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.jdbc.metamodel;
  
  import java.util.Optional;
  
  import org.springframework.data.relational.core.mapping.RelationalMappingContext;
  import org.springframework.data.relational.core.mapping.RelationalPersistentEntity;
  import org.springframework.data.relational.core.mapping.RelationalPersistentProperty;
  
  import org.apache.causeway.commons.collections.Can;
  import org.apache.causeway.commons.internal.exceptions._Exceptions;
  import org.apache.causeway.core.config.beans.CausewayBeanMetaData.PersistenceStack;
  import org.apache.causeway.core.metamodel.facets.object.entity.EntityOrmMetadata;
  import org.apache.causeway.core.metamodel.facets.object.entity.EntityOrmMetadata.ColumnOrmMetadata;
  
  import org.jspecify.annotations.NonNull;
  import lombok.experimental.UtilityClass;
  
  @UtilityClass
  class _MetadataUtil {
  
      EntityOrmMetadata ormMetadataFor(
              final @NonNull RelationalPersistentEntity<?> typeMetadata) {
          
          final @NonNull Optional<String> table = Optional.of(typeMetadata.getTableName().getReference());
          final @NonNull Optional<String> schema = Optional.empty();
          
          return new EntityOrmMetadata(
                  PersistenceStack.JDBC,
                  table, 
                  schema, 
                  typeMetadata.getRequiredIdProperty().getActualType(),
                  columns(typeMetadata),
                  typeMetadata);
      }
      
      /**
       * find the JDBC mapping metadata associated with this (corresponding) entity
       */
      RelationalPersistentEntity<?> jdbcEntityMetamodel(
              final RelationalMappingContext mappingContext,
              final Class<?> entityClass) {
          var exactMatch = mappingContext.getPersistentEntity(entityClass);
          if(exactMatch != null) return exactMatch;
          throw _Exceptions.noSuchElement("cannot find JDBC mapping metadata for entity %s", entityClass);
      }
  
      // -- HELPER
  
      private Can<ColumnOrmMetadata> columns(final RelationalPersistentEntity<?> typeMetadata) {
          return Can.ofIterable(typeMetadata) 
                  .map(_MetadataUtil::column);
      }
  
      private ColumnOrmMetadata column(final RelationalPersistentProperty property) {
          final @NonNull String name = property.getColumnName().getReference();
          final @NonNull String memberId = property.getName();
          final @NonNull String javaType = property.getActualType().getName();
          return new ColumnOrmMetadata(name, memberId, javaType, property);
      }
  
  }
  