/*
* $Header: /home/cvs/jakarta-struts/src/share/org/apache/struts/taglib/logic/ForwardTag.java,v 1.5 2001/02/12 21:49:55 craigmcc Exp $
* $Revision: 1.5 $
* $Date: 2001/02/12 21:49:55 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999-2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Struts", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.struts.taglib.logic;
import java.io.IOException;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.TagSupport;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionForwards;
import org.apache.struts.util.MessageResources;
import org.apache.struts.util.RequestUtils;
/**
* Perform a forward or redirect to a page that is looked up in the global
* ActionForwards collection associated with our application.
*
* @author Craig R. McClanahan
* @version $Revision: 1.5 $ $Date: 2001/02/12 21:49:55 $
*/
public class ForwardTag extends TagSupport {
// ----------------------------------------------------------- Properties
/**
* The message resources for this package.
*/
protected static MessageResources messages =
MessageResources.getMessageResources
("org.apache.struts.taglib.logic.LocalStrings");
/**
* The logical name of the <code>ActionForward</code> entry to be
* looked up.
*/
protected String name = null;
public String getName() {
return (this.name);
}
public void setName(String name) {
this.name = name;
}
// ------------------------------------------------------- Public Methods
/**
* Defer processing until the end of this tag is encountered.
*
* @exception JspException if a JSP exception has occurred
*/
public int doStartTag() throws JspException {
return (SKIP_BODY);
}
/**
* Look up the ActionForward associated with the specified name,
* and perform a forward or redirect to that path as indicated.
*
* @exception JspException if a JSP exception has occurred
*/
public int doEndTag() throws JspException {
// Look up the desired ActionForward entry
ActionForward forward = null;
ActionForwards forwards =
(ActionForwards) pageContext.getAttribute
(Action.FORWARDS_KEY, PageContext.APPLICATION_SCOPE);
if (forwards != null)
forward = forwards.findForward(name);
if (forward == null) {
JspException e = new JspException
(messages.getMessage("forward.lookup", name));
RequestUtils.saveException(pageContext, e);
throw e;
}
// Forward or redirect to the corresponding actual path
String path = forward.getPath();
if (forward.getRedirect()) {
HttpServletResponse response =
(HttpServletResponse) pageContext.getResponse();
try {
response.sendRedirect(response.encodeRedirectURL(path));
} catch (Exception e) {
RequestUtils.saveException(pageContext, e);
throw new JspException
(messages.getMessage("forward.redirect",
name, e.toString()));
}
} else {
try {
pageContext.forward(path);
} catch (Exception e) {
RequestUtils.saveException(pageContext, e);
throw new JspException
(messages.getMessage("forward.forward",
name, e.toString()));
}
}
// Skip the remainder of this page
return (SKIP_PAGE);
}
/**
* Release all allocated resources.
*/
public void release() {
super.release();
name = null;
}
}