public TableOnMergeHelper(
      StatementContext statementContext,
      OnTriggerMergeDesc onTriggerDesc,
      EventType triggeringEventType,
      String triggeringStreamName,
      InternalEventRouter internalEventRouter,
      TableMetadata tableMetadata)
      throws ExprValidationException {
    matched = new ArrayList<TableOnMergeMatch>();
    unmatched = new ArrayList<TableOnMergeMatch>();

    int count = 1;
    boolean hasDeleteAction = false;
    boolean hasInsertIntoTableAction = false;
    boolean hasUpdateAction = false;
    for (OnTriggerMergeMatched matchedItem : onTriggerDesc.getItems()) {
      List<TableOnMergeAction> actions = new ArrayList<TableOnMergeAction>();
      for (OnTriggerMergeAction item : matchedItem.getActions()) {
        try {
          if (item instanceof OnTriggerMergeActionInsert) {
            OnTriggerMergeActionInsert insertDesc = (OnTriggerMergeActionInsert) item;
            TableOnMergeActionIns action =
                setupInsert(
                    tableMetadata,
                    internalEventRouter,
                    count,
                    insertDesc,
                    triggeringEventType,
                    triggeringStreamName,
                    statementContext);
            actions.add(action);
            hasInsertIntoTableAction = action.isInsertIntoBinding();
          } else if (item instanceof OnTriggerMergeActionUpdate) {
            OnTriggerMergeActionUpdate updateDesc = (OnTriggerMergeActionUpdate) item;
            EventBeanUpdateHelper updateHelper =
                EventBeanUpdateHelperFactory.make(
                    tableMetadata.getTableName(),
                    tableMetadata.getInternalEventType(),
                    updateDesc.getAssignments(),
                    onTriggerDesc.getOptionalAsName(),
                    triggeringEventType,
                    false);
            ExprEvaluator filterEval =
                updateDesc.getOptionalWhereClause() == null
                    ? null
                    : updateDesc.getOptionalWhereClause().getExprEvaluator();
            TableUpdateStrategy tableUpdateStrategy =
                statementContext
                    .getTableService()
                    .getTableUpdateStrategy(tableMetadata, updateHelper, true);
            TableOnMergeActionUpd upd = new TableOnMergeActionUpd(filterEval, tableUpdateStrategy);
            actions.add(upd);
            statementContext
                .getTableService()
                .addTableUpdateStrategyReceiver(
                    tableMetadata, statementContext.getStatementName(), upd, updateHelper, true);
            hasUpdateAction = true;
          } else if (item instanceof OnTriggerMergeActionDelete) {
            OnTriggerMergeActionDelete deleteDesc = (OnTriggerMergeActionDelete) item;
            ExprEvaluator filterEval =
                deleteDesc.getOptionalWhereClause() == null
                    ? null
                    : deleteDesc.getOptionalWhereClause().getExprEvaluator();
            actions.add(new TableOnMergeActionDel(filterEval));
            hasDeleteAction = true;
          } else {
            throw new IllegalArgumentException(
                "Invalid type of merge item '" + item.getClass() + "'");
          }
          count++;
        } catch (ExprValidationException ex) {
          boolean isNot = item instanceof OnTriggerMergeActionInsert;
          String message =
              "Validation failed in when-"
                  + (isNot ? "not-" : "")
                  + "matched (clause "
                  + count
                  + "): "
                  + ex.getMessage();
          throw new ExprValidationException(message, ex);
        }
      }

      if (matchedItem.isMatchedUnmatched()) {
        matched.add(new TableOnMergeMatch(matchedItem.getOptionalMatchCond(), actions));
      } else {
        unmatched.add(new TableOnMergeMatch(matchedItem.getOptionalMatchCond(), actions));
      }
    }

    // since updates may change future secondary keys
    requiresWriteLock = hasDeleteAction || hasInsertIntoTableAction || hasUpdateAction;
  }
  public NamedWindowOnMergeHelper(
      StatementContext statementContext,
      OnTriggerMergeDesc onTriggerDesc,
      EventType triggeringEventType,
      String triggeringStreamName,
      InternalEventRouter internalEventRouter,
      String namedWindowName,
      EventTypeSPI namedWindowType)
      throws ExprValidationException {
    matched = new ArrayList<NamedWindowOnMergeMatch>();
    unmatched = new ArrayList<NamedWindowOnMergeMatch>();

    int count = 1;
    for (OnTriggerMergeMatched matchedItem : onTriggerDesc.getItems()) {
      List<NamedWindowOnMergeAction> actions = new ArrayList<NamedWindowOnMergeAction>();
      for (OnTriggerMergeAction item : matchedItem.getActions()) {
        try {
          if (item instanceof OnTriggerMergeActionInsert) {
            OnTriggerMergeActionInsert insertDesc = (OnTriggerMergeActionInsert) item;
            actions.add(
                setupInsert(
                    namedWindowName,
                    internalEventRouter,
                    namedWindowType,
                    count,
                    insertDesc,
                    triggeringEventType,
                    triggeringStreamName,
                    statementContext));
          } else if (item instanceof OnTriggerMergeActionUpdate) {
            OnTriggerMergeActionUpdate updateDesc = (OnTriggerMergeActionUpdate) item;
            EventBeanUpdateHelper updateHelper =
                EventBeanUpdateHelperFactory.make(
                    namedWindowName,
                    namedWindowType,
                    updateDesc.getAssignments(),
                    onTriggerDesc.getOptionalAsName(),
                    triggeringEventType,
                    true);
            ExprEvaluator filterEval =
                updateDesc.getOptionalWhereClause() == null
                    ? null
                    : updateDesc.getOptionalWhereClause().getExprEvaluator();
            actions.add(new NamedWindowOnMergeActionUpd(filterEval, updateHelper));
          } else if (item instanceof OnTriggerMergeActionDelete) {
            OnTriggerMergeActionDelete deleteDesc = (OnTriggerMergeActionDelete) item;
            ExprEvaluator filterEval =
                deleteDesc.getOptionalWhereClause() == null
                    ? null
                    : deleteDesc.getOptionalWhereClause().getExprEvaluator();
            actions.add(new NamedWindowOnMergeActionDel(filterEval));
          } else {
            throw new IllegalArgumentException(
                "Invalid type of merge item '" + item.getClass() + "'");
          }
          count++;
        } catch (ExprValidationException ex) {
          boolean isNot = item instanceof OnTriggerMergeActionInsert;
          String message =
              "Validation failed in when-"
                  + (isNot ? "not-" : "")
                  + "matched (clause "
                  + count
                  + "): "
                  + ex.getMessage();
          throw new ExprValidationException(message, ex);
        }
      }

      if (matchedItem.isMatchedUnmatched()) {
        matched.add(new NamedWindowOnMergeMatch(matchedItem.getOptionalMatchCond(), actions));
      } else {
        unmatched.add(new NamedWindowOnMergeMatch(matchedItem.getOptionalMatchCond(), actions));
      }
    }
  }