[JBoss Seam] - Re: @Filter example
by fernando_jmt
1.- Define the Filter in your Entity.
|
| @Entity
| @Table(name="NODE")
| @org.hibernate.annotations.FilterDef(
| name = "accessLevelFilter",
| parameters = {(a)org.hibernate.annotations.ParamDef(name = "currentAccessLevel", type="integer")}
| )
| @org.hibernate.annotations.Filter(
| name = "accessLevelFilter",
| condition = "READ_ACCESS_LEVEL <= :currentAccessLevel"
| )
| public abstract class Node implements Serializable {
| ...
| @Column(name = "READ_ACCESS_LEVEL", nullable = false)
| protected int readAccessLevel;
|
| ...
| }
|
|
2.- Configure components.xml
| <core:filter name="accessLevelFilter">
| <core:name>accessLevelFilter</core:name>
| <core:parameters>
| <key>currentAccessLevel</key>
| <value>#{currentAccessLevel}</value>
| </core:parameters>
| </core:filter>
|
| <core:managed-persistence-context name="restrictedEntityManager"
| auto-create="true"
| entity-manager-factory="#{wikiEntityManagerFactory}">
| <core:filters><value>#{accessLevelFilter}</value></core:filters>
| </core:managed-persistence-context>
|
|
|
3.- Set somewhere a value for #{currentAccessLevel}.
| Contexts.getSessionContext().set("currentAccessLevel", bestRole.getAccessLevel());
|
4.- Finally use the filtered Persistence Context.
| @Name("nodeDAO")
| @AutoCreate
| @Transactional
| public class NodeDAO {
|
| // Most of the DAO methods use this
| @In protected EntityManager restrictedEntityManager;
| ...
| public Node findNode(Long nodeId) {
| restrictedEntityManager.joinTransaction();
| try {
| return (Node) restrictedEntityManager
| .createQuery("select n from Node n where n.id = :nodeId")
| .setParameter("nodeId", nodeId)
| .getSingleResult();
| } catch (EntityNotFoundException ex) {
| } catch (NoResultException ex) {
| }
| return null;
| }
|
| }
|
|
Above steps are based on the Seam wiki example. If you want to see more, check it out.
HTH.
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19 years, 1 month