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Annotation Processing Jake Wharton Boilerplate Destruction!

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Annotation Processing Jake Wharton Boilerplate Destruction!

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JSR 269

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JSR 269 • 6 months after Java 5 released

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JSR 269 • 6 months after Java 5 released • “Pluggable Annotation Processing API”

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JSR 269 • 6 months after Java 5 released • “Pluggable Annotation Processing API” • Preceded by doclet and apt standalone tools

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JSR 269 • 6 months after Java 5 released • “Pluggable Annotation Processing API” • Preceded by doclet and apt standalone tools • Google, Oracle, Sun, BEA Systems sponsored

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JSR 269 • 6 months after Java 5 released • “Pluggable Annotation Processing API” • Preceded by doclet and apt standalone tools • Google, Oracle, Sun, BEA Systems sponsored • Simplify and standardize processing annotations

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JSR 269 • 6 months after Java 5 released • “Pluggable Annotation Processing API” • Preceded by doclet and apt standalone tools • Google, Oracle, Sun, BEA Systems sponsored • Simplify and standardize processing annotations • No standalone tool, part of javac

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AutoValue @AutoValue
 abstract class Animal {
 static Animal create(String name, int numberOfLegs) {
 return new AutoValue_Animal(name, numberOfLegs);
 } 
 abstract String name();
 abstract int numberOfLegs();
 } github.com/google/auto/

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AutoValue github.com/google/auto/ final class AutoValue_Animal extends Animal {
 private final String name;
 private final int numberOfLegs;
 
 AutoValue_Animal(
 String name,
 int numberOfLegs) {
 if (name == null) {
 throw new NullPointerException("Null name");
 }
 this.name = name;
 this.numberOfLegs = numberOfLegs;
 }
 
 @Override
 String name() {
 return name;
 }
 
 @Override
 int numberOfLegs() {
 return numberOfLegs;
 }
 
 @Override
 public String toString() {
 return "Animal{"
 + "name=" + name
 + ", numberOfLegs=" + numberOfLegs
 + "}";
 }
 
 @Override
 public boolean equals(Object o) {
 if (o == this) {
 return true;
 }
 if (o instanceof Animal) {
 Animal that = (Animal) o;
 return (this.name.equals(that.name()))
 && (this.numberOfLegs == that.numberOfLegs());
 }
 return false;
 }
 
 @Override
 public int hashCode() {
 int h = 1;
 h *= 1000003;
 h ^= name.hashCode();
 h *= 1000003;
 h ^= numberOfLegs;
 return h;
 }
 }

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AutoValue github.com/google/auto/ final class AutoValue_Animal extends Animal {
 private final String name;
 private final int numberOfLegs;
 
 AutoValue_Animal(
 String name,
 int numberOfLegs) {
 if (name == null) {
 throw new NullPointerException("Null name");
 }
 this.name = name;
 this.numberOfLegs = numberOfLegs;
 }
 
 @Override
 String name() {
 return name;
 }
 
 @Override
 int numberOfLegs() {
 return numberOfLegs;
 }
 
 @Override
 public String toString() {
 return "Animal{"
 + "name=" + name
 + ", numberOfLegs=" + numberOfLegs
 + "}";
 }
 
 @Override
 public boolean equals(Object o) {
 if (o == this) {
 return true;
 }
 if (o instanceof Animal) {
 Animal that = (Animal) o;
 return (this.name.equals(that.name()))
 && (this.numberOfLegs == that.numberOfLegs());
 }
 return false;
 }
 
 @Override
 public int hashCode() {
 int h = 1;
 h *= 1000003;
 h ^= name.hashCode();
 h *= 1000003;
 h ^= numberOfLegs;
 return h;
 }
 } Final fields Constructor Getters .toString() .equals() .hashCode()

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AutoParcel github.com/frankiesardo/auto-parcel/ @AutoParcel
 abstract class Animal implements Parcelable {
 static Animal create(String name, int numberOfLegs) {
 return new AutoParcel_Animal(name, numberOfLegs);
 } 
 abstract String name();
 abstract int numberOfLegs();
 }

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AutoParcel github.com/frankiesardo/auto-parcel/ @AutoParcel
 abstract class Animal implements Parcelable {
 static Animal create(String name, int numberOfLegs) {
 return new AutoParcel_Animal(name, numberOfLegs);
 } 
 abstract String name();
 abstract int numberOfLegs();
 }

