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When the design is clearly established, a team of programmers can work at the same time and implement the three tiers concurrently, which is one of the benefits of having a tiered architecture However, this rarely happens in practice, except for the largest projects that really need very careful design and planning In our case, usually the best way is to start with the lower levels (the database and data object) to have the basics established before creating the UI For this to happen, first you need to analyze what functionality you ll need for the UI; otherwise, you won t know what to write in the data and business tiers In this chapter, we will always start with the presentation tier You can do this because now you have a good overview of the architecture and know beforehand how you ll implement the other two tiers.

Methods that involve basic building blocks These are similar to the tableLayout() and cellLayout() methods discussed in the previous section, but instead of tables, they involve Chunks, Paragraphs, s, and Sections. These methods will be discussed in this section. Methods that involve the document and its pages These are called when the document is opened or closed, or when a page starts or ends. We ll discuss these methods in section 5.4.

When we discussed the Chunk object in section 2.2.1, there was an example (shown in figure 2.3) where we displayed country codes using a white font on a black background. This example demonstrated the setBackground() method. Figure 5.5 does something similar, but instead of a rectangular background, you draw a filmstrip for the year, and a blue ellipse for the link to the IMDB.

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Figure 6-29. Clearing the filter The filter is removed from the district labels, and all the districts are visible again.

This knowledge is necessary because in the presentation tier, you call methods from the business tier (which you haven t created yet), and in the business tier, you call the data tier (which, again, you haven t yet created) If you don t have a clear idea of how to implement the other tiers, starting with the presentation tier can be trickier in the long run..

There are no standard methods to draw special backgrounds for Chunks, but you can write your own custom Chunk functionality by implementing the onGenericTag() method of the PdfPageEvent interface.

class GenericTags extends PdfPageEventHelper { public void onGenericTag( PdfWriter writer, Document pdfDocument, Rectangle rect, String text) { if ("strip".equals(text)) strip(writer.getDirectContent(), rect); else if ("ellipse".equals(text)) ellipse(writer.getDirectContentUnder(), rect); else countYear(text); } public void strip( PdfContentByte content, Rectangle rect) { content.rectangle( rect.getLeft() - 1, rect.getBottom() - 5f, rect.getWidth(), rect.getHeight() + 8); content.rectangle( rect.getLeft(), rect.getBottom() - 2, rect.getWidth() - 2, rect.getHeight() + 2); float y1 = rect.getTop() + 0.5f; float y2 = rect.getBottom() - 4; for (float f = rect.getLeft(); f < rect.getRight() - 4; f += 5) { content.rectangle(f, y1, 4f, 1.5f); content.rectangle(f, y2, 4f, 1.5f); } content.eoFill(); } public void ellipse( PdfContentByte content, Rectangle rect) { content.saveState(); content.setRGBColorFill(0x00, 0x00, 0xFF); content.ellipse( rect.getLeft() - 3f, rect.getBottom() - 5f, rect.getRight() + 3f, rect.getTop() + 3f); content.fill(); content.restoreState(); } TreeMap<String, Integer> years = new TreeMap<String, Integer>(); public void countYear(String text) { Integer count = years.get(text); if (count == null) { years.put(text, 1); } else {

Because you already have a working architecture, it will be simple to write components as needed for each tier. Of course, if you had to implement something new or more complicated, we would have spent some time analyzing the full implications, but here you won t do anything more complicated than the code in the previous chapters. You ll apply the same technique for all componentized templates you ll build in this chapter.

years.put(text, count + 1); } } }

In addition to filtering the row and column labels, you can filter the values in the pivot table. You may want to view only the values that are within a certain range or exceed a specific amount. By filtering the values, you can limit what s shown in the pivot table and focus on only the values that are of current interest.

Instead of B, you could have written GenericTags implements PdfPageEvent, but then you d need to implement all the methods defined in the PdfPageEvent interface. Here you re only interested in the onGenericTag() method, so it s easier to extend the PdfPageEventHelper class. This class contains nothing but empty implementations of the interface s methods. In this example, you override one specific method, and you can safely ignore the other methods. The code in listing 5.8 won t be executed unless you declare the event to a writer. The onGenericTag() method will never be invoked if you don t define generic tags for Chunks.

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