/**
* 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.json;
import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
import org.apache.drill.common.exceptions.ExecutionSetupException;
import org.apache.drill.exec.ops.FragmentContext;
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 java.util.List;
public class JSONScanBatchCreator implements BatchCreator<JSONSubScan> {
@Override
public RecordBatch getBatch(FragmentContext context, JSONSubScan config, List<RecordBatch> children) throws ExecutionSetupException {
Preconditions.checkArgument(children.isEmpty());
List<JSONGroupScan.ScanEntry> entries = config.getReadEntries();
List<RecordReader> readers = Lists.newArrayList();
for (JSONGroupScan.ScanEntry e : entries) {
readers.add(new JSONRecordReader(context, e.getPath(), config.getStorageEngine().getFileSystem(), config.getRef()));
}
return new ScanBatch(context, readers.iterator());
}
}