1 /* 2 * Copyright (C) 2016 The Dagger Authors. 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 dagger.internal.codegen; 18 19 import static com.google.auto.common.MoreElements.isAnnotationPresent; 20 import static com.google.common.base.Preconditions.checkArgument; 21 22 import com.google.auto.value.AutoValue; 23 import com.google.auto.value.extension.memoized.Memoized; 24 import dagger.BindsOptionalOf; 25 import dagger.model.Key; 26 import java.util.Optional; 27 import javax.inject.Inject; 28 import javax.lang.model.element.Element; 29 import javax.lang.model.element.ExecutableElement; 30 import javax.lang.model.element.TypeElement; 31 32 /** A {@link BindsOptionalOf} declaration. */ 33 @AutoValue 34 abstract class OptionalBindingDeclaration extends BindingDeclaration { 35 36 /** 37 * {@inheritDoc} 38 * 39 * <p>The key's type is the method's return type, even though the synthetic bindings will be for 40 * {@code Optional} of derived types. 41 */ 42 @Override key()43 public abstract Key key(); 44 45 @Memoized 46 @Override hashCode()47 public abstract int hashCode(); 48 49 @Override equals(Object obj)50 public abstract boolean equals(Object obj); 51 52 static class Factory { 53 private final KeyFactory keyFactory; 54 55 @Inject Factory(KeyFactory keyFactory)56 Factory(KeyFactory keyFactory) { 57 this.keyFactory = keyFactory; 58 } 59 forMethod(ExecutableElement method, TypeElement contributingModule)60 OptionalBindingDeclaration forMethod(ExecutableElement method, TypeElement contributingModule) { 61 checkArgument(isAnnotationPresent(method, BindsOptionalOf.class)); 62 return new AutoValue_OptionalBindingDeclaration( 63 Optional.<Element>of(method), 64 Optional.of(contributingModule), 65 keyFactory.forBindsOptionalOfMethod(method, contributingModule)); 66 } 67 } 68 } 69