1 /* 2 * Copyright (C) 2014 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 package dagger.internal; 17 18 import javax.inject.Provider; 19 20 /** 21 * A DelegateFactory that is used to stitch Provider/Lazy indirection based dependency cycles. 22 * 23 * @since 2.0.1 24 */ 25 public final class DelegateFactory<T> implements Factory<T> { 26 private Provider<T> delegate; 27 28 @Override 29 public T get() { 30 if (delegate == null) { 31 throw new IllegalStateException(); 32 } 33 return delegate.get(); 34 } 35 36 public void setDelegatedProvider(Provider<T> delegate) { 37 if (delegate == null) { 38 throw new IllegalArgumentException(); 39 } 40 if (this.delegate != null) { 41 throw new IllegalStateException(); 42 } 43 this.delegate = delegate; 44 } 45 } 46 47
