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/*
 * Copyright (c) 1998-2018 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;

final class LongLtExpr extends AbstractBinaryBooleanExpr {
  private final Expr _left;
  private final Expr _right;

  LongLtExpr(Expr left, Expr right)
  {
    _left = left;
    _right = right;
  }

  @Override
  public final Expr getLeft()
  {
    return _left;
  }

  @Override
  public final Expr getRight()
  {
    return _right;
  }

  @Override
  public Expr create(Expr left, Expr right)
  {
    return new LongLtExpr(left, right);
  }

  /**
   * True if the current row matches this expression.
   */
  @Override
  public final boolean isSelect(final QueryContext context)
    throws SQLException
  {
    final Expr left = _left;
    final Expr right = _right;
    
    if (left.isNull(context) || right.isNull(context))
      return false;

    return (left.evalLong(context) < right.evalLong(context));
  }

  @Override
  public final int evalBoolean(final QueryContext context)
    throws SQLException
  {
    final Expr left = _left;
    final Expr right = _right;
    
    if (left.isNull(context) || right.isNull(context))
      return UNKNOWN;

    if (left.evalLong(context) < right.evalLong(context))
      return TRUE;
    else
      return FALSE;
  }

  @Override
  public String toString()
  {
    return "(" + _left + " < " + _right + ")";
  }
}