1 /* 2 * Copyright (c) 2003, 2013, 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 public static final ClassRepository NONE = ClassRepository.make("Ljava/lang/Object;", null); 44 45 private Type superclass; // caches the generic superclass info 46 private Type[] superInterfaces; // caches the generic superinterface info 47 48 // private, to enforce use of static factory 49 private ClassRepository(String rawSig, GenericsFactory f) { 50 super(rawSig, f); 51 } 52 53 protected ClassSignature parse(String s) { 54 return SignatureParser.make().parseClassSig(s); 55 } 56 57 /** 58 * Static factory method. 59 * @param rawSig - the generic signature of the reflective object 60 * that this repository is servicing 61 * @param f - a factory that will provide instances of reflective 62 * objects when this repository converts its AST 63 * @return a <tt>ClassRepository</tt> that manages the generic type 64 * information represented in the signature <tt>rawSig</tt> 65 */ 66 public static ClassRepository make(String rawSig, GenericsFactory f) { 67 return new ClassRepository(rawSig, f); 68 } 69 70 // public API 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 getSuperclass(){ 83 if (superclass == null) { // lazily initialize superclass 84 Reifier r = getReifier(); // obtain visitor 85 // Extract superclass subtree from AST and reify 86 getTree().getSuperclass().accept(r); 87 // extract result from visitor and cache it 88 superclass = r.getResult(); 89 } 90 return superclass; // return cached result 91 } 92 93 public Type[] getSuperInterfaces(){ 94 if (superInterfaces == null) { // lazily initialize super interfaces 95 // first, extract super interface subtree(s) from AST 96 TypeTree[] ts = getTree().getSuperInterfaces(); 97 // create array to store reified subtree(s) 98 Type[] sis = new Type[ts.length]; 99 // reify all subtrees 100 for (int i = 0; i < ts.length; i++) { 101 Reifier r = getReifier(); // obtain visitor 102 ts[i].accept(r);// reify subtree 103 // extract result from visitor and store it 104 sis[i] = r.getResult(); 105 } 106 superInterfaces = sis; // cache overall result 107 } 108 return superInterfaces.clone(); // return cached result 109 } 110 }