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There is a newer version: 2.0.0-rc-1

/*
 * Copyright 2014 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package ratpack.stream.internal;

import org.reactivestreams.Publisher;
import org.reactivestreams.Subscriber;
import org.reactivestreams.Subscription;

import java.util.Iterator;

public class IterablePublisher implements Publisher {

  private final Iterable iterable;

  public IterablePublisher(Iterable iterable) {
    this.iterable = iterable;
  }

  @Override
  public void subscribe(final Subscriber subscriber) {
    subscriber.onSubscribe(new Subscription() {

      Iterator iterator = iterable.iterator();

      @Override
      public void request(int n) {
        for (int i = 0; i < n; ++i) {
          if (iterator.hasNext()) {
            T next;
            try {
              next = iterator.next();
            } catch (Exception e) {
              subscriber.onError(e);
              return;
            }
            subscriber.onNext(next);
          } else {
            break;
          }
        }

        if (!iterator.hasNext()) {
          subscriber.onComplete();
        }
      }

      @Override
      public void cancel() {

      }
    });

  }
}