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AutoParcel final class AutoParcel_Animal extends Animal {
 private final String name;
 private final int numberOfLegs;
 
 AutoParcel_Animal(
 String name,
 int numberOfLegs) {
 if (name == null) {
 throw new NullPointerException("Null name");
 }
 this.name = name;
 this.numberOfLegs = numberOfLegs;
 }
 
 @Override
 String name() {
 return name;
 }
 
 @Override
 int numberOfLegs() {
 return numberOfLegs;
 }
 
 @Override
 public String toString() {
 return "Animal{"
 + "name=" + name
 + ", numberOfLegs=" + numberOfLegs
 + "}";
 }
 
 @Override
 public boolean equals(Object o) {
 if (o == this) {
 return true;
 }
 if (o instanceof Animal) {
 Animal that = (Animal) o;
 return (this.name.equals(that.name()))
 && (this.numberOfLegs == that.numberOfLegs());
 }
 return false;
 }
 
 @Override
 public int hashCode() {
 int h = 1;
 h *= 1000003;
 h ^= name.hashCode();
 h *= 1000003;
 h ^= numberOfLegs;
 return h;
 }
 
 public static final Parcelable.Creator CREATOR = new Parcelable.Creator() {
 @Override public Animal createFromParcel(Parcel in) {
 return new AutoParcel_Animal(in);
 }
 @Override public Animal[] newArray(int size) {
 return new Animal[size];
 }
 };
 
 private final static ClassLoader CL = AutoParcel_Animal.class.getClassLoader();
 
 private AutoParcel_Animal(Parcel in) {
 this(
 (String) in.readValue(CL),
 (Integer) in.readValue(CL));
 }
 
 @Override public void writeToParcel(Parcel dest, int flags) {
 dest.writeValue(name);
 dest.writeValue(numberOfLegs);
 }
 
 @Override public int describeContents() {
 return 0;
 }
 } github.com/frankiesardo/auto-parcel/

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AutoParcel final class AutoParcel_Animal extends Animal {
 private final String name;
 private final int numberOfLegs;
 
 AutoParcel_Animal(
 String name,
 int numberOfLegs) {
 if (name == null) {
 throw new NullPointerException("Null name");
 }
 this.name = name;
 this.numberOfLegs = numberOfLegs;
 }
 
 @Override
 String name() {
 return name;
 }
 
 @Override
 int numberOfLegs() {
 return numberOfLegs;
 }
 
 @Override
 public String toString() {
 return "Animal{"
 + "name=" + name
 + ", numberOfLegs=" + numberOfLegs
 + "}";
 }
 
 @Override
 public boolean equals(Object o) {
 if (o == this) {
 return true;
 }
 if (o instanceof Animal) {
 Animal that = (Animal) o;
 return (this.name.equals(that.name()))
 && (this.numberOfLegs == that.numberOfLegs());
 }
 return false;
 }
 
 @Override
 public int hashCode() {
 int h = 1;
 h *= 1000003;
 h ^= name.hashCode();
 h *= 1000003;
 h ^= numberOfLegs;
 return h;
 }
 
 public static final Parcelable.Creator CREATOR = new Parcelable.Creator() {
 @Override public Animal createFromParcel(Parcel in) {
 return new AutoParcel_Animal(in);
 }
 @Override public Animal[] newArray(int size) {
 return new Animal[size];
 }
 };
 
 private final static ClassLoader CL = AutoParcel_Animal.class.getClassLoader();
 
 private AutoParcel_Animal(Parcel in) {
 this(
 (String) in.readValue(CL),
 (Integer) in.readValue(CL));
 }
 
 @Override public void writeToParcel(Parcel dest, int flags) {
 dest.writeValue(name);
 dest.writeValue(numberOfLegs);
 }
 
 @Override public int describeContents() {
 return 0;
 }
 } Final fields Constructor Getters .toString() .equals() .hashCode() github.com/frankiesardo/auto-parcel/ CREATOR Parcel constructor Parcel writer

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Butter Knife class SimpleActivity extends Activity {
 @InjectView(R.id.title) TextView title;
 @InjectView(R.id.hello) Button hello;
 @InjectView(R.id.list_of_things) ListView listOfThings;
 @OnClick(R.id.hello) void sayHello() {
 Toast.makeText(this, "Hello, views!", LENGTH_SHORT).show();
 } ! 
 // ...
 } jakewharton.github.io/butterknife/

