Comment the PluginManager and change pluginFor to functionFor

src/org/nwapw/abacus/plugin/PluginManager.java

@@ -1,42 +1,71 @@
 package org.nwapw.abacus.plugin;
 
+import org.nwapw.abacus.function.Function;
+
 import java.lang.reflect.InvocationTargetException;
 import java.util.ArrayList;
 import java.util.HashMap;
 
+/**
+ * A class that controls instances of plugins, allowing for them
+ * to interact with each other and the calculator.
+ */
 public class PluginManager {
 
+    /**
+     * A list of loaded plugins.
+     */
     private ArrayList<Plugin> plugins;
-    private HashMap<String, Plugin> pluginsForFunctions;
+    /**
+     * List of functions that have been cached,
+     * that is, found in a plugin and returned.
+     */
+    private HashMap<String, Function> cachedFunctions;
 
+    /**
+     * Creates a new plugin manager.
+     */
     public PluginManager(){
         plugins = new ArrayList<>();
-        pluginsForFunctions = new HashMap<>();
+        cachedFunctions = new HashMap<>();
     }
 
-    public Plugin pluginForFunction(String name){
-        if(pluginsForFunctions.containsKey(name)) {
-            return pluginsForFunctions.get(name);
+    /**
+     * Gets a function under the given name.
+     * @param name the name of the function
+     * @return the function under the given name.
+     */
+    public Function functionFor(String name){
+        if(cachedFunctions.containsKey(name)) {
+            return cachedFunctions.get(name);
         }
 
-        Plugin foundPlugin = null;
+        Function loadedFunction = null;
         for(Plugin plugin : plugins){
-            if(plugin.hasFunction(name)) {
-                foundPlugin = plugin;
+            if(plugin.hasFunction(name)){
+                loadedFunction = plugin.getFunction(name);
                 break;
             }
         }
-        pluginsForFunctions.put(name, foundPlugin);
-
-        return foundPlugin;
+        cachedFunctions.put(name, loadedFunction);
+        return loadedFunction;
     }
 
+    /**
+     * Adds an instance of Plugin that already has been instantiated.
+     * @param plugin the plugin to add.
+     */
     public void addInstantiated(Plugin plugin){
         plugin.load();
-        pluginsForFunctions.clear();
+        cachedFunctions.clear();
         plugins.add(plugin);
     }
 
+    /**
+     * Instantiates a class of plugin, and adds it to this
+     * plugin manager.
+     * @param newClass the new class to instantiate.
+     */
     public void addClass(Class<?> newClass){
         if(!Plugin.class.isAssignableFrom(newClass)) return;
         try {