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   *   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
   *
   *    https://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.cayenne;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Iterator;
  import java.util.List;
  
  /**
   * A ResultIterator over a collection of objects.
   * 
   * @since 4.0
   */
  class CollectionResultIterator<T> implements ResultIterator<T> {
  
      protected Iterator<T> iterator;
  
      public CollectionResultIterator(Collection<T> c) {
          this.iterator = c.iterator();
      }
  
      @Override
      public Iterator<T> iterator() {
          checkIterator();
          return iterator;
      }
  
      @Override
      public List<T> allRows() {
  
          List<T> list = new ArrayList<>();
          for (T t : this) {
              list.add(t);
          }
  
          return list;
      }
  
      @Override
      public boolean hasNextRow() {
          checkIterator();
          return iterator.hasNext();
      }
  
      @Override
      public T nextRow() {
          checkIterator();
          return iterator.next();
      }
  
      @Override
      public void skipRow() {
          checkIterator();
          iterator.next();
      }
  
      @Override
      public void close() {
          iterator = null;
      }
  
      protected void checkIterator() {
          if (iterator == null) {
              throw new IllegalStateException("Iterator is closed");
          }
      }
  
  }
  