content: /**
   * JBoss, Home of Professional Open Source
   * Copyright Red Hat, Inc., and individual contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * 	http://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 "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.jboss.aerogear.unifiedpush.migrator;
  
  import liquibase.change.custom.CustomTaskChange;
  import liquibase.database.Database;
  import liquibase.database.jvm.JdbcConnection;
  import liquibase.exception.CustomChangeException;
  import liquibase.exception.SetupException;
  import liquibase.exception.ValidationErrors;
  import liquibase.resource.ResourceAccessor;
  
  import java.sql.*;
  import java.util.ArrayList;
  import java.util.List;
  
  public class CategoriesMigration implements CustomTaskChange {
      private String confirmationMessage;
  
      @Override
      public String getConfirmationMessage() {
          return this.confirmationMessage;
      }
  
      @Override
      public void setUp() throws SetupException {
  
      }
  
      @Override
      public void setFileOpener(ResourceAccessor resourceAccessor) {
  
      }
  
      @Override
      public ValidationErrors validate(Database database) {
          return null;
      }
  
      @Override
      public void execute(Database database) throws CustomChangeException {
          try {
              Connection conn = ((JdbcConnection) (database.getConnection())).getWrappedConnection();
  
              DatabaseMetaData metaData = conn.getMetaData();
              ResultSet tables = metaData.getTables(null, null, null, null);
              boolean hasTable = false;
              while (tables.next()) {
                  String tableName = tables.getString(3);
                  if ("Installation_categories".equals(tableName) || "installation_categories".equals(tableName)) {
                      hasTable = true;
                  }
              }
  
              if (!hasTable) {
                  this.confirmationMessage = "table doesn't exists, skipping";
                  return;
              }
  
              ResultSet rs = conn.createStatement().executeQuery("select distinct categories from Installation_categories");
              List<String> categories = new ArrayList<>();
              while (rs.next()) {
                  String category = rs.getString(1);
                  categories.add(category);
              }
              rs.close();
              conn.setAutoCommit(false);
              PreparedStatement categoriesStatement = conn.prepareStatement("insert into category (id, name) values (?, ?)");
              long categoryCounter = 1;
              for (String category : categories) {
                  categoriesStatement.setLong(1, categoryCounter);
                  categoriesStatement.setString(2, category);
                  categoriesStatement.executeUpdate();
                  categoryCounter++;
              }
              categoriesStatement.close();
              if ("mysql".equals(database.getShortName())) {
                  PreparedStatement sequenceStatement = conn.prepareStatement("update category_seq set next_val = ? where next_val = ?");
                  sequenceStatement.setLong(1, categoryCounter + 1);
                  sequenceStatement.setLong(2, categoryCounter);
                  sequenceStatement.executeUpdate();
                  sequenceStatement.close();
              } else if ("postgresql".equals(database.getShortName())) {
                  Statement statement = conn.createStatement();
                  statement.executeUpdate("alter sequence category_seq restart with " + categoryCounter + 1);
                  statement.close();
              }
              conn.commit();
              this.confirmationMessage = categoryCounter + " categories migrated successfully";
          } catch (Exception e) {
              throw new CustomChangeException(e);
          }
      }
  }
  