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   *  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
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  package org.apache.cayenne.access;
  
  import org.apache.cayenne.CayenneRuntimeException;
  import org.apache.cayenne.ResultIterator;
  import org.apache.cayenne.tx.Transaction;
  
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  
  /**
   * Decorates ResultIterator to close active transaction when the iterator is
   * closed.
   * 
   * @since 1.2
   */
  final class TransactionResultIteratorDecorator<T> implements ResultIterator<T> {
  
      private ResultIterator<T> result;
      private Transaction tx;
  
      public TransactionResultIteratorDecorator(ResultIterator<T> result, Transaction tx) {
  
          // make sure it is still valid before proceeding with the iterator
          if(tx.isRollbackOnly()) {
              throw new CayenneRuntimeException("Transaction passed should be rolled back");
          }
  
          this.result = result;
          this.tx = tx;
      }
  
      @Override
      public Iterator<T> iterator() {
          return result.iterator();
      }
  
      /**
       * Closes the result and commits the transaction.
       */
      @Override
      public void close() {
  
          try {
              result.close();
  
              // we can safely commit here as the transaction is internal to this decorator, and we already checked
              // that it hasn't been rolled back in constructor.
              tx.commit();
          } catch (Exception e) {
              try {
                  tx.rollback();
              } catch (Exception rollbackEx) {
              }
  
              throw new CayenneRuntimeException(e);
          }
      }
  
      /**
       * @since 3.0
       */
      @Override
      public List<T> allRows() {
          List<T> list = new ArrayList<>();
  
          while (hasNextRow()) {
              list.add(nextRow());
          }
  
          return list;
      }
  
      @Override
      public boolean hasNextRow() {
          return result.hasNextRow();
      }
  
      /**
       * @since 3.0
       */
      @Override
      public T nextRow() {
          return result.nextRow();
      }
  
      /**
       * @since 3.0
       */
      @Override
      public void skipRow() {
          result.skipRow();
      }
  }
  