| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.layoutlib.bridge.util; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| |
| import java.lang.reflect.InvocationHandler; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Proxy; |
| |
| /** |
| * Utility to convert checked Reflection exceptions to unchecked exceptions. |
| */ |
| public class ReflectionUtils { |
| |
| @NonNull |
| public static Method getMethod(@NonNull Class<?> clazz, @NonNull String name, |
| @Nullable Class<?>... params) throws ReflectionException { |
| try { |
| return clazz.getMethod(name, params); |
| } catch (NoSuchMethodException e) { |
| throw new ReflectionException(e); |
| } |
| } |
| |
| @NonNull |
| public static Method getAccessibleMethod(@NonNull Class<?> clazz, @NonNull String name, |
| @Nullable Class<?>... params) throws ReflectionException { |
| Method method = getMethod(clazz, name, params); |
| method.setAccessible(true); |
| |
| return method; |
| } |
| |
| @Nullable |
| public static Object invoke(@NonNull Method method, @Nullable Object object, |
| @Nullable Object... args) throws ReflectionException { |
| Exception ex; |
| try { |
| return method.invoke(object, args); |
| } catch (IllegalAccessException | InvocationTargetException e) { |
| ex = e; |
| } |
| throw new ReflectionException(ex); |
| } |
| |
| /** |
| * Check if the object is an instance of a class named {@code className}. This doesn't work |
| * for interfaces. |
| */ |
| public static boolean isInstanceOf(Object object, String className) { |
| Class superClass = object.getClass(); |
| while (superClass != null) { |
| String name = superClass.getName(); |
| if (name.equals(className)) { |
| return true; |
| } |
| superClass = superClass.getSuperclass(); |
| } |
| return false; |
| } |
| |
| /** |
| * Check if the object is an instance of a class named {@code className}. This doesn't work |
| * for interfaces. |
| */ |
| public static boolean isInstanceOf(Object object, String[] classNames) { |
| return getParentClass(object, classNames) != null; |
| } |
| |
| /** |
| * Check if the object is an instance of any of the class named in {@code className} and |
| * returns the name of the parent class that matched. This doesn't work for interfaces. |
| */ |
| @Nullable |
| public static String getParentClass(Object object, String[] classNames) { |
| Class superClass = object.getClass(); |
| while (superClass != null) { |
| String name = superClass.getName(); |
| for (String className : classNames) { |
| if (name.equals(className)) { |
| return className; |
| } |
| } |
| superClass = superClass.getSuperclass(); |
| } |
| return null; |
| } |
| |
| @NonNull |
| public static Throwable getCause(@NonNull Throwable throwable) { |
| Throwable cause = throwable.getCause(); |
| return cause == null ? throwable : cause; |
| } |
| |
| /** |
| * Looks through the class hierarchy of {@code object} at runtime and returns the class matching |
| * the name {@code className}. |
| * <p> |
| * This is used when we cannot use Class.forName() since the class we want was loaded from a |
| * different ClassLoader. |
| */ |
| @NonNull |
| public static Class<?> getClassInstance(@NonNull Object object, @NonNull String className) { |
| Class<?> superClass = object.getClass(); |
| while (superClass != null) { |
| if (className.equals(superClass.getName())) { |
| return superClass; |
| } |
| superClass = superClass.getSuperclass(); |
| } |
| throw new RuntimeException("invalid object/classname combination."); |
| } |
| |
| public static <T> T createProxy(Class<T> interfaze) { |
| ClassLoader loader = interfaze.getClassLoader(); |
| return (T) Proxy.newProxyInstance(loader, new Class[]{interfaze}, new InvocationHandler() { |
| public Object invoke(Object proxy, Method m, Object[] args) { |
| final Class<?> returnType = m.getReturnType(); |
| if (returnType == boolean.class) { |
| return false; |
| } else if (returnType == int.class) { |
| return 0; |
| } else if (returnType == long.class) { |
| return 0L; |
| } else if (returnType == short.class) { |
| return 0; |
| } else if (returnType == char.class) { |
| return 0; |
| } else if (returnType == byte.class) { |
| return 0; |
| } else if (returnType == float.class) { |
| return 0f; |
| } else if (returnType == double.class) { |
| return 0.0; |
| } else { |
| return null; |
| } |
| } |
| }); |
| } |
| |
| /** |
| * Wraps all reflection related exceptions. Created since ReflectiveOperationException was |
| * introduced in 1.7 and we are still on 1.6 |
| */ |
| public static class ReflectionException extends Exception { |
| public ReflectionException() { |
| super(); |
| } |
| |
| public ReflectionException(String message) { |
| super(message); |
| } |
| |
| public ReflectionException(String message, Throwable cause) { |
| super(message, cause); |
| } |
| |
| public ReflectionException(Throwable cause) { |
| super(cause); |
| } |
| } |
| } |