line(content, " " + clazz + " existing = null;");
line(content, " synchronized(" + lower + "Map) {");
line(content, " existing = (" + clazz + ")" + lower + "Map.get(" + signature[1] + ");");
line(content, " " + clazz + " existing = null;");
line(content, " synchronized(" + lower + "Map) {");
line(content, " existing = (" + clazz + ")" + lower + "Map.get(" + signature[1] + ");");