1 /* 2 * Copyright (C) 2018 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 import java.lang.invoke.MethodHandles; 18 import java.lang.invoke.MethodType; 19 20 /** Class with helper methods for field and method lookups using java.lang.invoke. */ 21 public class JLI { 22 public static boolean canDiscoverWithLookupFindGetter( 23 MethodHandles.Lookup lookup, Class<?> klass, String fieldName, Class<?> fieldType) { 24 try { 25 return lookup.findGetter(klass, fieldName, fieldType) != null; 26 } catch (NoSuchFieldException e) { 27 return false; 28 } catch (IllegalAccessException e) { 29 return true; 30 } 31 } 32 33 public static boolean canDiscoverWithLookupFindSetter( 34 MethodHandles.Lookup lookup, Class<?> klass, String fieldName, Class<?> fieldType) { 35 try { 36 return lookup.findSetter(klass, fieldName, fieldType) != null; 37 } catch (NoSuchFieldException e) { 38 return false; 39 } catch (IllegalAccessException e) { 40 return true; 41 } 42 } 43 44 public static boolean canDiscoverWithLookupFindStaticGetter( 45 MethodHandles.Lookup lookup, Class<?> klass, String fieldName, Class<?> fieldType) { 46 try { 47 return lookup.findStaticGetter(klass, fieldName, fieldType) != null; 48 } catch (NoSuchFieldException e) { 49 return false; 50 } catch (IllegalAccessException e) { 51 return true; 52 } 53 } 54 55 public static boolean canDiscoverWithLookupFindStaticSetter( 56 MethodHandles.Lookup lookup, Class<?> klass, String fieldName, Class<?> fieldType) { 57 try { 58 return lookup.findStaticSetter(klass, fieldName, fieldType) != null; 59 } catch (NoSuchFieldException e) { 60 return false; 61 } catch (IllegalAccessException e) { 62 return true; 63 } 64 } 65 66 public static boolean canDiscoverWithLookupFindConstructor( 67 MethodHandles.Lookup lookup, Class<?> klass, MethodType methodType) { 68 try { 69 return lookup.findConstructor(klass, methodType) != null; 70 } catch (NoSuchMethodException e) { 71 return false; 72 } catch (IllegalAccessException e) { 73 return true; 74 } 75 } 76 77 public static boolean canDiscoverWithLookupFindVirtual( 78 MethodHandles.Lookup lookup, Class<?> klass, String methodName, MethodType methodType) { 79 try { 80 return lookup.findVirtual(klass, methodName, methodType) != null; 81 } catch (NoSuchMethodException e) { 82 return false; 83 } catch (IllegalAccessException e) { 84 return true; 85 } 86 } 87 88 public static boolean canDiscoverWithLookupFindStatic( 89 MethodHandles.Lookup lookup, Class<?> klass, String methodName, MethodType methodType) { 90 try { 91 return lookup.findStatic(klass, methodName, methodType) != null; 92 } catch (NoSuchMethodException e) { 93 return false; 94 } catch (IllegalAccessException e) { 95 return true; 96 } 97 } 98 } 99
