/* This method demonstrates how to add a new BucketSet to a dictionary data model
*
* @param dict An existing rules dictionary object
*/
public static BucketSet addBucketSet(RuleDictionary dictionary) throws Exception {
DataModel model = dictionary.getDataModel();
// Create a new bucketset holding product weight descriptions
BucketSetTable bucketSetTable = model.getBucketSetTable();
BucketSet productWeightBucketSet = bucketSetTable.getByName("ShipWeightType");
if (productWeightBucketSet != null) {
System.out.println("ShipWeightType BucketSet already exists, skipping add");
} else {
productWeightBucketSet = bucketSetTable.add();
productWeightBucketSet.setName("ShipWeightType");
productWeightBucketSet.setForm(BucketSet.FORM_LOV);
productWeightBucketSet.add("Light");
productWeightBucketSet.add("Heavy");
productWeightBucketSet.add("VeryHeavy");
}
return productWeightBucketSet;
}
public static BucketSet addAgeBucketSet(RuleDictionary dictionary) throws Exception {
DataModel model = dictionary.getDataModel();
// Create a new bucketset holding product weight descriptions
BucketSetTable bucketSetTable = model.getBucketSetTable();
BucketSet ageBucketSet = bucketSetTable.getByName("Age");
if (ageBucketSet != null) {
System.out.println("Age BucketSet already exists, skipping add");
} else {
ageBucketSet = bucketSetTable.add();
ageBucketSet.setName("Age");
ageBucketSet.setForm(BucketSet.FORM_RANGE);
ageBucketSet.setType("int");
ageBucketSet.add("<0").setAlias("Minor");
ageBucketSet.add("<18").setAlias("Junior");
ageBucketSet.add("<50").setAlias("Middle");
ageBucketSet.add("<75").setAlias("Senior");
}
return ageBucketSet;
}
/* This method demonstrates how to add a Decision Table to a Rule Set
*
* @param dict An existing rules dictionary object
* @param shipBucketSet An existing bucketset
* @param ruleset An existing ruleset contained in the dictionary
*/
public static void addDecisiontTableRuleToRuleset(
RuleDictionary dict, BucketSet shipBucketSet, RuleSet ruleset) throws Exception {
RuleSheetTable sheetTable = ruleset.getRuleSheetTable();
RuleSheet dt = sheetTable.getByName("DecisionTable1");
if (dt != null) {
System.out.println("shipSurchargeRule already exists, skipping add");
} else {
// Add a new Rulesheet aka DecisionTable
dt = ruleset.getRuleSheetTable().add();
dt.setName("DecisionTable1");
//
// Add two dimensions aka condition rows to table
//
Dimension[] conditions = new Dimension[2];
// First Row
conditions[0] = dt.getDimensionTable().add();
conditions[0].setValue("ItemT.productWeight");
// Each condition must have an associated bucket set
// In this case an existing named bucketset
conditions[0].setSharedBucketSet(shipBucketSet);
// Second Row
conditions[1] = dt.getDimensionTable().add();
conditions[1].setValue("ItemT.unitPrice.longValue()");
// Auto create a Local bucket set for the second condition
BucketSet bs = conditions[1].getBucketSet();
bs.setForm(BucketSet.FORM_RANGE);
Bucket buck = bs.add("<50");
System.out.println("RuleTable size is " + dt.getDTRuleTable().size());
// Add an Action for the decision table
// A DTAction is an action that may be selected by any rule in the decision table,
// optionally with different parameters per rule.
// An ExpressionTable entry is created when an Action Form property is set so that it has the
// correct
// number and type of parameters. ExpressionTable Rows cannot be directly added, deleted, or
// moved.
DTAction dtAction = dt.getDTActionTable().add();
dtAction.setForm(Action.FORM_MODIFY);
dtAction.setTarget("ItemT");
// Set the target expression as a decision table action parameter
Expression surchargeExpr = dtAction.getExpressionByParameterAlias("shipSurcharge");
// If each rule wants to set a different action value then the DTAction value shoudl be
// parameterized,
// then each rule DTActionNode receives a dynamic copy of the expression (parameter table)
surchargeExpr.setDTActionParameterName("shipSurcharge");
// set a value for all rules, or a default value if parameterized
surchargeExpr.setValue("10.0");
// An initial default rule is added to the Decision Table when a dimension is added to the
// decision table
// The default rule has no dimensions set.
// If we remove the initial rule, it also removes all dimensions from the DimensionTable
// The default rule must have its dimensions set before canAdd() will be true and more rules
// can be added to the rule table
// The canAdd() method on the RuleTable indicates whether a new rule can be added
// New rules can only be added to the rule table if all the existing rules in the table have
// dimensions specified.
// Also if two rules are added with identical condition values, the second add is ignored
System.out.println("Rules can be added? " + dt.getDTRuleTable().canAdd());
DTRule dtRuleDef = dt.getDTRuleTable().get(0);
dtRuleDef.getDimensionNode(0).setValues("otherwise");
dtRuleDef.getDimensionNode(1).setValues(">=50");
if (!updateRuleDictionary(dict)) System.out.println("UNABLE to update dictionary.");
else System.out.println("Updated dictionary");
// Next add more rules to the table, 1 for each value in the ship bucket set productWeight
BucketSet bucketSet = conditions[0].getBucketSet();
List<Bucket> bcks = bucketSet.getBuckets();
for (int i = 1;
i < bcks.size() - 1;
i++) // skip the first bucket value handled by the default rule
{
System.out.println("Rules can be added " + dt.getDTRuleTable().canAdd());
DTRule dtRule =
dt.getDTRuleTable().add(); // use returned rule, cannot use rule returned by .get(i) ?
System.out.println("Added new rule");
// Set the dimension/condition values for the new rule
dtRule.getDimensionNode(0).setValues(bcks.get(i).getName()); // "Heavy, Very Light etc"
dtRule.getDimensionNode(1).setValues(">=50");
// An update is required here so a DTActionNode Expression table entry for the new rule will
// be created.
// If an expression parameter in the DTAction exists, then the expression is copied from the
// DTActionNode of the new Rule.
// A value for the parameter will be added later after the update
if (!updateRuleDictionary(dict)) System.out.println("UNABLE to update dictionary.");
else System.out.println("Updated dictionary");
}
// Loop again and set the parmameter values for each rule expression
for (int i = 1;
i < bcks.size() - 1;
i++) // skip the first bucket value handled by the default rule
{
DTRule dtRuleDef1 = dt.getDTRuleTable().get(i);
Expression expr =
dtRuleDef1.getDTActionNode(0).getExpressionByDTActionParameterName("shipSurcharge");
// Estimate a cost
if (expr != null) expr.setValue(Double.toString(i * 15.00));
}
System.out.println("Rule table now contains " + dt.getDTRuleTable().size() + " rules");
if (!updateRuleDictionary(dict)) System.out.println("UNABLE to update dictionary.");
else System.out.println("Updated dictionary");
}
}