1 /* 2 * Copyright (C) 2015 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.codegen; 17 18 import com.google.common.base.Optional; 19 import com.google.common.collect.ImmutableSet; 20 import dagger.Module; 21 import dagger.Provides; 22 import dagger.internal.codegen.writer.ClassName; 23 import dagger.internal.codegen.writer.ClassWriter; 24 import dagger.internal.codegen.writer.FieldWriter; 25 import dagger.internal.codegen.writer.JavaWriter; 26 import dagger.internal.codegen.writer.MethodWriter; 27 import dagger.internal.codegen.writer.ParameterizedTypeName; 28 import dagger.internal.codegen.writer.TypeName; 29 import dagger.producers.monitoring.ProductionComponentMonitor; 30 import dagger.producers.monitoring.internal.MonitorCache; 31 32 import java.util.Set; 33 import javax.annotation.Generated; 34 import javax.annotation.processing.Filer; 35 import javax.inject.Provider; 36 import javax.lang.model.element.Element; 37 import javax.lang.model.element.TypeElement; 38 39 import static javax.lang.model.element.Modifier.PRIVATE; 40 import static javax.lang.model.element.Modifier.STATIC; 41 import static javax.lang.model.element.Modifier.FINAL; 42 43 /** Generates a monitoring module for use with production components. */ 44 final class MonitoringModuleGenerator extends SourceFileGenerator<TypeElement> { 45 private static final TypeName SET_OF_FACTORIES = 46 ParameterizedTypeName.create( 47 Set.class, ClassName.fromClass(ProductionComponentMonitor.Factory.class)); 48 49 MonitoringModuleGenerator(Filer filer) { 50 super(filer); 51 } 52 53 @Override 54 ClassName nameGeneratedType(TypeElement componentElement) { 55 return SourceFiles.generatedMonitoringModuleName(componentElement); 56 } 57 58 @Override 59 Iterable<? extends Element> getOriginatingElements(TypeElement componentElement) { 60 return ImmutableSet.of(componentElement); 61 } 62 63 @Override 64 Optional<? extends Element> getElementForErrorReporting(TypeElement componentElement) { 65 return Optional.of(componentElement); 66 } 67 68 @Override 69 ImmutableSet<JavaWriter> write(ClassName generatedTypeName, TypeElement componentElement) { 70 JavaWriter writer = JavaWriter.inPackage(generatedTypeName.packageName()); 71 ClassWriter classWriter = writer.addClass(generatedTypeName.simpleName()); 72 classWriter.annotate(Generated.class).setValue(ComponentProcessor.class.getName()); 73 classWriter.annotate(Module.class); 74 classWriter.addModifiers(FINAL); 75 76 // TODO(beder): Replace this default set binding with EmptyCollections when it exists. 77 MethodWriter emptySetBindingMethod = 78 classWriter.addMethod(SET_OF_FACTORIES, "defaultSetOfFactories"); 79 emptySetBindingMethod.addModifiers(STATIC); 80 emptySetBindingMethod.annotate(Provides.class).setMember("type", Provides.Type.SET_VALUES); 81 emptySetBindingMethod 82 .body() 83 .addSnippet("return %s.of();", ClassName.fromClass(ImmutableSet.class)); 84 85 FieldWriter providerField = classWriter.addField(MonitorCache.class, "monitorCache"); 86 providerField.addModifiers(PRIVATE, FINAL); 87 providerField.setInitializer("new %s()", ClassName.fromClass(MonitorCache.class)); 88 MethodWriter monitorMethod = classWriter.addMethod(ProductionComponentMonitor.class, "monitor"); 89 monitorMethod.annotate(Provides.class); 90 monitorMethod.addParameter( 91 ParameterizedTypeName.create(Provider.class, ClassName.fromTypeElement(componentElement)), 92 "component"); 93 monitorMethod.addParameter( 94 ParameterizedTypeName.create(Provider.class, SET_OF_FACTORIES), "factories"); 95 monitorMethod.body().addSnippet("return monitorCache.monitor(component, factories);"); 96 97 return ImmutableSet.of(writer); 98 } 99 } 100
