From 85490a5f712c89a27fb8aaea10dd634af30b65bd Mon Sep 17 00:00:00 2001
From: Sebastian
Date: Fri, 24 Aug 2012 12:06:20 +0200
Subject: add checkstyle, javadoc

---
 src/main/java/nu/xss/jpa/dao/GenericJpaDao.java | 194 +++++++++++++++++++-----
 1 file changed, 153 insertions(+), 41 deletions(-)

(limited to 'src/main/java/nu/xss/jpa/dao/GenericJpaDao.java')

diff --git a/src/main/java/nu/xss/jpa/dao/GenericJpaDao.java b/src/main/java/nu/xss/jpa/dao/GenericJpaDao.java
index 0c06505..20be33f 100644
--- a/src/main/java/nu/xss/jpa/dao/GenericJpaDao.java
+++ b/src/main/java/nu/xss/jpa/dao/GenericJpaDao.java
@@ -1,3 +1,23 @@
+/**
+ * This file is part of xss-jpa.
+ *
+ * Copyright 2012 Sebastian Schmelzer
+ * http://xss.nu/
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
 package nu.xss.jpa.dao;
 
 import java.io.Serializable;
@@ -25,17 +45,33 @@ import nu.xss.jpa.query.filter.Filter;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+/**
+ * The Class GenericJpaDao.
+ * 
+ * @param <E>
+ *            the element type
+ * @param <K>
+ *            the key type
+ */
 public abstract class GenericJpaDao<E extends TypedEntity<K>, K> implements
 		Dao<E, K>, Serializable {
 
+	/** The Constant serialVersionUID. */
 	private static final long serialVersionUID = 4998055731089977476L;
-	protected final Logger logger = LoggerFactory.getLogger(this.getClass());
+	
+	/** The logger. */
+	private  Logger logger = LoggerFactory.getLogger(this.getClass());
 
+	/** The entity manager. */
 	@PersistenceContext
-	protected EntityManager entityManager;
+	private EntityManager entityManager;
 
-	protected Class<E> entity;
+	/** The entity. */
+	private Class<E> entityClass;
 
+	/**
+	 * Instantiates a new generic jpa dao.
+	 */
 	@SuppressWarnings("unchecked")
 	public GenericJpaDao() {
 		ParameterizedType genericSuperclass = (ParameterizedType) getClass()
@@ -44,23 +80,26 @@ public abstract class GenericJpaDao<E extends TypedEntity<K>, K> implements
 	    
 	    
 	    if (type instanceof Class) {
-	      this.entity = (Class<E>) type;
+	      this.entityClass = (Class<E>) type;
 	    } else if (type instanceof ParameterizedType) {
-	      this.entity = (Class<E>) ((ParameterizedType)type).getRawType();
+	      this.entityClass = (Class<E>) ((ParameterizedType) type).getRawType();
 	    }
 	}
 
-	public void save(E entity) {
+	@Override
+	public void save(final E entity) {
 		entityManager.persist(entity);
 		logger.info("Saved entity: {}.", entity.toString());
 	}
 
-	public void merge(E entity) {
+	@Override
+	public void merge(final E entity) {
 		entityManager.merge(entity);
 		logger.info("Updated unmanaged entity: {}.", entity.toString());
 	}
 
-	public void delete(E entity) {
+	@Override
+	public void delete(final E entity) {
 		final E persistentEntity = findById(entity.getId());
 		if (persistentEntity != null) {
 			entityManager.remove(persistentEntity);
@@ -68,8 +107,9 @@ public abstract class GenericJpaDao<E extends TypedEntity<K>, K> implements
 		logger.info("Deleted entity: {}.", entity.toString());
 	}
 
-	public E findById(K id) {
-		return entityManager.find(entity, id);
+	@Override
+	public final E findById(final K id) {
+		return entityManager.find(entityClass, id);
 	}
 
 	@Override
@@ -79,73 +119,114 @@ public abstract class GenericJpaDao<E extends TypedEntity<K>, K> implements
 	}
 
 	@Override
-	public int count(Filter... filter) {
+	public int count(final Filter... filter) {
 		// TODO Auto-generated method stub
 		return 0;
 	}
 
 	@Override
-	public List<E> findAll() {
+	public final List<E> findAll() {
 		return find(null, null, null);
 	}
 
 	@Override
-	public List<E> findAll(Sort sort) {
+	public final List<E> findAll(final Sort sort) {
 		return find(null, sort, null);
 	}
 
 	@Override
-	public List<E> findAll(Pagination pagination) {
+	public final List<E> findAll(final Pagination pagination) {
 		return find(null, null, pagination);
 	}
 
 	@Override
-	public List<E> findAll(Sort sort, Pagination pagination) {
+	public final List<E> findAll(final Sort sort, final Pagination pagination) {
 		return find(null, sort, pagination);
 	}
 
 	@Override
-	public List<E> findAll(Filter... filter) {
+	public final List<E> findAll(final Filter... filter) {
 		return find(null, null, null, filter);
 	}
 
 	@Override
-	public List<E> findAll(Sort sort, Filter... filter) {
+	public final List<E> findAll(final Sort sort, final Filter... filter) {
 		return find(null, sort, null, filter);
 	}
 
 	@Override
-	public List<E> findAll(Pagination pagination, Filter... filter) {
+	public final List<E> findAll(final Pagination pagination, final Filter... filter) {
 		return find(null, null, pagination, filter);
 	}
 
 	@Override
-	public List<E> findAll(Sort sort, Pagination pagination, Filter... filter) {
+	public final List<E> findAll(final Sort sort, final Pagination pagination, final Filter... filter) {
 		return find(null, sort, pagination, filter);
 	}
 
