protected void alterColumnNotnull(DdlWrite writer, AlterColumn alter) throws IOException {

    String ddl =
        platformDdl.alterColumnNotnull(
            alter.getTableName(), alter.getColumnName(), alter.isNotnull());
    if (hasValue(ddl)) {
      writer.apply().append(ddl).endOfStatement();
    }
  }
  /** Add all the appropriate changes based on the column changes. */
  @Override
  public void generate(DdlWrite writer, AlterColumn alterColumn) throws IOException {

    if (isTrue(alterColumn.isHistoryExclude())) {
      regenerateHistoryTriggers(
          alterColumn.getTableName(),
          HistoryTableUpdate.Change.EXCLUDE,
          alterColumn.getColumnName());
    } else if (isFalse(alterColumn.isHistoryExclude())) {
      regenerateHistoryTriggers(
          alterColumn.getTableName(),
          HistoryTableUpdate.Change.INCLUDE,
          alterColumn.getColumnName());
    }

    if (hasValue(alterColumn.getDropForeignKey())) {
      alterColumnDropForeignKey(writer, alterColumn);
    }
    if (hasValue(alterColumn.getReferences())) {
      alterColumnAddForeignKey(writer, alterColumn);
    }

    if (hasValue(alterColumn.getDropUnique())) {
      alterColumnDropUniqueConstraint(writer, alterColumn);
    }
    if (hasValue(alterColumn.getUnique())) {
      alterColumnAddUniqueConstraint(writer, alterColumn);
    }
    if (hasValue(alterColumn.getUniqueOneToOne())) {
      alterColumnAddUniqueOneToOneConstraint(writer, alterColumn);
    }

    boolean alterBaseAttributes = false;
    if (hasValue(alterColumn.getType())) {
      alterColumnType(writer, alterColumn);
      alterBaseAttributes = true;
    }
    if (hasValue(alterColumn.getDefaultValue())) {
      alterColumnDefaultValue(writer, alterColumn);
      alterBaseAttributes = true;
    }
    if (alterColumn.isNotnull() != null) {
      alterColumnNotnull(writer, alterColumn);
      alterBaseAttributes = true;
    }

    if (alterBaseAttributes) {
      alterColumnBaseAttributes(writer, alterColumn);
    }
  }