content: /*
   *  Licensed to the Apache Software Foundation (ASF) under one
   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you 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 org.apache.causeway.persistence.jpa.eclipselink.metamodel;
  
  import java.lang.reflect.Method;
  
  import jakarta.persistence.metamodel.EntityType;
  import jakarta.persistence.metamodel.SingularAttribute;
  
  import org.eclipse.persistence.descriptors.ClassDescriptor;
  import org.eclipse.persistence.mappings.DatabaseMapping;
  
  import org.apache.causeway.commons.internal.base._Lazy;
  import org.apache.causeway.commons.internal.context._Context;
  
  import lombok.SneakyThrows;
  import lombok.experimental.UtilityClass;
  
  @UtilityClass
  class _EclipseLinkInternals {
      
      @SneakyThrows
      ClassDescriptor getClassDescriptor(final EntityType<?> entityType) {
          return (ClassDescriptor) managedTypeImplGetDescriptor.get().invoke(entityType, new Object[0]);
      }
      
      @SneakyThrows
      DatabaseMapping getDatabaseMapping(final SingularAttribute<?, ?> sa) {
          return (DatabaseMapping) attributeImplGetMappingLazy.get().invoke(sa, new Object[0]);
      }
      
      // -- HELPER
      
      private _Lazy<Method> managedTypeImplGetDescriptor = _Lazy.threadSafe(()->{
          var x = _Context.loadClass("org.eclipse.persistence.internal.jpa.metamodel.ManagedTypeImpl");
          return x.getMethod("getDescriptor", new Class[0]);
      });
      
      private _Lazy<Method> attributeImplGetMappingLazy = _Lazy.threadSafe(()->{
          var x = _Context.loadClass("org.eclipse.persistence.internal.jpa.metamodel.AttributeImpl");
          return x.getMethod("getMapping", new Class[0]);
      }); 
      
  }
  