Module org.apache.wicket.core

Package org.apache.wicket.markup.head

Class ResourceAggregator

java.lang.Object

org.apache.wicket.markup.html.DecoratingHeaderResponse

org.apache.wicket.markup.head.ResourceAggregator

All Implemented Interfaces:

Closeable, AutoCloseable, IHeaderResponse

public class ResourceAggregator
extends DecoratingHeaderResponse

ResourceAggregator implements resource dependencies, resource bundles and sorting of resources. During the rendering of components, all HeaderItems are recorded and processed at the end.

Author:

papegaaij

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ResourceAggregator.RecordedHeaderItem	Contains information about an HeaderItem that must be rendered.
static class	ResourceAggregator.RecordedHeaderItemLocation	The location in which a HeaderItem is added, consisting of the component/behavior that added the item, the index in the list for that component/behavior at which the item was added and the index in the request.

Constructor Summary

Constructors

Constructor	Description
ResourceAggregator(IHeaderResponse real)	Construct.

Method Summary

Modifier and Type	Method	Description
void	close()	Mark Header rendering is completed and subsequent usage will be ignored.
void	markRendered(Object object)	Overridden to keep track of the currently rendered component.
protected HeaderItem	preserveCssDetails(CssReferenceHeaderItem item, CssReferenceHeaderItem bundle)	Preserves the resource reference details for CSS resource replacements.
protected HeaderItem	preserveDetails(HeaderItem item, HeaderItem bundle)	Preserves the resource reference details for resource replacements.
void	render(HeaderItem item)	Renders the given HeaderItem to the response if none of its tokens has been rendered before.
boolean	wasRendered(Object object)	Overridden to keep track of the currently rendered component.

Methods inherited from class org.apache.wicket.markup.html.DecoratingHeaderResponse

getRealResponse, getResponse, isClosed

Methods inherited from class java.lang.Object

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

Constructor Details

ResourceAggregator

public ResourceAggregator(IHeaderResponse real)

Construct.

Parameters:

real -

Method Details

wasRendered

public boolean wasRendered(Object object)

Overridden to keep track of the currently rendered component.

Specified by:

wasRendered in interface IHeaderResponse

Overrides:

wasRendered in class DecoratingHeaderResponse

Parameters:

object - Object that is queried to be rendered

Returns:

Whether the object has been marked as rendered during the request

See Also:

• Component.internalRenderHead(org.apache.wicket.markup.html.internal.HtmlHeaderContainer)

markRendered

public void markRendered(Object object)

Overridden to keep track of the currently rendered component.

Specified by:

markRendered in interface IHeaderResponse

Overrides:

markRendered in class DecoratingHeaderResponse

Parameters:

object - object to be marked as rendered.

See Also:

• Component.internalRenderHead(org.apache.wicket.markup.html.internal.HtmlHeaderContainer)

render

public void render(HeaderItem item)

Description copied from interface: IHeaderResponse

Renders the given HeaderItem to the response if none of its tokens has been rendered before.

Automatically marks all item's tokens as rendered.

Specified by:

render in interface IHeaderResponse

Overrides:

render in class DecoratingHeaderResponse

Parameters:

item - The item to render.

See Also:

• IHeaderResponse.markRendered(Object)

close

public void close()

Description copied from interface: IHeaderResponse

Mark Header rendering is completed and subsequent usage will be ignored. If some kind of buffering is used internally, this action will mark that the contents has to be flushed out.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Specified by:

close in interface IHeaderResponse

Overrides:

close in class DecoratingHeaderResponse

preserveDetails

protected HeaderItem preserveDetails(HeaderItem item,
 HeaderItem bundle)

Preserves the resource reference details for resource replacements. For example if CSS resource with media screen is replaced with WebApplication.addResourceReplacement(org.apache.wicket.request.resource.CssResourceReference, org.apache.wicket.request.resource.ResourceReference) then the replacement will will inherit the media attribute

Parameters:

item - The replaced header item

bundle - The bundle that represents the replacement

Returns:

the bundle with the preserved details

preserveCssDetails

protected HeaderItem preserveCssDetails(CssReferenceHeaderItem item,
 CssReferenceHeaderItem bundle)

Preserves the resource reference details for CSS resource replacements. For example if CSS resource with media screen is replaced with WebApplication.addResourceReplacement(org.apache.wicket.request.resource.CssResourceReference, org.apache.wicket.request.resource.ResourceReference) then the replacement will will inherit the media attribute

Parameters:

item - The replaced header item

bundle - The bundle that represents the replacement

Returns:

the bundle with the preserved details