org.reactivestreams.example.unicast.NumberIterablePublisher Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of reactive-streams-examples Show documentation

A Protocol for Asynchronous Non-Blocking Data Sequence

There is a newer version: 1.0.4

Show newest version

/************************************************************************
* Licensed under Public Domain (CC0)                                    *
*                                                                       *
* To the extent possible under law, the person who associated CC0 with  *
* this code has waived all copyright and related or neighboring         *
* rights to this code.                                                  *
*                                                                       *
* You should have received a copy of the CC0 legalcode along with this  *
* work. If not, see .*
************************************************************************/

package org.reactivestreams.example.unicast;

import java.util.Collections;
import java.util.Iterator;
import java.util.concurrent.Executor;
import org.reactivestreams.Subscription;
import org.reactivestreams.Subscriber;
import org.reactivestreams.Publisher;

public class NumberIterablePublisher extends AsyncIterablePublisher {
    public NumberIterablePublisher(final int from, final int to, final Executor executor) {
        super(new Iterable() {
          { if(from > to) throw new IllegalArgumentException("from must be equal or greater than to!"); }
          @Override public Iterator iterator() {
            return new Iterator() {
              private int at = from;
              @Override public boolean hasNext() { return at < to; }
              @Override public Integer next() {
                if (!hasNext()) return Collections.emptyList().iterator().next();
                else return at++;
              }
              @Override public void remove() { throw new UnsupportedOperationException(); }
            };
          }
        }, executor);
    }
}