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.metadata.datatype.Field;
  import org.apache.carbondata.sdk.file.CarbonSchemaReader;
  import org.apache.carbondata.sdk.file.Schema;
  
  import org.apache.hadoop.conf.Configuration;
  import org.apache.log4j.Logger;
  
  import static org.apache.hadoop.fs.s3a.Constants.*;
  
  /**
   * Example for testing carbonSchemaReader on S3
   */
  public class SDKS3SchemaReadExample {
    public static void main(String[] args) throws Exception {
      Logger logger = LogServiceFactory.getLogService(SDKS3SchemaReadExample.class.getName());
      int parameterLength = 3;
      if (args == null || args.length < parameterLength) {
        logger.error("Usage: java CarbonS3Example: <access-key> <secret-key>"
            + "<s3-endpoint> [table-path-on-s3]");
        System.exit(0);
      }
  
      String path = "s3a://obs-xubo4/sdkdata/test";
      if (args.length > parameterLength) {
        path = args[3];
      }
  
      Configuration configuration = new Configuration();
      configuration.set(ACCESS_KEY, args[0]);
      configuration.set(SECRET_KEY, args[1]);
      configuration.set(ENDPOINT, args[2]);
  
      // method 1 to read schema
      Schema schema = CarbonSchemaReader.readSchema(path, true, configuration);
      System.out.println("Schema length is " + schema.getFieldsLength());
      Field[] fields = schema.getFields();
      for (int i = 0; i < fields.length; i++) {
        System.out.println(fields[i] + "\t");
      }
  
      // method 2 to read schema
      Schema schema2 = CarbonSchemaReader.readSchema(path, configuration);
      System.out.println("Schema length is " + schema2.getFieldsLength());
      Field[] fields2 = schema2.getFields();
      for (int i = 0; i < fields2.length; i++) {
        System.out.println(fields2[i] + "\t");
      }
    }
  }
  