public SafraAlgorithm(NBA nba, Options_Safra options)
{
_options = options;
_nba_analysis = new NBAAnalysis(nba);
_nba = nba;
_NODES = 2 * nba.getStateCount();////////////ensure the number of nodes is enough
stv_reorder = null;
//{
// _next.resize(nba.getStateCount());
//}
}
/**
* Get the next Safra tree using the
* transition function as described by Safra.
* @param tree the original tree
* @param elem the edge label
* @return a SafraTreeTemplate containing the new tree and
* bookkeeping which states were created/deleted.
*/
SafraTreeTemplate process(SafraTree tree, APElement elem)
{
// Make copy of original tree
SafraTree cur = new SafraTree(tree);
SafraTreeTemplate tree_template = new SafraTreeTemplate(cur);
STVisitor_reset_final_flag stv_reset_flag = new STVisitor_reset_final_flag();
cur.walkTreePostOrder(stv_reset_flag);
////#if NBA2DRA_POWERSET_FIRST
// STVisitor_powerset stv_powerset = new STVisitor_powerset(_nba, elem);
// cur.walkTreePostOrder(stv_powerset);
// STVisitor_check_finalset stv_final = new STVisitor_check_finalset(_nba_analysis.getFinalStates(), tree_template);
// cur.walkTreePostOrder(stv_final);
//#else
/////////generate new child
STVisitor_check_finalset stv_final = new STVisitor_check_finalset(_nba_analysis.getFinalStates(), tree_template);
cur.walkTreePostOrder(stv_final);
//////////change the old label to new label using powerset
STVisitor_powerset stv_powerset = new STVisitor_powerset(_nba, elem);
cur.walkTreePostOrder(stv_powerset);
//#endif
/*
* Optimization: ACCEPTING_TRUE_LOOPS
*/
if (_options.opt_accloop)///////////how to decide the value?
{
if (cur.getRootNode() != null)
{
SafraTreeNode root = cur.getRootNode();
if (_nba_analysis.getStatesWithAcceptingTrueLoops().intersects(root.getLabeling()))
{
// True Loop
STVisitor_remove_subtree stv_remove = new STVisitor_remove_subtree(tree_template);
cur.walkChildrenPostOrder(stv_remove, root);
root.getLabeling().clear();
int canonical_true_loop = _nba_analysis.getStatesWithAcceptingTrueLoops().nextSetBit(0);
root.getLabeling().set(canonical_true_loop);
root.setFinalFlag(true);
return(tree_template);
}
}
}
//check if the younger child has the same labels of older ones. If so, remove the same labels from younger child
STVisitor_check_children_horizontal stv_horizontal = new STVisitor_check_children_horizontal();/////////note sth wrong
cur.walkTreePostOrder(stv_horizontal);
//check if a node becomes empty. If so, remove it.
STVisitor_check_children_horizontal.STVisitor_check_children_vertical.STVisitor_remove_empty stv_empty = new STVisitor_check_children_horizontal.STVisitor_check_children_vertical.STVisitor_remove_empty(tree_template);
cur.walkTreePostOrder(stv_empty);
//check if a node's children's labels union is same with itself's. If so, remove the children and mark this node.
STVisitor_check_children_horizontal.STVisitor_check_children_vertical stv_vertical = new STVisitor_check_children_horizontal.STVisitor_check_children_vertical(tree_template);
cur.walkTreePostOrder(stv_vertical);
/*
* Optimization: REORDER
*/
if (_options.opt_reorder)////////
{
if (stv_reorder == null)
{
stv_reorder = new STVisitor_check_children_horizontal.STVisitor_check_children_vertical.STVisitor_reorder_children(_nba_analysis.getReachability(), cur.getNodeMax());
}
cur.walkTreePostOrder(stv_reorder);
}
/*
* Optimization: ALL SUCCESSORS ARE ACCEPTING
*/
if (_options.opt_accsucc)////////
{
STVisitor_check_children_horizontal.STVisitor_check_children_vertical.STVisitor_check_for_succ_final stv_succ = new STVisitor_check_children_horizontal.STVisitor_check_children_vertical.STVisitor_check_for_succ_final(_nba_analysis.getStatesWithAllSuccAccepting(), tree_template);
cur.walkTreePostOrder(stv_succ);
if (stv_succ.wasSuccessful())
{
#if NBA2DRA_MERGE
if (stv_succ.wasMerged())
{
SafrasAlgorithmInternal::STVisitor_remove_empty stv_empty;
cur.walkTreePostOrder(stv_empty);
SafrasAlgorithmInternal::STVisitor_check_children_vertical stv_vertical;
cur.walkTreePostOrder(stv_vertical);
}
#endif // NBA2DRA_MERGE
}
}
return(tree_template);
}
