8014249: Add Modifer.parameterModifiers()

Reviewed-by: mduigou, mchung

src/share/classes/java/lang/reflect/Modifier.java

@@ -350,8 +350,19 @@ public class Modifier {
       return (mod & MANDATED) != 0;
     }
 
-    /**
-     * See JLSv3 section 8.1.1.
+    // Note on the FOO_MODIFIERS fields and fooModifiers() methods:
+    // the sets of modifiers are not guaranteed to be constants
+    // across time and Java SE releases. Therefore, it would not be
+    // appropriate to expose an external interface to this information
+    // that would allow the values to be treated as Java-level
+    // constants since the values could be constant folded and updates
+    // to the sets of modifiers missed. Thus, the fooModifiers()
+    // methods return an unchanging values for a given release, but a
+    // value that can potentially change over time.
+
+    /**
+     * The Java source modifiers that can be applied to a class.
+     * @jls 8.1.1 Class Modifiers
      */
     private static final int CLASS_MODIFIERS =
         Modifier.PUBLIC         | Modifier.PROTECTED    | Modifier.PRIVATE |
@@ -359,7 +370,8 @@ public class Modifier {
         Modifier.STRICT;
 
     /**
-     * See JLSv3 section 9.1.1.
+     * The Java source modifiers that can be applied to an interface.
+     * @jls 9.1.1 Interface Modifiers
      */
     private static final int INTERFACE_MODIFIERS =
         Modifier.PUBLIC         | Modifier.PROTECTED    | Modifier.PRIVATE |
@@ -367,13 +379,15 @@ public class Modifier {
 
 
     /**
-     * See JLSv3 section 8.8.3.
+     * The Java source modifiers that can be applied to a constructor.
+     * @jls 8.8.3 Constructor Modifiers
      */
     private static final int CONSTRUCTOR_MODIFIERS =
         Modifier.PUBLIC         | Modifier.PROTECTED    | Modifier.PRIVATE;
 
     /**
-     * See JLSv3 section 8.4.3.
+     * The Java source modifiers that can be applied to a method.
+     * @jls8.4.3  Method Modifiers
      */
     private static final int METHOD_MODIFIERS =
         Modifier.PUBLIC         | Modifier.PROTECTED    | Modifier.PRIVATE |
@@ -381,13 +395,21 @@ public class Modifier {
         Modifier.SYNCHRONIZED   | Modifier.NATIVE       | Modifier.STRICT;
 
     /**
-     * See JLSv3 section 8.3.1.
+     * The Java source modifiers that can be applied to a field.
+     * @jls 8.3.1  Field Modifiers
      */
     private static final int FIELD_MODIFIERS =
         Modifier.PUBLIC         | Modifier.PROTECTED    | Modifier.PRIVATE |
         Modifier.STATIC         | Modifier.FINAL        | Modifier.TRANSIENT |
         Modifier.VOLATILE;
 
+    /**
+     * The Java source modifiers that can be applied to a method or constructor parameter.
+     * @jls 8.4.1 Formal Parameters
+     */
+    private static final int PARAMETER_MODIFIERS =
+        Modifier.FINAL;
+
     /**
      *
      */
@@ -411,7 +433,7 @@ public class Modifier {
      * Return an {@code int} value OR-ing together the source language
      * modifiers that can be applied to an interface.
      * @return an {@code int} value OR-ing together the source language
-     * modifiers that can be applied to an inteface.
+     * modifiers that can be applied to an interface.
      *
      * @jls 9.1.1 Interface Modifiers
      * @since 1.7
@@ -446,7 +468,6 @@ public class Modifier {
         return METHOD_MODIFIERS;
     }
 
-
     /**
      * Return an {@code int} value OR-ing together the source language
      * modifiers that can be applied to a field.
@@ -459,4 +480,17 @@ public class Modifier {
     public static int fieldModifiers() {
         return FIELD_MODIFIERS;
     }
+
+    /**
+     * Return an {@code int} value OR-ing together the source language
+     * modifiers that can be applied to a parameter.
+     * @return an {@code int} value OR-ing together the source language
+     * modifiers that can be applied to a parameter.
+     *
+     * @jls 8.4.1 Formal Parameters
+     * @since 1.8
+     */
+    public static int parameterModifiers() {
+        return PARAMETER_MODIFIERS;
+    }
 }