/*
* 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.servlets.ssi;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Represents a SSI string concat expression
*/
public class ConcatExpr extends SSIExpr {
private final SSIExpr _left;
private final SSIExpr _right;
private ConcatExpr(SSIExpr left, SSIExpr right)
{
_left = left;
_right = right;
}
static SSIExpr create(SSIExpr left, SSIExpr right)
{
if (left == null)
return right;
else if (right == null)
return left;
else
return new ConcatExpr(left, right);
}
/**
* Evaluate as a string.
*/
public String evalString(HttpServletRequest request,
HttpServletResponse response)
{
return (_left.evalString(request, response) +
_right.evalString(request, response));
}
}