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Note that the URI needn t refer to an actual file Rather, it s a unique identifier that enables the JSP container to search for in webxml for the actual file location Also note, this mapping technique only works for JAR files coded in the prescribed format (TLD in /META-INF/taglibtld) and some JSP container implementations are known to be buggy in this respect When in doubt, you can always put the JAR file in /WEB-INF/lib and the TLD in /WEB-INF/tlds, and refer to the /WEB-INF/tlds/filenametld directly in your JSP page

The following section describes the methods associated with the Tag interface and the TagSupport class

Table 11-1 lists the lifecycle methods that must be supported by classes implementing the Tag interface The interface also includes four constants that represent the possible return code from the doStartTag() and doEndTag() methods: I EVAL_BODY_INCLUDE When returned by doStartTag(), indicates the page implementation servlet should evaluate the tag body I SKIP_BODY When returned by doStartTag(), indicates the servlet should ignore the body of this tag

11:

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public void setPageContext The generated servlet calls this method first (PageContext ctx) before requiring the handler to do anything else The implementing class should save the context variable so it s available at any point in the tag lifecycle From the page context, the tag handler can access all the JSP implicit objects and can get and set attributes in any scope public void setParent (Tag parent) public Tag getParent() public int doStartTag() throws JspException Enables a tag to find the tag above it in the evaluation stack Called immediately after setPageContext Returns the parent tag Called after the page context, parent, and any attributes coded on the start tag have been set The return code indicates whether the JSP implementation servlet should evaluate the tag body (EVAL_BODY_INCLUDE) or not (SKIP_BODY) The method can throw a JspException to indicate a fatal error Called when the end tag has been encountered The return code indicates whether the JSP implementation servlet should continue with the rest of the page (EVAL_PAGE) or not (SKIP_PAGE) The method can throw a JspException to indicate a fatal error Guaranteed to be called before page exit Allows the tag handler to release any resources it holds and reset its state so it can be reused, if necessary

Figure 9-2

public void release()

Table 11-1

I EVAL_PAGE When returned by doEndTag(), indicates the rest of the page should be evaluated as usual I SKIP_PAGE When returned by doEndTag(), indicates the rest of the page should be skipped

javaxservletjsptagextTagSupport is a concrete class that implements the Tag interface In addition to the interface, the TagSupport class provides the additional methods listed in Table 11-2 Extending this class rather than directly implementing the interface is usually advantageous In addition to providing default implementations for all the required methods and storing the pageContext variable, TagSupport offers several convenience methods findAncestorWithClass() is particularly useful for supporting nested tags An outer tag, for example, can manage a set of objects as instance variables, providing public accessors that make these objects accessible to inner tags The database tag example later in this chapter illustrates the technique

The flowchart in Figure 11-2 describes the events in the life of a tag handler The process shown in the flowchart corresponds to the Java code the JSP container generates for a tag when the JSP page is translated into a servlet Knowing when each of your

public static Tag findAncestorWithClass(Tag thisTag, Class cls) public void setId(String id) public String getId()

In Listing 1-53 the result of the query is converted into a List(Of String) type. The output of this code snippet is Gray, Cops.

Looks in the run-time tag stack for the desired parent tag handler A tag handler can provide methods that child tags within its scope can call Stores or retrieves the name specified in the id attribute

Stores or retrieves a value under the public void setValue(String given name in a local hashtable name, Object o) public Object getValue(String name) public void removeValue(String name) public Enumeration getValues() Table 11-2 Removes the named value from the local hashtable Returns a javautilEnumeration of the keys in the hashtable

11:

Figure 11-2

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