Figure 144 Sample classes for two-step rendering in Java

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Figure 144 Sample classes for two-step rendering
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Two Step View's key value comes from the separation of first and second stages, allowing you to make global changes more easily It helps to think of two situations: multiappearance Web applications and singleappearance Web applications Multiappearance apps are the rarer breed but a growing one In them the same basic functionality is provided through multiple organizations and each organization has its own distinct look A current example of this is airline travel sites, where as you look at them you can tell from the page layout and design that they're all variations on one base site I suspect many airlines want that same functionality but with a distinctly individual appearance
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Single-appearance apps are more common Only one organization fronts them, and they want a consistent look throughout the site This makes them the easiest case to consider first
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With a single-stage view (either Template View (350) or Transform View (361), you build one view module per Web page (see Figure 146) With a Two Step View you have two stages: one first-stage module per page and one second-stage module for the entire application (Figure 147) Your pay-off in using Two Step View is that any change to the appearance of the site in the second stage is much easier to make, since one secondstage change affects the site as a whole
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Figure 146 Single-stage view with one appearance
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Figure 147 Two-stage view with one appearance
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Figure 145 Sequence diagram for two-step rendering
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With a multiappearance app this advantage is compounded because you have a single-stage view for each combination of screen and appearance (Figure 148) Thus, ten screens and three appearances require thirty single stage view modules Using Two Step View, however (see Figure 149), you can get away with ten first stages and three second stages The more screens and appearances you have, the bigger the saving
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Figure 148 Single-stage view with two appearances
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Figure 149 Two-stage view with two appearances
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Nevertheless, your ability to pull this off is entirely dependent on how well you can make the presentationoriented structure to really serve the needs of the appearance A design-heavy site, where each page is supposed to look different, won't work well with Two Step View because it's hard to find enough commonality between the screens to get a simple enough presentation-oriented structure Essentially the site design is constrained by the presentation-oriented structure, and for many sites that's too much of a limitation
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Another drawback of Two Step View is the tools required to use it There are a lot of tools for designers with no programming skills to lay out HTML pages using Template View (350), but Two Step View forces programmers to write the renderer and controller objects Thus programmers have to be involved in any design change
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It's also true that Two Step View, with its multiple layers, presents a harder programming model to learn, although once you're used to it it's not that difficult, and may help reduce repetitive boilerplate code
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A variation on the theme of multiple appearances is providing different second stages for different devices, so you can have one second stage for a browser and another for a PDA The usual limitation here is that both appearances must follow the same logical screen, and for very different devices this may be too much to ask
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Example: Two Stage XSLT (XSLT)
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This approach to a Two Step View uses a two-stage XLST transformation The first stage transforms domainspecific XML into logical screen XML; the second transforms the logical screen XML into HTML
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The initial domain oriented XML looks like this:
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<album> <title>Zero Hour</title> <artist>Astor Piazzola</artist> <trackList> <track><title>Tanguedia III</title><time>4:39</time></track> <track><title>Milonga del Angel</title><time>6:30</time></track> <track><title>Concierto Para Quinteto</title><time>9:00</time></track> <track><title>Milonga Loca</title><time>3:05</time></track> <track><title>Michelangelo '70</title><time>2:50</time></track> <track><title>Contrabajisimo</title><time>10:18</time></track> <track><title>Mumuki</title><time>9:32</time></track> </trackList> </album>
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The first stage XSLT processor transforms it into this screen-oriented XML:
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<screen> <title>Zero Hour</title> <field label="Artist">Astor Piazzola</field> <table> <row><cell>Tanguedia III</cell><cell>4:39</cell></row> <row><cell>Milonga del Angel</cell><cell>6:30</cell></row> <row><cell>Concierto Para Quinteto</cell><cell>9:00</cell></row> <row><cell>Milonga Loca</cell><cell>3:05</cell></row> <row><cell>Michelangelo '70</cell><cell>2:50</cell></row> <row><cell>Contrabajisimo</cell><cell>10:18</cell></row> <row><cell>Mumuki</cell><cell>9:32</cell></row> </table> </screen>
To do this we need the following XSLT program:
<xsl:template match="album"> <screen><xsl:apply-templates/></screen> </xsl:template> <xsl:template match="album/title"> <title><xsl:apply-templates/></title> </xsl:template> <xsl:template match="artist"> <field label="Artist"><xsl:apply-templates/></field> </xsl:template> <xsl:template match="trackList"> <table><xsl:apply-templates/></table> </xsl:template> <xsl:template match="track"> <row><xsl:apply-templates/></row> </xsl:template> <xsl:template match="track/title"> <cell><xsl:apply-templates/></cell> </xsl:template> <xsl:template match="track/time"> <cell><xsl:apply-templates/></cell> </xsl:template>