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   *  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
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  package org.apache.cayenne.access.util;
  
  import org.apache.cayenne.ResultIterator;
  import org.apache.cayenne.access.OperationObserver;
  import org.apache.cayenne.query.Query;
  import org.apache.cayenne.util.Util;
  
  import java.io.PrintWriter;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  /**
   * Simple implementation of OperationObserver interface. Useful as a superclass
   * of other implementations of OperationObserver. This implementation only
   * tracks transaction events and exceptions.
   * <p>
   * <i>This operation observer is unsafe to use in application, since it doesn't
   * rethrow the exceptions immediately, and may cause the database to hang.</i>
   * </p>
   * 
   */
  public class DefaultOperationObserver implements OperationObserver {
  
      protected List<Throwable> globalExceptions = new ArrayList<>();
      protected Map<Query, Throwable> queryExceptions = new HashMap<>();
  
      /**
       * Prints the information about query and global exceptions.
       */
      public void printExceptions(PrintWriter out) {
          if (globalExceptions.size() > 0) {
              if (globalExceptions.size() == 1) {
                  out.println("Global Exception:");
              } else {
                  out.println("Global Exceptions:");
              }
  
              for (final Throwable th : globalExceptions) {
                  th.printStackTrace(out);
              }
          }
  
          if (queryExceptions.size() > 0) {
              if (queryExceptions.size() == 1) {
                  out.println("Query Exception:");
              } else {
                  out.println("Query Exceptions:");
              }
  
              for (final Query query : queryExceptions.keySet()) {
                  Throwable th = queryExceptions.get(query);
                  th.printStackTrace(out);
              }
          }
      }
  
      /**
       * Returns a list of global exceptions that occured during data operation
       * run.
       */
      public List<Throwable> getGlobalExceptions() {
          return globalExceptions;
      }
  
      /**
       * Returns a list of exceptions that occured during data operation run by
       * query.
       */
      public Map<Query, Throwable> getQueryExceptions() {
          return queryExceptions;
      }
  
      /**
       * Returns <code>true</code> if at least one exception was registered during
       * query execution.
       */
      public boolean hasExceptions() {
          return globalExceptions.size() > 0 || queryExceptions.size() > 0;
      }
  
      public void nextCount(Query query, int resultCount) {
      }
  
      public void nextBatchCount(Query query, int[] resultCount) {
  
      }
  
      public void nextRows(Query query, List<?> dataRows) {
          // noop
      }
  
      /**
       * Closes ResultIterator without reading its data. If you implement a custom
       * subclass, only call super if closing the iterator is what you need.
       */
      public void nextRows(Query query, ResultIterator it) {
          if (it != null) {
              it.close();
          }
      }
  
      /**
       * Closes ResultIterator without reading its data. If you implement a custom
       * subclass, only call super if closing the iterator is what you need.
       * 
       * @since 4.0
       */
      public void nextGeneratedRows(Query query, ResultIterator<?> keys, List<org.apache.cayenne.ObjectId> idsToUpdate) {
          if (keys != null) {
              keys.close();
          }
      }
  
      public void nextQueryException(Query query, Exception ex) {
          queryExceptions.put(query, Util.unwindException(ex));
      }
  
      public void nextGlobalException(Exception ex) {
          globalExceptions.add(Util.unwindException(ex));
      }
  
      /**
       * Returns <code>false</code>.
       */
      public boolean isIteratedResult() {
          return false;
      }
  }
  