1 /** 2 * Copyright (C) 2008 Google Inc. 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.google.inject.internal; 18 19 import com.google.common.base.Objects; 20 import com.google.inject.Key; 21 import com.google.inject.internal.InjectorImpl.JitLimitation; 22 import com.google.inject.spi.Dependency; 23 24 /** 25 * A placeholder which enables us to swap in the real factory once the injector is created. 26 * Used for a linked binding, so that getting the linked binding returns the link's factory. 27 */ 28 final class FactoryProxy<T> implements InternalFactory<T>, CreationListener { 29 30 private final InjectorImpl injector; 31 private final Key<T> key; 32 private final Key<? extends T> targetKey; 33 private final Object source; 34 35 private InternalFactory<? extends T> targetFactory; 36 37 FactoryProxy(InjectorImpl injector, Key<T> key, Key<? extends T> targetKey, Object source) { 38 this.injector = injector; 39 this.key = key; 40 this.targetKey = targetKey; 41 this.source = source; 42 } 43 44 public void notify(final Errors errors) { 45 try { 46 targetFactory = injector.getInternalFactory(targetKey, errors.withSource(source), JitLimitation.NEW_OR_EXISTING_JIT); 47 } catch (ErrorsException e) { 48 errors.merge(e.getErrors()); 49 } 50 } 51 52 public T get(Errors errors, InternalContext context, Dependency<?> dependency, boolean linked) 53 throws ErrorsException { 54 context.pushState(targetKey, source); 55 try { 56 return targetFactory.get(errors.withSource(targetKey), context, dependency, true); 57 } finally { 58 context.popState(); 59 } 60 } 61 62 @Override public String toString() { 63 return Objects.toStringHelper(FactoryProxy.class) 64 .add("key", key) 65 .add("provider", targetFactory) 66 .toString(); 67 } 68 } 69
