1 /*
   2  * Copyright (c) 2003, 2004, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  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.Constructor;
  29 import java.lang.reflect.Method;
  30 
  31 
  32 /**
  33  * This class represents the scope containing the type variables of
  34  * a class.
  35  */
  36 public class ClassScope extends AbstractScope<Class<?>> implements Scope {
  37 
  38     // constructor is private to enforce use of factory method
  39     private ClassScope(Class<?> c){
  40         super(c);
  41     }
  42 
  43     /**
  44      * Overrides the abstract method in the superclass.
  45      * @return the enclosing scope
  46      */
  47     protected Scope computeEnclosingScope() {
  48         Class<?> receiver = getRecvr();
  49 
  50         Method m = receiver.getEnclosingMethod();
  51         if (m != null)
  52             // Receiver is a local or anonymous class enclosed in a
  53             // method.
  54             return MethodScope.make(m);
  55 
  56         Constructor<?> cnstr = receiver.getEnclosingConstructor();
  57         if (cnstr != null)
  58             // Receiver is a local or anonymous class enclosed in a
  59             // constructor.
  60             return ConstructorScope.make(cnstr);
  61 
  62         Class<?> c = receiver.getEnclosingClass();
  63         // if there is a declaring class, recvr is a member class
  64         // and its enclosing scope is that of the declaring class
  65         if (c != null)
  66             // Receiver is a local class, an anonymous class, or a
  67             // member class (static or not).
  68             return ClassScope.make(c);
  69 
  70         // otherwise, recvr is a top level class, and it has no real
  71         // enclosing scope.
  72         return DummyScope.make();
  73     }
  74 
  75     /**
  76      * Factory method. Takes a <tt>Class</tt> object and creates a
  77      * scope for it.
  78      * @param c - a Class whose scope we want to obtain
  79      * @return The type-variable scope for the class c
  80      */
  81     public static ClassScope make(Class<?> c) { return new ClassScope(c);}
  82 
  83 }