1 /* 2 * Copyright (C) 2009 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 signature.model.impl; 18 19 import java.lang.reflect.InvocationHandler; 20 import java.lang.reflect.Method; 21 import java.lang.reflect.Proxy; 22 import java.util.List; 23 import java.util.Set; 24 25 import signature.model.IAnnotationField; 26 import signature.model.IClassDefinition; 27 import signature.model.IClassReference; 28 import signature.model.IPackage; 29 import signature.model.ITypeReference; 30 import signature.model.ITypeVariableDefinition; 31 import signature.model.ITypeVariableReference; 32 import signature.model.Kind; 33 34 /** 35 * 36 */ 37 public class Uninitialized { 38 39 private static final Object UNINITIALIZED; 40 41 static { 42 UNINITIALIZED = Proxy.newProxyInstance(Uninitialized.class 43 .getClassLoader(), new Class[] { 44 ITypeReference.class, IPackage.class, IClassDefinition.class, 45 IClassReference.class, ITypeVariableReference.class, 46 ITypeVariableDefinition.class, IAnnotationField.class, 47 Set.class, List.class}, new InvocationHandler() { 48 public Object invoke(Object proxy, Method method, Object[] args) 49 throws Throwable { 50 if (method.getName().equals("toString")) { 51 return "Uninitialized"; 52 } 53 54 throw new UnsupportedOperationException(); 55 } 56 }); 57 } 58 59 @SuppressWarnings("unchecked") unset()60 public static <T> T unset() { 61 return (T) UNINITIALIZED; 62 } 63 isInitialized(Object o)64 public static boolean isInitialized(Object o) { 65 return o != UNINITIALIZED && o != Kind.UNINITIALIZED; 66 } 67 } 68