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package tim.prune.function.sew;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import tim.prune.data.DataPoint;
import tim.prune.data.Track;
/**
* A chain of segments
*/
public class SegmentChain
{
private final ArrayList<Segment> _segments = new ArrayList<>();
private final Track _track;
/**
* Constructor
* @param inFirstSegment first segment of chain
*/
public SegmentChain(Track inTrack, Segment inFirstSegment) {
_segments.add(inFirstSegment);
_track = inTrack;
}
private DataPoint getFirstPoint() {
return _track.getPoint(_segments.get(0).getStartIndex());
}
private DataPoint getLastPoint() {
return _track.getPoint(_segments.get(_segments.size()-1).getEndIndex());
}
private boolean arePointsSame(DataPoint inFirst, DataPoint inSecond)
{
return inFirst.getLatitude().equals(inSecond.getLatitude())
&& inFirst.getLongitude().equals(inSecond.getLongitude());
}
public boolean append(Segment inNextSegment)
{
DataPoint chainStart = getFirstPoint();
DataPoint chainEnd = getLastPoint();
for (int i=0; i<2; i++)
{
DataPoint segmentStart = _track.getPoint(inNextSegment.getStartIndex());
if (arePointsSame(chainEnd, segmentStart))
{
_segments.add(inNextSegment);
return true;
}
DataPoint segmentEnd = _track.getPoint(inNextSegment.getEndIndex());
if (arePointsSame(chainStart, segmentEnd))
{
_segments.add(0, inNextSegment);
return true;
}
inNextSegment.reverse();
}
return false;
}
/**
* Reverse the whole chain
*/
private void reverse()
{
for (Segment segment : _segments) {
segment.reverse();
}
Collections.reverse(_segments);
}
/**
* Try to add another chain to this one
* @param inOther other chain
* @return true if successful, other one is now redundant
*/
public boolean append(SegmentChain inOther)
{
DataPoint chainStart = getFirstPoint();
DataPoint chainEnd = getLastPoint();
for (int i=0; i<2; i++)
{
DataPoint segmentStart = inOther.getFirstPoint();
if (arePointsSame(chainEnd, segmentStart))
{
_segments.addAll(inOther._segments);
return true;
}
DataPoint segmentEnd = inOther.getLastPoint();
if (arePointsSame(chainStart, segmentEnd))
{
_segments.addAll(0, inOther._segments);
return true;
}
inOther.reverse();
}
return false;
}
/**
* @return the point indices of this chain in order
*/
public List<Integer> getPointIndexes()
{
ArrayList<Integer> result = new ArrayList<>();
for (Segment segment : _segments) {
result.addAll(segment.getPointIndexes(result.isEmpty()));
}
return result;
}
}
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