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.schema;
  
  import org.apache.calcite.linq4j.QueryProvider;
  import org.apache.calcite.linq4j.Queryable;
  import org.apache.calcite.linq4j.tree.Expression;
  
  import java.lang.reflect.Type;
  
  /**
   * Extension to {@link Table} that can translate itself to a {@link Queryable}.
   */
  public interface QueryableTable extends Table {
    /** Converts this table into a {@link Queryable}. */
    <T> Queryable<T> asQueryable(QueryProvider queryProvider, SchemaPlus schema,
        String tableName);
  
    /** Returns the element type of the collection that will implement this
     * table. */
    Type getElementType();
  
    /** Generates an expression with which this table can be referenced in
     * generated code.
     *
     * @param schema Schema
     * @param tableName Table name (unique within schema)
     * @param clazz The desired collection class; for example {@code Queryable}.
     */
    Expression getExpression(SchemaPlus schema, String tableName, Class clazz);
  }
  