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fruit = "orange" case fruit when "orange" color = "orange" when "apple" color = "green" when "banana" color = "yellow" else color = "unknown" end

In the previous chapter, you learned how to extract all the images from a page, but what if you want to pick one specific image programmatically An image is a stored in a stream object. Each stream consists of a dictionary followed by zero or more bytes bracketed between the keywords stream and endstream (see table 13.2). The entries of the stream dictionary are filled in by iText. In the case of images, you ll have at least entries for the width and the height of the image, and a value defining the compression filter, but there s no reference to the original filename. The original bits and bytes of the image may have been changed completely. One of the mailing-list subscribers wanted to solve the problem of retrieving specific images by adding an extra entry to the image stream dictionary. Listing 16.1 was written in answer to his question.

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This code is similar to the if block, except that the syntax is a lot cleaner. A case block works by processing an expression first, and then by finding a contained when block that matches the result of that expression. If no matching when block is found, then the else block within the case block is executed instead. case has another trick up its sleeve. As all Ruby expressions return a result, you can make the previous example even shorter:

Image img = Image.getInstance(RESOURCE); img.scaleAbsolute(400, 300); img.setAbsolutePosition(0, 0); PdfImage stream = new PdfImage(img, "", null); stream.put(new PdfName("ITXT_SpecialId"), new PdfName("123456789")); PdfIndirectObject ref = writer.addToBody(stream); img.setDirectReference(ref.getIndirectReference()); document.add(img);

fruit = "orange" color = case fruit when "orange" "orange" when "apple" "green" when "banana" "yellow" else "unknown" end

You create an instance of the high-level Image object, and set some properties, as described in chapter 2. You use this Image object to create a low-level PdfImage object. This object extends the PdfStream class. With the second parameter, you can pass a name for the image; the third parameter can be used for the reference to a mask image.

In this example, you use a case block, but you assign the result of whichever inner block is executed directly to color.

PdfStream extends PdfDictionary. Just like with plain dictionaries, you can add key-

In previous sections, you ve performed loops using iterator methods, like so:

value pairs. In this case, you choose a name for the key using the prefix reserved for iText (ITXT): ITXT_SpecialId. The value of the entry is also a name of your choice, in this case /123456789.

1.upto(5) { |number| puts number }

You add the stream object to the body of the file that is written by the PdfWriter object. The addToBody() method returns a PdfIndirectObject. Because it s the first element that s added to the writer in this example, the reference of this object will be 1 0 R.

1 2 3 4 5

1. The user is presented with a login dialog box. 2. The user enters a login name and a password. 3. The user submits the information. 4. The name and password are checked and verified. 5. The user is presented with a supply request screen. Although this scenario depicts the most common processing involved with the Login use case, you may need other scenarios to describe anticipated alternate outcomes. The following scenario describes an alternate processing of the Login use case: 1. The user is presented with a login dialog box. 2. The user enters a login name and a password. 3. The user submits the information. 4. The name and password are checked but cannot be verified. 5. The user is informed of the incorrect login information. 6. The user is presented with a login dialog box again. 7. The user either tries again or cancels the login request. At this point, it may help to create a visual representation of the scenarios outlined for the use case. Remember from 3 that activity diagrams are often used to visualize use case processing. Figure 4-10 shows an activity diagram constructed for the Login use case scenarios.

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