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'jdbacl' stands for 'Java DataBase ACcess Layer' and provides utilities for accessing JDBC databases from Java programs, retrieving meta information in an object model and querying database data. 'rapiddweller jdbacl' is forked from Databene jdbacl by Volker Bergmann.

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/*
 * (c) Copyright 2010-2012 by Volker Bergmann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, is permitted under the terms of the
 * GNU General Public License (GPL).
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * WITHOUT A WARRANTY OF ANY KIND. ALL EXPRESS OR IMPLIED CONDITIONS,
 * REPRESENTATIONS AND WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE
 * HEREBY EXCLUDED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package com.rapiddweller.jdbacl.dialect;

import com.rapiddweller.common.StringUtil;
import com.rapiddweller.jdbacl.DatabaseDialect;
import com.rapiddweller.jdbacl.sql.Query;

import java.util.regex.Pattern;

/**
 * Implements generic database concepts for SQL Server.


 * Created: 09.04.2010 07:29:32
 *
 * @author Volker Bergmann
 * @since 0.6.0
 */
public class SqlServerDialect extends DatabaseDialect {

  private static final String DATE_PATTERN = "''yyyy-MM-dd''";
  private static final String TIME_PATTERN = "''HH:mm:ss''";
  private static final String DATETIME_PATTERN = "''yyyy-MM-dd'T'HH:mm:ss''";

  /**
   * The Random name pattern.
   */
  final Pattern randomNamePattern = Pattern.compile("SYS_\\w*");

  /**
   * Instantiates a new Sql server dialect.
   */
  public SqlServerDialect() {
    super("sql_server", true, false, DATE_PATTERN, TIME_PATTERN, DATETIME_PATTERN);
  }

  @Override
  public boolean isDefaultCatalog(String catalog, String user) {
    return true;
  }

  @Override
  public boolean isDefaultSchema(String schema, String user) {
    return "DBO".equalsIgnoreCase(schema);
  }

  @Override
  public boolean isDeterministicPKName(String pkName) {
    return !randomNamePattern.matcher(pkName).matches();
  }

  @Override
  public boolean isDeterministicUKName(String pkName) {
    return !randomNamePattern.matcher(pkName).matches();
  }

  @Override
  public boolean isDeterministicFKName(String pkName) {
    return !randomNamePattern.matcher(pkName).matches();
  }

  @Override
  public boolean isDeterministicIndexName(String indexName) {
    return !randomNamePattern.matcher(indexName).matches();
  }

  @Override
  public String renderCase(String columnName, String elseExpression, String... whenThenExpressionPairs) {
    StringBuilder builder = new StringBuilder();
    builder.append(columnName).append(" = "); // applying column name
    builder.append("CASE");
    for (int i = 0; i < whenThenExpressionPairs.length; i += 2) {
      builder.append(" WHEN ").append(whenThenExpressionPairs[i]); // when part
      builder.append(" THEN ").append(whenThenExpressionPairs[i + 1]); // then part
    }
    if (!StringUtil.isEmpty(elseExpression)) {
      builder.append(" ELSE ").append(elseExpression); // else part
    }
    builder.append(" END"); // closing the case
    return builder.toString();
  }

  @Override
  public void restrictRownums(int firstRowIndex, int rowCount,
                              Query query) {
	    /* TODO v0.8.2 implement DatabaseDialect.applyRownumRestriction()
			MS SQL Server: SELECT TOP 10 * FROM T
	     */
    throw new UnsupportedOperationException("SqlServerDialect.applyRownumRestriction() is not implemented");
  }

}