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copied!<p>I think Factory pattern is correct. Make abstracted <code>getInstance(fileName)</code>, <code>read</code>, <code>create</code>, <code>update</code>, <code>remove</code> methods. </p> <p>As a suggestion, you might want to return implemented instance after checking into the file content -- whther it's XML (by checking XML header or presence of root tag) or it's a properties file.</p> <hr> <p>Ideally, I would create a MyFileFactory class that looks like this</p> <pre><code> public class MyFileFactory{ public static final MyFileFactory getInstance(String filename){ //read the file header or first line to guess what instance to call int fileType = getFileType(fileName); if(fileType == MyFileFactory.XML_FILE) return new XMLFileEditor(fileName); else return new PropsFileEditor(fileName); } public abstract readFile(); public abstract writeToFile(); public abstract editFile(); } </code></pre> <p>have these classes to implement the methods</p> <pre><code> public class XMLFileEditor extends MyFileFactory{ ... private File f; } </code></pre> <p>and</p> <pre><code> public class PropsFileEditor extends MyFileFactory{ ... private File f; } </code></pre> <p>And I think you are good to go.</p> <hr> <p>If you want to save in database as well as in the file:</p> <pre><code> writeToFile(String new_Node_or_property){ //parseNode converts the property or XML node to an object MyNode node = MyNode.parseNode(new_Node_or_property); MyFileDAO.insert(node);//write a code that parse // write here code to append in the file based on what // filetype implentation it is -- XML, .properties, YAML whatever } </code></pre>

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