1 /* 2 * Copyright (C) 2017 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.common.collect.Iterables.getOnlyElement; 20 import static javax.lang.model.type.TypeKind.VOID; 21 22 import com.squareup.javapoet.ClassName; 23 import com.squareup.javapoet.CodeBlock; 24 import com.squareup.javapoet.ParameterSpec; 25 import dagger.internal.codegen.ComponentDescriptor.ComponentMethodDescriptor; 26 import dagger.internal.codegen.javapoet.Expression; 27 import javax.lang.model.element.ExecutableElement; 28 29 /** 30 * A binding expression for members injection component methods. See {@link 31 * MembersInjectionMethods}. 32 */ 33 final class MembersInjectionBindingExpression extends BindingExpression { 34 private final MembersInjectionBinding binding; 35 private final MembersInjectionMethods membersInjectionMethods; 36 MembersInjectionBindingExpression( ResolvedBindings resolvedBindings, MembersInjectionMethods membersInjectionMethods)37 MembersInjectionBindingExpression( 38 ResolvedBindings resolvedBindings, MembersInjectionMethods membersInjectionMethods) { 39 this.binding = resolvedBindings.membersInjectionBinding().get(); 40 this.membersInjectionMethods = membersInjectionMethods; 41 } 42 43 @Override getDependencyExpression(ClassName requestingClass)44 Expression getDependencyExpression(ClassName requestingClass) { 45 throw new UnsupportedOperationException(binding.toString()); 46 } 47 48 // TODO(ronshapiro): This class doesn't need to be a BindingExpression, as 49 // getDependencyExpression() should never be called for members injection methods. It's probably 50 // better suited as a method on MembersInjectionMethods 51 @Override getComponentMethodImplementation( ComponentMethodDescriptor componentMethod, ComponentImplementation component)52 protected CodeBlock getComponentMethodImplementation( 53 ComponentMethodDescriptor componentMethod, ComponentImplementation component) { 54 ExecutableElement methodElement = componentMethod.methodElement(); 55 ParameterSpec parameter = ParameterSpec.get(getOnlyElement(methodElement.getParameters())); 56 57 if (binding.injectionSites().isEmpty()) { 58 return methodElement.getReturnType().getKind().equals(VOID) 59 ? CodeBlock.of("") 60 : CodeBlock.of("return $N;", parameter); 61 } else { 62 return methodElement.getReturnType().getKind().equals(VOID) 63 ? CodeBlock.of("$L;", membersInjectionInvocation(parameter)) 64 : CodeBlock.of("return $L;", membersInjectionInvocation(parameter)); 65 } 66 } 67 membersInjectionInvocation(ParameterSpec target)68 CodeBlock membersInjectionInvocation(ParameterSpec target) { 69 return CodeBlock.of("$N($N)", membersInjectionMethods.getOrCreate(binding.key()), target); 70 } 71 } 72