Cache editor tools (don't create new instance for each menu item)

Author: cmaglie

app/src/processing/app/Editor.java

@@ -198,6 +198,8 @@ public boolean test(SketchController sketch) {
   private Runnable exportAppHandler;
   private Runnable timeoutUploadHandler;
 
+  private Map<String, Tool> internalToolCache = new HashMap<String, Tool>();
+
   public Editor(Base ibase, File file, int[] storedLocation, int[] defaultLocation, Platform platform) throws Exception {
     super("Arduino");
     this.base = ibase;
@@ -964,8 +966,7 @@ public void updateKeywords(PdeKeywords keywords) {
 
   JMenuItem createToolMenuItem(String className) {
     try {
-      Class<?> toolClass = Class.forName(className);
-      final Tool tool = (Tool) toolClass.newInstance();
+      final Tool tool = getOrCreateToolInstance(className);
 
       JMenuItem item = new JMenuItem(tool.getMenuTitle());
 
@@ -984,6 +985,20 @@ public void actionPerformed(ActionEvent e) {
     }
   }
 
+  private Tool getOrCreateToolInstance(String className) {
+    Tool internalTool = internalToolCache.get(className);
+    if (internalTool == null) {
+      try {
+        Class<?> toolClass = Class.forName(className);
+        internalTool = (Tool) toolClass.newInstance();
+      } catch (Exception e) {
+        e.printStackTrace();
+        return null;
+      }
+      internalToolCache.put(className, internalTool);
+    }
+    return internalTool;
+  }
 
   private void addInternalTools(JMenu menu) {
     JMenuItem item;