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.postgresql;
  
  import org.opencms.setup.CmsSetupDBWrapper;
  import org.opencms.setup.CmsSetupDb;
  
  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;
  
  /**
   * PostgreSQL implementation to drop the old indexes from the database.<p>
   *
   * @since 7.0.2
   */
  public class CmsUpdateDBDropOldIndexes extends org.opencms.setup.db.update6to7.CmsUpdateDBDropOldIndexes {
  
      /** Constant for the sql query to drop a unique index key. */
      private static final String QUERY_DROP_CONSTRAINT = "Q_DROP_CONSTRAINT";
  
      /** Constant for the SQL query properties.<p> */
      private static final String QUERY_PROPERTY_FILE_ORACLE = "postgresql/cms_drop_all_indexes_queries.properties";
  
      /** Constant for the sql query to list constraints for a table. */
      private static final String QUERY_SHOW_CONSTRAINTS = "Q_SHOW_CONSTRAINTS";
  
      /** Constant for the replacement of the index name. */
      private static final String REPLACEMENT_INDEX_ORACLE = "${indexname}";
  
      /** Constant array of the temporary indexes. */
      private static final String[] TEMP_INDEXES = {
          "CMS_BACKUP_CONTENTS_INDEX_1",
          "CMS_BACKUP_CONTENTS_INDEX_2",
          "CMS_BACKUP_PROJECTRESOURCES_INDEX_1",
          "CMS_BACKUP_PROJECTS_INDEX_1",
          "CMS_BACKUP_PROJECTS_INDEX_2",
          "CMS_BACKUP_PROJECTS_INDEX_3",
          "CMS_BACKUP_PROJECTS_INDEX_4",
          "CMS_BACKUP_PROJECTS_INDEX_5",
          "CMS_BACKUP_PROJECTS_INDEX_6",
          "CMS_BACKUP_PROPERTIES_INDEX_1",
          "CMS_BACKUP_PROPERTIES_INDEX_2",
          "CMS_BACKUP_PROPERTIES_INDEX_3",
          "CMS_BACKUP_PROPERTYDEF_INDEX_1",
          "CMS_BACKUP_RESOURCES_INDEX_1",
          "CMS_BACKUP_RESOURCES_INDEX_2",
          "CMS_BACKUP_RESOURCES_INDEX_3",
          "CMS_BACKUP_RESOURCES_INDEX_4",
          "CMS_BACKUP_RESOURCES_INDEX_5",
          "CMS_BACKUP_STRUCTURE_INDEX_1",
          "CMS_BACKUP_STRUCTURE_INDEX_2",
          "CMS_BACKUP_STRUCTURE_INDEX_3",
          "CMS_BACKUP_STRUCTURE_INDEX_4",
          "CMS_GROUPS_INDEX_1",
          "CMS_OFFLINE_CONTENTS_INDEX_1",
          "CMS_OFFLINE_RESOURCES_INDEX_1",
          "CMS_OFFLINE_RESOURCES_INDEX_2",
          "CMS_OFFLINE_RESOURCES_INDEX_3",
          "CMS_OFFLINE_RESOURCES_INDEX_4",
          "CMS_OFFLINE_STRUCTURE_INDEX_1",
          "CMS_OFFLINE_STRUCTURE_INDEX_2",
          "CMS_OFFLINE_STRUCTURE_INDEX_3",
          "CMS_ONLINE_CONTENTS_INDEX_1",
          "CMS_ONLINE_RESOURCES_INDEX_1",
          "CMS_ONLINE_RESOURCES_INDEX_2",
          "CMS_ONLINE_RESOURCES_INDEX_3",
          "CMS_ONLINE_RESOURCES_INDEX_4",
          "CMS_ONLINE_STRUCTURE_INDEX_1",
          "CMS_ONLINE_STRUCTURE_INDEX_2",
          "CMS_ONLINE_STRUCTURE_INDEX_3",
          "CMS_PROJECTRESOURCES_INDEX_1",
          "CMS_PROJECTS_INDEX_1",
          "CMS_PROJECTS_INDEX_2",
          "CMS_PROJECTS_INDEX_3",
          "CMS_PROJECTS_INDEX_4",
          "CMS_PUBLISH_HISTORY_INDEX_1",
          "CMS_PUBLISH_HISTORY_INDEX_2"};
  
