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All template content is optional, which makes a single template useful to more Webpages. For example, Figure 2. Both pages have a header, footer, and main content. The inventory page has an edit panel which the login page lacks for making inventory changes. Web applications often discriminate content based on a user's role. For example, the same JSP template, which includes the edit panel only when the user's role is curator, produces the two pages shown in Figures 3.
The template used in Figures 3. The get tag includes content only if the user's role matches the role attribute. Let's look at how the tag handler for template:get uses the role attribute:. The insert tag includes a template, but before it does, put tags store information -- a name, URI, and Boolean value specifying whether content should be included or printed directly -- about the content the template includes.
To ensure that each template has access only to its own information, template:insert maintains a stack of hashtables. Each insert start tag creates a hashtable and pushes it on the stack.
The enclosed put tags create beans and store them in the newly created hashtable. Subsequently, get tags in the included template access the beans in the hashtable. Figure 4 shows how the stack is maintained for nested templates. Each template in Figure 4 accesses the correct footer; footer. If the beans were stored directly in request scope, step 5 in Figure 4 would overwrite the footer bean specified in step 2. The remainder of this article examines the implementation of the three template tags: insert , put , and get.
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