/*
* The Apache Software License, Version 1.1
*
* Copyright (c) 2003 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", "Velocity", 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.velocity.tools.struts;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import javax.servlet.ServletContext;
import org.apache.struts.util.MessageResources;
import org.apache.struts.action.*;
import org.apache.velocity.tools.view.context.ViewContext;
import org.apache.velocity.tools.view.tools.ViewTool;
/**
* <p>View tool to work with HTML forms in Struts.</p>
*
* <p>This class is equipped to be used with a toolbox manager, for example
* the ServletToolboxManager included with VelServlet. This class implements
* interface ViewTool, which allows a toolbox manager to pass the required
* context information.</p>
*
* <p>This class is not thread-safe by design. A new instance is needed for
* the processing of every template request. This means this tool should
* only be used in the request scope, not application or session scopes.</p>
*
* @author <a href="mailto:sidler@teamup.com">Gabe Sidler</a>
*
* @version $Id: FormTool.java,v 1.3 2003/05/28 00:17:15 nbubna Exp $
*/
public class FormTool implements ViewTool
{
// --------------------------------------------- Properties ---------------
/**
* A reference to the HtttpServletRequest.
*/
protected HttpServletRequest request;
/**
* A reference to the HtttpSession.
*/
protected HttpSession session;
// --------------------------------------------- Constructors -------------
/**
* Default constructor. Tool must be initialized before use.
*/
public FormTool()
{
}
/**
* Initializes this tool.
*
* @param obj the current ViewContext
* @throws IllegalArgumentException if the param is not a ViewContext
*/
public void init(Object obj)
{
if (!(obj instanceof ViewContext))
{
throw new IllegalArgumentException("Tool can only be initialized with a ViewContext");
}
ViewContext context = (ViewContext)obj;
this.request = context.getRequest();
this.session = request.getSession(false);
}
// --------------------------------------------- View Helpers -------------
/**
* <p>Returns the form bean associated with this action mapping.</p>
*
* <p>This is a convenience method. The form bean is automatically
* available in the Velocity context under the name defined in the
* Struts configuration.</p>
*
* <p>If the form bean is used repeatedly, it is recommended to create a
* local variable referencing the bean rather than calling getBean()
* multiple times.</p>
*
* <pre>
* Example:
* #set ($defaults = $form.bean)
* <input type="text" name="username" value="$defaults.username">
* </pre>
*
* @return the {@link ActionForm} associated with this request or
* <code>null</code> if there is no form bean associated with this mapping
*/
public ActionForm getBean()
{
return StrutsUtils.getActionForm(request, session);
}
/**
* <p>Returns the query parameter name under which a cancel button press
* must be reported if form validation is to be skipped.</p>
*
* <p>This is the value of
* <code>org.apache.struts.taglib.html.Constants.CANCEL_PROPERTY</code></p>
*/
public String getCancelName()
{
return StrutsUtils.getCancelName();
}
/**
* Returns the transaction control token for this session or
* <code>null</code> if no token exists.
*/
public String getToken()
{
return StrutsUtils.getToken(session);
}
/**
* <p>Returns the query parameter name under which a transaction token
* must be reported. This is the value of
* <code>org.apache.struts.taglib.html.Constants.TOKEN_KEY</code></p>
*/
public String getTokenName()
{
return StrutsUtils.getTokenName();
}
}