21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package sun.reflect.generics.scope;
  27 
  28 import java.lang.reflect.TypeVariable;
  29 
  30 /**
  31  * This class is used to provide enclosing scopes for top level classes.
  32  * We cannot use <tt>null</tt> to represent such a scope, since the
  33  * enclosing scope is computed lazily, and so the field storing it is
  34  * null until it has been computed. Therefore, <tt>null</tt> is reserved
  35  * to represent an as-yet-uncomputed scope, and cannot be used for any
  36  * other kind of scope.
  37  */
  38 public class DummyScope implements Scope {
  39     // Caches the unique instance of this class; instances contain no data
  40     // so we can use the singleton pattern
  41     private static DummyScope singleton = new DummyScope();
  42 
  43     // constructor is private to enforce use of factory method
  44     private DummyScope(){}
  45 
  46     /**
  47      * Factory method. Enforces the singleton pattern - only one
  48      * instance of this class ever exists.
  49      */
  50     public static DummyScope make() {
  51         return singleton;
  52     }
  53 
  54     /**
  55      * Lookup a type variable in the scope, using its name. Always returns
  56      * <tt>null</tt>.
  57      * @param name - the name of the type variable being looked up
  58      * @return  null
  59      */
  60     public TypeVariable<?> lookup(String name) {return null;}
  61 }

  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package sun.reflect.generics.scope;
  27 
  28 import java.lang.reflect.TypeVariable;
  29 
  30 /**
  31  * This class is used to provide enclosing scopes for top level classes.
  32  * We cannot use <tt>null</tt> to represent such a scope, since the
  33  * enclosing scope is computed lazily, and so the field storing it is
  34  * null until it has been computed. Therefore, <tt>null</tt> is reserved
  35  * to represent an as-yet-uncomputed scope, and cannot be used for any
  36  * other kind of scope.
  37  */
  38 public class DummyScope implements Scope {
  39     // Caches the unique instance of this class; instances contain no data
  40     // so we can use the singleton pattern
  41     private static final DummyScope singleton = new DummyScope();
  42 
  43     // constructor is private to enforce use of factory method
  44     private DummyScope(){}
  45 
  46     /**
  47      * Factory method. Enforces the singleton pattern - only one
  48      * instance of this class ever exists.
  49      */
  50     public static DummyScope make() {
  51         return singleton;
  52     }
  53 
  54     /**
  55      * Lookup a type variable in the scope, using its name. Always returns
  56      * <tt>null</tt>.
  57      * @param name - the name of the type variable being looked up
  58      * @return  null
  59      */
  60     public TypeVariable<?> lookup(String name) {return null;}
  61 }