content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * 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 com.alibaba.druid.util;
  
  import org.postgresql.core.BaseConnection;
  import org.postgresql.xa.PGXAConnection;
  
  import javax.sql.XAConnection;
  
  import java.sql.Connection;
  import java.sql.ResultSet;
  import java.sql.SQLException;
  import java.sql.Statement;
  import java.util.*;
  
  public class PGUtils {
      public static XAConnection createXAConnection(Connection physicalConn) throws SQLException {
          return new PGXAConnection((BaseConnection) physicalConn);
      }
  
      public static List<String> showTables(Connection conn) throws SQLException {
          List<String> tables = new ArrayList<String>();
  
          Statement stmt = null;
          ResultSet rs = null;
          try {
              stmt = conn.createStatement();
              rs = stmt.executeQuery("SELECT tablename FROM pg_catalog.pg_tables where schemaname not in ('pg_catalog', 'information_schema', 'sys')");
              while (rs.next()) {
                  String tableName = rs.getString(1);
                  tables.add(tableName);
              }
          } finally {
              JdbcUtils.close(rs);
              JdbcUtils.close(stmt);
          }
  
          return tables;
      }
  
      private static Set<String> keywords;
  
      public static boolean isKeyword(String name) {
          if (name == null) {
              return false;
          }
  
          String name_lower = name.toLowerCase();
  
          Set<String> words = keywords;
  
          if (words == null) {
              words = new HashSet<String>();
              Utils.loadFromFile("META-INF/druid/parser/postgresql/keywords", words);
              keywords = words;
          }
  
          return words.contains(name_lower);
      }
  
      private static final long[] pseudoColumnHashCodes;
  
      static {
          long[] array = {
                  FnvHash.Constants.CURRENT_TIMESTAMP
          };
          Arrays.sort(array);
          pseudoColumnHashCodes = array;
      }
  
      public static boolean isPseudoColumn(long hash) {
          return Arrays.binarySearch(pseudoColumnHashCodes, hash) >= 0;
      }
  }
  