content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements. See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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 org.apache.activemq.artemis.utils.collections;
  
  import java.util.Iterator;
  import java.util.NoSuchElementException;
  import java.util.function.Consumer;
  
  public class SingletonIterator<E> implements Iterator<E> {
  
     private E value;
  
     public static <E> Iterator<E> newInstance(E e) {
        return new SingletonIterator<>(e);
     }
  
     private SingletonIterator(E value) {
        this.value = value;
     }
  
     @Override
     public boolean hasNext() {
        return value != null;
     }
  
     @Override
     public E next() {
        if (value != null) {
           E result = value;
           value = null;
           return result;
        } else {
           throw new NoSuchElementException();
        }
     }
  
     @Override
     public void remove() {
        value = null;
     }
  
     @Override
     public void forEachRemaining(Consumer<? super E> action) {
        if (value != null)
           action.accept(value);
     }
  }
  