97 lines
3.0 KiB
Java
97 lines
3.0 KiB
Java
package eu.eudat.queryable.hibernatequeryablelist;
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import eu.eudat.queryable.QueryableList;
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import eu.eudat.queryable.predicates.OrderByPredicate;
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import eu.eudat.queryable.predicates.SelectPredicate;
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import eu.eudat.queryable.predicates.SinglePredicate;
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import javax.persistence.EntityManager;
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import javax.persistence.TypedQuery;
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import javax.persistence.criteria.CriteriaBuilder;
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import javax.persistence.criteria.CriteriaQuery;
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import javax.persistence.criteria.Predicate;
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import javax.persistence.criteria.Root;
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import java.util.LinkedList;
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import java.util.List;
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public class QueryableHibernateList<T> implements QueryableList<T> {
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private EntityManager manager;
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private CriteriaQuery<T> query;
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private Class<T> tClass;
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private Root<T> root;
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private LinkedList<Predicate> predicates = new LinkedList<Predicate>();
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private Integer length;
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private Integer offset;
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public QueryableHibernateList(EntityManager manager, Class<T> tClass) {
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this.manager = manager;
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this.tClass = tClass;
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}
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public QueryableHibernateList<T> setManager(EntityManager manager) {
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this.manager = manager;
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return this;
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}
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public QueryableHibernateList<T> setEntity(Class<T> type) {
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CriteriaBuilder builder = this.manager.getCriteriaBuilder();
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this.query = builder.createQuery(type);
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this.root = this.query.from(this.tClass);
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return this;
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}
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public void initiateQueryableList(Class<T> type) {
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CriteriaBuilder builder = this.manager.getCriteriaBuilder();
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this.query = builder.createQuery(type);
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}
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@Override
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public QueryableList<T> skip(Integer offset) {
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this.offset = offset;
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return this;
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}
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@Override
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public QueryableList<T> take(Integer length) {
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this.length = length;
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return this;
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}
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public QueryableList<T> where(SinglePredicate<T> predicate) {
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this.predicates.add(predicate.applyPredicate(this.manager.getCriteriaBuilder(), this.root));
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return this;
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}
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public <R> List<R> select(SelectPredicate<T, R> predicate) {
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List<T> list = this.toList();
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List<R> newlist = new LinkedList<R>();
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for (T item : list) {
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newlist.add(predicate.applySelection(item));
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}
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return newlist;
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}
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public QueryableList<T> distinct() {
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this.query.distinct(true);
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return this;
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}
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public QueryableList<T> orderBy(OrderByPredicate<T> predicate) {
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this.query.orderBy(predicate.applyPredicate(this.manager.getCriteriaBuilder(), this.root));
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return this;
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}
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public List<T> toList() {
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Predicate[] array = new Predicate[this.predicates.size()];
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this.predicates.toArray(array);
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this.query.where(array);
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TypedQuery<T> typedQuery = this.manager.createQuery(this.query);
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if(this.offset!=null)typedQuery.setFirstResult(this.offset);
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if(this.length!=null)typedQuery.setMaxResults(this.length);
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return typedQuery.getResultList();
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}
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}
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