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JPA support for Querydsl
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/*
 * Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.querydsl.jpa.impl;

import com.querydsl.core.DefaultQueryMetadata;
import com.querydsl.core.QueryMetadata;
import com.querydsl.core.Tuple;
import com.querydsl.core.types.Expression;
import com.querydsl.jpa.JPQLQuery;
import com.querydsl.jpa.JPQLTemplates;
import jakarta.persistence.EntityManager;

/**
 * {@code JPAQuery} is the default implementation of the {@link JPQLQuery} interface for JPA
 *
 * @param  result type
 * @author tiwe
 */
public class JPAQuery extends AbstractJPAQuery> {

  /** Creates a new detached query The query can be attached via the clone method */
  public JPAQuery() {
    super(null, JPQLTemplates.DEFAULT, new DefaultQueryMetadata());
  }

  /**
   * Creates a new EntityManager bound query
   *
   * @param em entity manager
   */
  public JPAQuery(EntityManager em) {
    super(em, JPAProvider.getTemplates(em), new DefaultQueryMetadata());
  }

  /**
   * Creates a new EntityManager bound query
   *
   * @param em entity manager
   * @param metadata query metadata
   */
  public JPAQuery(EntityManager em, QueryMetadata metadata) {
    super(em, JPAProvider.getTemplates(em), metadata);
  }

  /**
   * Creates a new query
   *
   * @param em entity manager
   * @param templates templates
   */
  public JPAQuery(EntityManager em, JPQLTemplates templates) {
    super(em, templates, new DefaultQueryMetadata());
  }

  /**
   * Creates a new query
   *
   * @param em entity manager
   * @param templates templates
   * @param metadata query metadata
   */
  public JPAQuery(EntityManager em, JPQLTemplates templates, QueryMetadata metadata) {
    super(em, templates, metadata);
  }

  @Override
  public JPAQuery clone(EntityManager entityManager, JPQLTemplates templates) {
    var q = new JPAQuery(entityManager, templates, getMetadata().clone());
    q.clone(this);
    return q;
  }

  @Override
  public JPAQuery clone(EntityManager entityManager) {
    return clone(entityManager, JPAProvider.getTemplates(entityManager));
  }

  @Override
  public  JPAQuery select(Expression expr) {
    queryMixin.setProjection(expr);
    @SuppressWarnings("unchecked") // This is the new type
    var newType = (JPAQuery) this;
    return newType;
  }

  @Override
  public JPAQuery select(Expression... exprs) {
    queryMixin.setProjection(exprs);
    @SuppressWarnings("unchecked") // This is the new type
    var newType = (JPAQuery) this;
    return newType;
  }
}