Thank you all for comments.
I go deeper for the path, I added DataSaveListener for it, you can use
DataSaveListener to process DataSaveEvent . Also added another
Contructor for SaveData with addtional parameters isLocked and
isAutoRemovable.
"isLocked" means pages have to have consume at least one rule in
pageRuleList, example, we have one rules {page1,page2,page3}. if you
set isLocked=true; you have to go through from page1 to page3 all
steps. So this will avoid data cleaned when user open another page
unexpected. Also give a clear path for processing back tracking(I will
think about next step).
"isAutoRemovable" means, PhaseListener can't remove it, code has to
remove it, so you can keep data in session as long as you like.
------------- listener interface -----
public interface DataSaveListener extends EventListener, Serializable {
public String getDataId();
public void beforeSave(DataSaveEvent e);
public void afterSave(DataSaveEvent e);
public void beforeRemove(DataSaveEvent e);
public void afterRemove(DataSaveEvent e);
}
public class DataSaveEvent extends EventObject {
private SaveData saveData;
public DataSaveEvent(SaveData saveData){
super(saveData);
if (saveData == null) throw new NullPointerException("saveData");
this.saveData = saveData;
}
/**
* @return Returns the saveData.
*/
public SaveData getSaveData() {
return saveData;
}
}
---------- isRemovable method added in SaveData class-----
public boolean isRemovable(){
if( !isAutoRemovable ) return false;
boolean removable = true;
if( isLocked ){
if( pageRuleList!=null && pageRuleList.size()>0 ){
removable = false;//we check if one of rules all
consumed
for( int pi = 0;pi<pageRuleList.size();pi++
){//consume all rules
LinkedList rulePath =
(LinkedList)pageRuleList.get(pi);
if( rulePath.size()==0 ){
removable =
true;
break;
}
}
}
}
return removable;
}
--
Zhong Li
WebJabber.Net
