wicket
Class Resource

java.lang.Object
  wicket.Resource

All Implemented Interfaces:

IRequestListener, IResourceListener, java.io.Serializable

Direct Known Subclasses:

WebResource

public abstract class Resource

extends java.lang.Object

implements IResourceListener

A Resource is something that implements IResourceListener and provides a getResource() method which returns the raw IResource to be rendered back to the client browser.

Resources themselves do not currently have URLs. Instead, they are referred to by components that have URLs.

Resources can be shared throughout an application by adding them to Application with addResource(Class scope, String name) or addResource(String name). A resource added in such a way is a named resource and is accessible throughout the application via Application.getResource(Class scope, String name) or Application.getResource(String name). The ResourceReference class enables easy access to such resources in a way that is light on clusters.

While resources can be shared between components, it is important to emphasize that components cannot be shared among containers. For example, you can create a button image resource with new DefaultButtonImageResource(...) and store that in the Application with addResource(). You can then assign that logical resource via ResourceReference to several ImageButton components. While the button image resource can be shared between components like this, the ImageButton components in this example are like all other components in Wicket and cannot be shared.

Author:

Jonathan Locke

See Also:

Serialized Form

Field Summary

protected IResourceStream

resourceStream The actual raw resource this class is rendering

Constructor Summary

protected

Resource() Constructor

Method Summary

abstract IResourceStream	getResourceStream()
protected void	invalidate() Sets any loaded resource to null, thus forcing a reload on the next request.
boolean	isCacheable()
void	onResourceRequested() THIS METHOD IS NOT PART OF THE WICKET PUBLIC API.
void	setCacheable(boolean cacheable) Should this resource be cacheable, so will it set the last modified and the some cache headers in the response.

Methods inherited from class java.lang.Object

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

Field Detail

resourceStream

protected IResourceStream resourceStream

The actual raw resource this class is rendering

Constructor Detail

Resource

protected Resource()

Constructor

Method Detail

getResourceStream

public abstract IResourceStream getResourceStream()

Returns:

Gets the resource to render to the requester

isCacheable

public boolean isCacheable()

Returns:

boolean True or False if this resource is cacheable

onResourceRequested

public final void onResourceRequested()

THIS METHOD IS NOT PART OF THE WICKET PUBLIC API. DO NOT CALL IT. Called when a resource is requested.

Specified by:

onResourceRequested in interface IResourceListener

setCacheable

public final void setCacheable(boolean cacheable)

Should this resource be cacheable, so will it set the last modified and the some cache headers in the response.

Parameters:

cacheable - boolean if the lastmodified and cache headers must be set.

invalidate

protected void invalidate()

Sets any loaded resource to null, thus forcing a reload on the next request.