java.lang.Object
- org.apache.wicket.markup.html.DecoratingHeaderResponse
- - org.apache.wicket.markup.head.filter.FilteringHeaderResponse

All Implemented Interfaces:

Closeable, AutoCloseable, IHeaderResponse

Direct Known Subclasses:

JavaScriptFilteredIntoFooterHeaderResponse
```
public class FilteringHeaderResponse
extends DecoratingHeaderResponse
```
This header response allows you to separate things that are added to the IHeaderResponse into different buckets. Then, you can render those different buckets in separate areas of the page based on your filter logic. A typical use case for this header response is to move the loading of JavaScript files (and inline script tags) to the footer of the page.

Author:

Jeremy Thomerson, Emond Papegaaij

See Also:

HeaderResponseContainer, CssAcceptingHeaderResponseFilter, JavaScriptAcceptingHeaderResponseFilter

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`static interface`	`FilteringHeaderResponse.IHeaderResponseFilter`	A filter used to bucket your resources, inline scripts, etc, into different responses.

Field Summary

Fields
Modifier and Type	Field	Description
`static String`	`DEFAULT_HEADER_FILTER_NAME`	The default name of the filter that will collect contributions which should be rendered in the page's <head>

Constructor Summary

Constructors
Constructor	Description
`FilteringHeaderResponse(IHeaderResponse response)`	Constructor without explicit filters.
`FilteringHeaderResponse(IHeaderResponse response, String headerFilterName, Iterable<? extends FilteringHeaderResponse.IHeaderResponseFilter> filters)`	Construct.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`close()`	Mark Header rendering is completed and subsequent usage will be ignored.
`protected IHeaderResponse`	`decorate(IHeaderResponse response)`	Decorate the given response used to get contents.
`static FilteringHeaderResponse`	`get()`
`CharSequence`	`getContent(String filterName)`	Gets the content that was rendered to this header response and matched the filter with the given name.
`void`	`render(HeaderItem item)`	Renders the given `HeaderItem` to the response if none of its tokens has been rendered before.
`protected void`	`render(HeaderItem item, List<HeaderItem> filteredItems)`
`protected void`	`setFilters(Iterable<? extends FilteringHeaderResponse.IHeaderResponseFilter> filters)`

Methods inherited from class org.apache.wicket.markup.html.DecoratingHeaderResponse
getRealResponse, getResponse, isClosed, markRendered, wasRendered

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - DEFAULT_HEADER_FILTER_NAME
```
public static final String DEFAULT_HEADER_FILTER_NAME
```
    The default name of the filter that will collect contributions which should be rendered in the page's <head>
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - FilteringHeaderResponse
```
public FilteringHeaderResponse(IHeaderResponse response)
```
    Constructor without explicit filters. Generates filters automatically for any FilteredHeaderItem. Any other contribution is rendered in the page's <head>
    
    Parameters:
    
    response - the wrapped IHeaderResponse
    
    See Also:
    
    HeaderResponseContainer
  - FilteringHeaderResponse
```
public FilteringHeaderResponse(IHeaderResponse response,
                               String headerFilterName,
                               Iterable<? extends FilteringHeaderResponse.IHeaderResponseFilter> filters)
```
    Construct.
    
    Parameters:
    
    response - the wrapped IHeaderResponse
    
    headerFilterName - the name that the filter for things that should appear in the head (default Wicket location) uses
    
    filters - the filters to use to bucket things. There will be a bucket created for each filter, by name. There should typically be at least one filter with the same name as your headerFilterName
- Method Detail
  - setFilters
```
protected void setFilters(Iterable<? extends FilteringHeaderResponse.IHeaderResponseFilter> filters)
```
  - get
```
public static FilteringHeaderResponse get()
```
    Returns:
    
    the FilteringHeaderResponse being used in this RequestCycle
  - 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
  - getContent
```
public final CharSequence getContent(String filterName)
```
    Gets the content that was rendered to this header response and matched the filter with the given name.
    
    Parameters:
    
    filterName - the name of the filter to get the bucket for
    
    Returns:
    
    the content that was accepted by the filter with this name
  - decorate
```
protected IHeaderResponse decorate(IHeaderResponse response)
```
    Decorate the given response used to get contents.
    
    Parameters:
    
    response - response to decorate
    
    Returns:
    
    default implementation just returns the response
  - render
```
protected void render(HeaderItem item,
                      List<HeaderItem> filteredItems)
```

Class FilteringHeaderResponse

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

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

Methods inherited from class java.lang.Object

Field Detail

DEFAULT_HEADER_FILTER_NAME

Constructor Detail

FilteringHeaderResponse

FilteringHeaderResponse

Method Detail

setFilters

get

render

close

getContent

decorate

render