1 /* 2 * Copyright (c) 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 java.beans; 27 28 import java.lang.ref.SoftReference; 29 import java.lang.ref.WeakReference; 30 import java.lang.reflect.Method; 31 32 import static sun.reflect.misc.ReflectUtil.isPackageAccessible; 33 34 final class MethodRef { 35 private String signature; 36 private SoftReference<Method> methodRef; 37 private WeakReference<Class<?>> typeRef; 38 39 void set(Method method) { 40 if (method == null) { 41 this.signature = null; 42 this.methodRef = null; 43 this.typeRef = null; 44 } 45 else { 46 this.signature = method.toGenericString(); 47 this.methodRef = new SoftReference<>(method); 48 this.typeRef = new WeakReference<Class<?>>(method.getDeclaringClass()); 49 } 50 } 51 52 boolean isSet() { 53 return this.methodRef != null; 54 } 55 56 Method get() { 57 if (this.methodRef == null) { 58 return null; 59 } 60 Method method = this.methodRef.get(); 61 if (method == null) { 62 method = find(this.typeRef.get(), this.signature); 63 if (method == null) { 64 this.signature = null; 65 this.methodRef = null; 66 this.typeRef = null; 67 } 68 else { 69 this.methodRef = new SoftReference<>(method); 70 } 71 } 72 return isPackageAccessible(method.getDeclaringClass()) ? method : null; 73 } 74 75 private static Method find(Class<?> type, String signature) { 76 if (type != null) { 77 for (Method method : type.getMethods()) { 78 if (type.equals(method.getDeclaringClass())) { 79 if (method.toGenericString().equals(signature)) { 80 return method; 81 } 82 } 83 } 84 } 85 return null; 86 } 87 }