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Butter Knife jakewharton.github.io/butterknife/ static void inject(Finder finder, final SimpleActivity target, Object source) {
 View view;
 view = finder.findRequired(source, 2130968576, "field 'title'");
 target.title = (android.widget.TextView) view;
 view = finder.findRequired(source, 2130968578, "field 'hello' and method 'sayHello'");
 target.hello = (android.widget.Button) view;
 view.setOnClickListener(new View.OnClickListener() {
 @Override public void onClick(View p0) {
 target.sayHello();
 }
 });
 view = finder.findRequired(source, 2130968579, "field 'listOfThings'"); target.listOfThings = (android.widget.ListView) view;
 }

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Butter Knife jakewharton.github.io/butterknife/ static void inject(Finder finder, final SimpleActivity target, Object source) {
 View view;
 view = finder.findRequired(source, 2130968576, "field 'title'");
 target.title = (android.widget.TextView) view;
 view = finder.findRequired(source, 2130968578, "field 'hello' and method 'sayHello'");
 target.hello = (android.widget.Button) view;
 view.setOnClickListener(new View.OnClickListener() {
 @Override public void onClick(View p0) {
 target.sayHello();
 }
 });
 view = finder.findRequired(source, 2130968579, "field 'listOfThings'"); target.listOfThings = (android.widget.ListView) view;
 }

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Butter Knife jakewharton.github.io/butterknife/ static void inject(Finder finder, final SimpleActivity target, Object source) {
 View view;
 view = finder.findRequired(source, 2130968576, "field 'title'");
 target.title = (android.widget.TextView) view;
 view = finder.findRequired(source, 2130968578, "field 'hello' and method 'sayHello'");
 target.hello = (android.widget.Button) view;
 view.setOnClickListener(new View.OnClickListener() {
 @Override public void onClick(View p0) {
 target.sayHello();
 }
 });
 view = finder.findRequired(source, 2130968579, "field 'listOfThings'"); target.listOfThings = (android.widget.ListView) view;
 }

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Butter Knife jakewharton.github.io/butterknife/ static void inject(Finder finder, final SimpleActivity target, Object source) {
 View view;
 view = finder.findRequired(source, 2130968576, "field 'title'");
 target.title = (android.widget.TextView) view;
 view = finder.findRequired(source, 2130968578, "field 'hello' and method 'sayHello'");
 target.hello = (android.widget.Button) view;
 view.setOnClickListener(new View.OnClickListener() {
 @Override public void onClick(View p0) {
 target.sayHello();
 }
 });
 view = finder.findRequired(source, 2130968579, "field 'listOfThings'"); target.listOfThings = (android.widget.ListView) view;
 }

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Dagger square.github.io/dagger/ @Module(injects = CoffeeApp.class)
 class DripCoffeeModule {
 @Provides @Singleton Heater provideHeater() {
 return new ElectricHeater();
 }
 
 @Provides Pump providePump(Thermosiphon pump) {
 return pump;
 }
 }


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Dagger class CoffeeMaker {
 @Inject Lazy heater;
 @Inject Pump pump;
 
 public void brew() {
 heater.get().on();
 pump.pump();
 System.out.println(" [_]P coffee! [_]P ");
 heater.get().off();
 }
 }
 square.github.io/dagger/

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Dagger square.github.io/dagger/ class DripCoffeeModule$$ModuleAdapter extends ModuleAdapter { 
 @Override
 public void getBindings(BindingsGroup bindings, DripCoffeeModule module) {
 bindings.contributeProvidesBinding("coffee.Heater", new ProvideHeaterAdapter(module)); bindings.contributeProvidesBinding("coffee.Pump",
 new ProvidePumpAdapter(module));
 } }

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Dagger square.github.io/dagger/ class DripCoffeeModule$$ModuleAdapter extends ModuleAdapter { 
 @Override
 public void getBindings(BindingsGroup bindings, DripCoffeeModule module) {
 bindings.contributeProvidesBinding("coffee.Heater", new ProvideHeaterAdapter(module)); bindings.contributeProvidesBinding("coffee.Pump",
 new ProvidePumpAdapter(module));
 } }

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Dagger square.github.io/dagger/ class ProvideHeaterProvidesAdapter extends ProvidesBinding { 
 private final DripCoffeeModule module;
 
 public ProvideHeaterProvidesAdapter(DripCoffeeModule module) {
 this.module = module;
 }
 
