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4. AN IMPLEMENTATION 4.7. Generic to Original Syntax Converter %m.LBra%a.name%m.RBra%n ..(other patterns).. ServerType standalone Listing 4.9: Example FStr Listing 4.10: Apache parameter with a single value Note that in the example, the FStr is assigned to the Engine block and not to the block pattern. This happens because there are cases where the same pattern has different formats in a configuration file language. For example, a parameter in an Apache configuration file might have one (Listing 4.10) or multiple values (Listing 4.11), or an XML element might have one (Listing 4.12) or multiple sub-elements (Listing 4.13), which leads to multiple format strings. Therefore, FStr cannot be factorized in a single field, like Metadata. 4.7 Generic to Original Syntax Converter The Generic to Original syntax Converter contains two classes, PrinterMain and Printer. The first is used to interact with the user, while the second contains methods for the interpreta- tion and printing of the file in generic syntax (i.e., XML). Following is a deeper explanation of both classes. The PrinterMain class implements a main method which receives the location of the XML file in argument. It imports the XML document from the file to memory using the Java XML parsing API. Then, PrinterMain sends the document pointer and a stream to the Printer and the latter prints the final configuration file in original syntax to the stream in argument. The Printer class manages the printing of XML elements inside an XML file. It implements a single visible method, print. The print method is called by PrinterMain to print the entire XML document into a configuration file in its original syntax. It receives a stream and a NodeList object as arguments. NodeList refers to a DOM interface for the representation of lists of Node objects, whereas each Node object stands for XML components, such as elements, attributes or text nodes. Since the XML standard defines XML documents as having a single root node, PrinterMain calls Listing 4.11: Apache parameter with multiple values DirectoryIndex index.html index.htm index.shtml default.htm default.html index.php 48
4. AN IMPLEMENTATION 4.7. Generic to Original Syntax Converter Listing 4.12: XML element with a single subelement Listing 4.13: XML element with multiple elements the print method with the root node’s children, which is, in turn, a NodeList. The first element in the XML files generated by the tool is always Metadata, containing the information about the original syntax. This element aids the printing process and is not part of the final configuration file, therefore it must not be printed. The remainder of the elements are then printed. XML elements generated by the tool always contain an FStr field, corresponding to the format string of that element, explained in Section 4.6. All elements in the document are visited and printed according to their format string. If the current element has other child nodes, they must be printed as well. 49
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Universidade Nova de Lisboa Faculda
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To my family and friends, who suppo
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Sumário Entre os sectores de tecno
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CONTENTS 3.5 Modifying the Configur
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List of Figures 2.1 Virtual applian
Page 19 and 20: List of Listings 1.1 Apache configu
Page 21 and 22: 1 Introduction This dissertation pr
Page 23 and 24: 1. INTRODUCTION 1.2. Problem Descri
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Page 32 and 33: 2. STATE OF THE ART AND RELATED WOR
Page 41 and 42: 3 An application reconfiguration fr
Page 43 and 44: 3. AN APPLICATION RECONFIGURATION F
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Page 58 and 59: 4. AN IMPLEMENTATION 4.2. Parser Ge
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Page 64 and 65: 4. AN IMPLEMENTATION 4.5. Original
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Bibliography [Ama09] Amazon. Amazon
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BIBLIOGRAPHY [Sol09a] Evolve Space
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Dissertaç ˜ao de Mestrado Mestrado em Engenharia Informática Jo ...

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