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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.repository; | ||
| 27 | |||
| 28 | |||
| 29 | import java.lang.reflect.Type; | ||
| 30 | import sun.reflect.generics.factory.GenericsFactory; | ||
| 31 | import sun.reflect.generics.tree.TypeSignature; | ||
| 32 | import sun.reflect.generics.parser.SignatureParser; | ||
| 33 | import sun.reflect.generics.visitor.Reifier; | ||
| 34 | |||
| 35 | |||
| 36 | |||
| 37 | /** | ||
| 38 | * This class represents the generic type information for a constructor. | ||
| 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 class FieldRepository extends AbstractRepository<TypeSignature> { | ||
| 43 | |||
| 44 | private Type genericType; // caches the generic type info | ||
| 45 | |||
| 46 | // protected, to enforce use of static factory yet allow subclassing | ||
| 47 | protected FieldRepository(String rawSig, GenericsFactory f) { | ||
| 48 | super(rawSig, f); | ||
| 49 | } | ||
| 50 | |||
| 51 | protected TypeSignature parse(String s) { | ||
| 52 | return SignatureParser.make().parseTypeSig(s); | ||
| 53 | } | ||
| 54 | |||
| 55 | /** | ||
| 56 | * Static factory method. | ||
| 57 | * @param rawSig - the generic signature of the reflective object | ||
| 58 | * that this repository is servicing | ||
| 59 | * @param f - a factory that will provide instances of reflective | ||
| 60 | * objects when this repository converts its AST | ||
| 61 | * @return a <tt>FieldRepository</tt> that manages the generic type | ||
| 62 | * information represented in the signature <tt>rawSig</tt> | ||
| 63 | */ | ||
| 64 | public static FieldRepository make(String rawSig, | ||
| 65 | GenericsFactory f) { | ||
| 66 | return new FieldRepository(rawSig, f); | ||
| 67 | } | ||
| 68 | |||
| 69 | // public API | ||
| 70 | |||
| 71 | /* | ||
| 72 | * When queried for a particular piece of type information, the | ||
| 73 | * general pattern is to consult the corresponding cached value. | ||
| 74 | * If the corresponding field is non-null, it is returned. | ||
| 75 | * If not, it is created lazily. This is done by selecting the appropriate | ||
| 76 | * part of the tree and transforming it into a reflective object | ||
| 77 | * using a visitor. | ||
| 78 | * a visitor, which is created by feeding it the factory | ||
| 79 | * with which the repository was created. | ||
| 80 | */ | ||
| 81 | |||
| 82 | public Type getGenericType(){ | ||
| 83 | if (genericType == null) { // lazily initialize generic type | ||
| 84 | Reifier r = getReifier(); // obtain visitor | ||
| 85 | getTree().accept(r); // reify subtree | ||
| 86 | // extract result from visitor and cache it | ||
| 87 | genericType = r.getResult(); | ||
| 88 | } | ||
| 89 | return genericType; // return cached result | ||
| 90 | } | ||
| 91 | } | ||