Showing the changes to java/pkg/sun/reflect/generics/scope/AbstractScope.java (1 of 18352 files). Show all
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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 | +} | |