HeaderItem (Wicket Parent 9.18.0-SNAPSHOT API)

java.lang.Object
- org.apache.wicket.markup.head.HeaderItem

All Implemented Interfaces:

Serializable, IClusterable

Direct Known Subclasses:

AbstractCspHeaderItem, FilteredHeaderItem, MetaDataHeaderItem, NoHeaderItem, PriorityHeaderItem, PushHeaderItem, StringHeaderItem
```
public abstract class HeaderItem
extends Object
implements IClusterable
```
HeaderItem represents anything that can be rendered into the header. This can, for example, be a script or a stylesheet , but also event triggers or free form text. HeaderItems are used by ResourceAggregator to be able to collect all header sections in a uniform way. All HeaderItems are expected to have decent equals, hashCode and toString (for debugging).

Author:

papegaaij

See Also:

Serialized Form

Constructor Summary

Constructors
Constructor Description

HeaderItem()

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`List<HeaderItem>`	`getDependencies()`
`Iterable<? extends HeaderItem>`	`getProvidedResources()`
`abstract Iterable<?>`	`getRenderTokens()`
`abstract void`	`render(Response response)`	Renders the `HeaderItem` to the response.

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

- Constructor Detail
  - HeaderItem
```
public HeaderItem()
```
- Method Detail
  - getDependencies
```
public List<HeaderItem> getDependencies()
```
    Returns:
    
    The dependencies this HeaderItem has. Dependencies will always be rendered before the item itself.
  - getProvidedResources
```
public Iterable<? extends HeaderItem> getProvidedResources()
```
    Returns:
    
    The resources this HeaderItem provides. As these resources are provided by this item, they will no longer be rendered.
  - getRenderTokens
```
public abstract Iterable<?> getRenderTokens()
```
    Returns:
    
    The tokens this HeaderItem can be identified by. If any of the tokens has already been rendered, this HeaderItem will not be rendered.
  - render
```
public abstract void render(Response response)
```
    Renders the HeaderItem to the response.
    
    Parameters:
    
    response -