public PhysicsLink findLink(String linkName) {
        PhysicsLink link;
        if (linkName.startsWith("Bone:")) {
            String boneName = linkName.substring(5);
            link = findBoneLink(boneName);
        } else {
            assert linkName.equals("Torso:");
            link = torsoLink;
        }

        return link;
    }
Access the named link. Returns null if the name is invalid, or if the
control is not added to a spatial.

@param linkName the name of the link (not null, not empty)
@return the pre-existing link, or null if not found
jme3-jbullet/src/main/java/com/jme3/bullet/animation/DacLinks.java