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The versioning system we will present is perhaps less efficient than an ideal one, but it is also far less complex, and so easier to get up and running: we are simply going to preserve the old version of a file by renaming it, and we'll then create a new version of the target file rather than update the old version. This can be carried out automatically at regular intervals (perhaps by a cron job), or manually as necessary (just before a heavy editing session, for example). The following code fragment is a function to carry out such versioning. It can be found also as createVersionedBackup.php in the 11 folder of the downloadable archive of code for Pro PHP Security at http://www.apress.com. < php function save( $path, $content ) { // check that the operation is permitted if ( !is_writeable( $path ) ) return FALSE; // check whether the file exists already if ( file_exists( $path ) ) { // it does, so we must make a backup first // find the extension if it exists $pathParts = pathinfo ( $path ); $basename = $pathParts['basename']; $extension = $pathParts['extension']; // the backup will be named as follows: // date + time + original name + original extension $backup = date('Y-m-d-H-i-s') . '_' . $basename; if ( $extension ) $backup .= '.' . $extension;

namespace: http://foo.com tag1: copyright source1: copyright.xhtml tag2: ... source2: ...

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$success = rename( $path, $backup ); if ( !$success ) return FALSE; } // now we can safely write the new file $success = file_put_contents( $path, $content ); return $success; } > This straightforward function takes two parameters: the path (that is, the fully qualified name of the original file) and the new contents of the file. After checking that the operation is permissible (previously existing permissions may no longer be valid for a variety of reasons, ranging from software upgrades to job reclassifications), you look for an existing version (containing the current version of the content). If you find that file, you move it to a versioned copy by renaming it with a serial version number (consisting in this example of a prepended date and time, which allows easy sorting of the backup files). You then save a new version of the file with the original name, which contains the new content.

In this chapter, we completed the description of the various versions of the online bookshop example and explained what we had to do in order to convert standard JSP syntax to XML syntax and to use JSF. With this chapter, we complete the main body of the book. We shocked you with a demanding first chapter, talked about Java and JSP in 2, described HTTP and HTML in 3, introduced SQL and the handling of databases in 4, showed examples of JSF in 5, covered XML in 6, and described Tomcat s architecture in 7. Next, eight appendixes will give you detailed information on what we ve described through the examples in the main eight chapters. Appendix A will explain how to install all the packages we ve referred to, Appendixes B through F will provide a reference for what we covered in s 1 to 5, Appendix G will provide some information on the Eclipse integrated development environment (IDE), and Appendix H will list all the acronyms we ve used in this book. What more is there to say We hope that you ll find this book useful. In a few cases, we could have gone a bit deeper or provided additional examples, but we had to set limits somewhere! We wish you all the best. Good programming!

This means that you re defining a tag library instead of just a single tag. You would put such a tag lib definition into a file in a folder named META-INF in the classpath. The file name must end with .taglib.xml, such as foo.taglib.xml. On startup, JSF will look for such file names and load the definitions. Now, let s do it. Create a new dynamic web project named CustomComp. Create p1.xhtml as shown in Listing 5 3. Here p1 stands for page 1 and serves as a simple page to use your <copyright> tag. Listing 5 3. Sample Page Using the Custom Tag

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