add file loading and path string extraction helper methods

src/com/blarg/gdx/io/FileHelpers.java

@@ -0,0 +1,37 @@
+package com.blarg.gdx.io;
+
+import com.badlogic.gdx.Files;
+import com.badlogic.gdx.Gdx;
+import com.badlogic.gdx.files.FileHandle;
+
+public final class FileHelpers {
+	public static String getPath(FileHandle file) {
+		return getPath(file.path());
+	}
+
+	public static String getPath(String filename) {
+		int pos = filename.lastIndexOf('/');
+		if (pos == -1)
+			return "";
+		else
+			return filename.substring(0, pos + 1);
+	}
+
+	public static boolean hasPath(String filename) {
+		return filename.contains("/");
+	}
+
+	public static FileHandle open(Files.FileType type, String path) {
+		if (path == null)
+			throw new IllegalArgumentException("path can not be null.");
+
+		switch (type) {
+			case Classpath: return Gdx.files.classpath(path);
+			case Internal:  return Gdx.files.internal(path);
+			case External:  return Gdx.files.external(path);
+			case Absolute:  return Gdx.files.absolute(path);
+			case Local:     return Gdx.files.local(path);
+			default:        throw new UnsupportedOperationException();
+		}
+	}
+}