Implement exercise 7.11.1

pom.xml

@@ -26,6 +26,11 @@
 			<artifactId>primefaces</artifactId>
 			<version>8.0</version>
 		</dependency>
+		<dependency>
+			<groupId>org.hibernate</groupId>
+			<artifactId>hibernate-core</artifactId>
+			<version>5.4.18.Final</version>
+		</dependency>
 	</dependencies>
 
 	<build>

src/main/java/de/dpunkt/myaktion/model/Campaign.java

@@ -32,7 +32,8 @@ import javax.validation.constraints.Size;
         @NamedQuery(name = Campaign.findAll, 
                 query = "SELECT c FROM Campaign c ORDER BY c.name"),
         @NamedQuery(name = Campaign.getAmountDonatedSoFar,
-                query = "SELECT SUM(d.amount) FROM Donation d WHERE d.campaign = :campaign") })
+                query = "SELECT SUM(d.amount) FROM Donation d WHERE d.campaign = :campaign") 
+})
 @Entity
 public class Campaign {
     //----------------------------------------------------------------------------------------------

src/main/java/de/dpunkt/myaktion/model/DateEntity.java

+/*
+ * Copyright 2019 (C) by Julian Horner.
+ * All Rights Reserved.
+ */
+
+package de.dpunkt.myaktion.model;
+
+/**
+ * @author Julian
+ *
+ */
+public class DateEntity {
+
+}

src/main/java/de/dpunkt/myaktion/services/CampaignServiceBean.java

@@ -11,6 +11,7 @@ import java.util.logging.Level;
 import java.util.logging.Logger;
 
 import javax.ejb.Stateless;
+import javax.enterprise.inject.Alternative;
 import javax.inject.Inject;
 import javax.persistence.EntityManager;
 import javax.persistence.TypedQuery;
@@ -22,6 +23,7 @@ import de.dpunkt.myaktion.util.Log.TecLog;
  * @author Julian
  */
 @Stateless
+@Alternative
 public class CampaignServiceBean implements CampaignService {
     //----------------------------------------------------------------------------------------------
 

src/main/java/de/dpunkt/myaktion/services/CriteriaCampaignServiceBean.java

+/*
+ * Copyright 2019 (C) by Julian Horner.
+ * All Rights Reserved.
+ */
+
+package de.dpunkt.myaktion.services;
+
+import java.math.BigDecimal;
+import java.util.List;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import javax.ejb.Stateless;
+import javax.enterprise.inject.Alternative;
+import javax.inject.Inject;
+import javax.persistence.EntityManager;
+import javax.persistence.TypedQuery;
+import javax.persistence.criteria.CriteriaBuilder;
+import javax.persistence.criteria.CriteriaQuery;
+import javax.persistence.criteria.ParameterExpression;
+import javax.persistence.criteria.Root;
+
+import de.dpunkt.myaktion.model.Campaign;
+import de.dpunkt.myaktion.model.Donation;
+import de.dpunkt.myaktion.util.Log.TecLog;
+
+/**
+ * @author Julian
+ */
+@Stateless
+@Alternative
+public class CriteriaCampaignServiceBean implements CampaignService {
+    //----------------------------------------------------------------------------------------------
+
+    @Inject
+    @TecLog
+    private Logger logger;
+
+    @Inject
+    EntityManager entityManager;
+
+    //----------------------------------------------------------------------------------------------
+
+    @Override
+    public List<Campaign> getAllCampaigns() {
+        CriteriaBuilder cb = entityManager.getCriteriaBuilder();
+        
+        CriteriaQuery<Campaign> criteriaQuery = cb.createQuery(Campaign.class);
+        
+        Root<Campaign> campaignRoot = criteriaQuery.from(Campaign.class);
+        criteriaQuery.select(campaignRoot).orderBy(cb.asc(campaignRoot.get("name")));
+        
+        TypedQuery<Campaign> query = entityManager.createQuery(criteriaQuery);
+        List<Campaign> campaigns = query.getResultList();
+
+//        campaigns.forEach(campaign -> 
+//                campaign.setAmountDonatedSoFar(new BigDecimal(getAmountDonatedSoFar(campaign))));
+        
+        for (Campaign campaign : campaigns) {
+            campaign.setAmountDonatedSoFar(new BigDecimal(getAmountDonatedSoFar(campaign)));
+        }
+        
+        logger.log(Level.INFO, "Loaded all campaign entities with criteria query");
+
+        return campaigns;
+    }
+
+    //----------------------------------------------------------------------------------------------
+
+    @Override
+    public void addCampaign(Campaign campaign) {
+        entityManager.persist(campaign);
+    }
+
+    //----------------------------------------------------------------------------------------------
+
+    @Override
+    public void updateCampaign(Campaign campaign) {
+        entityManager.merge(campaign);
+    }
+
+    //----------------------------------------------------------------------------------------------
+
+    @Override
+    public void deleteCampaign(Campaign campaign) {
+        Campaign managedCampaign = entityManager.find(Campaign.class, campaign.getId());
+        entityManager.remove(managedCampaign);
+    }
+
+    //----------------------------------------------------------------------------------------------
+
+    private Double getAmountDonatedSoFar(Campaign campaign) {        
+        CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder();
+        CriteriaQuery<Double> criteriaQuery = criteriaBuilder.createQuery(Double.class);
+        Root<Donation> donation = criteriaQuery.from(Donation.class);
+        
+        ParameterExpression<Campaign> campaignParameter = criteriaBuilder.parameter(Campaign.class);
+        
+        criteriaQuery.select(criteriaBuilder.sumAsDouble(donation.get("amount")))
+                .where(criteriaBuilder.equal(donation.get("campaign"), campaignParameter));        
+        
+        TypedQuery<Double> query = entityManager.createQuery(criteriaQuery);
+        query.setParameter(campaignParameter, campaign);
+        
+        Double result = query.getSingleResult();        
+        if (result == null) 
+            result = 0d;
+
+        return result;
+    }
+
+    //----------------------------------------------------------------------------------------------
+}
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