GenericFacade.java
3.96 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
package fi.insomnia.bortal.facade;
import java.util.ArrayList;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.NoResultException;
import javax.persistence.TypedQuery;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Path;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import fi.insomnia.bortal.model.ModelInterface;
/**
* Session Bean implementation class GenericFacade
*/
public abstract class GenericFacade<PK, T extends ModelInterface> {
private static final Logger logger = LoggerFactory.getLogger(GenericFacade.class);
private final Class<T> entClass;
public GenericFacade(Class<T> entityClass) {
this.entClass = entityClass;
}
protected Class<T> getEntityClass() {
return entClass;
}
protected abstract EntityManager getEm();
public void create(T entity) {
getEm().persist(entity);
}
public void remove(T entity) {
getEm().remove(entity);
}
public T merge(T entity) {
return getEm().merge(entity);
}
public T find(PK id) {
if (id == null) {
return null;
}
T ret = getEm().find(getEntityClass(), id);
return ret;
}
public List<T> findAll() {
return findAll(null);
}
public List<T> findAll(String sort) {
return search(0, 0, null, null, sort);
}
public List<T> findRange(int[] range) {
CriteriaQuery<T> cq = getEm().getCriteriaBuilder().createQuery(getEntityClass());
cq.select(cq.from(getEntityClass()));
TypedQuery<T> q = getEm().createQuery(cq);
q.setMaxResults(range[1] - range[0]);
q.setFirstResult(range[0]);
return q.getResultList();
}
public long count() {
CriteriaQuery<Long> cq = getEm().getCriteriaBuilder().createQuery(Long.class);
Root<T> rt = cq.from(getEntityClass());
cq.select(getEm().getCriteriaBuilder().count(rt));
TypedQuery<Long> q = getEm().createQuery(cq);
return q.getSingleResult();
}
protected static <K> K getSingleNullableResult(TypedQuery<K> q) {
K ret = null;
try {
ret = q.getSingleResult();
} catch (NoResultException e) {
ret = null;
}
return ret;
}
public void evict(T entity) {
if (entity != null && entity.getId() != null) {
getEm().getEntityManagerFactory().getCache().evict(getEntityClass(), entity.getId());
}
}
protected List<T> search(String query, String[] fields, String orderfield) {
return search(0, 0, query, fields, orderfield);
}
protected List<T> search(int page, int pagesize, String query, String[] fields, String orderfield) {
CriteriaBuilder cb = getEm().getCriteriaBuilder();
CriteriaQuery<T> cq = cb.createQuery(getEntityClass());
Root<T> root = cq.from(getEntityClass());
if (query != null && !query.isEmpty()) {
addPredicates(cb, cq, root, query, fields);
}
if (orderfield != null) {
cq.orderBy(cb.asc(root.get(orderfield)));
}
cq.select(root);
TypedQuery<T> q = getEm().createQuery(cq);
if (pagesize > 0) {
logger.debug("Setting pagesize {} at facade", pagesize);
q.setFirstResult(page * pagesize);
q.setMaxResults(pagesize);
}
List<T> ret = q.getResultList();
return ret;
}
protected long searchCount(String query, String[] fields) {
CriteriaBuilder cb = getEm().getCriteriaBuilder();
CriteriaQuery<Long> cq = cb.createQuery(Long.class);
Root<T> root = cq.from(getEntityClass());
if (query != null && !query.isEmpty()) {
addPredicates(cb, cq, root, query, fields);
}
cq.select(getEm().getCriteriaBuilder().count(root));
TypedQuery<Long> q = getEm().createQuery(cq);
return q.getSingleResult();
}
private void addPredicates(CriteriaBuilder cb, CriteriaQuery<?> cq, Root<T> root, String query, String[] fields) {
List<Predicate> preds = new ArrayList<Predicate>();
for (String field : fields) {
Path<String> rootfield = root.get(field);
preds.add(cb.like(cb.lower(rootfield), query));
}
cq.where(cb.or(preds.toArray(new Predicate[preds.size()])));
}
}