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| 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.repository; | |
| 27 | + | |
| 28 | +import java.lang.reflect.TypeVariable; | |
| 29 | +import sun.reflect.generics.factory.GenericsFactory; | |
| 30 | +import sun.reflect.generics.tree.FormalTypeParameter; | |
| 31 | +import sun.reflect.generics.tree.Signature; | |
| 32 | +import sun.reflect.generics.visitor.Reifier; | |
| 33 | + | |
| 34 | + | |
| 35 | + | |
| 36 | +/** | |
| 37 | + * This class represents the generic type information for a generic | |
| 38 | + * declaration. | |
| 39 | + * The code is not dependent on a particular reflective implementation. | |
| 40 | + * It is designed to be used unchanged by at least core reflection and JDI. | |
| 41 | + */ | |
| 42 | +public abstract class GenericDeclRepository<S extends Signature> | |
| 43 | + extends AbstractRepository<S> { | |
| 44 | + | |
| 45 | + private TypeVariable[] typeParams; // caches the formal type parameters | |
| 46 | + | |
| 47 | + protected GenericDeclRepository(String rawSig, GenericsFactory f) { | |
| 48 | + super(rawSig, f); | |
| 49 | + } | |
| 50 | + | |
| 51 | + // public API | |
| 52 | + /* | |
| 53 | + * When queried for a particular piece of type information, the | |
| 54 | + * general pattern is to consult the corresponding cached value. | |
| 55 | + * If the corresponding field is non-null, it is returned. | |
| 56 | + * If not, it is created lazily. This is done by selecting the appropriate | |
| 57 | + * part of the tree and transforming it into a reflective object | |
| 58 | + * using a visitor. | |
| 59 | + * a visitor, which is created by feeding it the factory | |
| 60 | + * with which the repository was created. | |
| 61 | + */ | |
| 62 | + | |
| 63 | + /** | |
| 64 | + * Return the formal type parameters of this generic declaration. | |
| 65 | + * @return the formal type parameters of this generic declaration | |
| 66 | + */ | |
| 67 | + public TypeVariable/*<?>*/[] getTypeParameters(){ | |
| 68 | + if (typeParams == null) { // lazily initialize type parameters | |
| 69 | + // first, extract type parameter subtree(s) from AST | |
| 70 | + FormalTypeParameter[] ftps = getTree().getFormalTypeParameters(); | |
| 71 | + // create array to store reified subtree(s) | |
| 72 | + TypeVariable[] tps = new TypeVariable[ftps.length]; | |
| 73 | + // reify all subtrees | |
| 74 | + for (int i = 0; i < ftps.length; i++) { | |
| 75 | + Reifier r = getReifier(); // obtain visitor | |
| 76 | + ftps[i].accept(r); // reify subtree | |
| 77 | + // extract result from visitor and store it | |
| 78 | + tps[i] = (TypeVariable<?>) r.getResult(); | |
| 79 | + } | |
| 80 | + typeParams = tps; // cache overall result | |
| 81 | + } | |
| 82 | + return typeParams.clone(); // return cached result | |
| 83 | + } | |
| 84 | +} | |