Added ScriptRuntime.newInstanceOrNull to call class.newInstance() and return null if it fails. It allows to replace in few places try/3 different catch by a simple method call.

js/rhino/src/org/mozilla/javascript/ClassNameHelper.java

@@ -49,11 +49,8 @@ public abstract class ClassNameHelper {
                 "org.mozilla.javascript.optimizer.OptClassNameHelper");
             // nameHelperClass == null if running lite
             if (nameHelperClass != null) {
-                try {
-                    helper = (ClassNameHelper)nameHelperClass.newInstance();
-                } catch (IllegalAccessException x) {
-                } catch (InstantiationException x) {
-                }
+                helper = (ClassNameHelper)ScriptRuntime.newInstanceOrNull(
+                                              nameHelperClass);
             }
             if (helper != null) {
                 savedNameHelper = helper;

js/rhino/src/org/mozilla/javascript/Context.java

@@ -2031,21 +2031,14 @@ public class Context {
                              "org.mozilla.javascript.optimizer.Codegen");
 
     private Interpreter createCompiler() {
+        Interpreter result = null;
         if (optimizationLevel >= 0 && codegenClass != null) {
-            try {
-                return (Interpreter) codegenClass.newInstance();
+            result = (Interpreter)ScriptRuntime.newInstanceOrNull(codegenClass);
         }
-            catch (SecurityException x) {
+        if (result == null) {
+            result = new Interpreter();
         }
-            catch (IllegalArgumentException x) {
-            }
-            catch (InstantiationException x) {
-            }
-            catch (IllegalAccessException x) {
-            }
-            // fall through
-        }
-        return new Interpreter();
+        return result;
     }
 
     private Parser createParser(IRFactory irf) {
@@ -2109,12 +2102,7 @@ public class Context {
             Class cl = ScriptRuntime.getClassOrNull(
                           "org.mozilla.javascript.regexp.RegExpImpl");
             if (cl != null) {
-                try {
-                    regExpProxy = (RegExpProxy) cl.newInstance();
-                    return regExpProxy;
-                } catch (InstantiationException e) {
-                } catch (IllegalAccessException e) {
-                }
+                regExpProxy = (RegExpProxy)ScriptRuntime.newInstanceOrNull(cl);
             }
         }
         return regExpProxy;

js/rhino/src/org/mozilla/javascript/Delegator.java

@@ -76,6 +76,25 @@ public class Delegator implements Function {
         this.obj = obj;
     }
 
+    /**
+     * Crete new Delegator instance.
+     * The default implementation calls this.getClass().newInstance().
+     *
+     * @see #construct(Context cx, Scriptable scope, Object[] args)
+     */
+    protected Delegator newInstance()
+    {
+        Exception ex;
+        try {
+            return (Delegator)this.getClass().newInstance();
+        } catch (InstantiationException e) {
+            ex = e;
+        } catch (IllegalAccessException e) {
+            ex = e;
+        }
+        throw WrappedException.wrapException(ex);
+    }
+
     /**
      * Retrieve the delegee.
      *
@@ -232,17 +251,16 @@ public class Delegator implements Function {
         if (obj == null) {
             //this little trick allows us to declare prototype objects for
             //Delegators
-            try {
-                Delegator n = (Delegator)this.getClass().newInstance();
-                n.setDelegee((Scriptable)args[0]);
+            Delegator n = newInstance();
+            Scriptable delegee;
+            if (args.length == 0) {
+                delegee = Undefined.instance;
+            } else {
+                delegee = ScriptRuntime.toObject(cx, scope, args[0]);
+            }
+            n.setDelegee(delegee);
             return n;
         }
-            catch (Exception e) {
-                e.printStackTrace();
-                System.exit(0);
-            }
-            return null;
-        }
         else {
             return ((Function)obj).construct(cx,scope,args);
         }

js/rhino/src/org/mozilla/javascript/FunctionObject.java

@@ -689,12 +689,7 @@ public class FunctionObject extends BaseFunction {
     private static Invoker newInvokerMaster() {
         Class cl = ScriptRuntime.getClassOrNull(INVOKER_MASTER_CLASS);
         if (cl != null) {
-            try {
-                return (Invoker)cl.newInstance();
-            }
-            catch (IllegalAccessException ex) {}
-            catch (InstantiationException ex) {}
-            catch (SecurityException ex) {}
+            return (Invoker)ScriptRuntime.newInstanceOrNull(cl);
         }
         return null;
     }

js/rhino/src/org/mozilla/javascript/ScriptRuntime.java

@@ -1826,12 +1826,7 @@ public class ScriptRuntime {
     {
         Context cx = Context.enter();
         try {
-            Script script = null;
-            try {
-                script = (Script)scriptClass.newInstance();
-            } catch (InstantiationException e) {
-            } catch (IllegalAccessException e) {
-            }
+            Script script = (Script)newInstanceOrNull(scriptClass);
             if (script == null) {
                 throw new RuntimeException("Error creating script object");
             }
@@ -2031,6 +2026,17 @@ public class ScriptRuntime {
         return null;
     }
 
+    static Object newInstanceOrNull(Class cl)
+    {
+        try {
+            return cl.newInstance();
+        } catch (SecurityException x) {
+        } catch (InstantiationException x) {
+        } catch (IllegalAccessException x) {
+        }
+        return null;
+    }
+
     static boolean hasProp(Scriptable start, String name) {
         Scriptable m = start;
         do {