 @Override
 public Heater get() {
 return module.provideHeater();
 }
 }

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Dagger square.github.io/dagger/ class CoffeeMaker$$InjectAdapter
 extends Binding {
 
 private Binding> heater;
 private Binding pump;
 
 CoffeeMaker$$InjectAdapter() {
 super("coffee.CoffeeMaker", CoffeeMaker.class);
 }
 
 @Override public void attach(Linker linker) {
 heater = linker.requestBinding("dagger.Lazy");
 pump = linker.requestBinding("coffee.Pump");
 } ! // ...
 }

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Dagger square.github.io/dagger/ class CoffeeMaker$$InjectAdapter
 extends Binding {
 
 private Binding> heater;
 private Binding pump;
 
 CoffeeMaker$$InjectAdapter() {
 super("coffee.CoffeeMaker", CoffeeMaker.class);
 }
 
 @Override public void attach(Linker linker) {
 heater = linker.requestBinding("dagger.Lazy");
 pump = linker.requestBinding("coffee.Pump");
 } ! // ...
 }

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Dagger square.github.io/dagger/ class CoffeeMaker$$InjectAdapter
 extends Binding {
 
 // ...
 
 @Override public CoffeeMaker get() {
 CoffeeMaker result = new CoffeeMaker();
 injectMembers(result);
 return result;
 }
 
 @Override public void injectMembers(CoffeeMaker object) {
 object.heater = heater.get();
 object.pump = pump.get();
 }
 }

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Dagger square.github.io/dagger/ class CoffeeMaker$$InjectAdapter
 extends Binding {
 
 // ...
 
 @Override public CoffeeMaker get() {
 CoffeeMaker result = new CoffeeMaker();
 injectMembers(result);
 return result;
 }
 
 @Override public void injectMembers(CoffeeMaker object) {
 object.heater = heater.get();
 object.pump = pump.get();
 }
 }

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Dagger square.github.io/dagger/ @Module(injects = CoffeeApp.class)
 class DripCoffeeModule {
 @Provides @Singleton Heater provideHeater() {
 return new ElectricHeater();
 }
 
 @Provides Pump providePump(Thermosiphon pump) {
 return pump;
 }
 } class CoffeeMaker {
 @Inject Lazy heater;
 @Inject Pump pump;
 // ...
 }

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Dagger square.github.io/dagger/ @Module(injects = CoffeeApp.class)
 class DripCoffeeModule {
 @Provides @Singleton Heater provideHeater() {
 return new ElectricHeater();
 }
 
 @Provides Pump providePump(Thermosiphon pump) {
 return pump;
 }
 } class CoffeeMaker {
 @Inject Lazy heater;
 @Inject Pump pump;
 // ...
 } class ProvideHeaterProvidesAdapter extends ProvidesBinding { 
 private final DripCoffeeModule module;
 
 public ProvideHeaterProvidesAdapter(DripCoffeeModule module) {
 this.module = module;
 }
 
 @Override
 public Heater get() {
 return module.provideHeater();
 }
 }

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Dagger square.github.io/dagger/ @Module(injects = CoffeeApp.class)
 class DripCoffeeModule {
 @Provides @Singleton Heater provideHeater() {
 return new ElectricHeater();
 }
 
 @Provides Pump providePump(Thermosiphon pump) {
 return pump;
 }
 } class CoffeeMaker {
 @Inject Lazy heater;
 @Inject Pump pump;
 // ...
 } class DripCoffeeModule$$ModuleAdapter extends ModuleAdapter { 
 @Override
 public void getBindings(BindingsGroup bindings, DripCoffeeModule module) {
 bindings.contributeProvidesBinding("coffee.Heater", new ProvideHeaterAdapter(module)); bindings.contributeProvidesBinding("coffee.Pump",
 new ProvidePumpAdapter(module));
 } } class ProvideHeaterProvidesAdapter extends ProvidesBinding { 
 private final DripCoffeeModule module;
 
 public ProvideHeaterProvidesAdapter(DripCoffeeModule module) {
 this.module = module;
 }
 
 @Override
 public Heater get() {
 return module.provideHeater();
 }
 }

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Dagger square.github.io/dagger/ @Module(injects = CoffeeApp.class)
 class DripCoffeeModule {
 @Provides @Singleton Heater provideHeater() {
 return new ElectricHeater();
 }
 
