J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003-2004 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any 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.parser.SignatureParser; |
| 31 | import sun.reflect.generics.tree.FieldTypeSignature; |
| 32 | import sun.reflect.generics.tree.MethodTypeSignature; |
| 33 | import sun.reflect.generics.tree.TypeSignature; |
| 34 | import sun.reflect.generics.visitor.Reifier; |
| 35 | |
| 36 | |
| 37 | |
| 38 | /** |
| 39 | * This class represents the generic type information for a constructor. |
| 40 | * The code is not dependent on a particular reflective implementation. |
| 41 | * It is designed to be used unchanged by at least core reflection and JDI. |
| 42 | */ |
| 43 | public class ConstructorRepository |
| 44 | extends GenericDeclRepository<MethodTypeSignature> { |
| 45 | |
| 46 | private Type[] paramTypes; // caches the generic parameter types info |
| 47 | private Type[] exceptionTypes; // caches the generic exception types info |
| 48 | |
| 49 | // protected, to enforce use of static factory yet allow subclassing |
| 50 | protected ConstructorRepository(String rawSig, GenericsFactory f) { |
| 51 | super(rawSig, f); |
| 52 | } |
| 53 | |
| 54 | protected MethodTypeSignature parse(String s) { |
| 55 | return SignatureParser.make().parseMethodSig(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>ConstructorRepository</tt> that manages the generic type |
| 65 | * information represented in the signature <tt>rawSig</tt> |
| 66 | */ |
| 67 | public static ConstructorRepository make(String rawSig, |
| 68 | GenericsFactory f) { |
| 69 | return new ConstructorRepository(rawSig, f); |
| 70 | } |
| 71 | |
| 72 | // public API |
| 73 | |
| 74 | /* |
| 75 | * When queried for a particular piece of type information, the |
| 76 | * general pattern is to consult the corresponding cached value. |
| 77 | * If the corresponding field is non-null, it is returned. |
| 78 | * If not, it is created lazily. This is done by selecting the appropriate |
| 79 | * part of the tree and transforming it into a reflective object |
| 80 | * using a visitor. |
| 81 | * a visitor, which is created by feeding it the factory |
| 82 | * with which the repository was created. |
| 83 | */ |
| 84 | |
| 85 | public Type[] getParameterTypes(){ |
| 86 | if (paramTypes == null) { // lazily initialize parameter types |
| 87 | // first, extract parameter type subtree(s) from AST |
| 88 | TypeSignature[] pts = getTree().getParameterTypes(); |
| 89 | // create array to store reified subtree(s) |
| 90 | Type[] ps = new Type[pts.length]; |
| 91 | // reify all subtrees |
| 92 | for (int i = 0; i < pts.length; i++) { |
| 93 | Reifier r = getReifier(); // obtain visitor |
| 94 | pts[i].accept(r); // reify subtree |
| 95 | // extract result from visitor and store it |
| 96 | ps[i] = r.getResult(); |
| 97 | } |
| 98 | paramTypes = ps; // cache overall result |
| 99 | } |
| 100 | return paramTypes.clone(); // return cached result |
| 101 | } |
| 102 | |
| 103 | public Type[] getExceptionTypes(){ |
| 104 | if (exceptionTypes == null) { // lazily initialize exception types |
| 105 | // first, extract exception type subtree(s) from AST |
| 106 | FieldTypeSignature[] ets = getTree().getExceptionTypes(); |
| 107 | // create array to store reified subtree(s) |
| 108 | Type[] es = new Type[ets.length]; |
| 109 | // reify all subtrees |
| 110 | for (int i = 0; i < ets.length; i++) { |
| 111 | Reifier r = getReifier(); // obtain visitor |
| 112 | ets[i].accept(r); // reify subtree |
| 113 | // extract result from visitor and store it |
| 114 | es[i] = r.getResult(); |
| 115 | } |
| 116 | exceptionTypes = es; // cache overall result |
| 117 | } |
| 118 | return exceptionTypes.clone(); // return cached result |
| 119 | } |
| 120 | } |