author | malenkov |
Mon, 15 Oct 2012 19:00:13 +0400 | |
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parent 13601 | a620e6a185a4 |
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/* |
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* Copyright (c) 2008, 2012, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package com.sun.beans.finder; |
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import com.sun.beans.TypeResolver; |
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import com.sun.beans.WeakCache; |
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import java.lang.reflect.Method; |
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import java.lang.reflect.Modifier; |
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import java.lang.reflect.ParameterizedType; |
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import java.lang.reflect.Type; |
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import java.util.Arrays; |
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import static sun.reflect.misc.ReflectUtil.isPackageAccessible; |
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/** |
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* This utility class provides {@code static} methods |
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* to find a public method with specified name and parameter types |
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* in specified class. |
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* |
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* @since 1.7 |
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* |
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* @author Sergey A. Malenkov |
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*/ |
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public final class MethodFinder extends AbstractFinder<Method> { |
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private static final WeakCache<Signature, Method> CACHE = new WeakCache<Signature, Method>(); |
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/** |
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* Finds public method (static or non-static) |
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* that is accessible from public class. |
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* |
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* @param type the class that can have method |
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* @param name the name of method to find |
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* @param args parameter types that is used to find method |
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* @return object that represents found method |
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* @throws NoSuchMethodException if method could not be found |
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* or some methods are found |
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*/ |
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public static Method findMethod(Class<?> type, String name, Class<?>...args) throws NoSuchMethodException { |
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if (name == null) { |
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throw new IllegalArgumentException("Method name is not set"); |
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} |
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PrimitiveWrapperMap.replacePrimitivesWithWrappers(args); |
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Signature signature = new Signature(type, name, args); |
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Method method = CACHE.get(signature); |
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boolean cached = method != null; |
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if (cached && isPackageAccessible(method.getDeclaringClass())) { |
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return method; |
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} |
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method = findAccessibleMethod(new MethodFinder(name, args).find(type.getMethods())); |
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if (!cached) { |
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CACHE.put(signature, method); |
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} |
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return method; |
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} |
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/** |
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* Finds public non-static method |
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* that is accessible from public class. |
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* |
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* @param type the class that can have method |
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* @param name the name of method to find |
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* @param args parameter types that is used to find method |
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* @return object that represents found method |
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* @throws NoSuchMethodException if method could not be found |
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* or some methods are found |
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*/ |
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public static Method findInstanceMethod(Class<?> type, String name, Class<?>... args) throws NoSuchMethodException { |
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Method method = findMethod(type, name, args); |
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if (Modifier.isStatic(method.getModifiers())) { |
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throw new NoSuchMethodException("Method '" + name + "' is static"); |
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} |
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return method; |
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} |
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/** |
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* Finds public static method |
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* that is accessible from public class. |
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* |
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* @param type the class that can have method |
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* @param name the name of method to find |
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* @param args parameter types that is used to find method |
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* @return object that represents found method |
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* @throws NoSuchMethodException if method could not be found |
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* or some methods are found |
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*/ |
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public static Method findStaticMethod(Class<?> type, String name, Class<?>...args) throws NoSuchMethodException { |
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Method method = findMethod(type, name, args); |
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if (!Modifier.isStatic(method.getModifiers())) { |
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throw new NoSuchMethodException("Method '" + name + "' is not static"); |
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} |
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return method; |
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} |
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/** |
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* Finds method that is accessible from public class or interface through class hierarchy. |
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* |
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* @param method object that represents found method |
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* @return object that represents accessible method |
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* @throws NoSuchMethodException if method is not accessible or is not found |
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* in specified superclass or interface |
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*/ |
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public static Method findAccessibleMethod(Method method) throws NoSuchMethodException { |
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Class<?> type = method.getDeclaringClass(); |
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if (Modifier.isPublic(type.getModifiers()) && isPackageAccessible(type)) { |
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return method; |
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} |
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if (Modifier.isStatic(method.getModifiers())) { |
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throw new NoSuchMethodException("Method '" + method.getName() + "' is not accessible"); |
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} |
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for (Type generic : type.getGenericInterfaces()) { |
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try { |
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return findAccessibleMethod(method, generic); |
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} |
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catch (NoSuchMethodException exception) { |
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// try to find in superclass or another interface |
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} |
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} |
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return findAccessibleMethod(method, type.getGenericSuperclass()); |
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} |
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/** |
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* Finds method that accessible from specified class. |
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* |
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* @param method object that represents found method |
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* @param generic generic type that is used to find accessible method |
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* @return object that represents accessible method |
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* @throws NoSuchMethodException if method is not accessible or is not found |
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* in specified superclass or interface |
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*/ |
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private static Method findAccessibleMethod(Method method, Type generic) throws NoSuchMethodException { |
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String name = method.getName(); |
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Class<?>[] params = method.getParameterTypes(); |
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if (generic instanceof Class) { |
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Class<?> type = (Class<?>) generic; |
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return findAccessibleMethod(type.getMethod(name, params)); |
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} |
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if (generic instanceof ParameterizedType) { |
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ParameterizedType pt = (ParameterizedType) generic; |
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Class<?> type = (Class<?>) pt.getRawType(); |
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for (Method m : type.getMethods()) { |
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if (m.getName().equals(name)) { |
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Class<?>[] pts = m.getParameterTypes(); |
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if (pts.length == params.length) { |
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if (Arrays.equals(params, pts)) { |
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return findAccessibleMethod(m); |
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} |
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Type[] gpts = m.getGenericParameterTypes(); |
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if (params.length == gpts.length) { |
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if (Arrays.equals(params, TypeResolver.erase(TypeResolver.resolve(pt, gpts)))) { |
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return findAccessibleMethod(m); |
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} |
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} |
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} |
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} |
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} |
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} |
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throw new NoSuchMethodException("Method '" + name + "' is not accessible"); |
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} |
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private final String name; |
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/** |
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* Creates method finder with specified array of parameter types. |
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* |
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* @param name the name of method to find |
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* @param args the array of parameter types |
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*/ |
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private MethodFinder(String name, Class<?>[] args) { |
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super(args); |
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this.name = name; |
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} |
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/** |
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* Returns an array of {@code Class} objects |
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* that represent the formal parameter types of the method. |
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* Returns an empty array if the method takes no parameters. |
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* |
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* @param method the object that represents method |
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* @return the parameter types of the method |
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*/ |
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@Override |
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protected Class<?>[] getParameters(Method method) { |
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return method.getParameterTypes(); |
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} |
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/** |
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* Returns {@code true} if and only if the method |
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* was declared to take a variable number of arguments. |
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* |
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* @param method the object that represents method |
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* @return {@code true} if the method was declared |
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* to take a variable number of arguments; |
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* {@code false} otherwise |
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*/ |
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@Override |
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protected boolean isVarArgs(Method method) { |
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return method.isVarArgs(); |
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} |
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/** |
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* Checks validness of the method. |
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* The valid method should be public and |
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* should have the specified name. |
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* |
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* @param method the object that represents method |
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* @return {@code true} if the method is valid, |
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* {@code false} otherwise |
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*/ |
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@Override |
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protected boolean isValid(Method method) { |
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return !method.isBridge() && Modifier.isPublic(method.getModifiers()) && method.getName().equals(this.name); |
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} |
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} |