      /** Constant Array List of the temporary indexes. */
      private static final List<String> TEMP_INDEXES_LIST = Collections.unmodifiableList(Arrays.asList(TEMP_INDEXES));
  
      /**
       * Constructor.<p>
       *
       * @throws IOException if the sql queries properties file could not be read
       */
      public CmsUpdateDBDropOldIndexes()
      throws IOException {
  
          super();
          loadQueryProperties(getPropertyFileLocation() + QUERY_PROPERTY_FILE_ORACLE);
      }
  
      // No implementation yet
  
      /**
       * @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();) {
              // In the PostgreSQL catalog,  table names are in lower case
              String tablename = tableIterator.next().toLowerCase();
              System.out.println("dropping indexes for table " + tablename);
              // Check if the table is existing
              if (dbCon.hasTableOrColumn(tablename, null)) {
                  try {
  
                      // First drop constraints
                      List<String> constraints = getConstraints(dbCon, tablename);
                      Iterator<String> iter = constraints.iterator();
                      while (iter.hasNext()) {
                          String constraint = iter.next();
  
                          String dropConstraint = readQuery(QUERY_DROP_CONSTRAINT);
                          Map<String, String> replacer = new HashMap<String, String>();
                          replacer.put(REPLACEMENT_TABLENAME, tablename);
                          replacer.put(REPLACEMENT_INDEX_ORACLE, constraint);
                          dbCon.updateSqlStatement(dropConstraint, replacer, null);
                      }
  
                      // Drop the indexes from the table.
                      List<String> indexes = getIndexes(dbCon, tablename);
                      iter = indexes.iterator();
                      while (iter.hasNext()) {
                          String index = iter.next();
  
                          // Drop the index
                          String dropIndex = readQuery(QUERY_DROP_INDEX);
                          Map<String, String> replacerIndex = new HashMap<String, String>();
                          replacerIndex.put(REPLACEMENT_INDEX_ORACLE, index);
                          dbCon.updateSqlStatement(dropIndex, replacerIndex, null);
                      }
                  } catch (SQLException e) {
                      e.printStackTrace();
                  }
              }
          }
  
          // Create the temporary indexes
          // Each index must be created in its own query
          for (Iterator<String> tempIndexes = TEMP_INDEXES_LIST.iterator(); tempIndexes.hasNext();) {
              try {
                  String createIndex = tempIndexes.next();
                  String creationQuery = readQuery(createIndex);
                  dbCon.updateSqlStatement(creationQuery, null, null);
              } catch (SQLException e) {
                  e.printStackTrace();
              }
          }
      }
  
      /**
       * Gets the constraints for a table.<p>
       *
       * @param dbCon the db connection interface
       * @param tablename the table to get the indexes from
       *
       * @return a list of constraints
       *
       * @throws SQLException if something goes wrong
       */
      private List<String> getConstraints(CmsSetupDb dbCon, String tablename) throws SQLException {
  
          List<String> constraints = new ArrayList<String>();
          String tableConstraints = readQuery(QUERY_SHOW_CONSTRAINTS);
          Map<String, String> replacer = new HashMap<String, String>();
          replacer.put(REPLACEMENT_TABLENAME, tablename);
          CmsSetupDBWrapper db = null;
          try {
              db = dbCon.executeSqlStatement(tableConstraints, replacer);
              while (db.getResultSet().next()) {
                  String constraint = db.getResultSet().getString(1);
                  if (!constraints.contains(constraint)) {
                      constraints.add(constraint);
                  }
  
              }
          } finally {
              if (db != null) {
                  db.close();
              }
          }
  
          return constraints;
      }
  
      /**
       * 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 something 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(1);
                  if (!indexes.contains(index)) {
                      indexes.add(index);
                  }
              }
          } finally {
              if (db != null) {
                  db.close();
              }
          }
          return indexes;
      }
  }
  