JdbcQueryProvider.java

/*
 * 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.jdbc;

import org.apache.calcite.linq4j.Enumerator;
import org.apache.calcite.linq4j.QueryProvider;
import org.apache.calcite.linq4j.QueryProviderImpl;
import org.apache.calcite.linq4j.Queryable;

import static org.apache.calcite.linq4j.Nullness.castNonNull;

/**
 * Implementation of {@link QueryProvider} that talks to JDBC databases.
 */
public final class JdbcQueryProvider extends QueryProviderImpl {
  public static final JdbcQueryProvider INSTANCE = new JdbcQueryProvider();

  private JdbcQueryProvider() {
  }

  @Override public <T> Enumerator<T> executeQuery(Queryable<T> queryable) {
    return castNonNull(null);
  }
}