/*
* 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.jstl.el;
import com.caucho.jsp.PageContextImpl;
import com.caucho.jstl.ChooseTag;
import com.caucho.util.L10N;
import com.caucho.xpath.Env;
import com.caucho.xpath.Expr;
import com.caucho.xpath.XPath;
import org.w3c.dom.Node;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.Tag;
import javax.servlet.jsp.tagext.TagSupport;
/**
* Tag representing an "when" condition.
*/
public class XmlWhenTag extends TagSupport {
private static L10N L = new L10N(XmlWhenTag.class);
private Expr _select;
/**
* Sets the select expression.
*
* @param select the select expression.
*/
public void setSelect(Expr select)
{
_select = select;
}
/**
* Process the tag.
*/
public int doStartTag()
throws JspException
{
try {
Tag parent = getParent();
if (! (parent instanceof ChooseTag))
throw new JspException(L.l("x:when tag must be contained in a c:choose tag."));
ChooseTag chooseTag = (ChooseTag) parent;
if (chooseTag.isMatch())
return SKIP_BODY;
PageContextImpl pageContext = (PageContextImpl) this.pageContext;
Env env = XPath.createEnv();
env.setVarEnv(pageContext.getVarEnv());
Node node = pageContext.getNodeEnv();
boolean test = _select.evalBoolean(node, env);
env.free();
if (test) {
chooseTag.setMatch();
return EVAL_BODY_INCLUDE;
}
else
return SKIP_BODY;
} catch (JspException e) {
throw e;
} catch (Exception e) {
throw new JspException(e);
}
}
}