/*
* 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 SoftwareFoundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.db.fun;
import com.caucho.db.sql.Expr;
import com.caucho.db.sql.FromItem;
import com.caucho.db.sql.Query;
import com.caucho.db.sql.FunExpr;
import com.caucho.db.sql.QueryContext;
import com.caucho.util.Alarm;
import com.caucho.util.L10N;
import com.caucho.util.QDate;
import java.sql.SQLException;
import java.util.Date;
import java.util.ArrayList;
public class BitandExpr extends FunExpr {
protected static final L10N L = new L10N(BitandExpr.class);
private Expr _left;
private Expr _right;
public BitandExpr()
{
}
public BitandExpr(Expr left, Expr right)
{
_left = left;
_right = right;
}
protected void addArg(Expr expr)
throws SQLException
{
if (_left == null)
_left = expr;
else if (_right == null)
_right = expr;
else
throw new SQLException(L.l("bitand() has too many arguments"));
}
/**
* Returns the expected result type of the expression.
*/
public Class getType()
{
return long.class;
}
/**
* Binds the expression to the actual tables.
*/
public Expr bind(Query query)
throws SQLException
{
Expr newLeft = _left.bind(query);
Expr newRight = _right.bind(query);
return new BitandExpr(newLeft, newRight);
}
/**
* Returns the cost based on the given FromList.
*/
public long subCost(ArrayList<FromItem> fromList)
{
return _left.subCost(fromList) + _right.subCost(fromList);
}
/**
* Returns true for a null value.
*
* @param rows the current tuple being evaluated
*
* @return true if null
*/
public boolean isNull(QueryContext context)
throws SQLException
{
return false;
}
/**
* Evaluates the expression as a double.
*
* @param rows the current tuple being evaluated
*
* @return the double value
*/
public double evalDouble(QueryContext context)
throws SQLException
{
return evalLong(context);
}
/**
* Evaluates the expression as a long.
*
* @param rows the current tuple being evaluated
*
* @return the long value
*/
public long evalLong(QueryContext context)
throws SQLException
{
return _left.evalLong(context) & _right.evalLong(context);
}
/**
* Evaluates the expression as a string.
*
* @param rows the current tuple being evaluated
*
* @return the string value
*/
public String evalString(QueryContext context)
throws SQLException
{
return String.valueOf(evalLong(context));
}
public String toString()
{
return "bitand(" + _left + ", " + _right + ")";
}
}