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 java.lang.reflect.Type; 29 import sun.reflect.generics.factory.GenericsFactory; 30 import sun.reflect.generics.tree.ClassSignature; 31 import sun.reflect.generics.tree.TypeTree; 32 import sun.reflect.generics.visitor.Reifier; 33 import sun.reflect.generics.parser.SignatureParser; 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 /** The generic superclass info. Lazily initialized. */ 46 private volatile Type superclass; 47 48 /** The generic superinterface info. Lazily initialized. */ 49 private volatile Type[] superInterfaces; 50 51 // private, to enforce use of static factory 52 private ClassRepository(String rawSig, GenericsFactory f) { 53 super(rawSig, f); 54 } 55 56 protected ClassSignature parse(String s) { 57 return SignatureParser.make().parseClassSig(s); 58 } 59 60 /** 61 * Static factory method. 62 * @param rawSig - the generic signature of the reflective object 63 * that this repository is servicing 64 * @param f - a factory that will provide instances of reflective 65 * objects when this repository converts its AST 66 * @return a {@code ClassRepository} that manages the generic type 67 * information represented in the signature {@code rawSig} 68 */ 69 public static ClassRepository make(String rawSig, GenericsFactory f) { 70 return new ClassRepository(rawSig, f); 71 } 72 73 /* 74 * When queried for a particular piece of type information, the 75 * general pattern is to consult the corresponding cached value. 76 * If the corresponding field is non-null, it is returned. 77 * If not, it is created lazily. This is done by selecting the appropriate 78 * part of the tree and transforming it into a reflective object 79 * using 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 value = superclass; 85 if (value == null) { 86 value = computeSuperclass(); 87 superclass = value; 88 } 89 return value; 90 } 91 92 public Type[] getSuperInterfaces() { 93 Type[] value = superInterfaces; 94 if (value == null) { 95 value = computeSuperInterfaces(); 96 superInterfaces = value; 97 } 98 return value.clone(); 99 } 100 101 private Type computeSuperclass() { 102 Reifier r = getReifier(); // obtain visitor 103 // Extract superclass subtree from AST and reify 104 getTree().getSuperclass().accept(r); 105 return r.getResult(); 106 } 107 108 private Type[] computeSuperInterfaces() { 109 // first, extract super interface subtree(s) from AST 110 TypeTree[] ts = getTree().getSuperInterfaces(); 111 // create array to store reified subtree(s) 112 int length = ts.length; 113 Type[] superInterfaces = new Type[length]; 114 // reify all subtrees 115 for (int i = 0; i < length; i++) { 116 Reifier r = getReifier(); // obtain visitor 117 ts[i].accept(r);// reify subtree 118 // extract result from visitor and store it 119 superInterfaces[i] = r.getResult(); 120 } 121 return superInterfaces; 122 } 123 }