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.

 *

 * @author Jaroslav Tulach

 */

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 {

    }

}