package liquibase.database.core;

 import liquibase.database.AbstractDatabase;

 import liquibase.database.DatabaseConnection;

 import liquibase.exception.DatabaseException;

 public class UnsupportedDatabase extends AbstractDatabase {

     public int getPriority() {

         return -1;

     }

     @Override

     public void setConnection(DatabaseConnection conn) {

         super.setConnection(conn);

         if (currentDateTimeFunction == null) {

             currentDateTimeFunction = findCurrentDateTimeFunction();

         }

     }

     /**

      * Always returns null or DATABASECHANGELOG table may not be found.

      */

     @Override

     public String getDefaultCatalogName() throws DatabaseException {

         return null;

     }

     /**

      * Always returns null or DATABASECHANGELOG table may not be found.

      */

     @Override

     protected String getDefaultDatabaseSchemaName() throws DatabaseException {

         return null;

     }

     public boolean isCorrectDatabaseImplementation(DatabaseConnection conn) throws DatabaseException {

         return false;

     }

     public String getDefaultDriver(String url) {

         return null;

     }

     public String getTypeName() {

         return "unsupported";

     }

     public boolean supportsInitiallyDeferrableColumns() {

         return false;

     }

     public String getCurrentDateTimeFunction() {

         return currentDateTimeFunction;

     }

     private String findCurrentDateTimeFunction() {

         // todo: reintroduce try {

         // String nowFunction = null;

         // String dateFunction = null;

         // String dateTimeFunction = null;

         // String timeStampFunction = null;

         //

         // String[] timeDateFunctions = getConnection().getMetaData().getTimeDateFunctions().split(",");

         // for (String functionName : timeDateFunctions) {

         // String function = functionName.trim().toUpperCase();

         // if (function.endsWith("TIMESTAMP")) {

         // timeStampFunction = functionName.trim();

         // }

         // if (function.endsWith("DATETIME")) {

         // dateTimeFunction = functionName.trim();

         // }

         // if (function.endsWith("DATE")) {

         // dateFunction = functionName.trim();

         // }

         // if ("NOW".equals(function)) {

         // nowFunction = functionName.trim();

         // }

         // }

         //

         // if (nowFunction != null) {

         // return "{fn "+nowFunction+"()"+"}";

         // } else if (timeStampFunction != null) {

         // return "{fn "+timeStampFunction+"()"+"}";

         // } else if (dateTimeFunction != null) {

         // return "{fn "+dateTimeFunction+"()"+"}";

         // } else if (dateFunction != null) {

         // return "{fn "+dateFunction+"()"+"}";

         // } else {

         // return "CURRENT_TIMESTAMP";

         // }

         //

         // } catch (SQLException e) {

         // throw new RuntimeException(e);

         // }

         return "CURRENT_TIMESTAMP";

     }

     // todo: reintroduce? @Override

     // protected boolean canCreateChangeLogTable() throws DatabaseException {

     // //check index size. Many drivers just return 0, so it's not a great test

     // int maxIndexLength;

     // try {

     // maxIndexLength = getConnection().getMetaData().getMaxIndexLength();

     //

     // return maxIndexLength == 0

     // || maxIndexLength >= 150 + 150 + 255 //id + author + filename length

     // && super.canCreateChangeLogTable();

     // } catch (SQLException e) {

     // throw new DatabaseException(e);

     // }

     // }

     public boolean supportsTablespaces() {

         return false;

     }

 }