TagAdapter (Java EE 5 SDK)

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Java EE 5 SDK

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javax.servlet.jsp.tagext Class TagAdapter

java.lang.Object
  extended by javax.servlet.jsp.tagext.TagAdapter
所有已实现的接口:
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.

从以下版本开始:
JSP 2.0

字段摘要
 
Fields inherited from interface javax.servlet.jsp.tagext.Tag
EVAL_BODY_INCLUDE, EVAL_PAGE, SKIP_BODY, SKIP_PAGE
 
构造器摘要
TagAdapter(SimpleTag adaptee)
          Creates a new TagAdapter that wraps the given SimpleTag and returns the parent tag when getParent() is called.
 
方法摘要
 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.
 
类方法继承 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

构造器详细信息

TagAdapter

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

参数:
adaptee - The SimpleTag being adapted as a Tag.

方法详细信息

setPageContext

public void setPageContext(PageContext pc)
Must not be called.

规范说明:
setPageContext in interface Tag
参数:
pc - ignored.
抛出异常:
UnsupportedOperationException - Must not be called

setParent

public void setParent(Tag parentTag)
Must not be called. The parent of this tag is always getAdaptee().getParent().

规范说明:
setParent in interface Tag
参数:
parentTag - ignored.
抛出异常:
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).

规范说明:
getParent in interface Tag
返回:
The parent of the tag being adapted.
另请参见:
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.

返回:
the tag that is being adapted

doStartTag

public int doStartTag()
               throws JspException
Must not be called.

规范说明:
doStartTag in interface Tag
返回:
always throws UnsupportedOperationException
抛出异常:
UnsupportedOperationException - Must not be called
JspException - never thrown
另请参见:
BodyTag

doEndTag

public int doEndTag()
             throws JspException
Must not be called.

规范说明:
doEndTag in interface Tag
返回:
always throws UnsupportedOperationException
抛出异常:
UnsupportedOperationException - Must not be called
JspException - never thrown

release

public void release()
Must not be called.

规范说明:
release in interface Tag
抛出异常:
UnsupportedOperationException - Must not be called
概述  软件包   类  树  已过时  索引  帮助 
Java EE 5 SDK

深圳电信培训中心.徐海蛟老师.
 上一个类   下一个类 框架    无框架    
摘要: 嵌套 | 字段 | 构造器 | 方法 详细信息: 字段 | 构造器 | 方法
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