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Compact tool for building SQL, JPA or hibernate queries. Supports utilities for spring pagination and sorting. Supports extending to other types of query languages. Has no transitive dependencies - use only what you need.

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package org.bitbucket.brunneng.qb;

import javax.persistence.EntityManager;
import javax.persistence.Query;
import javax.persistence.TypedQuery;

/**
 * JPQL Query builder which uses jpa {@link EntityManager} to build queries.
 */
public class JpaQueryBuilder extends AbstractJpqlQueryBuilder {

   private final EntityManager entityManager;

   public JpaQueryBuilder(EntityManager entityManager) {
      this.entityManager = entityManager;
   }

   @Override
   protected Query createQuery(QueryWithParams queryWithParams) {
      Query query = entityManager.createQuery(queryWithParams.getQuery());
      applyParametersToQuery(query, queryWithParams.getParameters());
      return query;
   }

   @Override
   protected  TypedQuery createTypedQuery(QueryWithParams queryWithParams, Class targetClass) {
      TypedQuery query = entityManager.createQuery(queryWithParams.getQuery(), targetClass);
      applyParametersToQuery(query, queryWithParams.getParameters());
      return query;
   }

   @Override
   protected Query createNativeQuery(QueryWithParams queryWithParams) {
      Query query = entityManager.createNativeQuery(queryWithParams.getQuery());
      applyParametersToQuery(query, queryWithParams.getParameters());
      return query;
   }

}