1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.layoutlib.bridge.util; 18 19 import android.annotation.NonNull; 20 import android.annotation.Nullable; 21 22 import java.lang.reflect.InvocationTargetException; 23 import java.lang.reflect.Method; 24 25 /** 26 * Utility to convert checked Reflection exceptions to unchecked exceptions. 27 */ 28 public class ReflectionUtils { 29 30 @NonNull getMethod(@onNull Class<?> clazz, @NonNull String name, @Nullable Class<?>... params)31 public static Method getMethod(@NonNull Class<?> clazz, @NonNull String name, 32 @Nullable Class<?>... params) throws ReflectionException { 33 try { 34 return clazz.getMethod(name, params); 35 } catch (NoSuchMethodException e) { 36 throw new ReflectionException(e); 37 } 38 } 39 40 @Nullable invoke(@onNull Method method, @Nullable Object object, @Nullable Object... args)41 public static Object invoke(@NonNull Method method, @Nullable Object object, 42 @Nullable Object... args) throws ReflectionException { 43 Exception ex; 44 try { 45 return method.invoke(object, args); 46 } catch (IllegalAccessException e) { 47 ex = e; 48 } catch (InvocationTargetException e) { 49 ex = e; 50 } 51 throw new ReflectionException(ex); 52 } 53 54 /** 55 * Check if the object is an instance of a class named {@code className}. This doesn't work 56 * for interfaces. 57 */ isInstanceOf(Object object, String className)58 public static boolean isInstanceOf(Object object, String className) { 59 Class superClass = object.getClass(); 60 while (superClass != null) { 61 String name = superClass.getName(); 62 if (name.equals(className)) { 63 return true; 64 } 65 superClass = superClass.getSuperclass(); 66 } 67 return false; 68 } 69 70 @NonNull getCause(@onNull Throwable throwable)71 public static Throwable getCause(@NonNull Throwable throwable) { 72 Throwable cause = throwable.getCause(); 73 return cause == null ? throwable : cause; 74 } 75 76 /** 77 * Wraps all reflection related exceptions. Created since ReflectiveOperationException was 78 * introduced in 1.7 and we are still on 1.6 79 */ 80 public static class ReflectionException extends Exception { ReflectionException()81 public ReflectionException() { 82 super(); 83 } 84 ReflectionException(String message)85 public ReflectionException(String message) { 86 super(message); 87 } 88 ReflectionException(String message, Throwable cause)89 public ReflectionException(String message, Throwable cause) { 90 super(message, cause); 91 } 92 ReflectionException(Throwable cause)93 public ReflectionException(Throwable cause) { 94 super(cause); 95 } 96 } 97 } 98