0N/A/*
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2362N/A * by Oracle in the LICENSE file that accompanied this code.
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0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
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0N/A */
0N/A
0N/Apackage sun.reflect.generics.scope;
0N/A
0N/Aimport java.lang.reflect.TypeVariable;
0N/A
0N/A/**
0N/A * This class is used to provide enclosing scopes for top level classes.
0N/A * We cannot use <tt>null</tt> to represent such a scope, since the
0N/A * enclosing scope is computed lazily, and so the field storing it is
0N/A * null until it has been computed. Therefore, <tt>null</tt> is reserved
0N/A * to represent an as-yet-uncomputed scope, and cannot be used for any
0N/A * other kind of scope.
0N/A */
0N/Apublic class DummyScope implements Scope {
0N/A // Caches the unique instance of this class; instances contain no data
0N/A // so we can use the singleton pattern
0N/A private static DummyScope singleton = new DummyScope();
0N/A
0N/A // constructor is private to enforce use of factory method
0N/A private DummyScope(){}
0N/A
0N/A /**
0N/A * Factory method. Enforces the singleton pattern - only one
0N/A * instance of this class ever exists.
0N/A */
0N/A public static DummyScope make() {
0N/A return singleton;
0N/A }
0N/A
0N/A /**
0N/A * Lookup a type variable in the scope, using its name. Always returns
0N/A * <tt>null</tt>.
0N/A * @param name - the name of the type variable being looked up
0N/A * @return null
0N/A */
0N/A public TypeVariable<?> lookup(String name) {return null;}
0N/A}