Added old project initial commit

src/main/java/net/locusworks/lsproject/util/Utility.java

@@ -0,0 +1,72 @@
+package net.locusworks.lsproject.util;
+
+import java.io.*;
+
+import net.locusworks.lsproject.object.Network;
+
+
+public final class Utility {
+	public static final String FILE_EXTENSION = ".lsa";
+	
+	/**
+	 * Save a network to disk. It uses it's name + the file extension FILE_EXTENSION.
+	 * @param network Network to save.
+	 * @throws IOException Thrown if an IO error occurs during write.
+	 */
+	public static void saveNetwork() throws IOException {
+		FileOutputStream out = new FileOutputStream(Network.getInstance().getName() + FILE_EXTENSION);
+		ObjectOutputStream objectOut = new ObjectOutputStream(out);
+		
+		objectOut.writeObject(Network.getInstance());
+		
+		objectOut.flush();
+		objectOut.close();
+		out.close();
+		
+		System.out.println("Wrote network " + Network.getInstance().getName() + " to file.");
+	}
+	
+	/**
+	 * Load an existing network object file from disk.
+	 * @param networkFile File to load.
+	 * @return Network object.
+	 * @throws IOException Thrown if an IO error occurs during read.
+	 */
+	public static void loadNetwork(File networkFile) throws IOException {
+		if (!networkFile.getName().endsWith(FILE_EXTENSION)) {
+			throw new IOException("Invalid network object file.");
+		}
+		
+		FileInputStream in = new FileInputStream(networkFile);
+		ObjectInputStream objectIn = new ObjectInputStream(in);
+		
+		try {
+			Network.createInstance((Network)objectIn.readObject());
+		}
+		catch (ClassNotFoundException e) {
+			throw new IOException("Target file is corrupted.");
+		}
+		finally {
+			objectIn.close();
+			in.close();
+		}
+		
+		System.out.println("Loaded network " + Network.getInstance().getName() + ".");
+	}
+	
+	/**
+	 * Utility function for getting a file's extension.
+	 * @param f File to look at.
+	 * @return Extension of the file.
+	 */
+	public static String getExtension(File f) {
+        String ext = null;
+        String s = f.getName();
+        int i = s.lastIndexOf('.');
+
+        if (i > 0 &&  i < s.length() - 1) {
+            ext = s.substring(i+1).toLowerCase();
+        }
+        return ext;
+    }
+}