-	protected List<E> find(CriteriaQuery<E> query) {
+	/**
+	 * Find.
+	 * 
+	 * @param query
+	 *            the query
+	 * @return the list
+	 */
+	protected final List<E> find(final CriteriaQuery<E> query) {
 		return find(query, null, null);
 	}
 
-	protected List<E> find(CriteriaQuery<E> query, Pagination pagination) {
+	/**
+	 * Find.
+	 * 
+	 * @param query
+	 *            the query
+	 * @param pagination
+	 *            the pagination
+	 * @return the list
+	 */
+	protected final List<E> find(final CriteriaQuery<E> query, final Pagination pagination) {
 		return find(query, null, pagination);
 	}
 
-	protected List<E> find(CriteriaQuery<E> query, Sort sort) {
+	/**
+	 * Find.
+	 * 
+	 * @param query
+	 *            the query
+	 * @param sort
+	 *            the sort
+	 * @return the list
+	 */
+	protected final List<E> find(final CriteriaQuery<E> query, final Sort sort) {
 		return find(query, sort, null);
 	}
 
-	protected List<E> find(CriteriaQuery<E> query, Sort sort, Pagination pagination, Filter... filter) {
+	/**
+	 * Find.
+	 * 
+	 * @param query
+	 *            the query
+	 * @param sort
+	 *            the sort
+	 * @param pagination
+	 *            the pagination
+	 * @param filter
+	 *            the filter
+	 * @return the list
+	 */
+	protected List<E> find(final CriteriaQuery<E> query, final Sort sort, final Pagination pagination,
+			final Filter... filter) {
+		
 		Root<E> root;
+		CriteriaQuery<E> q = query;
 		
 		// check if we have a 'simple' query
-		if (query == null) {
-			query = createQuery();
+		if (q == null) {
+			q = createQuery();
 		}
 
-		root = query.from(this.entity);
-		query.select(root);
+		root = q.from(this.entityClass);
+		q.select(root);
 		
 		if (filter != null) {
 			Set<Predicate> predicates = new HashSet<Predicate>();
@@ -165,31 +246,45 @@ public abstract class GenericJpaDao<E extends TypedEntity<K>, K> implements
 		// TODO: Multcolum sort
 		if (sort != null) {
 			if (sort.isAsc()) {
-				query.orderBy(getCriteriaBuilder().asc(root.get(sort.getColumn())));
+				q.orderBy(getCriteriaBuilder().asc(root.get(sort.getColumn())));
 			} else {
-				query.orderBy(getCriteriaBuilder().desc(root.get(sort.getColumn())));
+				q.orderBy(getCriteriaBuilder().desc(root.get(sort.getColumn())));
 			}
 		}
 		
 		// Result pagination
-		TypedQuery<E> q = entityManager.createQuery(query);
+		TypedQuery<E> tq = entityManager.createQuery(q);
 		if (pagination != null) {
-			if ( pagination.getCount() > 0 ) {
-				q.setFirstResult(pagination.getCount());
+			if (pagination.getCount() > 0) {
+				tq.setFirstResult(pagination.getCount());
 			}
-			if ( pagination.getOffset() > 0) {
-				q.setMaxResults(pagination.getOffset());
+			if (pagination.getOffset() > 0) {
+				tq.setMaxResults(pagination.getOffset());
 			}
 		}
 		
-		return q.getResultList();
+		return tq.getResultList();
 	}
 	
-	protected E findSingle(CriteriaQuery<E> query) {
+	/**
+	 * Find single.
+	 * 
+	 * @param query
+	 *            the query
+	 * @return the e
+	 */
+	protected final E findSingle(final CriteriaQuery<E> query) {
 		return entityManager.createQuery(query).getSingleResult();
 	}
 
-	protected E findSingleOrNull(CriteriaQuery<E> query) {
+	/**
+	 * Find single or null.
+	 * 
+	 * @param query
+	 *            the query
+	 * @return the e
+	 */
+	protected final E findSingleOrNull(final CriteriaQuery<E> query) {
 		try {
 			return findSingle(query);
 		} catch (final NoResultException e) {
@@ -200,7 +295,14 @@ public abstract class GenericJpaDao<E extends TypedEntity<K>, K> implements
 		}
 	}
 
-	protected E findSingleFirstOrNull(CriteriaQuery<E> query) {
+	/**
+	 * Find single first or null.
+	 * 
+	 * @param query
+	 *            the query
+	 * @return the e
+	 */
+	protected final E findSingleFirstOrNull(final CriteriaQuery<E> query) {
 		try {
 			return findSingle(query);
 		} catch (final NoResultException e) {
@@ -212,12 +314,22 @@ public abstract class GenericJpaDao<E extends TypedEntity<K>, K> implements
 	}
 	
 
-	protected CriteriaBuilder getCriteriaBuilder() {
+	/**
+	 * Gets the criteria builder.
+	 * 
+	 * @return the criteria builder
+	 */
+	protected final CriteriaBuilder getCriteriaBuilder() {
 		return entityManager.getCriteriaBuilder();
 	}
 
-	protected CriteriaQuery<E> createQuery() {
-		CriteriaQuery<E> c = getCriteriaBuilder().createQuery(this.entity);
+	/**
+	 * Creates the query.
+	 * 
+	 * @return the criteria query
+	 */
+	protected final CriteriaQuery<E> createQuery() {
+		CriteriaQuery<E> c = getCriteriaBuilder().createQuery(this.entityClass);
 		return c;
 	}
 
-- 
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