import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.io.*;

String encodedValue;
public boolean processRow(StepMetaInterface smi, StepDataInterface sdi) throws KettleException
{
// First, get a row from the default input hop
//
Object[] r = getRow();

// If the row object is null, we are done processing.
//
if (r == null) {
    setOutputDone();
    return false;
}

// It is always safest to call createOutputRow() to ensure that your output row's Object[] is large
// enough to handle any new fields you are creating in this step.
//
Object[] outputRow = createOutputRow(r, data.outputRowMeta.size());

String newFileName = get(Fields.In,"to_be_encoded_path").getString(r);

try{
    encodedValue = URLEncoder.encode(newFileName, "UTF-8");
}
catch (UnsupportedEncodingException e) {
throw new AssertionError("UTF-8 is unknown");
}
// Set the value in the output field
//
get(Fields.Out, "encodedFileName").setValue(outputRow, encodedValue);

// putRow will send the row on to the default output hop.
//
putRow(data.outputRowMeta, outputRow);

return true;
}