 @Provides Pump providePump(Thermosiphon pump) {
 return pump;
 }
 } class CoffeeMaker {
 @Inject Lazy heater;
 @Inject Pump pump;
 // ...
 } class DripCoffeeModule$$ModuleAdapter extends ModuleAdapter { 
 @Override
 public void getBindings(BindingsGroup bindings, DripCoffeeModule module) {
 bindings.contributeProvidesBinding("coffee.Heater", new ProvideHeaterAdapter(module)); bindings.contributeProvidesBinding("coffee.Pump",
 new ProvidePumpAdapter(module));
 } } class ProvideHeaterProvidesAdapter extends ProvidesBinding { 
 private final DripCoffeeModule module;
 
 public ProvideHeaterProvidesAdapter(DripCoffeeModule module) {
 this.module = module;
 }
 
 @Override
 public Heater get() {
 return module.provideHeater();
 }
 } class ObjectGraph {
 // ...
 }

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Dagger square.github.io/dagger/ @Module(injects = CoffeeApp.class)
 class DripCoffeeModule {
 @Provides @Singleton Heater provideHeater() {
 return new ElectricHeater();
 }
 
 @Provides Pump providePump(Thermosiphon pump) {
 return pump;
 }
 } class CoffeeMaker {
 @Inject Lazy heater;
 @Inject Pump pump;
 // ...
 } class DripCoffeeModule$$ModuleAdapter extends ModuleAdapter { 
 @Override
 public void getBindings(BindingsGroup bindings, DripCoffeeModule module) {
 bindings.contributeProvidesBinding("coffee.Heater", new ProvideHeaterAdapter(module)); bindings.contributeProvidesBinding("coffee.Pump",
 new ProvidePumpAdapter(module));
 } } class ProvideHeaterProvidesAdapter extends ProvidesBinding { 
 private final DripCoffeeModule module;
 
 public ProvideHeaterProvidesAdapter(DripCoffeeModule module) {
 this.module = module;
 }
 
 @Override
 public Heater get() {
 return module.provideHeater();
 }
 } class CoffeeMaker$$InjectAdapter
 extends Binding {
 
 @Override public void attach(Linker linker) {
 heater = linker.requestBinding("dagger.Lazy");
 pump = linker.requestBinding("coffee.Pump");
 } 
 @Override public void injectMembers(CoffeeMaker object) {
 object.heater = heater.get();
 object.pump = pump.get();
 } ! // ...
 } class ObjectGraph {
 // ...
 }

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Dagger square.github.io/dagger/ @Module(injects = CoffeeApp.class)
 class DripCoffeeModule {
 @Provides @Singleton Heater provideHeater() {
 return new ElectricHeater();
 }
 
 @Provides Pump providePump(Thermosiphon pump) {
 return pump;
 }
 } class CoffeeMaker {
 @Inject Lazy heater;
 @Inject Pump pump;
 // ...
 } class DripCoffeeModule$$ModuleAdapter extends ModuleAdapter { 
 @Override
 public void getBindings(BindingsGroup bindings, DripCoffeeModule module) {
 bindings.contributeProvidesBinding("coffee.Heater", new ProvideHeaterAdapter(module)); bindings.contributeProvidesBinding("coffee.Pump",
 new ProvidePumpAdapter(module));
 } } class ProvideHeaterProvidesAdapter extends ProvidesBinding { 
 private final DripCoffeeModule module;
 
 public ProvideHeaterProvidesAdapter(DripCoffeeModule module) {
 this.module = module;
 }
 
 @Override
 public Heater get() {
 return module.provideHeater();
 }
 } class CoffeeMaker$$InjectAdapter
 extends Binding {
 
 @Override public void attach(Linker linker) {
 heater = linker.requestBinding("dagger.Lazy");
 pump = linker.requestBinding("coffee.Pump");
 } 
 @Override public void injectMembers(CoffeeMaker object) {
 object.heater = heater.get();
 object.pump = pump.get();
 } ! // ...
 } class ObjectGraph {
 // ...
 }

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Dagger square.github.io/dagger/ @Module(injects = CoffeeApp.class)
 class DripCoffeeModule {
 @Provides @Singleton Heater provideHeater() {
 return new ElectricHeater();
 }
 
