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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 | } | ||