| /* |
| * Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package com.sun.beans.finder; |
| |
| import com.sun.beans.TypeResolver; |
| import com.sun.beans.util.Cache; |
| |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Modifier; |
| import java.lang.reflect.ParameterizedType; |
| import java.lang.reflect.Type; |
| import java.util.Arrays; |
| |
| import static com.sun.beans.util.Cache.Kind.SOFT; |
| import static sun.reflect.misc.ReflectUtil.isPackageAccessible; |
| |
| /** |
| * This utility class provides {@code static} methods |
| * to find a public method with specified name and parameter types |
| * in specified class. |
| * |
| * @since 1.7 |
| * |
| * @author Sergey A. Malenkov |
| */ |
| public final class MethodFinder extends AbstractFinder<Method> { |
| private static final Cache<Signature, Method> CACHE = new Cache<Signature, Method>(SOFT, SOFT) { |
| @Override |
| public Method create(Signature signature) { |
| try { |
| MethodFinder finder = new MethodFinder(signature.getName(), signature.getArgs()); |
| return findAccessibleMethod(finder.find(signature.getType().getMethods())); |
| } |
| catch (Exception exception) { |
| throw new SignatureException(exception); |
| } |
| } |
| }; |
| |
| /** |
| * Finds public method (static or non-static) |
| * that is accessible from public class. |
| * |
| * @param type the class that can have method |
| * @param name the name of method to find |
| * @param args parameter types that is used to find method |
| * @return object that represents found method |
| * @throws NoSuchMethodException if method could not be found |
| * or some methods are found |
| */ |
| public static Method findMethod(Class<?> type, String name, Class<?>...args) throws NoSuchMethodException { |
| if (name == null) { |
| throw new IllegalArgumentException("Method name is not set"); |
| } |
| PrimitiveWrapperMap.replacePrimitivesWithWrappers(args); |
| Signature signature = new Signature(type, name, args); |
| |
| try { |
| Method method = CACHE.get(signature); |
| return (method == null) || isPackageAccessible(method.getDeclaringClass()) ? method : CACHE.create(signature); |
| } |
| catch (SignatureException exception) { |
| throw exception.toNoSuchMethodException("Method '" + name + "' is not found"); |
| } |
| } |
| |
| /** |
| * Finds public non-static method |
| * that is accessible from public class. |
| * |
| * @param type the class that can have method |
| * @param name the name of method to find |
| * @param args parameter types that is used to find method |
| * @return object that represents found method |
| * @throws NoSuchMethodException if method could not be found |
| * or some methods are found |
| */ |
| public static Method findInstanceMethod(Class<?> type, String name, Class<?>... args) throws NoSuchMethodException { |
| Method method = findMethod(type, name, args); |
| if (Modifier.isStatic(method.getModifiers())) { |
| throw new NoSuchMethodException("Method '" + name + "' is static"); |
| } |
| return method; |
| } |
| |
| /** |
| * Finds public static method |
| * that is accessible from public class. |
| * |
| * @param type the class that can have method |
| * @param name the name of method to find |
| * @param args parameter types that is used to find method |
| * @return object that represents found method |
| * @throws NoSuchMethodException if method could not be found |
| * or some methods are found |
| */ |
| public static Method findStaticMethod(Class<?> type, String name, Class<?>...args) throws NoSuchMethodException { |
| Method method = findMethod(type, name, args); |
| if (!Modifier.isStatic(method.getModifiers())) { |
| throw new NoSuchMethodException("Method '" + name + "' is not static"); |
| } |
| return method; |
| } |
| |
| /** |
| * Finds method that is accessible from public class or interface through class hierarchy. |
| * |
| * @param method object that represents found method |
| * @return object that represents accessible method |
| * @throws NoSuchMethodException if method is not accessible or is not found |
| * in specified superclass or interface |
| */ |
| public static Method findAccessibleMethod(Method method) throws NoSuchMethodException { |
| Class<?> type = method.getDeclaringClass(); |
| |
| if (!FinderUtils.isExported(type)) { |
| throw new NoSuchMethodException("Method '" + method.getName() + "' is not accessible"); |
| } |
| if (Modifier.isPublic(type.getModifiers()) && isPackageAccessible(type)) { |
| return method; |
| } |
| if (Modifier.isStatic(method.getModifiers())) { |
| throw new NoSuchMethodException("Method '" + method.getName() + "' is not accessible"); |
| } |
| for (Type generic : type.getGenericInterfaces()) { |
| try { |
| return findAccessibleMethod(method, generic); |
| } |
| catch (NoSuchMethodException exception) { |
| // try to find in superclass or another interface |
| } |
| } |
| return findAccessibleMethod(method, type.getGenericSuperclass()); |
| } |
| |
| /** |
| * Finds method that accessible from specified class. |
| * |
| * @param method object that represents found method |
| * @param generic generic type that is used to find accessible method |
| * @return object that represents accessible method |
| * @throws NoSuchMethodException if method is not accessible or is not found |
| * in specified superclass or interface |
| */ |
| private static Method findAccessibleMethod(Method method, Type generic) throws NoSuchMethodException { |
| String name = method.getName(); |
| Class<?>[] params = method.getParameterTypes(); |
| if (generic instanceof Class) { |
| Class<?> type = (Class<?>) generic; |
| return findAccessibleMethod(type.getMethod(name, params)); |
| } |
| if (generic instanceof ParameterizedType) { |
| ParameterizedType pt = (ParameterizedType) generic; |
| Class<?> type = (Class<?>) pt.getRawType(); |
| for (Method m : type.getMethods()) { |
| if (m.getName().equals(name)) { |
| Class<?>[] pts = m.getParameterTypes(); |
| if (pts.length == params.length) { |
| if (Arrays.equals(params, pts)) { |
| return findAccessibleMethod(m); |
| } |
| Type[] gpts = m.getGenericParameterTypes(); |
| if (params.length == gpts.length) { |
| if (Arrays.equals(params, TypeResolver.erase(TypeResolver.resolve(pt, gpts)))) { |
| return findAccessibleMethod(m); |
| } |
| } |
| } |
| } |
| } |
| } |
| throw new NoSuchMethodException("Method '" + name + "' is not accessible"); |
| } |
| |
| |
| private final String name; |
| |
| /** |
| * Creates method finder with specified array of parameter types. |
| * |
| * @param name the name of method to find |
| * @param args the array of parameter types |
| */ |
| private MethodFinder(String name, Class<?>[] args) { |
| super(args); |
| this.name = name; |
| } |
| |
| /** |
| * Checks validness of the method. |
| * The valid method should be public and |
| * should have the specified name. |
| * |
| * @param method the object that represents method |
| * @return {@code true} if the method is valid, |
| * {@code false} otherwise |
| */ |
| @Override |
| protected boolean isValid(Method method) { |
| return super.isValid(method) && method.getName().equals(this.name); |
| } |
| } |