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| 1 | /* | ||
| 2 | * Copyright (c) 2003, 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.GenericDeclaration; | ||
| 29 | import java.lang.reflect.TypeVariable; | ||
| 30 | |||
| 31 | |||
| 32 | |||
| 33 | /** | ||
| 34 | * Abstract superclass for lazy scope objects, used when building | ||
| 35 | * factories for generic information repositories. | ||
| 36 | * The type parameter <tt>D</tt> represents the type of reflective | ||
| 37 | * object whose scope this class is representing. | ||
| 38 | * <p> To subclass this, all one needs to do is implement | ||
| 39 | * <tt>computeEnclosingScope</tt> and the subclass' constructor. | ||
| 40 | */ | ||
| 41 | public abstract class AbstractScope<D extends GenericDeclaration> | ||
| 42 | implements Scope { | ||
| 43 | |||
| 44 | private D recvr; // the declaration whose scope this instance represents | ||
| 45 | private Scope enclosingScope; // the enclosing scope of this scope | ||
| 46 | |||
| 47 | /** | ||
| 48 | * Constructor. Takes a reflective object whose scope the newly | ||
| 49 | * constructed instance will represent. | ||
| 50 | * @param D - A generic declaration whose scope the newly | ||
| 51 | * constructed instance will represent | ||
| 52 | */ | ||
| 53 | protected AbstractScope(D decl){ recvr = decl;} | ||
| 54 | |||
| 55 | /** | ||
| 56 | * Accessor for the receiver - the object whose scope this <tt>Scope</tt> | ||
| 57 | * object represents. | ||
| 58 | * @return The object whose scope this <tt>Scope</tt> object represents | ||
| 59 | */ | ||
| 60 | protected D getRecvr() {return recvr;} | ||
| 61 | |||
| 62 | /** This method must be implemented by any concrete subclass. | ||
| 63 | * It must return the enclosing scope of this scope. If this scope | ||
| 64 | * is a top-level scope, an instance of DummyScope must be returned. | ||
| 65 | * @return The enclosing scope of this scope | ||
| 66 | */ | ||
| 67 | protected abstract Scope computeEnclosingScope(); | ||
| 68 | |||
| 69 | /** | ||
| 70 | * Accessor for the enclosing scope, which is computed lazily and cached. | ||
| 71 | * @return the enclosing scope | ||
| 72 | */ | ||
| 73 | protected Scope getEnclosingScope(){ | ||
| 74 | if (enclosingScope == null) {enclosingScope = computeEnclosingScope();} | ||
| 75 | return enclosingScope; | ||
| 76 | } | ||
| 77 | |||
| 78 | /** | ||
| 79 | * Lookup a type variable in the scope, using its name. Returns null if | ||
| 80 | * no type variable with this name is declared in this scope or any of its | ||
| 81 | * surrounding scopes. | ||
| 82 | * @param name - the name of the type variable being looked up | ||
| 83 | * @return the requested type variable, if found | ||
| 84 | */ | ||
| 85 | public TypeVariable<?> lookup(String name) { | ||
| 86 | TypeVariable[] tas = getRecvr().getTypeParameters(); | ||
| 87 | for (TypeVariable/*<?>*/ tv : tas) { | ||
| 88 | if (tv.getName().equals(name)) {return tv;} | ||
| 89 | } | ||
| 90 | return getEnclosingScope().lookup(name); | ||
| 91 | } | ||
| 92 | } | ||