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You have to add two extra parameters to the createSignature() method if you want to add a second signature. One parameter can be used to store the resulting PDF as a temporary file. If you pass a File object that s a directory, a temporary file will be created there; if it s a file, it will be used directly. The file will be deleted on exit unless the os output stream is null. In that case, the document can be retrieved directly from the temporary file. This is a way to keep the memory use low. In this example, you re signing a simple Hello World file. You don t need a temporary file; the signing will be done in memory. The fifth parameter of createSignature() indicates whether or not the file has to be manipulated in append mode. Working in append mode means that the original file will be kept intact; the new content will be appended after the %EOF marker.

This code instantiates a new Nokia.Accordion object. The first element says that <div> with div id = accordion that we set earlier will become the container for the accordion. The other options specify various configurable options for the widget. The accordion widget, for example, has a configuration option to set whether or not it is collapsible. Each widget has its own set of options that you can find from the documentation provided earlier. One last thing we need to do is to add Accordion to the Nokia.use function call that specifies which libraries are to be loaded. To do this, update the function call to look like this:

You can also use append mode if you want the file to keep the complete history of the changes made to the document. We ll look at the implications of using append mode outside the context of digital signatures in chapter 13.

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The first aspect of the Spring Framework that you ll notice is that it makes your Java code cleaner and easier to test by promoting the practice of coding to interfaces, a practice wellknown in object-oriented programming. Exposing a public contract (the interface) and being able to provide a suitable implementation of that interface seems like a no-brainer to most Java programmers, but unfortunately, previous versions of the Java EE framework, particularly EJB, made this very difficult with its heavy and bloated container contracts. The side effect of the pre-3.0 EJB APIs was that although they promoted a component-oriented development style, their particular implementation disregarded good object-oriented practices. Developers had to go through hoops implementing their own frameworks to test their components in isolation outside of the J2EE container. Most developers who came from building good object-oriented applications, when thrown under the wheels of the EJB bus, decided to take the path of most resistance, using EJB in an inverted fashion by first building robust, interface-driven by contract , object-oriented applications and using EJB as a layer to leverage multithreading, object pooling, and other container services. After all, there is much more to J2EE than just EJB, but unfortunately, the previous ill-designed versions of the EJB specification took the limelight

Using append mode is mandatory if you want to add content to a document that has been signed. If you set the append value to false, the original signature will be invalidated, as shown in figure 12.8. When a document is signed multiple times, you get a PDF file with multiple revisions (see the signature panel in figures 12.6 and 12.7). For one revision, the signature name is first ; for the other it s second . In figure 12.6, you can see a link

in the signature panel saying Click to view this version. This allows you to manually retrieve the original files for each signature. This listing shows how to extract such a revision programmatically.

Nokia.use('template-default', 'accordion', init);

public void extractFirstRevision() throws IOException { PdfReader reader = new PdfReader(SIGNED2); AcroFields af = reader.getAcroFields(); FileOutputStream os = new FileOutputStream(REVISION); byte bb[] = new byte[8192]; InputStream ip = af.extractRevision("first"); int n = 0; while ((n = ip.read(bb)) > 0) os.write(bb, 0, n); os.close(); ip.close(); }

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