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 * Copyright (c) 2013, 2016, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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 */

package java.beans;

import java.lang.ref.SoftReference;
import java.lang.ref.WeakReference;
import java.lang.reflect.Method;

import static sun.reflect.misc.ReflectUtil.isPackageAccessible;

final class MethodRef {
 private String signature;
 private SoftReference<Method> methodRef;
 private WeakReference<Class<?>> typeRef;

 void set(Method method) {
 if (method == null) {
 this.signature = null;
 this.methodRef = null;
 this.typeRef = null;
 }
 else {
 this.signature = method.toGenericString();
 this.methodRef = new SoftReference<>(method);
 this.typeRef = new WeakReference<Class<?>>(method.getDeclaringClass());
 }
 }

 boolean isSet() {
 return this.methodRef != null;
 }

 Method get() {
 if (this.methodRef == null) {
 return null;
 }
 Method method = this.methodRef.get();
 if (method == null) {
 method = find(this.typeRef.get(), this.signature);
 if (method == null) {
 this.signature = null;
 this.methodRef = null;
 this.typeRef = null;
 return null;
 }
 this.methodRef = new SoftReference<>(method);
 }
 return isPackageAccessible(method.getDeclaringClass()) ? method : null;
 }

 private static Method find(Class<?> type, String signature) {
 if (type != null) {
 for (Method method : type.getMethods()) {
 if (type.equals(method.getDeclaringClass())) {
 if (method.toGenericString().equals(signature)) {
 return method;
 }
 }
 }
 }
 return null;
 }
}