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.Collection;
  
  /**
   * Provides an Array Iterator that is able to reset, allowing you to iterate over the full array. It achieves this
   * though by moving end position mark to the the current cursors position, so it round robins, even with reset.
   */
  public class ArrayResettableIterator<E> implements ResettableIterator<E> {
  
     private final Object[] array;
     private int cursor = 0;
     private int endPos = -1;
     private boolean hasNext;
  
     public ArrayResettableIterator(Object[] array) {
        this.array = array;
        reset();
     }
  
     public static <E> ResettableIterator<E> iterator(Collection<E> collection) {
        return new ArrayResettableIterator<>(collection.toArray());
     }
  
     @Override
     public void reset() {
        endPos = cursor;
        hasNext = array.length > 0;
     }
  
     @Override
     public boolean hasNext() {
        return hasNext;
     }
  
     @Override
     public E next() {
        if (!hasNext) {
           throw new IllegalStateException();
        }
        @SuppressWarnings("unchecked")
        E result = (E) array[cursor];
        cursor++;
        if (cursor == array.length) {
           cursor = 0;
        }
        if (cursor == endPos) {
           hasNext = false;
        }
        return result;
     }
  }