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A reactive Java web server.
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/*
 * Copyright (c) 1998-2015 Caucho Technology -- all rights reserved
 *
 * This file is part of Baratine(TM)
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Baratine 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.
 *
 * Baratine 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 Baratine; 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.v5.kraken.query;

import java.io.InputStream;

import com.caucho.v5.kelp.RowCursor;
import com.caucho.v5.kelp.query.ExprBuilderKelp;

public class ParamExpr extends ExprKraken
{
  private final int _index;
  
  public ParamExpr(int index)
  {
    _index = index;
  }
  
  @Override
  public String evalString(Object []params)
  {
    return String.valueOf(params[_index]);
  }
  
  @Override
  public int evalInt(RowCursor cursor, Object []params)
  {
    return ((Number) params[_index]).intValue();
  }
  
  @Override
  public long evalLong(RowCursor cursor, Object []params)
  {
    return ((Number) params[_index]).longValue();
  }
  
  @Override
  public double evalDouble(Object []params)
  {
    return ((Number) params[_index]).doubleValue();
  }
  
  @Override
  public Object evalObject(RowCursor cursor, Object []params)
  {
    return params[_index];
  }
  
  @Override
  public byte []evalBytes(Object []params)
  {
    return (byte[]) params[_index];
  }
  
  @Override
  public InputStream evalInputStream(Object []params)
  {
    return ((InputStream) params[_index]);
  }
  
  //
  // build methods
  //
  
  /**
   * True if the expression is a constant for all rows, e.g. params.
   */
  @Override
  public boolean isConstant()
  {
    return true;
  }

  @Override
  public ExprBuilderKelp buildKelp(QueryBuilderKraken builder)
  {
    return builder.getBuilderKelp().param(_index);
  }
  
  @Override
  public String toObjectExpr(String columnName)
  {
    return "?";
  }

  @Override
  public String toString()
  {
    return getClass().getSimpleName() + "[" + _index + "]";
  }
}