SingletonIterator.java

package xapi.collect.impl;

import java.util.Iterator;

public class SingletonIterator <X> implements Iterable<X>{

  private final class Iter implements Iterator<X> {
    private X object;

    public Iter(X object) {
      this.object = object;
    }

    @Override
    public boolean hasNext() {
      return object != null;
    }

    @Override
    public X next() {
      try {
        return object;
      } finally {
        object = null;
      }
    }

    @Override
    public void remove() {
      object = null;
    }
  }

  private final X singleton;

  public SingletonIterator(X singleton) {
    this.singleton = singleton;
  }

  @Override
  public Iterator<X> iterator() {
    return new Iter(singleton);
  }

}