+package jalview.datamodel;
+
+/**
+ * helper class to compute min/max/mean for a range on a contact list
+ *
+ * @author jprocter
+ *
+ */
+public class ContactListImpl implements ContactListI
+{
+ ContactListProviderI clist;
+
+
+ public static ContactListI newContactList(ContactListProviderI list)
+ {
+ return new ContactListImpl(list);
+ }
+
+ public ContactListImpl(ContactListProviderI list)
+ {
+ clist = list;
+ }
+
+ @Override
+ public double getContactAt(int column)
+ {
+ return clist.getContactAt(column);
+ }
+
+ @Override
+ public int getContactHeight()
+ {
+ return clist.getContactHeight();
+ }
+
+ @Override
+ public ContactRange getRangeFor(int from_column, int to_column)
+ {
+ if (clist instanceof ContactListI)
+ {
+ // clist may implement getRangeFor in a more efficient way, so use theirs
+ return ((ContactListI) clist).getRangeFor(from_column, to_column);
+ }
+ if (from_column < 0)
+ {
+ from_column = 0;
+ }
+ if (to_column > getContactHeight())
+ {
+ to_column = getContactHeight();
+ }
+ ContactRange cr = new ContactRange();
+ cr.setFrom_column(from_column);
+ cr.setTo_column(to_column);
+ double tot = 0;
+ for (int i = from_column; i < to_column; i++)
+ {
+ double contact = getContactAt(i);
+ tot += contact;
+ if (i == from_column)
+ {
+ cr.setMin(contact);
+ cr.setMax(contact);
+ cr.setMinPos(i);
+ cr.setMaxPos(i);
+ }
+ else
+ {
+ if (cr.getMax() < contact)
+ {
+ cr.setMax(contact);
+ cr.setMaxPos(i);
+ }
+ if (cr.getMin() < contact)
+ {
+ cr.setMin(contact);
+ cr.setMinPos(i);
+ }
+ }
+ }
+ if (tot > 0)
+ {
+ cr.setMean(tot / (to_column - from_column));
+ }
+ else
+ {
+ cr.setMean(tot);
+ }
+ return cr;
+ }
+
+}