content: /*
   * This library is part of OpenCms -
   * the Open Source Content Management System
   *
   * Copyright (c) Alkacon Software GmbH & Co. KG (https://www.alkacon.com)
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
   * Lesser General Public License for more details.
   *
   * For further information about Alkacon Software GmbH & Co. KG, please see the
   * company website: https://www.alkacon.com
   *
   * For further information about OpenCms, please see the
   * project website: https://www.opencms.org
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */
  
  package org.opencms.setup.db.update6to7;
  
  import org.opencms.setup.CmsSetupDBWrapper;
  import org.opencms.setup.CmsSetupDb;
  import org.opencms.setup.db.A_CmsUpdateDBPart;
  import org.opencms.util.CmsStringUtil;
  
  import java.io.IOException;
  import java.sql.SQLException;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  
  /**
   * This class drops all indexes of each table of the database.<p>
   * This is done so that the indexes can be updated to the version 6.2.3 and afterwards to version 7
   *
   * @since 7.0.0
   */
  public class CmsUpdateDBDropOldIndexes extends A_CmsUpdateDBPart {
  
      /** Constant array of the base tables of the OpenCms 7.0.x installation.<p> */
      protected static final String[] CMS_TABLES = {
          "CMS_BACKUP_CONTENTS",
          "CMS_BACKUP_PROJECTRESOURCES",
          "CMS_BACKUP_PROJECTS",
          "CMS_BACKUP_PROPERTIES",
          "CMS_BACKUP_PROPERTYDEF",
          "CMS_BACKUP_RESOURCES",
          "CMS_BACKUP_STRUCTURE",
          "CMS_GROUPS",
          "CMS_GROUPUSERS",
          "CMS_OFFLINE_ACCESSCONTROL",
          "CMS_OFFLINE_CONTENTS",
          "CMS_OFFLINE_PROPERTIES",
          "CMS_OFFLINE_PROPERTYDEF",
          "CMS_OFFLINE_RESOURCES",
          "CMS_OFFLINE_STRUCTURE",
          "CMS_ONLINE_ACCESSCONTROL",
          "CMS_ONLINE_CONTENTS",
          "CMS_ONLINE_PROPERTIES",
          "CMS_ONLINE_PROPERTYDEF",
          "CMS_ONLINE_RESOURCES",
          "CMS_ONLINE_STRUCTURE",
          "CMS_PROJECTRESOURCES",
          "CMS_PROJECTS",
          "CMS_PUBLISH_HISTORY",
          "CMS_STATICEXPORT_LINKS",
          "CMS_SYSTEMID",
          "CMS_TASK",
          "CMS_TASKLOG",
          "CMS_TASKPAR",
          "CMS_TASKTYPE",
          "CMS_USERS",
  
      };
  
      /** Constant ArrayList of the tables of the base OpenCms 7.0.x installation.<p> */
      protected static final List<String> CMS_TABLES_LIST = Collections.unmodifiableList(Arrays.asList(CMS_TABLES));
  
      /** Constant for the sql query to drop an index from a table.<p> */
      protected static final String QUERY_DROP_INDEX = "Q_DROP_INDEX";
  
      /** Constant for the sql query to show the indexes of a table.<p> */
      protected static final String QUERY_SHOW_INDEX = "Q_SHOW_INDEXES";
  
      /** Constant for the sql query replacement of the tablename.<p> */
      protected static final String REPLACEMENT_TABLENAME = "${tablename}";
  
      /** Constant for the field of the index name.<p> */
      private static final String FIELD_INDEX = "KEY_NAME";
  
      /** Constant for the primary key of a the index result set.<p> */
      private static final String PRIMARY_KEY = "PRIMARY";
  
      /** Constant for the SQL query properties.<p> */
      private static final String QUERY_PROPERTY_FILE = "cms_drop_all_indexes_queries.properties";
  
      /** Constant for the sql query replacement of the index.<p> */
      private static final String REPLACEMENT_INDEX = "${dropindexes}";
  
      /**
       * Constructor.<p>
       *
       * @throws IOException if the query properties cannot be read
       */
      public CmsUpdateDBDropOldIndexes()
      throws IOException {
  
          super();
          loadQueryProperties(getPropertyFileLocation() + QUERY_PROPERTY_FILE);
      }
  
      /**
       * @see org.opencms.setup.db.A_CmsUpdateDBPart#internalExecute(org.opencms.setup.CmsSetupDb)
       */
      @Override
      protected void internalExecute(CmsSetupDb dbCon) {
  
          List<String> tablenames = CMS_TABLES_LIST;
  
          // Iterate over all the tables.
          for (Iterator<String> tableIterator = tablenames.iterator(); tableIterator.hasNext();) {
              String tablename = tableIterator.next();
              System.out.println("dropping indexes for table " + tablename);
              // Check if the table is existing
              if (dbCon.hasTableOrColumn(tablename, null)) {
                  try {
                      List<String> indexes = getIndexes(dbCon, tablename);
  
                      // Iterate over the indexes of one table
                      StringBuffer buffer = new StringBuffer();
                      for (Iterator<String> indexIt = indexes.iterator(); indexIt.hasNext();) {
                          String index = indexIt.next();
                          // Drop the primary key
                          if (index.equalsIgnoreCase(PRIMARY_KEY)) {
                              buffer.append("DROP PRIMARY KEY");
                              if (indexIt.hasNext()) {
                                  buffer.append(",");
                              }
                          } else {
                              // Drop the index
                              buffer.append(" DROP INDEX ");
                              buffer.append(index);
                              if (indexIt.hasNext()) {
                                  buffer.append(",");
                              }
                          }
                      }
                      String tempIndex = readQuery(tablename);
                      if (CmsStringUtil.isNotEmptyOrWhitespaceOnly(tempIndex)) {
                          buffer.append(", ");
                          buffer.append(tempIndex);
                      }
  
                      // Only execute the query if there is something to change
                      if (CmsStringUtil.isNotEmptyOrWhitespaceOnly(buffer.toString())) {
                          String dropIndexQuery = readQuery(QUERY_DROP_INDEX);
                          Map<String, String> replacer = new HashMap<String, String>();
                          replacer.put(REPLACEMENT_TABLENAME, tablename);
                          replacer.put(REPLACEMENT_INDEX, buffer.toString());
                          // Drop the indexes
                          try {
                              dbCon.updateSqlStatement(dropIndexQuery, replacer, null);
                          } catch (SQLException e) {
                              e.printStackTrace();
                          }
                      }
  
                  } catch (SQLException e) {
                      e.printStackTrace();
                  }
              }
          }
      }
  
      /**
       * Gets the indexes for a table.<p>
       *
       * @param dbCon the db connection interface
       * @param tablename the table to get the indexes from
       *
       * @return a list of indexes
       *
       * @throws SQLException if somehting goes wrong
       */
      private List<String> getIndexes(CmsSetupDb dbCon, String tablename) throws SQLException {
  
          List<String> indexes = new ArrayList<String>();
          String tableIndex = readQuery(QUERY_SHOW_INDEX);
          Map<String, String> replacer = new HashMap<String, String>();
          replacer.put(REPLACEMENT_TABLENAME, tablename);
          CmsSetupDBWrapper db = null;
          try {
              db = dbCon.executeSqlStatement(tableIndex, replacer);
              while (db.getResultSet().next()) {
                  String index = db.getResultSet().getString(FIELD_INDEX);
  
                  if (!indexes.contains(index)) {
                      indexes.add(index);
                  }
  
              }
          } finally {
              if (db != null) {
                  db.close();
              }
          }
          return indexes;
      }
  }