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 sun.reflect.generics.factory.GenericsFactory; 29 import sun.reflect.generics.tree.ClassSignature; 30 import sun.reflect.generics.tree.TypeTree; 31 import sun.reflect.generics.visitor.Reifier; 32 import sun.reflect.generics.parser.SignatureParser; 33 import java.lang.reflect.Type; 34 35 36 /** 37 * This class represents the generic type information for a class. 38 * The code is not dependent on a particular reflective implementation. 39 * It is designed to be used unchanged by at least core reflection and JDI. 40 */ 41 public class ClassRepository extends GenericDeclRepository<ClassSignature> { 42 43 /** The generic superclass info. Lazily initialized. */ 44 private volatile Type superclass; 45 46 /** The generic superinterface info. Lazily initialized. */ 47 private volatile Type[] superInterfaces; 48 49 // private, to enforce use of static factory 50 private ClassRepository(String rawSig, GenericsFactory f) { 51 super(rawSig, f); 52 } 53 54 protected ClassSignature parse(String s) { 55 return SignatureParser.make().parseClassSig(s); 56 } 57 58 /** 59 * Static factory method. 60 * @param rawSig - the generic signature of the reflective object 61 * that this repository is servicing 62 * @param f - a factory that will provide instances of reflective 63 * objects when this repository converts its AST 64 * @return a <tt>ClassRepository</tt> that manages the generic type 65 * information represented in the signature <tt>rawSig</tt> 66 */ 67 public static ClassRepository make(String rawSig, GenericsFactory f) { 68 return new ClassRepository(rawSig, f); 69 } 70 71 // public API 72 /* 73 * When queried for a particular piece of type information, the 74 * general pattern is to consult the corresponding cached value. 75 * If the corresponding field is non-null, it is returned. 76 * If not, it is created lazily. This is done by selecting the appropriate 77 * part of the tree and transforming it into a reflective object 78 * using a visitor. 79 * a visitor, which is created by feeding it the factory 80 * with which the repository was created. 81 */ 82 83 public Type getSuperclass() { 84 Type superclass = this.superclass; 85 if (superclass == null) { // lazily initialize superclass 86 Reifier r = getReifier(); // obtain visitor 87 // Extract superclass subtree from AST and reify 88 getTree().getSuperclass().accept(r); 89 // extract result from visitor and cache it 90 superclass = r.getResult(); 91 this.superclass = superclass; 92 } 93 return superclass; // return cached result 94 } 95 96 public Type[] getSuperInterfaces() { 97 Type[] superInterfaces = this.superInterfaces; 98 if (superInterfaces == null) { // lazily initialize super interfaces 99 // first, extract super interface subtree(s) from AST 100 TypeTree[] ts = getTree().getSuperInterfaces(); 101 // create array to store reified subtree(s) 102 superInterfaces = new Type[ts.length]; 103 // reify all subtrees 104 for (int i = 0; i < ts.length; i++) { 105 Reifier r = getReifier(); // obtain visitor 106 ts[i].accept(r);// reify subtree 107 // extract result from visitor and store it 108 superInterfaces[i] = r.getResult(); 109 } 110 this.superInterfaces = superInterfaces; 111 } 112 return superInterfaces.clone(); // return cached result 113 } 114 }