QueryableTable.java example

Explorer
optiq-master
/*
 * 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 net.hydromatic.optiq;

import net.hydromatic.linq4j.QueryProvider;
import net.hydromatic.linq4j.Queryable;
import net.hydromatic.linq4j.expressions.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);
}

// End QueryableTable.java