package org.apache.turbine.modules.screens;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 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 acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache Turbine" 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",
* "Apache Turbine", nor may "Apache" appear in their name, without
* prior written permission of the Apache Software Foundation.
*
* 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/>.
*/
// Turbine/Village/ECS Imports
import org.apache.ecs.ConcreteElement;
import org.apache.ecs.StringElement;
import org.apache.turbine.services.freemarker.FreeMarkerService;
import org.apache.turbine.services.TurbineServices;
import org.apache.turbine.services.template.TurbineTemplate;
import org.apache.turbine.util.RunData;
// FreeMarker Stuff
import freemarker.template.SimpleHash;
/**
* Sample FreeMarker Screen. Screens which use FreeMarker templates
* can extend this screen.
*
* For templates which require no database content, this screen may be
* adequate. In other cases, screens can override the
* doBuildFreeMarker method to add more data to the context.
*
* @author <a href="mailto:john.mcnally@clearink.com">John D. McNally</a>
* @version $Id$
*/
public class BaseFreeMarkerScreen extends TemplateScreen
{
/**
* Screens extending this class should overide this method to
* perform any particular business logic and add information to
* the context.
*
* @param data, the Rundata object
* @param context, the context into which the extra data is to be added.
* @exception Exception, a generic exception.
*/
protected void doBuildTemplate(RunData data, SimpleHash context)
throws Exception
{
}
/**
* Needs to be implemented to make TemplateScreen like us. The
* actual method that you should override is the one with the
* context in the parameter list.
*
* @param data, the Rundata object
* @exception Exception, a generic exception.
*/
protected void doBuildTemplate( RunData data )
throws Exception
{
doBuildTemplate( data, getContext(data) );
}
/**
* Return the model needed by FreeMarker. This is where
* information needed by the template should be placed.
*
* @param data, the Rundata object
* @return SimpleHash
*/
protected SimpleHash getContext(RunData data)
{
// Attempt to get it from the TemplateInfo first. If it
// doesn't exist, create it and then stuff it into the
// TemplateInfo.
SimpleHash context = (SimpleHash)data.getTemplateInfo()
.getTemplateContext(FreeMarkerService.CONTEXT);
if (context == null)
{
FreeMarkerService fm = (FreeMarkerService)TurbineServices
.getInstance().getService(FreeMarkerService.SERVICE_NAME);
context = fm.getContext();
data.getTemplateInfo()
.setTemplateContext(FreeMarkerService.CONTEXT, context);
}
return context;
}
/**
* Build the template.
*
* @param data Turbine information.
* @return A ConcreteElement.
* @exception Exception, a generic exception.
*/
public ConcreteElement buildTemplate(RunData data)
throws Exception
{
SimpleHash context = getContext(data);
String templateName = TurbineTemplate.getScreenTemplateName(
data.getTemplateInfo().getScreenTemplate() );
// Template service adds the leading slash, but make it sure.
if ((templateName.length() > 0) &&
(templateName.charAt(0) != '/'))
{
templateName = '/' + templateName;
}
FreeMarkerService fm = (FreeMarkerService)
TurbineServices.getInstance()
.getService(FreeMarkerService.SERVICE_NAME);
StringElement output = new StringElement();
output.setFilterState(false);
output.addElement(
fm.handleRequest(context, "screens" + templateName, true));
return output;
}
}