content: /*
   * Copyright (c) 2005, 2020, Oracle and/or its affiliates.
   *
   * This program is free software; you can redistribute it and/or modify it under
   * the terms of the GNU General Public License, version 2.0, as published by the
   * Free Software Foundation.
   *
   * This program is also distributed with certain software (including but not
   * limited to OpenSSL) that is licensed under separate terms, as designated in a
   * particular file or component or in included license documentation. The
   * authors of MySQL hereby grant you an additional permission to link the
   * program and your derivative works with the separately licensed software that
   * they have included with MySQL.
   *
   * Without limiting anything contained in the foregoing, this file, which is
   * part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
   * version 1.0, a copy of which can be found at
   * http://oss.oracle.com/licenses/universal-foss-exception.
   *
   * This program 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 General Public License, version 2.0,
   * for more details.
   *
   * You should have received a copy of the GNU General Public License along with
   * this program; if not, write to the Free Software Foundation, Inc.,
   * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
   */
  
  package com.mysql.cj.jdbc;
  
  import java.sql.ParameterMetaData;
  import java.sql.SQLException;
  
  import com.mysql.cj.Messages;
  import com.mysql.cj.MysqlType;
  import com.mysql.cj.Session;
  import com.mysql.cj.exceptions.ExceptionInterceptor;
  import com.mysql.cj.exceptions.MysqlErrorNumbers;
  import com.mysql.cj.jdbc.exceptions.SQLError;
  import com.mysql.cj.jdbc.result.ResultSetMetaData;
  import com.mysql.cj.result.Field;
  
  public class MysqlParameterMetadata implements ParameterMetaData {
      boolean returnSimpleMetadata = false;
  
      ResultSetMetaData metadata = null;
  
      int parameterCount = 0;
  
      private ExceptionInterceptor exceptionInterceptor;
  
      public MysqlParameterMetadata(Session session, Field[] fieldInfo, int parameterCount, ExceptionInterceptor exceptionInterceptor) {
          this.metadata = new ResultSetMetaData(session, fieldInfo, false, true, exceptionInterceptor);
  
          this.parameterCount = parameterCount;
          this.exceptionInterceptor = exceptionInterceptor;
      }
  
      /**
       * Used for "fake" basic metadata for client-side prepared statements when
       * we don't know the parameter types.
       * 
       * @param count
       *            parameters number
       */
      MysqlParameterMetadata(int count) {
          this.parameterCount = count;
          this.returnSimpleMetadata = true;
      }
  
      @Override
      public int getParameterCount() throws SQLException {
          return this.parameterCount;
      }
  
      @Override
      public int isNullable(int arg0) throws SQLException {
          checkAvailable();
  
          return this.metadata.isNullable(arg0);
      }
  
      private void checkAvailable() throws SQLException {
          if (this.metadata == null || this.metadata.getFields() == null) {
              throw SQLError.createSQLException(Messages.getString("MysqlParameterMetadata.0"), MysqlErrorNumbers.SQL_STATE_DRIVER_NOT_CAPABLE,
                      this.exceptionInterceptor);
          }
      }
  
      @Override
      public boolean isSigned(int arg0) throws SQLException {
          if (this.returnSimpleMetadata) {
              checkBounds(arg0);
  
              return false;
          }
  
          checkAvailable();
  
          return (this.metadata.isSigned(arg0));
      }
  
      @Override
      public int getPrecision(int arg0) throws SQLException {
          if (this.returnSimpleMetadata) {
              checkBounds(arg0);
  
              return 0;
          }
  
          checkAvailable();
  
          return (this.metadata.getPrecision(arg0));
      }
  
      @Override
      public int getScale(int arg0) throws SQLException {
          if (this.returnSimpleMetadata) {
              checkBounds(arg0);
  
              return 0;
          }
  
          checkAvailable();
  
          return (this.metadata.getScale(arg0));
      }
  
      @Override
      public int getParameterType(int arg0) throws SQLException {
          if (this.returnSimpleMetadata) {
              checkBounds(arg0);
  
              return MysqlType.VARCHAR.getJdbcType();
          }
  
          checkAvailable();
  
          return (this.metadata.getColumnType(arg0));
      }
  
      @Override
      public String getParameterTypeName(int arg0) throws SQLException {
          if (this.returnSimpleMetadata) {
              checkBounds(arg0);
  
              return MysqlType.VARCHAR.getName();
          }
  
          checkAvailable();
  
          return (this.metadata.getColumnTypeName(arg0));
      }
  
      @Override
      public String getParameterClassName(int arg0) throws SQLException {
          if (this.returnSimpleMetadata) {
              checkBounds(arg0);
  
              return "java.lang.String";
          }
  
          checkAvailable();
  
          return (this.metadata.getColumnClassName(arg0));
      }
  
      @Override
      public int getParameterMode(int arg0) throws SQLException {
          return parameterModeIn;
      }
  
      private void checkBounds(int paramNumber) throws SQLException {
          if (paramNumber < 1) {
              throw SQLError.createSQLException(Messages.getString("MysqlParameterMetadata.1", new Object[] { paramNumber }),
                      MysqlErrorNumbers.SQL_STATE_ILLEGAL_ARGUMENT, this.exceptionInterceptor);
          }
  
          if (paramNumber > this.parameterCount) {
              throw SQLError.createSQLException(Messages.getString("MysqlParameterMetadata.2", new Object[] { paramNumber, this.parameterCount }),
                      MysqlErrorNumbers.SQL_STATE_ILLEGAL_ARGUMENT, this.exceptionInterceptor);
  
          }
      }
  
      @Override
      public boolean isWrapperFor(Class<?> iface) throws SQLException {
          // This works for classes that aren't actually wrapping anything
          return iface.isInstance(this);
      }
  
      @Override
      public <T> T unwrap(Class<T> iface) throws SQLException {
          try {
              // This works for classes that aren't actually wrapping anything
              return iface.cast(this);
          } catch (ClassCastException cce) {
              throw SQLError.createSQLException(Messages.getString("Common.UnableToUnwrap", new Object[] { iface.toString() }),
                      MysqlErrorNumbers.SQL_STATE_ILLEGAL_ARGUMENT, this.exceptionInterceptor);
          }
      }
  }
  