 @Provides Pump providePump(Thermosiphon pump) {
 return pump;
 }
 } class CoffeeMaker {
 @Inject Lazy heater;
 @Inject Pump pump;
 // ...
 } class DripCoffeeModule$$ModuleAdapter extends ModuleAdapter { 
 @Override
 public void getBindings(BindingsGroup bindings, DripCoffeeModule module) {
 bindings.contributeProvidesBinding("coffee.Heater", new ProvideHeaterAdapter(module)); bindings.contributeProvidesBinding("coffee.Pump",
 new ProvidePumpAdapter(module));
 } } class ProvideHeaterProvidesAdapter extends ProvidesBinding { 
 private final DripCoffeeModule module;
 
 public ProvideHeaterProvidesAdapter(DripCoffeeModule module) {
 this.module = module;
 }
 
 @Override
 public Heater get() {
 return module.provideHeater();
 }
 } class CoffeeMaker$$InjectAdapter
 extends Binding {
 
 @Override public void attach(Linker linker) {
 heater = linker.requestBinding("dagger.Lazy");
 pump = linker.requestBinding("coffee.Pump");
 } 
 @Override public void injectMembers(CoffeeMaker object) {
 object.heater = heater.get();
 object.pump = pump.get();
 } ! // ...
 }

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Schematic interface NoteColumns {
 
 @DataType(INTEGER) @PrimaryKey @AutoIncrement
 String _ID = "_id";
 
 @DataType(INTEGER) @References(table = NotesDatabase.LISTS,
 column = ListColumns._ID)
 String LIST_ID = "listId";
 
 @DataType(TEXT) String NOTE = "note";
 } github.com/SimonVT/schematic/

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Schematic @Database(version = NotesDatabase.VERSION)
 public final class NotesDatabase {
 
 public static final int VERSION = 1;
 
 @Table(ListColumns.class)
 public static final String LISTS = "lists";
 
 @Table(NoteColumns.class)
 public static final String NOTES = "notes";
 
 } github.com/SimonVT/schematic/

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Schematic @ContentProvider(authority = NotesProvider.AUTHORITY,
 database = NotesDatabase.class)
 public final class NotesProvider {
 // ...
 } github.com/SimonVT/schematic/

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Execution

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Execution • Happens automatically when javac runs.

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Execution • Happens automatically when javac runs. • ServiceLoader finds and creates Processor instances.

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interface Processor {
 Set getSupportedOptions();
 
 Set getSupportedAnnotationTypes();
 
 SourceVersion getSupportedSourceVersion();
 
 void init(ProcessingEnvironment processingEnv);
 
 boolean process(Set extends TypeElement> annotations,
 RoundEnvironment roundEnv);
 
 Iterable extends Completion> getCompletions(Element element,
 AnnotationMirror annotation,
 ExecutableElement member,
 String userText);
 }

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public class ExampleProcessor extends AbstractProcessor {
 
 
 
 
 
 
 
 
 
 
 
 
 
 }

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public class ExampleProcessor extends AbstractProcessor {
 @Override public SourceVersion getSupportedSourceVersion() {
 
 }
 
 
 
 
 
 
 
 
 
 
 }

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public class ExampleProcessor extends AbstractProcessor {
 @Override public SourceVersion getSupportedSourceVersion() {
 return SourceVersion.latestSupported();
 }
 
 
 
 
 
 
 
 
 
 
 }

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public class ExampleProcessor extends AbstractProcessor {
 @Override public SourceVersion getSupportedSourceVersion() {
 return SourceVersion.latestSupported();
 }
 
 @Override public Set getSupportedAnnotationTypes() {
 
 }
 
 
 
 
 
 
 }

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public class ExampleProcessor extends AbstractProcessor {
 @Override public SourceVersion getSupportedSourceVersion() {
 return SourceVersion.latestSupported();
 }
 
 @Override public Set getSupportedAnnotationTypes() {
 return Collections.singleton(Example.class.getName());
 }
 
 
 
 
 
 
 }

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public class ExampleProcessor extends AbstractProcessor {
 @Override public SourceVersion getSupportedSourceVersion() {
 return SourceVersion.latestSupported();
 }
 
 @Override public Set getSupportedAnnotationTypes() {
 return Collections.singleton(Example.class.getName());
 }
 
 @Override public boolean process(
 Set extends TypeElement> annotations,
 RoundEnvironment env) {
 
 }
 }

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public class ExampleProcessor extends AbstractProcessor {
 // ...
 @Override public boolean process(
 Set extends TypeElement> annotations,
 RoundEnvironment env) {
 ! ! ! ! ! 
 }
 }

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public class ExampleProcessor extends AbstractProcessor {
 // ...
 
