Method isExternal

src/figtree/treeviewer/ReRootedTree.java:320–325

@param node the node @return true if the node is of degree 1.

(Node node)

     * @return true if the node is of degree 1.
     */
    public boolean isExternal(Node node) {
        if (!(node instanceof ReRootedNode)) {
            throw new IllegalArgumentException("Node, " + node.toString() + " is not an instance of SimpleRootedNode.  It is an instance of "+node.getClass().getName());
        }
        return ((ReRootedNode)node).getChildren().size() == 0;
    }

    /**
     * @param taxon the taxon