Sort and group ranges into sublists where each sublist represents a region
- * and its contained subregions
- *
- * @param ranges
- */
- protected void build(List ranges)
- {
- /*
- * sort by start ascending so that contained intervals
- * follow their containing interval
- */
- Collections.sort(ranges, RangeComparator.BY_START_POSITION);
-
- List sublists = buildSubranges(ranges);
-
- /*
- * convert each subrange to an NCNode consisting of a range and
- * (possibly) its contained NCList
- */
- for (Range sublist : sublists)
- {
- subranges.add(new NCNode(ranges.subList(sublist.start,
- sublist.end + 1)));
- }
-
- size = ranges.size();
- }
-
- public NCList(T entry)
- {
- this();
- subranges.add(new NCNode<>(entry));
- size = 1;
- }
-
- public NCList()
- {
- subranges = new ArrayList>();
- }
-
- /**
- * Traverses the sorted ranges to identify sublists, within which each
- * interval contains the one that follows it
- *
- * @param ranges
- * @return
- */
- protected List buildSubranges(List ranges)
- {
- List sublists = new ArrayList<>();
-
- if (ranges.isEmpty())
- {
- return sublists;
- }
-
- int listStartIndex = 0;
- long lastEndPos = Long.MAX_VALUE;
-
- for (int i = 0; i < ranges.size(); i++)
- {
- ContiguousI nextInterval = ranges.get(i);
- long nextStart = nextInterval.getBegin();
- long nextEnd = nextInterval.getEnd();
- if (nextStart > lastEndPos || nextEnd > lastEndPos)
- {
- /*
- * this interval is not contained in the preceding one
- * close off the last sublist
- */
- sublists.add(new Range(listStartIndex, i - 1));
- listStartIndex = i;
- }
- lastEndPos = nextEnd;
- }
-
- sublists.add(new Range(listStartIndex, ranges.size() - 1));
- return sublists;
- }
-
- /**
- * Adds one entry to the stored set (with duplicates allowed)
- *
- * @param entry
- */
- public void add(T entry)
- {
- add(entry, true);
- }
-
- /**
- * Adds one entry to the stored set, and returns true, unless allowDuplicates
- * is set to false and it is already contained (by object equality test), in
- * which case it is not added and this method returns false.
- *
- * @param entry
- * @param allowDuplicates
- * @return
- */
- public synchronized boolean add(T entry, boolean allowDuplicates)
- {
- if (!allowDuplicates && contains(entry))
- {
- return false;
- }
-
- size++;
- long start = entry.getBegin();
- long end = entry.getEnd();
-
- /*
- * cases:
- * - precedes all subranges: add as NCNode on front of list
- * - follows all subranges: add as NCNode on end of list
- * - enclosed by a subrange - add recursively to subrange
- * - encloses one or more subranges - push them inside it
- * - none of the above - add as a new node and resort nodes list (?)
- */
-
- /*
- * find the first subrange whose end does not precede entry's start
- */
- int candidateIndex = findFirstOverlap(start);
- if (candidateIndex == -1)
- {
- /*
- * all subranges precede this one - add it on the end
- */
- subranges.add(new NCNode<>(entry));
- return true;
- }
-
- /*
- * search for maximal span of subranges i-k that the new entry
- * encloses; or a subrange that encloses the new entry
- */
- boolean enclosing = false;
- int firstEnclosed = 0;
- int lastEnclosed = 0;
- boolean overlapping = false;
-
- for (int j = candidateIndex; j < subranges.size(); j++)
- {
- NCNode subrange = subranges.get(j);
-
- if (end < subrange.getBegin() && !overlapping && !enclosing)
- {
- /*
- * new entry lies between subranges j-1 j
- */
- subranges.add(j, new NCNode<>(entry));
- return true;
- }
-
- if (subrange.getBegin() <= start && subrange.getEnd() >= end)
- {
- /*
- * push new entry inside this subrange as it encloses it
- */
- subrange.add(entry);
- return true;
- }
-
- if (start <= subrange.getBegin())
- {
- if (end >= subrange.getEnd())
- {
- /*
- * new entry encloses this subrange (and possibly preceding ones);
- * continue to find the maximal list it encloses
- */
- if (!enclosing)
- {
- firstEnclosed = j;
- }
- lastEnclosed = j;
- enclosing = true;
- continue;
- }
- else
- {
- /*
- * entry spans from before this subrange to inside it
- */
- if (enclosing)
- {
- /*
- * entry encloses one or more preceding subranges
- */
- addEnclosingRange(entry, firstEnclosed, lastEnclosed);
- return true;
- }
- else
- {
- /*
- * entry spans two subranges but doesn't enclose any
- * so just add it
- */
- subranges.add(j, new NCNode<>(entry));
- return true;
- }
- }
- }
- else
- {
- overlapping = true;
- }
- }
-
- /*
- * drops through to here if new range encloses all others
- * or overlaps the last one
- */
- if (enclosing)
- {
- addEnclosingRange(entry, firstEnclosed, lastEnclosed);
- }
- else
- {
- subranges.add(new NCNode<>(entry));
- }
-
- return true;
- }
-
- /**
- * Answers true if this NCList contains the given entry (by object equality
- * test), else false
- *
- * @param entry
- * @return
- */
- public boolean contains(T entry)
- {
- /*
- * find the first sublist that might overlap, i.e.
