Package javax.servlet.jsp.tagext
Class TagAdapter
- java.lang.Object
- 
- javax.servlet.jsp.tagext.TagAdapter
 
- 
 public class TagAdapter extends java.lang.Object implements Tag Wraps any SimpleTag and exposes it using a Tag interface. This is used to allow collaboration between classic Tag handlers and SimpleTag handlers.Because SimpleTag does not extend Tag, and because Tag.setParent() only accepts a Tag instance, a classic tag handler (one that implements Tag) cannot have a SimpleTag as its parent. To remedy this, a TagAdapter is created to wrap the SimpleTag parent, and the adapter is passed to setParent() instead. A classic Tag Handler can call getAdaptee() to retrieve the encapsulated SimpleTag instance. - Since:
- JSP 2.0
 
- 
- 
Field Summary- 
Fields inherited from interface javax.servlet.jsp.tagext.TagEVAL_BODY_INCLUDE, EVAL_PAGE, SKIP_BODY, SKIP_PAGE
 
- 
 - 
Constructor SummaryConstructors Constructor Description TagAdapter(SimpleTag adaptee)Creates a new TagAdapter that wraps the given SimpleTag and returns the parent tag when getParent() is called.
 - 
Method SummaryAll Methods Instance Methods Concrete Methods Modifier and Type Method Description intdoEndTag()Must not be called.intdoStartTag()Must not be called.JspTaggetAdaptee()Gets the tag that is being adapted to the Tag interface.TaggetParent()Returns the parent of this tag, which is always getAdaptee().getParent().voidrelease()Must not be called.voidsetPageContext(PageContext pc)Must not be called.voidsetParent(Tag parentTag)Must not be called.
 
- 
- 
- 
Constructor Detail- 
TagAdapterpublic TagAdapter(SimpleTag adaptee) Creates a new TagAdapter that wraps the given SimpleTag and returns the parent tag when getParent() is called.- Parameters:
- adaptee- The SimpleTag being adapted as a Tag.
 
 
- 
 - 
Method Detail- 
setPageContextpublic void setPageContext(PageContext pc) Must not be called.- Specified by:
- setPageContextin interface- Tag
- Parameters:
- pc- ignored.
- Throws:
- java.lang.UnsupportedOperationException- Must not be called
 
 - 
setParentpublic void setParent(Tag parentTag) Must not be called. The parent of this tag is always getAdaptee().getParent().
 - 
getParentpublic Tag getParent() Returns the parent of this tag, which is always getAdaptee().getParent(). This will either be the enclosing Tag (if getAdaptee().getParent() implements Tag), or an adapter to the enclosing Tag (if getAdaptee().getParent() does not implement Tag).- Specified by:
- getParentin interface- Tag
- Returns:
- The parent of the tag being adapted.
- See Also:
- TagSupport.findAncestorWithClass(javax.servlet.jsp.tagext.Tag, java.lang.Class)
 
 - 
getAdapteepublic JspTag getAdaptee() Gets the tag that is being adapted to the Tag interface. This should be an instance of SimpleTag in JSP 2.0, but room is left for other kinds of tags in future spec versions.- Returns:
- the tag that is being adapted
 
 - 
doStartTagpublic int doStartTag() throws JspExceptionMust not be called.- Specified by:
- doStartTagin interface- Tag
- Returns:
- always throws UnsupportedOperationException
- Throws:
- java.lang.UnsupportedOperationException- Must not be called
- JspException- never thrown
- See Also:
- BodyTag
 
 - 
doEndTagpublic int doEndTag() throws JspExceptionMust not be called.- Specified by:
- doEndTagin interface- Tag
- Returns:
- always throws UnsupportedOperationException
- Throws:
- java.lang.UnsupportedOperationException- Must not be called
- JspException- never thrown
 
 
- 
 
-