[jboss-user] [JBoss Seam] - Ma generic do even more version of EntityQuery : MyEntityQue
i want to share with you this generic do-even-more version of EntityQuery
with the below class it's even easier to write EntityQuery objects.
the EJBQL is generated automatically (example FROM Account account).
there is a getExample() method that returns an example instance (for search paramaters as
in the seam-gen generated code)
each time setOrder is hit, if the field was the same as the current, the order switches
(for asc/desc switching).
the current order can be queried with getReverse
example using MyEntityQuery
| @Name("managedRoles")
| @Scope(ScopeType.CONVERSATION)
| public class ManagedRolesQuery extends MyEntityQuery<Role> {
|
| private static final String[] RESTRICTIONS = {
| "role.creationPath LIKE
concat(#{currentSubscription.targetPath},'%')",
| "role.name LIKE concat(#{managedRoles.example.name},'%')" };
|
|
| @Override
| public List<String> getRestrictions() {
| return Arrays.asList(RESTRICTIONS);
| }
|
| }
|
feedback welcom !
| package up.seam;
|
| import java.lang.reflect.ParameterizedType;
| import java.lang.reflect.Type;
|
| import org.jboss.seam.framework.EntityQuery;
|
| import up.util.LangUtil;
|
| public class MyEntityQuery<T> extends EntityQuery {
|
| // you cannot initialize (results in bug for seam 2.0.0.GA)
| protected T example = null;
|
| public T getExample() {
| if (example == null) {
| example = createInstance();
| }
| return example;
| }
|
| public void setExample(final T example) {
| this.example = example;
| }
|
| protected Boolean reverse = false;
|
| public Boolean getReverse() {
| return reverse;
| }
|
| public void setReverse(Boolean reverse) {
| this.reverse = reverse;
| }
|
| @Override
| public Integer getMaxResults() {
| return 25;
| }
|
| @Override
| public void setOrder(final String order) {
|
| System.out.println("REQUEST TO SORT: " + order + ", was " +
super.getOrder());
| if (LangUtil.isNotEmpty(order)) {
| if (order.equals(this.getOrder())) {
| this.reverse = !this.reverse;
| } else {
| this.reverse = false;
| }
| super.setOrder(order);
| }
| }
|
| @Override
| public String getOrder() {
| if (reverse)
| return super.getOrder() + " desc";
| else
| return super.getOrder();
| }
|
| private static final long serialVersionUID = 1L;
|
|
| @Override
| public String getEjbql() {
|
| final String entityClassName = getEntityClass().getSimpleName();
| // System.out.println(entityClassName);
|
| final String ejbql = "from "+entityClassName+"
"+entityClassName.toLowerCase();
| // System.out.println(ejbql);
| return ejbql;
| }
|
| public T createInstance() {
|
| if (getEntityClass() != null) {
| try {
| return getEntityClass().newInstance();
| } catch (Exception e) {
| throw new RuntimeException(e);
| }
| } else {
| return null;
| }
| }
|
| protected Class<T> entityClass;
|
| public Class<T> getEntityClass() {
| if (entityClass == null) {
| Type type = getClass().getGenericSuperclass();
| System.out.println("found class " + getClass());
| System.out.println("found type " + type);
| if (type instanceof ParameterizedType) {
| ParameterizedType paramType = (ParameterizedType) type;
| entityClass = (Class<T>) paramType.getActualTypeArguments()[0];
| } else {
| throw new IllegalArgumentException("Could not guess entity class by
reflection");
| }
| }
| return entityClass;
| }
|
| }
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