jtulach@66: 
jtulach@66: package api.usage.twodotzero;
jtulach@66: 
jtulach@66: import api.Writer;
jtulach@66: import java.io.IOException;
jtulach@66: import java.util.concurrent.atomic.AtomicInteger;
jtulach@66: 
jtulach@66: /** Writer that counts the number of written in characters.
jtulach@66:  */
jtulach@66: public class CountingWriter implements Writer.ImplSeq {
jtulach@66:     private final AtomicInteger counter;
jtulach@66:     
jtulach@66:     private CountingWriter(AtomicInteger counter) {
jtulach@66:         this.counter = counter;
jtulach@66:     }
jtulach@66:     
jtulach@66:     public static Writer create(AtomicInteger result) {
jtulach@66:         return Writer.create(new CountingWriter(result));
jtulach@66:     }
jtulach@66: 
jtulach@66:     @Override
jtulach@66:     public void write(CharSequence csq) throws IOException {
jtulach@66:         counter.addAndGet(csq.length());
jtulach@66:     }
jtulach@66: 
jtulach@66:     @Override
jtulach@66:     public void flush() throws IOException {
jtulach@66:     }
jtulach@66: 
jtulach@66:     @Override
jtulach@66:     public void close() throws IOException {
jtulach@66:     }
jtulach@66: 
jtulach@66: }