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.calcite.adapter.java;
  
  import org.apache.calcite.rel.type.RelDataType;
  import org.apache.calcite.rel.type.RelDataTypeFactory;
  
  import java.lang.reflect.Type;
  import java.util.List;
  
  /**
   * Type factory that can register Java classes as record types.
   */
  public interface JavaTypeFactory extends RelDataTypeFactory {
    /**
     * Creates a record type based upon the public fields of a Java class.
     *
     * @param clazz Java class
     * @return Record type that remembers its Java class
     */
    RelDataType createStructType(Class clazz);
  
    /**
     * Creates a type, deducing whether a record, scalar or primitive type
     * is needed.
     *
     * @param type Java type, such as a {@link Class}
     * @return Record or scalar type
     */
    RelDataType createType(Type type);
  
    Type getJavaClass(RelDataType type);
  
    /** Creates a synthetic Java class whose fields have the given Java
     * types. */
    Type createSyntheticType(List<Type> types);
  
    /** Converts a type in Java format to a SQL-oriented type. */
    RelDataType toSql(RelDataType type);
  }
  