content: /*
   * 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.carbondata.examples.sdk;
  
  import org.apache.carbondata.common.logging.LogServiceFactory;
  import org.apache.carbondata.core.constants.CarbonLoadOptionConstants;
  import org.apache.carbondata.core.metadata.datatype.DataTypes;
  import org.apache.carbondata.core.metadata.datatype.Field;
  import org.apache.carbondata.core.scan.expression.ColumnExpression;
  import org.apache.carbondata.core.scan.expression.LiteralExpression;
  import org.apache.carbondata.core.scan.expression.conditional.EqualToExpression;
  import org.apache.carbondata.core.util.CarbonProperties;
  import org.apache.carbondata.sdk.file.CarbonReader;
  import org.apache.carbondata.sdk.file.CarbonWriter;
  import org.apache.carbondata.sdk.file.Schema;
  
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.fs.s3a.Constants;
  import org.apache.log4j.Logger;
  
  import static org.apache.hadoop.fs.s3a.Constants.ACCESS_KEY;
  import static org.apache.hadoop.fs.s3a.Constants.ENDPOINT;
  import static org.apache.hadoop.fs.s3a.Constants.SECRET_KEY;
  
  /**
   * Example for testing CarbonWriter on S3
   */
  public class SDKS3Example {
    public static void main(String[] args) throws Exception {
      Logger logger = LogServiceFactory.getLogService(SDKS3Example.class.getName());
      if (args == null || args.length < 3) {
        logger.error("Usage: java CarbonS3Example: <access-key> <secret-key>"
            + "<s3-endpoint> [table-path-on-s3] [rows] [Number of writes]");
        System.exit(0);
      }
  
      String backupProperty = CarbonProperties.getInstance().getProperty(
          CarbonLoadOptionConstants.ENABLE_CARBON_LOAD_DIRECT_WRITE_TO_STORE_PATH,
          CarbonLoadOptionConstants.ENABLE_CARBON_LOAD_DIRECT_WRITE_TO_STORE_PATH_DEFAULT);
      CarbonProperties.getInstance().addProperty(
          CarbonLoadOptionConstants.ENABLE_CARBON_LOAD_DIRECT_WRITE_TO_STORE_PATH, "true");
  
      String path = "s3a://sdk/WriterOutput";
      if (args.length > 3) {
        path = args[3];
      }
  
      int rows = 3;
      if (args.length > 4) {
        rows = Integer.parseInt(args[4]);
      }
      int num = 3;
      if (args.length > 5) {
        num = Integer.parseInt(args[5]);
      }
  
      Configuration conf = new Configuration(true);
      conf.set(Constants.ACCESS_KEY, args[0]);
      conf.set(Constants.SECRET_KEY, args[1]);
      conf.set(Constants.ENDPOINT, args[2]);
  
      Field[] fields = new Field[2];
      fields[0] = new Field("name", DataTypes.STRING);
      fields[1] = new Field("age", DataTypes.INT);
      for (int j = 0; j < num; j++) {
        CarbonWriter writer = CarbonWriter.builder().outputPath(path).withHadoopConf(conf)
            .withCsvInput(new Schema(fields)).writtenBy("SDKS3Example").build();
  
        for (int i = 0; i < rows; i++) {
          writer.write(new String[] { "robot" + (i % 10), String.valueOf(i) });
        }
        writer.close();
      }
      // Read data
  
      EqualToExpression equalToExpression = new EqualToExpression(
          new ColumnExpression("name", DataTypes.STRING),
          new LiteralExpression("robot1", DataTypes.STRING));
  
      CarbonReader reader = CarbonReader.builder(path, "_temp").projection(
          new String[] { "name", "age" }).filter(equalToExpression).withHadoopConf(conf).build();
  
      System.out.println("\nData:");
      int i = 0;
      while (i < 20 && reader.hasNext()) {
        Object[] row = (Object[]) reader.readNextRow();
        System.out.println(row[0] + " " + row[1]);
        i++;
      }
      System.out.println("\nFinished");
      reader.close();
  
      // Read without filter
      CarbonReader reader2 = CarbonReader.builder(path, "_temp").projection(
          new String[] { "name", "age" }).withHadoopConf(ACCESS_KEY, args[0]).withHadoopConf(
          SECRET_KEY, args[1]).withHadoopConf(ENDPOINT, args[2]).build();
  
      System.out.println("\nData:");
      i = 0;
      while (i < 20 && reader2.hasNext()) {
        Object[] row = (Object[]) reader2.readNextRow();
        System.out.println(row[0] + " " + row[1]);
        i++;
      }
      System.out.println("\nFinished");
      reader2.close();
  
      CarbonProperties.getInstance().addProperty(
          CarbonLoadOptionConstants.ENABLE_CARBON_LOAD_DIRECT_WRITE_TO_STORE_PATH, backupProperty);
    }
  }
  