Association Rules - dmardemo.java - DisplayAssociationRules method

Question

Hi, friends!
I'm making some changes in the sample Java demo for the Association Rules - dmardemo.java. I've created another method which contains the name of the model just created before and in this same method, I call the method to display the association rules detected:
public static void restoreRules(String modelNome) throws JDMException {
m_modelName = modelNome;
model = (AssociationModel)m_dmeConn.retrieveObject(
m_modelName, NamedObject.model);
displayAssociationRules(model);
In another class, which is a GUI, I'm trying to call that method to restore all the rules found in the mining process and display them in a jTable Swing component. For this, I've tried to adapt the main method (displayAssocationRules) to do this, as follows:
public static Object displayAssociationRules(AssociationModel model)
throws JDMException {
// DISPLAY TOP-10 ASSOCIATION RULES
Object[] obj = new Object[5];
int contador = 0;
// 1. Set order by confidence DESC, support DESC
OraRulesFilter filter = (OraRulesFilter) m_filterFactory.create();
filter.setOrderingCondition(
new RuleProperty[] { RuleProperty.confidence, RuleProperty.support},
new SortOrder[] { SortOrder.descending, SortOrder.descending }
// 2. Set to return the first 10 rules only
filter.setMaxNumberOfRules(10);
// 3. Retrieve rules
Collection rules = model.getRules(filter);
Iterator iRules = rules.iterator();
while( iRules.hasNext() )
OraAssociationRule rule = (OraAssociationRule) iRules.next();
obj[0] = rule.getRuleIdentifier();
//System.out.print( "Rule " + rule.getRuleIdentifier() + ": " );
Itemset antecedent = rule.getAntecedent();
//obj[1] = antecedent.getItems();
Object[] ante_items = antecedent.getItems();
// sort the items in antecedent to produce deterministic order of items
TreeSet sortedSet = new TreeSet();
for(int i = 0; i < obj.length; i++)
sortedSet.add(ante_items);
obj[1] = ante_items;
Iterator sortedI = sortedSet.iterator();
/*while(sortedI.hasNext())
System.out.print(sortedI.next() + " ");*/
Itemset consequent = rule.getConsequent();
Object[] cons_items = consequent.getItems();
obj[2] = cons_items;
obj[3] = m_df.format(rule.getSupport());
obj[4] = m_df.format(rule.getConfidence());
/*System.out.println("==> " + cons_items[0] + " (support=" +
m_df.format(rule.getSupport()) + ", confidence=" + m_df.format(rule.getConfidence()) + ")" );*/
return obj;
Some parts of the old code are present in that for you to compare what I've done. However, it's not working. What should I do to see the rules generated in the process in a jTable?
Regards
Luis

Answer 1

As you can see in the code above, I've split the code into two parts. However, a problem is happening when I try to restore the rules to the GUI.
"Exception in thread "AWT-EventQueue-0" javax.datamining.JDMIllegalArgumentException: The required argument objectName is null. Supply a non-null value."
It says that I'm not passing any parameters to the method. But, as you can see, in the first method I've created, I took the name of the model and transfers it for the method displayAssociationRules as a AssociationModel objet.
In the GUI, in an event for the button "Restore Rules", I've put this code below:
String modelo = Principal.getModelName(); // where Principal is the main GUI class for the execution of the process.
dmardemo.restoreRules(modelo);// I call the method in the dmardemo class to restore the rules having a String (modelo) as its parameter. That's when the problem happens. Is the argument really null, as the error message says?
Regards
Luis