javax.faces.view.facelets

Class TagHandler

java.lang.Object

javax.faces.view.facelets.TagHandler

All Implemented Interfaces:

FaceletHandler

Direct Known Subclasses:

MetaTagHandler

public abstract class TagHandler
extends Object
implements FaceletHandler

Foundation class for FaceletHandlers associated with a markup element in a Facelet document. This class introduces the concept of XML attributes to Facelets. See the constructor documentation for more details.

Since:

2.0

Field Summary

Fields

Modifier and Type	Field and Description
protected FaceletHandler	nextHandler A reference to the FaceletHandler that represents the first nested child of this TagHandler instance.
protected Tag	tag A reference to the Tag instance corresponding to this TagHandler instance.
protected String	tagId See TagConfig.getTagId().

Constructor Summary

Constructors

Constructor and Description
TagHandler(TagConfig config) Every TagHandler instance is associated with a Tag.

Method Summary

Modifier and Type	Method and Description
protected TagAttribute	getAttribute(String localName) Utility method for fetching the appropriate TagAttribute
protected TagAttribute	getRequiredAttribute(String localName) Utility method for fetching a required TagAttribute
String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface javax.faces.view.facelets.FaceletHandler

apply

Field Detail

tagId

protected final String tagId

See TagConfig.getTagId().

tag

protected final Tag tag

A reference to the Tag instance corresponding to this TagHandler instance.

nextHandler

protected final FaceletHandler nextHandler

A reference to the FaceletHandler that represents the first nested child of this TagHandler instance.

Constructor Detail

TagHandler

public TagHandler(TagConfig config)

Every TagHandler instance is associated with a Tag. Each Tag instance has a TagAttributes property, which is simply a collection of TagAttribute instances. Extract and save as protected instance variables the TagConfig.getTagId(), TagConfig.getTag() and TagConfig.getNextHandler() returns from the argument TagConfig. This constructor is only called when the Facelets View is compiled.

Parameters:

config - The structure that contains useful to the operation of this instance.

Method Detail

getAttribute

protected final TagAttribute getAttribute(String localName)

Utility method for fetching the appropriate TagAttribute

Parameters:

localName - name of attribute

Returns:

TagAttribute if found, otherwise null

getRequiredAttribute

protected final TagAttribute getRequiredAttribute(String localName)
                                           throws TagException

Utility method for fetching a required TagAttribute

Parameters:

localName - name of the attribute

Returns:

TagAttribute if found, otherwise error

Throws:

TagException - if the attribute was not found

toString

public String toString()

Overrides:

toString in class Object