contrib/storage-jdbc/src/main/java/org/apache/drill/exec/store/jdbc/JdbcBatchCreator.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.drill.exec.store.jdbc;

import java.util.Collections;
import java.util.List;

import org.apache.drill.common.exceptions.ExecutionSetupException;
import org.apache.drill.exec.ops.ExecutorFragmentContext;
import org.apache.drill.exec.physical.impl.BatchCreator;
import org.apache.drill.exec.physical.impl.ScanBatch;
import org.apache.drill.exec.record.RecordBatch;
import org.apache.drill.exec.store.RecordReader;

import org.apache.drill.shaded.guava.com.google.common.base.Preconditions;

public class JdbcBatchCreator implements BatchCreator<JdbcSubScan> {
  @Override
  public ScanBatch getBatch(ExecutorFragmentContext context, JdbcSubScan config,
      List<RecordBatch> children) throws ExecutionSetupException {
    Preconditions.checkArgument(children.isEmpty());
    JdbcStoragePlugin plugin = config.getPlugin();
    RecordReader reader = new JdbcRecordReader(plugin.getDataSource(),
        config.getSql(), plugin.getName(), config.getColumns());
    return new ScanBatch(config, context, Collections.singletonList(reader));
  }
}