- * the first whose end position is >= from
- */
- int candidateIndex = findFirstOverlap(entry.getBegin());
-
- if (candidateIndex == -1)
- {
- return false;
- }
-
- int to = entry.getEnd();
-
- for (int i = candidateIndex; i < subranges.size(); i++)
- {
- NCNode candidate = subranges.get(i);
- if (candidate.getBegin() > to)
- {
- /*
- * we are past the end of our target range
- */
- break;
- }
- if (candidate.contains(entry))
- {
- return true;
- }
- }
- return false;
- }
-
- /**
- * Update the tree so that the range of the new entry encloses subranges i to
- * j (inclusive). That is, replace subranges i-j (inclusive) with a new
- * subrange that contains them.
- *
- * @param entry
- * @param i
- * @param j
- */
- protected synchronized void addEnclosingRange(T entry, final int i,
- final int j)
- {
- NCList newNCList = new NCList<>();
- newNCList.addNodes(subranges.subList(i, j + 1));
- NCNode newNode = new NCNode<>(entry, newNCList);
- for (int k = j; k >= i; k--)
- {
- subranges.remove(k);
- }
- subranges.add(i, newNode);
- }
-
- protected void addNodes(List> nodes)
- {
- for (NCNode node : nodes)
- {
- subranges.add(node);
- size += node.size();
- }
- }
-
- /**
- * Returns a (possibly empty) list of items whose extent overlaps the given
- * range
- *
- * @param from
- * start of overlap range (inclusive)
- * @param to
- * end of overlap range (inclusive)
- * @return
- */
- public List findOverlaps(long from, long to)
- {
- List result = new ArrayList<>();
-
- findOverlaps(from, to, result);
-
- return result;
- }
-
- /**
- * Recursively searches the NCList adding any items that overlap the from-to
- * range to the result list
- *
- * @param from
- * @param to
- * @param result
- */
- protected void findOverlaps(long from, long to, List result)
- {
- /*
- * find the first sublist that might overlap, i.e.
- * the first whose end position is >= from
- */
- int candidateIndex = findFirstOverlap(from);
-
- if (candidateIndex == -1)
- {
- return;
- }
-
- for (int i = candidateIndex; i < subranges.size(); i++)
- {
- NCNode candidate = subranges.get(i);
- if (candidate.getBegin() > to)
- {
- /*
- * we are past the end of our target range
- */
- break;
- }
- candidate.findOverlaps(from, to, result);
- }
-
- }
-
- /**
- * Search subranges for the first one whose end position is not before the
- * target range's start position, i.e. the first one that may overlap the
- * target range. Returns the index in the list of the first such range found,
- * or -1 if none found.
- *
- * @param from
- * @return
- */
- protected int findFirstOverlap(long from)
- {
- /*
- * The NCList paper describes binary search for this step,
- * but this not implemented here as (a) I haven't understood it yet
- * and (b) it seems to imply complications for adding to an NCList
- */
-
- int i = 0;
- if (subranges != null)
- {
- for (NCNode subrange : subranges)
- {
- if (subrange.getEnd() >= from)
- {
- return i;
- }
- i++;
- }
- }
- return -1;
- }
-
- /**
- * Formats the tree as a bracketed list e.g.