 @Override public boolean process(
 Set extends TypeElement> annotations,
 RoundEnvironment env) {
 Set extends Element> elements
 = env.getElementsAnnotatedWith(Example.class);
 
 
 
 
 
 }
 }

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public class ExampleProcessor extends AbstractProcessor {
 // ...
 
 @Override public boolean process(
 Set extends TypeElement> annotations,
 RoundEnvironment env) {
 Set extends Element> elements
 = env.getElementsAnnotatedWith(Example.class);
 for (Element element : elements) {
 System.out.println(element);
 }
 
 
 }
 }

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public class ExampleProcessor extends AbstractProcessor {
 // ...
 
 @Override public boolean process(
 Set extends TypeElement> annotations,
 RoundEnvironment env) {
 Set extends Element> elements
 = env.getElementsAnnotatedWith(Example.class);
 for (Element element : elements) {
 System.out.println(element);
 }
 
 return false;
 }
 }

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public class ExampleProcessor extends AbstractProcessor {
 @Override public SourceVersion getSupportedSourceVersion() {
 return SourceVersion.latestSupported();
 }
 
 @Override public Set getSupportedAnnotationTypes() {
 return Collections.singleton(Example.class.getName());
 }
 
 @Override public boolean process(
 Set extends TypeElement> annotations,
 RoundEnvironment env) {
 Set extends Element> elements
 = env.getElementsAnnotatedWith(Example.class);
 for (Element element : elements) {
 System.out.println(element);
 }
 return false;
 }
 }

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Execution • Happens automatically when javac runs. • ServiceLoader finds and creates Processor instances.

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Execution • Happens automatically when javac runs. • ServiceLoader finds and creates Processor instances. • Inside a full JVM.

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Execution • Happens automatically when javac runs. • ServiceLoader finds and creates Processor instances. • Inside a full JVM. • Compiled sources and its dependencies not available.

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Execution • Happens automatically when javac runs. • ServiceLoader finds and creates Processor instances. • Inside a full JVM. • Compiled sources and its dependencies not available. • Bring your own dependencies.

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Environment interface Processor {
 Set getSupportedOptions();
 
 Set getSupportedAnnotationTypes();
 
 SourceVersion getSupportedSourceVersion();
 
 void init(ProcessingEnvironment processingEnv);
 
 boolean process(Set extends TypeElement> annotations,
 RoundEnvironment roundEnv);
 
 Iterable extends Completion> getCompletions(Element element,
 AnnotationMirror annotation,
 ExecutableElement member,
 String userText);
 }

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Environment interface Processor {
 Set getSupportedOptions();
 
 Set getSupportedAnnotationTypes();
 
 SourceVersion getSupportedSourceVersion();
 
 void init(ProcessingEnvironment processingEnv);
 
 boolean process(Set extends TypeElement> annotations,
 RoundEnvironment roundEnv);
 
 Iterable extends Completion> getCompletions(Element element,
 AnnotationMirror annotation,
 ExecutableElement member,
 String userText);
 }

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Environment interface Processor {
 Set getSupportedOptions();
 
 Set getSupportedAnnotationTypes();
 
 SourceVersion getSupportedSourceVersion();
 
 void init(ProcessingEnvironment processingEnv);
 
 boolean process(Set extends TypeElement> annotations,
 RoundEnvironment roundEnv);
 
 Iterable extends Completion> getCompletions(Element element,
 AnnotationMirror annotation,
 ExecutableElement member,
 String userText);
 }

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Processing Environment interface ProcessingEnvironment {
 Map getOptions(); 
 SourceVersion getSourceVersion();
 
 Locale getLocale();
 
 Messager getMessager();
 
 Filer getFiler();
 
 Elements getElementUtils();
 
 Types getTypeUtils();
 }

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Processing Environment interface ProcessingEnvironment {
 Map getOptions(); 
 SourceVersion getSourceVersion();
 
 Locale getLocale();
 
 Messager getMessager();
 
 Filer getFiler();
 
 Elements getElementUtils();
 
