Personnalisation du générateur de séquence de promotion

Voici un exemple de générateur de séquence. Il s'apparente au générateur de séquence par défaut, mais ne donne pas la priorité aux promotions pour lesquelles un code promotionnel ou un bon de réduction a été entré.

package com.ibm.commerce.marketing.promotion.runtime;

import java.util.Enumeration;
import java.util.Vector;

import org.w3c.dom.Node;

import com.ibm.commerce.copyright.IBMCopyright;
import com.ibm.commerce.marketing.promotion.Promotion;
import com.ibm.commerce.marketing.promotion.group.PromotionGroup;
import com.ibm.commerce.marketing.promotion.group.PromotionGroupKey;
import com.ibm.commerce.marketing.promotion.xml.DeXMLizationException;
import com.ibm.commerce.marketing.promotion.xml.XMLizationException;
import com.ibm.commerce.marketing.util.XMLHelper;

/**
 *A sequence builder for the promotion engine. The following rules are observed
 * 1. Promotions specified in a group that is defined earlier in the promotion
 *    invocation template are called before a promotion that is in a group defined
 *    later in the template.
 * 2. For promotions in the same group, when all else is equal, the one with a higher
 *    priority is invoked earlier than one that has a lower priority.
 *
 */
 
public class StaticSequenceBuilder implements PromotionExecutionSequenceBuilder {

   /**
    * IBM Copyright
    */
   public static final String COPYRIGHT= IBMCopyright.SHORT_COPYRIGHT;
        
        
   /**
    * Constructor.
    *
    */ 
   public StaticSequenceBuilder() {
      super();
   }

   /**
    * Compares the priority of two promotions
    * @param promo1
    * @param promo2
    * @param context the current promotion context
    * @return >;0 when promo1 has precedence over promo2, =0,
    * promo1 and promo2 have the same priority, <0, promo2
    * takes precedence over promo1
    */
   protected int comparePromotionPriority(
      Promotion promo1,
      Promotion promo2,
      PromotionContext context) {
           
         PromotionGroupKey key1 = promo1.getGroupKey();
         PromotionGroupKey key2 = promo2.getGroupKey();
           
         PromotionGroup groups[] = context.getGroups();
         for (int i= 0; i < groups.length; i++) {
            if (groups[i].getKey().equals(key1)
            && (!groups[i].getKey().equals(key2))) {
               return 1;
            }
            if (groups[i].getKey().equals(key2)
               && (!groups[i].getKey().equals(key1))) {
                  return -1;
               }
            }
           
            return promo1.getPriority().compareTo(promo2.getPriority());
         }
        
         /**
          * @see com.ibm.commerce.marketing.promotion.runtime.
          * PromotionExecutionSequenceBuilder#buildSequence(
          * com.ibm.commerce.marketing.promotion.runtime.PromotionContext)
          */
         public Vector buildSequence(PromotionContext context) {
            // calculate the sequence in which promotions will be evaluated
            Vector sequence = new Vector();
            Enumeration promos = context.listAllPromotions();
            while (promos.hasMoreElements()) {
               Promotion promo = (Promotion) promos.nextElement();
               boolean inserted = false;
               for (int i = 0; i < sequence.size(); i++) {
                  if (comparePromotionPriority(promo,
                     (Promotion) sequence.elementAt(i),
                     context) > 0) {
                        sequence.insertElementAt(promo, i);
                        inserted = true;
                        break;
                  }
               }
               if (!inserted) {
                  sequence.addElement(promo);
               }
            }
            return sequence;
         }
         
         /**
          * @see com.ibm.commerce.marketing.promotion.xml.XMLizable#toXML()
          */
         public String toXML() throws XMLizationException {
            StringBuffer buffer = new StringBuffer();
            buffer
               .append("<PromotionExecutionSequenceBuilder impl=\"")
               .append(this.getClass().getName())
               .append("\"/>");
               
            return buffer.toString();
         }
         
         
         /**
          * @see com.ibm.commerce.marketing.promotion.xml
          * .XMLizable#fromXML(org.w3c.dom.Node)
          */
         public void fromXML(Node anXMLNode) throws DeXMLizationException {
            try {
               if this.getClass()
                  != Class.forName(
                  XMLHelper.getAttributeValue(anXMLNode,"impl"))) {
                     throw new DeXMLizationException("Wrong implementation");
                  }
               } catch (DeXMLizationException e) {
                  throw e;
               } catch (Throwable e) {
                  throw new DeXMLizationException(e.toString());
               }
            }
            
         }
      }