- *
- *
- * [1-100 [10-30 [10-20]], 15-30 [20-20]]
- *
- */
- @Override
- public String toString()
- {
- return subranges.toString();
- }
-
- /**
- * Returns a string representation of the data where containment is shown by
- * indentation on new lines
- *
- * @return
- */
- public String prettyPrint()
- {
- StringBuilder sb = new StringBuilder(512);
- int offset = 0;
- int indent = 2;
- prettyPrint(sb, offset, indent);
- sb.append(System.lineSeparator());
- return sb.toString();
- }
-
- /**
- * @param sb
- * @param offset
- * @param indent
- */
- void prettyPrint(StringBuilder sb, int offset, int indent)
- {
- boolean first = true;
- for (NCNode subrange : subranges)
- {
- if (!first)
- {
- sb.append(System.lineSeparator());
- }
- first = false;
- subrange.prettyPrint(sb, offset, indent);
- }
- }
-
- /**
- * Answers true if the data held satisfy the rules of construction of an
- * NCList, else false.
- *
- * @return
- */
- public boolean isValid()
- {
- return isValid(Integer.MIN_VALUE, Integer.MAX_VALUE);
- }
-
- /**
- * Answers true if the data held satisfy the rules of construction of an
- * NCList bounded within the given start-end range, else false.
- *
- * Each subrange must lie within start-end (inclusive). Subranges must be
- * ordered by start position ascending.
- *
- *
- * @param start
- * @param end
- * @return
- */
- boolean isValid(final int start, final int end)
- {
- int lastStart = start;
- for (NCNode subrange : subranges)
- {
- if (subrange.getBegin() < lastStart)
- {
- System.err.println("error in NCList: range " + subrange.toString()
- + " starts before " + lastStart);
- return false;
- }
- if (subrange.getEnd() > end)
- {
- System.err.println("error in NCList: range " + subrange.toString()
- + " ends after " + end);
- return false;
- }
- lastStart = subrange.getBegin();
-
- if (!subrange.isValid())
- {
- return false;
- }
- }
- return true;
- }
-
- /**
- * Answers the lowest start position enclosed by the ranges
- *
- * @return
- */
- public int getStart()
- {
- return subranges.isEmpty() ? 0 : subranges.get(0).getBegin();
- }
-
- /**
- * Returns the number of ranges held (deep count)
- *
- * @return
- */
- public int size()
- {
- return size;
- }
-
- /**
- * Returns a list of all entries stored
- *
- * @return
- */
- public List getEntries()
- {
- List result = new ArrayList<>();
- getEntries(result);
- return result;
- }
-
- /**
- * Adds all contained entries to the given list
- *
- * @param result
- */
- void getEntries(List result)
- {
- for (NCNode subrange : subranges)
- {
- subrange.getEntries(result);
- }
- }
-
- /**
- * Deletes the given entry from the store, returning true if it was found (and
- * deleted), else false. This method makes no assumption that the entry is in
- * the 'expected' place in the store, in case it has been modified since it
- * was added. Only the first 'same object' match is deleted, not 'equal' or
- * multiple objects.
- *
- * @param entry
- */
- public synchronized boolean delete(T entry)
- {
- if (entry == null)
- {
- return false;
- }
- for (int i = 0; i < subranges.size(); i++)
- {
- NCNode subrange = subranges.get(i);
- NCList subRegions = subrange.getSubRegions();
-
- if (subrange.getRegion() == entry)
- {
- /*
- * if the subrange is rooted on this entry, promote its
- * subregions (if any) to replace the subrange here;
- * NB have to resort subranges after doing this since e.g.
- * [10-30 [12-20 [16-18], 13-19]]
- * after deleting 12-20, 16-18 is promoted to sibling of 13-19
- * but should follow it in the list of subranges of 10-30
- */
- subranges.remove(i);
- if (subRegions != null)
- {
- subranges.addAll(subRegions.subranges);
- Collections.sort(subranges, RangeComparator.BY_START_POSITION);
- }
- size--;
- return true;
- }
- else
- {
- if (subRegions != null && subRegions.delete(entry))
- {
- size--;
- subrange.deleteSubRegionsIfEmpty();
- return true;
- }
- }
- }
- return false;
- }
-}