1 files changed, 115 insertions, 0 deletions
diff --git a/src/uk/org/ury/backend/config/ConfigReader.java b/src/uk/org/ury/backend/config/ConfigReader.java
new file mode 100644
index 0000000..63403c9
--- /dev/null
+++ b/src/uk/org/ury/backend/config/ConfigReader.java
@@ -0,0 +1,115 @@
+package uk.org.ury.backend.config;
+
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+import org.w3c.dom.Node;
+import org.w3c.dom.NodeList;
+import org.xml.sax.SAXException;
+import org.xml.sax.SAXParseException;
+
+import uk.org.ury.backend.database.exceptions.MissingCredentialsException;
+
+/**
+ * Reads in an XML config file and creates config objects
+ * 
+ * @author Nathan Lasseter
+ */
+public class ConfigReader {
+
+	private Database database = null;
+	private Auth roAuth = null;
+	private Auth rwAuth = null;
+	
+	/**
+	 * Get the database configuration
+	 * 
+	 * @return Database database
+	 */
+	public Database getDatabase() { return database; }
+	/**
+	 * Get the read only login auth configuration
+	 * 
+	 * @return Auth roAauth
+	 */
+	public Auth getRoAuth() { return roAuth; }
+	/**
+	 * Get the read write login auth configuration
+	 * 
+	 * @return Auth rwAauth
+	 */
+	public Auth getRwAuth() { return rwAuth; }
+	
+	/**
+	 * Read in the config file and create the Database and Auth configuration objects.
+	 * Specify a config file.
+	 * @throws MissingCredentialsException 
+	 */
+	public ConfigReader(String configFile) throws MissingCredentialsException {
+		
+		try {
+			DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
+			DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
+			Document doc = docBuilder.parse (configFile);
+			doc.getDocumentElement().normalize();
+						
+			NodeList nList = doc.getElementsByTagName("auth");
+			for(int i = 0; i < nList.getLength(); i++) {
+				Node nNode = nList.item(i);
+				if(nNode.getNodeType() == Node.ELEMENT_NODE) {
+					Element eElement = (Element) nNode;
+					String user = getTagValue("user", eElement);
+					String pass = getTagValue("pass", eElement);
+					String sType = getTagValue("type", eElement);
+					if(sType.equalsIgnoreCase("read_only")) {
+						if(roAuth != null) continue;
+						roAuth = new Auth(user, pass);
+					} else if(sType.equalsIgnoreCase("read_write")) {
+						if(rwAuth != null) continue;
+						rwAuth = new Auth(user, pass);
+					} else {
+						throw new IllegalArgumentException("Unused user class.");
+					}
+				}
+			}
+			
+			nList = doc.getElementsByTagName("database");
+			for(int i = 0; i < nList.getLength(); i++) {
+				if(database != null) break;
+				Node nNode = nList.item(i);
+				if(nNode.getNodeType() == Node.ELEMENT_NODE) {
+					Element eElement = (Element) nNode;
+					String host = getTagValue("host", eElement);
+					String port = getTagValue("port", eElement);
+					String db = getTagValue("db", eElement);
+					database = new Database(host, Integer.parseInt(port.trim()), db);
+				}
+			}
+		}
+		
+		catch(NullPointerException n) {
+			throw new MissingCredentialsException("An element node is empty.");
+		}
+		
+		catch (SAXParseException err) {
+			System.out.println ("** Parsing error" + ", line " + err.getLineNumber () + ", uri " + err.getSystemId ());
+	        System.out.println(" " + err.getMessage ());
+		}
+		catch (SAXException e) {
+	        Exception x = e.getException ();
+	        ((x == null) ? e : x).printStackTrace ();
+		}
+		catch (Throwable t) {
+	        t.printStackTrace ();
+		}
+	}
+	
+	private static String getTagValue(String sTag, Element eElement){
+		NodeList nlList= eElement.getElementsByTagName(sTag).item(0).getChildNodes();
+		Node nValue = (Node) nlList.item(0);
+		
+		return nValue.getNodeValue();
+	}
+}