/* 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");
}
}
public static void addDecisiontTableRuleToRuleset(
RuleDictionary dict, BucketSet ageBucketSet, RuleSet ruleset) throws Exception {
RuleSheetTable sheetTable = ruleset.getRuleSheetTable();
RuleSheet dt = sheetTable.getByName("Proposal");
if (dt != null) {
System.out.println("Proposal already exists, skipping add");
} else {
// Add a new Rulesheet aka DecisionTable
dt = ruleset.getRuleSheetTable().add();
dt.setName("Proposal");
// Add two dimensions aka condition rows to table
Dimension[] conditions = new Dimension[2];
// First Row
conditions[0] = dt.getDimensionTable().add();
conditions[0].setValue("Person.age");
conditions[0].setSharedBucketSet(ageBucketSet);
// Second Row
conditions[1] = dt.getDimensionTable().add();
conditions[1].setValue("Person.policy_type");
conditions[1].setSharedBucketSetByAlias("Person$PolicyType");
System.out.println("RuleTable size is " + dt.getDTRuleTable().size());
DTAction dtAction = dt.getDTActionTable().add();
dtAction.setForm(Action.FORM_ASSERT_NEW);
dtAction.setTarget("Product");
dtAction.setAlwaysSelected(true);
Expression assertExp = dtAction.getExpressionByParameterAlias("name");
assertExp.setDTActionParameterName("name");
assertExp.setValue("\"PROD_TYPE1\"");
System.out.println("1. Rules can be added? " + dt.getDTRuleTable().canAdd());
DTRule dtRuleDef = dt.getDTRuleTable().get(0);
dtRuleDef.getDimensionNode(0).setValues("Minor");
dtRuleDef.getDimensionNode(1).setValues("INDIVIDUAL");
if (!RuleUtil.updateRuleDictionary(dict)) {
System.out.println("Dictionary update failed.");
} else {
System.out.println("Updated dictionary");
}
// 2 ---------------------------------------------
System.out.println("2. Rules can be added? " + dt.getDTRuleTable().canAdd());
DTRule dtRuleDef1 = dt.getDTRuleTable().add();
dtRuleDef1.getDimensionNode(0).setValues("Junior");
dtRuleDef1.getDimensionNode(1).setValues("GROUP");
if (!RuleUtil.updateRuleDictionary(dict)) {
System.out.println("Dictionary update failed.");
} else {
System.out.println("Updated dictionary");
}
Expression expr = dtRuleDef1.getDTActionNode(0).getExpressionByDTActionParameterName("name");
dtRuleDef1.getDTActionNode(0).setActionSelected(true);
if (expr != null) {
expr.setValue("\"PROD_TYPE2\"");
}
// 3 ---------------------------------------------
System.out.println("3. Rules can be added? " + dt.getDTRuleTable().canAdd());
DTRule dtRuleDef3 = dt.getDTRuleTable().add();
dtRuleDef3.getDimensionNode(0).setValues("Middle");
dtRuleDef3.getDimensionNode(1).setValues("INDIVIDUAL");
if (!RuleUtil.updateRuleDictionary(dict)) {
System.out.println("UNABLE to update dictionary.");
} else {
System.out.println("Updated dictionary");
}
Expression expr3 = dtRuleDef3.getDTActionNode(0).getExpressionByDTActionParameterName("name");
dtRuleDef3.getDTActionNode(0).setActionSelected(true);
if (expr3 != null) {
expr3.setValue("\"PROD_TYPE3\"");
}
// 4 ---------------------------------------------
System.out.println("4. Rules can be added? " + dt.getDTRuleTable().canAdd());
DTRule dtRuleDef4 = dt.getDTRuleTable().add();
dtRuleDef4.getDimensionNode(0).setValues("Senior");
dtRuleDef4.getDimensionNode(1).setValues("GROUP");
if (!RuleUtil.updateRuleDictionary(dict)) {
System.out.println("Dictionary update failed.");
} else {
System.out.println("Updated dictionary");
}
Expression expr4 = dtRuleDef4.getDTActionNode(0).getExpressionByDTActionParameterName("name");
dtRuleDef4.getDTActionNode(0).setActionSelected(true);
if (expr4 != null) {
expr4.setValue("\"PROD_TYPE4\"");
}
// 5 ---------------------------------------------
System.out.println("5. Rules can be added? " + dt.getDTRuleTable().canAdd());
DTRule dtRuleDef5 = dt.getDTRuleTable().add();
dtRuleDef5.getDimensionNode(0).setValues("Senior");
dtRuleDef5.getDimensionNode(1).setValues("UNKNOWN");
if (!RuleUtil.updateRuleDictionary(dict)) {
System.out.println("Dictionary update failed.");
} else {
System.out.println("Updated dictionary");
}
Expression expr5 = dtRuleDef5.getDTActionNode(0).getExpressionByDTActionParameterName("name");
dtRuleDef5.getDTActionNode(0).setActionSelected(true);
if (expr5 != null) {
expr5.setValue("\"PROD_TYPE0\"");
}
System.out.println("Rule table now contains " + dt.getDTRuleTable().size() + " rules");
}
}