/*
 * Copyright 2012 Alex Telepov.
 * Copyright 2012 James Moger.
 *
 * 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.iciql;

/**
 * MS SQL Server database dialect.
 */
public class SQLDialectMSSQL extends SQLDialectDefault {

  /**
   * Append limit and offset rows
   *
   * @param stat Statement
   * @param limit Limit rows
   * @param offset Offset rows
   */
  @Override
  public void appendLimitOffset(SQLStatement stat, long limit, long offset) {
	  if (offset > 0) {
		  throw new IciqlException("iciql does not support offset for MSSQL dialect!");
	  }
    StringBuilder query = new StringBuilder(stat.getSQL());

    // for databaseVersion >= 2012 need Offset
    if (limit > 0) {
      int indexSelect = query.indexOf("SELECT");

      if (indexSelect >= 0) {
        StringBuilder subPathQuery = new StringBuilder(" TOP ");
        subPathQuery.append(Long.toString(limit));

        query.insert(indexSelect + "SELECT".length(), subPathQuery);

        stat.setSQL(query.toString());
      }
    }
  }
}