public int compare(Declaration d1, Declaration d2) {
if (equals(d1, d2)) return 0;
SourcePosition p1 = d1.getPosition();
SourcePosition p2 = d2.getPosition();
if (p1 == null && p2 != null) return 1;
else if (p1 != null && p2 == null) return -1;
else if (p1 == null && p2 == null) return compareEqualPosition(d1, d2);
else {
assert p1 != null && p2 != null;
int fileComp = p1.file().compareTo(p2.file());
if (fileComp == 0) {
long diff = (long) p1.line() - (long) p2.line();
if (diff == 0) {
diff = Long.signum((long) p1.column() - (long) p2.column());
if (diff != 0) return (int) diff;
else {
// declarations may be two
// compiler-generated members with the
// same source position
return compareEqualPosition(d1, d2);
}
} else return (diff < 0) ? -1 : 1;
} else return fileComp;
}
}
