Mercurial > lada > lada-server
comparison src/main/java/de/intevation/lada/data/Repository.java @ 43:13178bbe77ff
New generic repository for data requests.
| author | Raimund Renkert <rrenkert@intevation.de> |
|---|---|
| date | Fri, 24 May 2013 11:51:01 +0200 |
| parents | |
| children | 74a488e52dde |
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| 42:28b9167e5a5b | 43:13178bbe77ff |
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| 1 package de.intevation.lada.data; | |
| 2 | |
| 3 import java.util.List; | |
| 4 | |
| 5 import javax.enterprise.context.ApplicationScoped; | |
| 6 import javax.inject.Inject; | |
| 7 import javax.persistence.EntityManager; | |
| 8 import javax.persistence.criteria.CriteriaBuilder; | |
| 9 import javax.persistence.criteria.CriteriaQuery; | |
| 10 import javax.persistence.criteria.Root; | |
| 11 import javax.inject.Named; | |
| 12 | |
| 13 /** | |
| 14 * This generic Container is an interface to request and select Data | |
| 15 * obejcts from the connected database. | |
| 16 * | |
| 17 * @author <a href="mailto:rrenkert@intevation.de">Raimund Renkert</a> | |
| 18 */ | |
| 19 @Named | |
| 20 @ApplicationScoped | |
| 21 public class Repository | |
| 22 { | |
| 23 /** | |
| 24 * The entitymanager managing the data. | |
| 25 */ | |
| 26 @Inject | |
| 27 private EntityManager em; | |
| 28 | |
| 29 /** | |
| 30 * Get all objects of type <link>clazz</link>from database. | |
| 31 * | |
| 32 * @param clazz The class type. | |
| 33 * @return List of objects. | |
| 34 */ | |
| 35 public <T> List<T> findAll(Class<T> clazz) { | |
| 36 CriteriaBuilder builder = em.getCriteriaBuilder(); | |
| 37 CriteriaQuery<T> criteria = builder.createQuery(clazz); | |
| 38 Root<T> member = criteria.from(clazz); | |
| 39 criteria.select(member); | |
| 40 return em.createQuery(criteria).getResultList(); | |
| 41 } | |
| 42 | |
| 43 /** | |
| 44 * Find a single object identified by its id. | |
| 45 * | |
| 46 * @param clazz The class type. | |
| 47 * @param id The object id. | |
| 48 * @return The requested object of type clazz | |
| 49 */ | |
| 50 public <T> T findById(Class<T> clazz, String id) { | |
| 51 return em.find(clazz, id); | |
| 52 } | |
| 53 } |