+ setContext(ctx);
+ this.isDefined = defined;
+ }
+
+ /**
+ * Sets the alignment or group context for this group
+ *
+ * @param ctx
+ * the context for the group
+ * @throws IllegalArgumentException
+ * if setting the context would result in a circular reference chain
+ */
+ public void setContext(AnnotatedCollectionI ctx)
+ {
+ AnnotatedCollectionI ref = ctx;
+ while (ref != null)
+ {
+ if (ref == this || ref.getContext() == ctx)
+ {
+ throw new IllegalArgumentException(
+ "Circular reference in SequenceGroup.context");
+ }
+ ref = ref.getContext();
+ }
+ this.context = ctx;