package filters;

// cc QualifierFilterExample Example using a filter to include only specific column qualifiers
import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.filter.BinaryComparator;
import org.apache.hadoop.hbase.filter.CompareFilter;
import org.apache.hadoop.hbase.filter.Filter;
import org.apache.hadoop.hbase.filter.QualifierFilter;
import org.apache.hadoop.hbase.util.Bytes;

import util.HBaseHelper;

public class QualifierFilterExample {

  public static void main(String[] args) throws IOException {
    Configuration conf = HBaseConfiguration.create();

    HBaseHelper helper = HBaseHelper.getHelper(conf);
    helper.dropTable("testtable");
    helper.createTable("testtable", "colfam1", "colfam2");
    System.out.println("Adding rows to table...");
    helper.fillTable("testtable", 1, 10, 10, "colfam1", "colfam2");

    Connection connection = ConnectionFactory.createConnection(conf);
    Table table = connection.getTable(TableName.valueOf("testtable"));

    // vv QualifierFilterExample
    Filter filter = new QualifierFilter(CompareFilter.CompareOp.LESS_OR_EQUAL,
      new BinaryComparator(Bytes.toBytes("col-2")));

    Scan scan = new Scan();
    scan.setFilter(filter);
    ResultScanner scanner = table.getScanner(scan);
    // ^^ QualifierFilterExample
    System.out.println("Scanning table... ");
    // vv QualifierFilterExample
    for (Result result : scanner) {
      System.out.println(result);
    }
    scanner.close();

    Get get = new Get(Bytes.toBytes("row-5"));
    get.setFilter(filter);
    Result result = table.get(get);
    System.out.println("Result of get(): " + result);
    // ^^ QualifierFilterExample
  }
}