/*
* 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 javax.servlet.jsp.tagext;
import javax.servlet.jsp.JspContext;
import javax.servlet.jsp.JspException;
import java.io.IOException;
/**
* Support for SimpleTag.
*/
public class SimpleTagSupport implements SimpleTag {
private JspTag _parent;
private JspFragment _jspBody;
private JspContext _jspContext;
/**
* Create a new SimpleTagSupport.
*/
public SimpleTagSupport()
{
}
/**
* returns the parent
*/
public JspTag getParent()
{
return _parent;
}
/**
* Sets the parent
*/
public void setParent(JspTag parent)
{
_parent = parent;
}
/**
* returns the body fragment.
*/
protected JspFragment getJspBody()
{
return _jspBody;
}
/**
* Sets the body fragment.
*/
public void setJspBody(JspFragment body)
{
_jspBody = body;
}
/**
* returns the context
*/
protected JspContext getJspContext()
{
return _jspContext;
}
/**
* Sets the context
*/
public void setJspContext(JspContext context)
{
_jspContext = context;
}
/**
* Does nothing.
*/
public void doTag()
throws IOException, JspException
{
}
/**
* Finds an ancestor of a tag matching the class. The search is strict,
* i.e. only parents will be searched, not the tag itself.
*
* @param tag child tag to start searching.
* @param cl the class that the tag should implement.
*
* @return the matching tag or null.
*/
public static final JspTag findAncestorWithClass(JspTag tag, Class<?> cl)
{
if (tag == null || cl == null)
return null;
while (tag != null) {
if (tag instanceof Tag)
tag = ((Tag) tag).getParent();
else if (tag instanceof SimpleTag)
tag = ((SimpleTag) tag).getParent();
if (tag == null)
return null;
else if (tag instanceof TagAdapter) {
TagAdapter adapter = (TagAdapter) tag;
if (cl.isAssignableFrom(adapter.getAdaptee().getClass()))
return adapter.getAdaptee();
}
else if (cl.isAssignableFrom(tag.getClass()))
return tag;
}
return null;
}
}