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tag handler methods will be called, and what the state of the page and container will be is important Understanding this protocol can help you write code that works as you expect Also important is to remember the tag itself doesn t exist in the generated servlet at run time the tag has been replaced by equivalent code that sets attributes and calls methods in the tag handler Let s consider each step in the flowchart

To start, the generated servlet needs to create an instance of the tag handler class It usually does so by invoking a method in a factory class that is part of the JSP container The factory class may maintain a pool of tag handler instances so it can reuse tag handlers that are no longer active Next, the tag handler instance is initialized and made aware of the state of the servlet in which it exists The servlet does this by calling two methods in the tag handler: setPageContext(Page The PageContext object contains references to all the Context ctx) JSP implicit object, and provides access to attributes at the page, request, session, and application level When the servlet calls this method, the tag handler should save the context in an instance variable so it will be available to all the handlers methods Note, the TagSupport base class does this automatically setParent(Tag parent) Tags in a JSP page may be nested, that is, contained within the body of another tag Immediately after setPageContext() is called, the servlet calls setParent(), passing a reference to the tag that contains this one, if any If the tag isn t nested, the parameter will be null Having access to enclosing tags makes it possible for a tag to call methods in any of its parents, which makes cooperative action practical The TagSupport class also saves this variable automatically

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If a tag supports attributes, the run-time values of these attributes are passed to the tag handler by means of setter methods, which the handler must supply For example, the database connection tag at the beginning of this chapter

public void setUrl(String value)

11:

that stores the value of the url attribute, most likely in a private instance variable For each attribute xxx coded in the start tag, the generated servlet will have a setXxx(value) method call These calls are located immediately after the setParent() call At this point, the tag handler s doStartTag() method is called The page context and parent tag have already been set, as have all the tag s attributes The method can read these variables and perform whatever calculations and operations necessary to implement the tag s functionality It can access the servlet output writer by calling pageContextgetOut() It can change the values of scripting variables in the JSP page by setting attributes in the page context This is examined in detail later in this chapter, in the section entitled Defining Scripting Variables If any fatal errors are encountered, the method should throw a JspException The doStartTag() method must return an integer return code, either SKIP_BODY or EVAL_BODY_INCLUDE If the return code from doStartTag() is EVAL_BODY_INCLUDE, then the body of the tag is handled as usual If the return code is SKIP_BODY, everything in the original JSP page up to this tag s end tag is ignored SKIP_BODY is the default return code of doStartTag() in the TagSupport base class, providing a rare instance of where TagSupport can actually perform a useful function without being subclassed you can use it as the handler for a custom tag that comments out code If you make the following entry in a TLD

<tag> <name>skip</name> <tagclass>javaxservletjsptagextTagSupport</tagclass> <bodycontent>JSP</bodycontent> </tag>

and it won t be executed at run time After the tag body is either evaluated or ignored, the tag handler s doEndTag() method is invoked Like doStartTag(), this method must return an integer return code that indicates how to proceed If the value is EVAL_PAGE, the rest of the page is evaluated; if it s SKIP_PAGE, the servlet code executes an immediate return from _jspService()

5 Well, not any part Scriptlets, expressions, standard actions, and HTML template data will be suppressed if they are inside the skip tag body, but you cannot use tags inside a scriptlet, expression, or declaration

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