org.apache.struts2.dispatcher
Class VelocityResult

java.lang.Object
  org.apache.struts2.dispatcher.StrutsResultSupport
      org.apache.struts2.dispatcher.VelocityResult

All Implemented Interfaces:

Result, Serializable, StrutsStatics

public class VelocityResult
extends StrutsResultSupport

Using the Servlet container's JspFactory, this result mocks a JSP execution environment and then displays a Velocity template that will be streamed directly to the servlet output.

This result type takes the following parameters:

• location (default) - the location of the template to process.
• parse - true by default. If set to false, the location param will not be parsed for Ognl expressions.

This result follows the same rules from StrutsResultSupport.

Example:

 <result name="success" type="velocity">
   <param name="location">foo.vm</param>
 </result>
 

See Also:

Serialized Form

Field Summary

private String	defaultEncoding
private static Logger	LOG
private static long	serialVersionUID
private VelocityManager	velocityManager

Fields inherited from class org.apache.struts2.dispatcher.StrutsResultSupport

DEFAULT_PARAM

Fields inherited from interface org.apache.struts2.StrutsStatics

HTTP_REQUEST, HTTP_RESPONSE, PAGE_CONTEXT, SERVLET_CONTEXT, SERVLET_DISPATCHER, STRUTS_PORTLET_CONTEXT

Constructor Summary

VelocityResult()

VelocityResult(String location)

Method Summary

protected org.apache.velocity.context.Context	createContext(VelocityManager velocityManager, ValueStack stack, HttpServletRequest request, HttpServletResponse response, String location) Creates the VelocityContext that we'll use to render this page.
void	doExecute(String finalLocation, ActionInvocation invocation) Creates a Velocity context from the action, loads a Velocity template and executes the template.
protected String	getContentType(String templateLocation) Retrieve the content type for this template.
protected String	getEncoding(String templateLocation) Retrieve the encoding for this template.
protected org.apache.velocity.Template	getTemplate(ValueStack stack, org.apache.velocity.app.VelocityEngine velocity, ActionInvocation invocation, String location, String encoding) Given a value stack, a Velocity engine, and an action invocation, this method returns the appropriate Velocity template to render.
void	setDefaultEncoding(String val)
void	setVelocityManager(VelocityManager mgr)

Methods inherited from class org.apache.struts2.dispatcher.StrutsResultSupport

conditionalParse, execute, getLastFinalLocation, getLocation, setEncode, setLocation, setParse

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

LOG

private static final Logger LOG

defaultEncoding

private String defaultEncoding

velocityManager

private VelocityManager velocityManager

Constructor Detail

VelocityResult

public VelocityResult()

VelocityResult

public VelocityResult(String location)

Method Detail

setDefaultEncoding

public void setDefaultEncoding(String val)

setVelocityManager

public void setVelocityManager(VelocityManager mgr)

doExecute

public void doExecute(String finalLocation,
                      ActionInvocation invocation)
               throws Exception

Creates a Velocity context from the action, loads a Velocity template and executes the template. Output is written to the servlet output stream.

Specified by:

doExecute in class StrutsResultSupport

Parameters:

finalLocation - the location of the Velocity template

invocation - an encapsulation of the action execution state.

Throws:

Exception - if an error occurs when creating the Velocity context, loading or executing the template or writing output to the servlet response stream.

getContentType

protected String getContentType(String templateLocation)

Retrieve the content type for this template.

People can override this method if they want to provide specific content types for specific templates (eg text/xml).

Returns:

The content type associated with this template (default "text/html")

getEncoding

protected String getEncoding(String templateLocation)

Retrieve the encoding for this template.

People can override this method if they want to provide specific encodings for specific templates.

Returns:

The encoding associated with this template (defaults to the value of 'struts.i18n.encoding' property)

getTemplate

protected org.apache.velocity.Template getTemplate(ValueStack stack,
                                                   org.apache.velocity.app.VelocityEngine velocity,
                                                   ActionInvocation invocation,
                                                   String location,
                                                   String encoding)
                                            throws Exception

Given a value stack, a Velocity engine, and an action invocation, this method returns the appropriate Velocity template to render.

Parameters:

stack - the value stack to resolve the location again (when parse equals true)

velocity - the velocity engine to process the request against

invocation - an encapsulation of the action execution state.

location - the location of the template

encoding - the charset encoding of the template

Returns:

the template to render

Throws:

Exception - when the requested template could not be found

createContext

protected org.apache.velocity.context.Context createContext(VelocityManager velocityManager,
                                                            ValueStack stack,
                                                            HttpServletRequest request,
                                                            HttpServletResponse response,
                                                            String location)

Creates the VelocityContext that we'll use to render this page.

Parameters:

velocityManager - a reference to the velocityManager to use

stack - the value stack to resolve the location against (when parse equals true)

location - the name of the template that is being used

Returns:

the a minted Velocity context.