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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
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   *
   *    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
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  package org.apache.cayenne.util;
  
  import org.apache.cayenne.CayenneRuntimeException;
  import org.apache.cayenne.QueryResult;
  import org.apache.cayenne.QueryResultItem;
  
  import java.util.Iterator;
  import java.util.List;
  
  /**
   * Generic implementation of QueryResult using List as QueryResultItem storage.
   *
   * @since 4.0
   */
  public class GenericQueryResult<T> implements QueryResult<T> {
  
      protected Class<T> resultClass;
      protected List<QueryResultItem> resultItems;
  
      public GenericQueryResult(List<QueryResultItem> resultItems) {
          this.resultItems = resultItems;
      }
  
      public GenericQueryResult(List<QueryResultItem> resultItems, Class<T> resultClass) {
          this(resultItems);
          this.resultClass = resultClass;
      }
  
      @Override
      public int size() {
          return resultItems.size();
      }
  
      @Override
      public boolean isList() {
          for (QueryResultItem item : resultItems) {
              if (item.isSelectResult()) {
                  return true;
              }
          }
          return false;
      }
  
      @SuppressWarnings("unchecked")
      @Override
      public List<T> firstList() {
          for (QueryResultItem item : resultItems) {
              if (item.isSelectResult()) {
                  return item.getSelectResult();
              }
          }
  
          throw new CayenneRuntimeException("Result is not a select result.");
      }
  
      @Override
      public int[] firstBatchUpdateCount() {
          for (QueryResultItem item : resultItems) {
              if (!item.isSelectResult()) {
                  return item.getBatchUpdateCounts();
              }
          }
  
          throw new CayenneRuntimeException("Result is not a batch update count.");
      }
  
      @Override
      public int firstUpdateCount() {
          for (QueryResultItem item : resultItems) {
              if (!item.isSelectResult()) {
                  return item.getUpdateCount();
              }
          }
  
          throw new CayenneRuntimeException("Result is not an update count.");
      }
  
      @Override
      public Iterator<QueryResultItem> iterator() {
          return resultItems.iterator();
      }
  }
  