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authorSebastian Schmelzer2012-08-14 16:42:52 +0200
committerSebastian Schmelzer2012-08-14 16:42:52 +0200
commit9794dd2ef3d43632014caf1b3817316e7d3fc6cb (patch)
treef5c3618190c93fe221fdae6a711a3523cdbe59c1
parentAdded abstract entity classes (diff)
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minor jpa tweaks
-rw-r--r--src/main/java/nu/xss/jpa/dao/AbstractJpaDao.java40
-rw-r--r--src/main/java/nu/xss/jpa/dao/Dao.java2
-rw-r--r--src/main/java/nu/xss/jpa/dao/GenericJpaDao.java35
3 files changed, 33 insertions, 44 deletions
diff --git a/src/main/java/nu/xss/jpa/dao/AbstractJpaDao.java b/src/main/java/nu/xss/jpa/dao/AbstractJpaDao.java
deleted file mode 100644
index b1638ac..0000000
--- a/src/main/java/nu/xss/jpa/dao/AbstractJpaDao.java
+++ /dev/null
@@ -1,40 +0,0 @@
-package nu.xss.jpa.dao;
-
-import java.io.Serializable;
-import java.util.List;
-
-import javax.persistence.EntityManager;
-import javax.persistence.PersistenceContext;
-
-public abstract class AbstractJpaDao<E, K> implements Dao<E, K>, Serializable {
-
- private static final long serialVersionUID = 4998055731089977476L;
-
- @PersistenceContext
- protected EntityManager entityManager;
-
- protected Class<E> entity;
-
- public AbstractJpaDao(final Class<E> entity) {
- this.entity = (Class<E>) entity;
- }
-
- public void persist(E entity) {
- entityManager.persist(entity);
-
- }
-
- public void remove(E entity) {
- entityManager.remove(entity);
- }
-
- public E findById(K id) {
- return entityManager.find(entity, id);
- }
-
- public List<E> findAll() {
- // TODO Auto-generated method stub
- return null;
- }
-
-}
diff --git a/src/main/java/nu/xss/jpa/dao/Dao.java b/src/main/java/nu/xss/jpa/dao/Dao.java
index 2c541c9..345804c 100644
--- a/src/main/java/nu/xss/jpa/dao/Dao.java
+++ b/src/main/java/nu/xss/jpa/dao/Dao.java
@@ -8,4 +8,6 @@ public interface Dao<E, K> {
void delete(E entity);
E findById(K id);
List<E> findAll();
+ List<E> findAll(int count);
+ List<E> findAll(int count, int offset);
}
diff --git a/src/main/java/nu/xss/jpa/dao/GenericJpaDao.java b/src/main/java/nu/xss/jpa/dao/GenericJpaDao.java
index 21ee630..1eb1f59 100644
--- a/src/main/java/nu/xss/jpa/dao/GenericJpaDao.java
+++ b/src/main/java/nu/xss/jpa/dao/GenericJpaDao.java
@@ -2,12 +2,14 @@ package nu.xss.jpa.dao;
import java.io.Serializable;
import java.lang.reflect.ParameterizedType;
+import java.lang.reflect.Type;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.NoResultException;
import javax.persistence.NonUniqueResultException;
import javax.persistence.PersistenceContext;
+import javax.persistence.TypedQuery;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Root;
@@ -32,25 +34,29 @@ public abstract class GenericJpaDao<E extends TypedEntity<K>, K> implements
public GenericJpaDao() {
ParameterizedType genericSuperclass = (ParameterizedType) getClass()
.getGenericSuperclass();
- this.entity = (Class<E>) genericSuperclass.getActualTypeArguments()[0];
+ Type type = genericSuperclass.getActualTypeArguments()[0];
+ if (type instanceof Class) {
+ this.entity = (Class<E>) type;
+ } else if (type instanceof ParameterizedType) {
+ this.entity = (Class<E>) ((ParameterizedType)type).getRawType();
+ }
}
public void save(E entity) {
logger.info("Persist Entity: {}.", entity.toString());
entityManager.persist(entity);
- entityManager.flush();
logger.info("Saved entity: {}.", entity.toString());
}
public void merge(E entity) {
logger.info("Merge Entity: {}.", entity.toString());
entityManager.merge(entity);
- entityManager.flush();
logger.info("Saved entity: {}.", entity.toString());
}
public void delete(E entity) {
- entityManager.remove(entity);
+ E persistentEntity = findById(entity.getId());
+ entityManager.remove(persistentEntity);
logger.info("Deleted entity: {}.", entity.toString());
}
@@ -61,6 +67,14 @@ public abstract class GenericJpaDao<E extends TypedEntity<K>, K> implements
public List<E> findAll() {
return find(createSimpleQuery());
}
+
+ public List<E> findAll(int count) {
+ return find(createSimpleQuery(), count);
+ }
+
+ public List<E> findAll(int count, int offset) {
+ return find(createSimpleQuery(), count, offset);
+ }
protected CriteriaBuilder getCriteriaBuilder() {
return entityManager.getCriteriaBuilder();
@@ -82,6 +96,19 @@ public abstract class GenericJpaDao<E extends TypedEntity<K>, K> implements
return entityManager.createQuery(query).getResultList();
}
+ protected List<E> find(CriteriaQuery<E> query, int count) {
+ TypedQuery<E> q = entityManager.createQuery(query);
+ q.setMaxResults(count);
+ return q.getResultList();
+ }
+
+ protected List<E> find(CriteriaQuery<E> query, int count, int offset) {
+ TypedQuery<E> q = entityManager.createQuery(query);
+ q.setFirstResult(offset);
+ q.setMaxResults(count);
+ return q.getResultList();
+ }
+
protected E findSingle(CriteriaQuery<E> query) {
return entityManager.createQuery(query).getSingleResult();
}