filter parsefrom not used

import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.exceptions.DeserializationException;
import org.apache.hadoop.hbase.filter.Filter;
import org.apache.hadoop.hbase.filter.FilterBase;
import org.apache.hadoop.hbase.util.Bytes;

import java.io.IOException;

public class CustomFlightFilter extends FilterBase {
    private float delay;
    private boolean remain_cancelled;
    private boolean remove_it;

    public CustomFlightFilter() {
        super();
        this.remain_cancelled = true;   //if no parameters then remain cancelled flights
    }

    public CustomFlightFilter(float delay) {
        this.delay = delay;
        this.remain_cancelled = false;  //if delay has been set then remove cancelled
    }

    @Override
    public ReturnCode filterKeyValue(Cell cell) throws IOException {
        String qualifier = new String(
                cell.getQualifierArray(),
                cell.getQualifierOffset(),
                cell.getQualifierLength());

        String value = new String(
                cell.getValueArray(),
                cell.getValueOffset(),
                cell.getValueLength());

        if (remain_cancelled) {
            if (qualifier.equals("cancelled")) {
                if (!value.equals("") && (float) 1 == Float.parseFloat(value)) {

                    //dont remove this row with cancelled flight from final set
                    remove_it = false;
                }
            }

        }

        if (!remain_cancelled) {
            if (qualifier.equals("arr_delay_new")) {
                if (!value.equals("") &&
                        Float.parseFloat(value) > delay) {

                    //remove this row with delay > set_delay from final set
                    remove_it = true;
                }
            }

        }
        return ReturnCode.INCLUDE;
        //insert this cell into processed row like <cell> + <cell> + <cell> ...
    }

    public static Filter parseFrom(byte[] pbBytes) throws DeserializationException{
        return new CustomFlightFilter(Bytes.toFloat(pbBytes));
    }

    @Override
    public byte[] toByteArray() throws IOException {
        return Bytes.toBytes(delay);
    }

    @Override
    public boolean filterRow() throws IOException {
        return remove_it;
    }

    @Override
    public void reset() throws IOException {
        remove_it = true;
    }
}