public SimpleTagSupport() 
{

}

Sole constructor. (For invocation by subclass constructors, typically implicit.)

 public  void doTag() throws JspException, IOException 
{

}

Default processing of the tag does nothing.

 public static final JspTag findAncestorWithClass(JspTag from,
    Class<?> klass) 
{
	boolean isInterface = false;
	if (from == null || klass == null
	        || (!JspTag.class.isAssignableFrom(klass)
		    && !(isInterface = klass.isInterface()))) {
	    return null;
	}
	for (;;) {
	    JspTag parent = null;
	    if( from instanceof SimpleTag ) {
		parent = ((SimpleTag)from).getParent();
	    }
	    else if( from instanceof Tag ) {
		parent = ((Tag)from).getParent();
	    }
	    if (parent == null) {
		return null;
	    }
	    if (parent instanceof TagAdapter) {
		parent = ((TagAdapter) parent).getAdaptee();
	    }
	    if ((isInterface && klass.isInstance(parent))
		    || klass.isAssignableFrom(parent.getClass())) {
		return parent;
	    }
	    from = parent;
	}
}

Find the instance of a given class type that is closest to a given instance. This method uses the getParent method from the Tag and/or SimpleTag interfaces. This method is used for coordination among cooperating tags.

For every instance of TagAdapter encountered while traversing the ancestors, the tag handler returned by TagAdapter.getAdaptee() - instead of the TagAdpater itself - is compared to klass. If the tag handler matches, it - and not its TagAdapter - is returned.

The current version of the specification only provides one formal way of indicating the observable type of a tag handler: its tag handler implementation class, described in the tag-class subelement of the tag element. This is extended in an informal manner by allowing the tag library author to indicate in the description subelement an observable type. The type should be a subtype of the tag handler implementation class or void. This addititional constraint can be exploited by a specialized container that knows about that specific tag library, as in the case of the JSP standard tag library.

When a tag library author provides information on the observable type of a tag handler, client programmatic code should adhere to that constraint. Specifically, the Class passed to findAncestorWithClass should be a subtype of the observable type.

 protected JspFragment getJspBody() 
{
        return this.jspBody;
}

Returns the body passed in by the container via setJspBody.

 protected JspContext getJspContext() 
{
        return this.jspContext;
}

Returns the page context passed in by the container via setJspContext.

 public JspTag getParent() 
{
        return this.parentTag;
}

Returns the parent of this tag, for collaboration purposes.

 public  void setJspBody(JspFragment jspBody) 
{
        this.jspBody = jspBody;
}

Stores the provided JspFragment.

 public  void setJspContext(JspContext pc) 
{
        this.jspContext = pc;
}

Stores the provided JSP context in the private jspContext field. Subclasses can access the JspContext via getJspContext().

 public  void setParent(JspTag parent) 
{
        this.parentTag = parent;
}

Sets the parent of this tag, for collaboration purposes.

The container invokes this method only if this tag invocation is nested within another tag invocation.