Showing the changes to java/pkg/sun/reflect/generics/repository/FieldRepository.java (1 of 18352 files). Show all
Unified · Split
| @@ -0,0 +1,91 @@ | ||
| 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 | +} | |