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 /** The generic type info. Lazily initialized. */ 45 private volatile Type genericType; 46 47 // protected, to enforce use of static factory yet allow subclassing 48 protected FieldRepository(String rawSig, GenericsFactory f) { 49 super(rawSig, f); 50 } 51 52 protected TypeSignature parse(String s) { 53 return SignatureParser.make().parseTypeSig(s); 54 } 55 56 /** 57 * Static factory method. 58 * @param rawSig - the generic signature of the reflective object 59 * that this repository is servicing 60 * @param f - a factory that will provide instances of reflective 61 * objects when this repository converts its AST 62 * @return a {@code FieldRepository} that manages the generic type 63 * information represented in the signature {@code rawSig} 64 */ 65 public static FieldRepository make(String rawSig, GenericsFactory f) { 66 return new FieldRepository(rawSig, f); 67 } 68 69 /* 70 * When queried for a particular piece of type information, the 71 * general pattern is to consult the corresponding cached value. 72 * If the corresponding field is non-null, it is returned. 73 * If not, it is created lazily. This is done by selecting the appropriate 74 * part of the tree and transforming it into a reflective object 75 * using a visitor, which is created by feeding it the factory 76 * with which the repository was created. 77 */ 78 79 public Type getGenericType() { 80 Type value = genericType; 81 if (value == null) { 82 value = computeGenericType(); 83 genericType = value; 84 } 85 return value; 86 } 87 88 private Type computeGenericType() { 89 Reifier r = getReifier(); // obtain visitor 90 getTree().accept(r); // reify subtree 91 return r.getResult(); // extract result from visitor 92 } 93 }