Refactor some parts of NewLaunch (part 2)

libraries/launcher/org/multimc/LauncherFactory.java

@@ -0,0 +1,34 @@
+package org.multimc;
+
+import org.multimc.impl.OneSixLauncher;
+import org.multimc.utils.ParamBucket;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.function.Function;
+
+public final class LauncherFactory {
+
+    private static final LauncherFactory INSTANCE = new LauncherFactory();
+
+    private final Map<String, Function<ParamBucket, Launcher>> launcherRegistry = new HashMap<>();
+
+    private LauncherFactory() {
+        launcherRegistry.put("onesix", OneSixLauncher::new);
+    }
+
+    public Launcher createLauncher(String name, ParamBucket parameters) {
+        Function<ParamBucket, Launcher> launcherCreator =
+                launcherRegistry.get(name);
+
+        if (launcherCreator == null)
+            throw new IllegalArgumentException("Invalid launcher type: " + name);
+
+        return launcherCreator.apply(parameters);
+    }
+
+    public static LauncherFactory getInstance() {
+        return INSTANCE;
+    }
+
+}