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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.jpa.BatooTemplates;
import com.querydsl.jpa.DataNucleusTemplates;
import com.querydsl.jpa.EclipseLinkTemplates;
import com.querydsl.jpa.HQLTemplates;
import com.querydsl.jpa.Hibernate5Templates;
import com.querydsl.jpa.JPQLTemplates;
import com.querydsl.jpa.OpenJPATemplates;
import jakarta.persistence.EntityManager;
import java.util.HashMap;
import java.util.Map;

/**
 * {@code JPAProvider} provides detection of the JPA provider based on the EntityManager instance
 *
 * @author tiwe
 */
public final class JPAProvider {

  private static final Map, JPQLTemplates> mappings = new HashMap<>();

  private static final Map templatesByName = new HashMap<>();

  private static void addMapping(String className, JPQLTemplates templates) {
    try {
      mappings.put(Class.forName(className), templates);
    } catch (Exception e) {
    }
  }

  static {
    boolean hibernate5;

    try {
      var version = Class.forName("org.hibernate.Session").getPackage().getImplementationVersion();
      var versionParts = version.split("\\.");
      var major = Integer.parseInt(versionParts[0]);
      hibernate5 = major >= 5;
    } catch (Exception e) {
      hibernate5 = true;
    }

    var hibernateTemplates = hibernate5 ? Hibernate5Templates.DEFAULT : HQLTemplates.DEFAULT;

    addMapping("org.batoo.jpa.core.impl.manager.EntityManagerImpl", BatooTemplates.DEFAULT);
    addMapping("org.hibernate.Session", hibernateTemplates);
    addMapping("org.hibernate.ejb.HibernateEntityManager", hibernateTemplates);
    addMapping("org.hibernate.jpa.HibernateEntityManager", hibernateTemplates);
    addMapping("org.eclipse.persistence.jpa.JpaEntityManager", EclipseLinkTemplates.DEFAULT);
    addMapping("org.apache.openjpa.persistence.OpenJPAEntityManager", OpenJPATemplates.DEFAULT);
    addMapping("org.datanucleus.jpa.EntityManagerImpl", DataNucleusTemplates.DEFAULT);
    addMapping("org.datanucleus.ObjectManager", DataNucleusTemplates.DEFAULT);
    addMapping("org.datanucleus.ObjectManagerImpl", DataNucleusTemplates.DEFAULT);

    templatesByName.put("batoo", BatooTemplates.DEFAULT);
    templatesByName.put("eclipselink", EclipseLinkTemplates.DEFAULT);
    templatesByName.put("hibernate4", HQLTemplates.DEFAULT);
    templatesByName.put("hibernate", Hibernate5Templates.DEFAULT);
    templatesByName.put("openjpa", OpenJPATemplates.DEFAULT);
    templatesByName.put("datanucleus", DataNucleusTemplates.DEFAULT);
  }

  public static JPQLTemplates getTemplates(EntityManager em) {
    for (Map.Entry, JPQLTemplates> entry : mappings.entrySet()) {
      Class entityManagerClass = entry.getKey();
      try {
        if (entityManagerClass.isInstance(em.unwrap(entityManagerClass))) {
          return entry.getValue();
        }
      } catch (
          Exception
              e) { // The PersistenceException is wrapped in an InvocationException for EclipseLink
        // detect by delegate
        if (entityManagerClass.isAssignableFrom(em.getDelegate().getClass())) {
          return entry.getValue();
        }
      }
    }
    // detect by properties
    for (String key : em.getEntityManagerFactory().getProperties().keySet()) {
      key = key.toLowerCase();
      for (Map.Entry entry : templatesByName.entrySet()) {
        if (key.contains(entry.getKey())) {
          return entry.getValue();
        }
      }
    }
    return JPQLTemplates.DEFAULT;
  }

  private JPAProvider() {}
}