package api.usage.twodotzero;

 import api.Writer;

 import java.io.IOException;

 import java.util.concurrent.atomic.AtomicInteger;

 /** Writer that counts the number of written in characters.

  */

 public class CountingWriter implements Writer.ImplSeq {

     private final AtomicInteger counter;

     private CountingWriter(AtomicInteger counter) {

         this.counter = counter;

     }

     public static Writer create(AtomicInteger result) {

         return Writer.create(new CountingWriter(result));

     }

     @Override

     public void write(CharSequence csq) throws IOException {

         counter.addAndGet(csq.length());

     }

     @Override

     public void flush() throws IOException {

     }

     @Override

     public void close() throws IOException {

     }

 }