protected void addTags( PAG pag ) {
final Tag unknown = new StringTag( "Untagged Spark node" );
final Map<Node, Tag> nodeToTag = pag.getNodeTags();
for( Iterator cIt = Scene.v().getClasses().iterator(); cIt.hasNext(); ) {
final SootClass c = (SootClass) cIt.next();
for( Iterator mIt = c.methodIterator(); mIt.hasNext(); ) {
SootMethod m = (SootMethod) mIt.next();
if( !m.isConcrete() ) continue;
if( !m.hasActiveBody() ) continue;
for( Iterator sIt = m.getActiveBody().getUnits().iterator(); sIt.hasNext(); ) {
final Stmt s = (Stmt) sIt.next();