EntityQuery.java
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package fi.insomnia.intra.dao;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import javax.persistence.EntityManager;
import javax.persistence.Query;
public class EntityQuery<T> {
private String namedQuery;
private String countQuery;
private EntityManager em;
private int pagesize = 0;
private int page = 0;
private long resultsize = 0;
private Map<String, Object> parameters = new HashMap<String, Object>();
private EntityQuery(String namedQuery, String countQuery, EntityManager em) {
this.namedQuery = namedQuery;
this.countQuery = countQuery;
this.em = em;
}
@SuppressWarnings("unchecked")
public List<T> getItems(IPagingStatus paging) {
Query query = em.createNamedQuery(namedQuery);
Query count = null;
if (getPagesize() > 0) {
query.setFirstResult(getPage() * getPagesize());
query.setMaxResults(getPagesize());
count = em.createNamedQuery(countQuery);
}
for (Entry<String, Object> obj : parameters.entrySet()) {
query.setParameter(obj.getKey(), obj.getValue());
if (count != null) {
count.setParameter(obj.getKey(), obj.getValue());
}
}
List ret = query.getResultList();
resultsize = ret.size();
if (count != null) {
Object resultO = count.getSingleResult();
if (resultO instanceof Long) {
resultsize = ((Long) resultO);
} else if (resultO instanceof Integer) {
resultsize = ((Integer) resultO).longValue();
}
}
return ret;
}
public void addParameter(String name, Object value)
{
parameters.put(name, value);
}
public long getResultsize() {
return resultsize;
}
public void setPage(int page) {
this.page = page;
}
public int getPage() {
return page;
}
public void setPagesize(int pagesize) {
this.pagesize = pagesize;
}
public int getPagesize() {
return pagesize;
}
}