AbstractBinaryBooleanExpr.java

/*
 * Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source 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, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.db.sql;

import java.sql.SQLException;

import com.caucho.db.table.Column.ColumnType;
import com.caucho.inject.Module;

@Module
abstract class AbstractBinaryBooleanExpr extends AbstractBinaryExpr {
  /**
   * Returns the type of the expression.
   */
  @Override
  public Class<?> getType()
  {
    return boolean.class;
  }

  @Override
  public String evalString(QueryContext context)
    throws SQLException
  {
    switch (evalBoolean(context)) {
    case TRUE:
      return "1";
    case FALSE:
      return "0";
    default:
      return null;
    }
  }
}