com.google.cloud.hadoop.io.bigquery.GsonBigQueryInputFormat Maven / Gradle / Ivy

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/**
 * Copyright 2017 Google LLC
 *
 *  Licensed 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
 *
 *     https://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 com.google.cloud.hadoop.io.bigquery;

import com.google.gson.JsonObject;
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.RecordReader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * GsonBigQueryInputFormat provides access to BigQuery tables via exports to GCS in the form of
 * gson JsonObjects as mapper values.
 */
public class GsonBigQueryInputFormat
    extends AbstractBigQueryInputFormat {
  protected static final Logger LOG = LoggerFactory.getLogger(GsonBigQueryInputFormat.class);

  @Override
  public RecordReader createDelegateRecordReader(
      InputSplit split, Configuration configuration) throws IOException, InterruptedException {
    LOG.debug("createDelegateRecordReader -> new GsonRecordReader");
    return new GsonRecordReader();
  }

  @Override
  public ExportFileFormat getExportFileFormat() {
    return ExportFileFormat.LINE_DELIMITED_JSON;
  }
}