+
+ /**
+ * flyweight access to positions in the alignment annotation row for RNA
+ * processing
+ *
+ * @author jimp
+ *
+ */
+ private class AnnotCharSequence implements CharSequence
+ {
+ int offset = 0;
+
+ int max = 0;
+
+ public AnnotCharSequence()
+ {
+ this(0, annotations.length);
+ }
+
+ public AnnotCharSequence(int start, int end)
+ {
+ offset = start;
+ max = end;
+ }
+
+ @Override
+ public CharSequence subSequence(int start, int end)
+ {
+ return new AnnotCharSequence(offset + start, offset + end);
+ }
+
+ @Override
+ public int length()
+ {
+ return max - offset;
+ }
+
+ @Override
+ public char charAt(int index)
+ {
+ String dc;
+ return ((index + offset < 0) || (index + offset) >= max
+ || annotations[index + offset] == null || (dc = annotations[index
+ + offset].displayCharacter.trim()).length() < 1) ? '.' : dc
+ .charAt(0);
+ }
+
+ public String toString()
+ {
+ char[] string = new char[max - offset];
+ int mx = annotations.length;
+
+ for (int i = offset; i < mx; i++)
+ {
+ String dc;
+ string[i] = (annotations[i] == null || (dc = annotations[i].displayCharacter
+ .trim()).length() < 1) ? '.' : dc.charAt(0);
+ }
+ return new String(string);
+ }
+ };
+
+ private long _lastrnaannot = -1;
+
+ public String getRNAStruc()
+ {
+ if (isrna)
+ {
+ String rnastruc = new AnnotCharSequence().toString();
+ if (_lastrnaannot != rnastruc.hashCode())
+ {
+ // ensure rna structure contacts are up to date
+ _lastrnaannot = rnastruc.hashCode();
+ _updateRnaSecStr(rnastruc);
+ }
+ return rnastruc;
+ }
+ return null;
+ }
+