TagAdapter (Apache Tomcat 7.0.109 API Documentation)

java.lang.Object
- javax.servlet.jsp.tagext.TagAdapter

All Implemented Interfaces:

JspTag, Tag
```
public class TagAdapter
extends 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:

2.0

Field Summary
- Fields inherited from interface javax.servlet.jsp.tagext.Tag
  EVAL_BODY_INCLUDE, EVAL_PAGE, SKIP_BODY, SKIP_PAGE

Constructor Summary

Constructors
Constructor and Description

TagAdapter(SimpleTag adaptee)
Creates a new TagAdapter that wraps the given SimpleTag and returns the parent tag when getParent() is called.

Constructors
Constructor and Description
`TagAdapter(SimpleTag adaptee)` Creates a new TagAdapter that wraps the given SimpleTag and returns the parent tag when getParent() is called.

Method Summary

Methods
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.

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

- Constructor Detail
  - TagAdapter
```
public 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
  - setPageContext
```
public void setPageContext(PageContext pc)
```
    Must not be called.
    
    Specified by:
    
    setPageContext in interface Tag
    
    Parameters:
    pc - ignored.
    
    Throws:
    
    UnsupportedOperationException - Must not be called
  - setParent
```
public void setParent(Tag parentTag)
```
    Must not be called. The parent of this tag is always getAdaptee().getParent().
    
    Specified by:
    
    setParent in interface Tag
    
    Parameters:
    parentTag - ignored.
    
    Throws:
    
    UnsupportedOperationException - Must not be called.
  - getParent
```
public 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:
    
    getParent in interface Tag
    
    Returns:
    The parent of the tag being adapted.
    See Also:
    TagSupport.findAncestorWithClass(javax.servlet.jsp.tagext.Tag, java.lang.Class)
  - getAdaptee
```
public 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
  - doStartTag
```
public int doStartTag()
               throws JspException
```
    Must not be called.
    
    Specified by:
    
    doStartTag in interface Tag
    
    Returns:
    always throws UnsupportedOperationException
    
    Throws:
    
    UnsupportedOperationException - Must not be called
    
    JspException - never thrown
    See Also:
    BodyTag
  - doEndTag
```
public int doEndTag()
             throws JspException
```
    Must not be called.
    
    Specified by:
    
    doEndTag in interface Tag
    
    Returns:
    always throws UnsupportedOperationException
    
    Throws:
    
    UnsupportedOperationException - Must not be called
    
    JspException - never thrown
  - release
```
public void release()
```
    Must not be called.
    
    Specified by:
    
    release in interface Tag
    
    Throws:
    
    UnsupportedOperationException - Must not be called

Class TagAdapter

Field Summary

Fields inherited from interface javax.servlet.jsp.tagext.Tag

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

TagAdapter

Method Detail

setPageContext

setParent

getParent

getAdaptee

doStartTag

doEndTag

release