public class TagAdapter extends Object implements Tag
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.
EVAL_BODY_INCLUDE, EVAL_PAGE, SKIP_BODY, SKIP_PAGE| Constructor and Description |
|---|
TagAdapter(SimpleTag adaptee)
Creates a new TagAdapter that wraps the given SimpleTag and returns the
parent tag when getParent() is called.
|
| Modifier and Type | Method and Description |
|---|---|
int |
doEndTag()
Must not be called.
|
int |
doStartTag()
Must not be called.
|
JspTag |
getAdaptee()
Gets the tag that is being adapted to the Tag interface.
|
Tag |
getParent()
Returns the parent of this tag, which is always getAdaptee().getParent().
|
void |
release()
Must not be called.
|
void |
setPageContext(PageContext pc)
Must not be called.
|
void |
setParent(Tag parentTag)
Must not be called.
|
public TagAdapter(SimpleTag adaptee)
adaptee - The SimpleTag being adapted as a Tag.public void setPageContext(PageContext pc)
setPageContext in interface Tagpc - ignored.UnsupportedOperationException - Must not be calledpublic void setParent(Tag parentTag)
setParent in interface TagparentTag - ignored.UnsupportedOperationException - Must not be called.public Tag getParent()
getParent in interface TagTagSupport.findAncestorWithClass(javax.servlet.jsp.tagext.Tag, java.lang.Class)public JspTag getAdaptee()
public int doStartTag()
throws JspException
doStartTag in interface TagUnsupportedOperationException - Must not be calledJspException - never thrownBodyTagpublic int doEndTag()
throws JspException
doEndTag in interface TagUnsupportedOperationException - Must not be calledJspException - never thrownpublic void release()
release in interface TagUnsupportedOperationException - Must not be calledCopyright © 2000-2020 Apache Software Foundation. All Rights Reserved.