 Types getTypeUtils();
 }

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Processing Environment interface ProcessingEnvironment {
 Map getOptions(); 
 SourceVersion getSourceVersion();
 
 Locale getLocale();
 
 Messager getMessager();
 
 Filer getFiler();
 
 Elements getElementUtils();
 
 Types getTypeUtils();
 }

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Processing Environment interface ProcessingEnvironment {
 Map getOptions(); 
 SourceVersion getSourceVersion();
 
 Locale getLocale();
 
 Messager getMessager();
 
 Filer getFiler();
 
 Elements getElementUtils();
 
 Types getTypeUtils();
 }

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Elements @Example
 public class ExampleClass implements Runnable { 
 private final String name;
 
 public ExampleClass(String name) {
 this.name = name;
 }
 
 @Override public void run() {
 System.out.println("Hello, " + name);
 }
 }

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Elements @Example
 public class ExampleClass implements Runnable { 
 private final String name;
 
 public ExampleClass(String name) {
 this.name = name;
 }
 
 @Override public void run() {
 System.out.println("Hello, " + name);
 }
 } TypeElement

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Elements @Example
 public class ExampleClass implements Runnable { 
 private final String name;
 
 public ExampleClass(String name) {
 this.name = name;
 }
 
 @Override public void run() {
 System.out.println("Hello, " + name);
 }
 } TypeElement VariableElement

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Elements @Example
 public class ExampleClass implements Runnable { 
 private final String name;
 
 public ExampleClass(String name) {
 this.name = name;
 }
 
 @Override public void run() {
 System.out.println("Hello, " + name);
 }
 } TypeElement VariableElement ExecutableElement

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Elements @Example
 public class ExampleClass implements Runnable { 
 private final String name;
 
 public ExampleClass(String name) {
 this.name = name;
 }
 
 @Override public void run() {
 System.out.println("Hello, " + name);
 }
 } TypeElement VariableElement ExecutableElement ExecutableElement

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Elements @Example
 public class ExampleClass implements Runnable { 
 private final String name;
 
 public ExampleClass(String name) {
 this.name = name;
 }
 
 @Override public void run() {
 System.out.println("Hello, " + name);
 }
 } TypeElement VariableElement ExecutableElement ExecutableElement

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Elements @Example
 public class ExampleClass implements Runnable { 
 private final String name;
 
 public ExampleClass(String name) {
 this.name = name;
 }
 
 @Override public void run() {
 System.out.println("Hello, " + name);
 }
 } TypeElement VariableElement ExecutableElement ExecutableElement

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Types @Example
 public class ExampleClass implements Runnable { 
 private final String name;
 
 public ExampleClass(String name) {
 this.name = name;
 }
 
 @Override public void run() {
 System.out.println("Hello, " + name);
 }
 }

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Types @Example
 public class ExampleClass implements Runnable { 
 private final String name;
 
 public ExampleClass(String name) {
 this.name = name;
 }
 
 @Override public void run() {
 System.out.println("Hello, " + name);
 }
 }

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Types @Example
 public class ExampleClass implements Runnable { 
 private final String name;
 
 public ExampleClass(String name) {
 this.name = name;
 }
 
 @Override public void run() {
 System.out.println("Hello, " + name);
 }
 }

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Types @Example
 public class ExampleClass implements Runnable { 
 private final String name;
 
 public ExampleClass(String name) {
 this.name = name;
 }
 
 @Override public void run() {
 System.out.println("Hello, " + name);
 }
 }

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Types @Example
 public class ExampleClass implements Runnable { 
 private final String name;
 
 public ExampleClass(String name) {
 this.name = name;
 }
 
 @Override public void run() {
 System.out.println("Hello, " + name);
 }
 }

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Types @Example
 public class ExampleClass implements Runnable { 
 private final String name;
 
 public ExampleClass(String name) {
 this.name = name;
 }
 
 @Override public void run() {
 System.out.println("Hello, " + name);
 }
 }

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Environment public class ExampleProcessor extends AbstractProcessor {
 // ...
 
 @Override public boolean process(
 Set extends TypeElement> annotations,
 RoundEnvironment env) {
 Set extends Element> elements
 = env.getElementsAnnotatedWith(Example.class);
 for (Element element : elements) {
 System.out.println(element
 }
 return false;
 }
 } 
 
 
 
 
 
 
 
 
 );
 
 
 


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Environment public class ExampleProcessor extends AbstractProcessor {
 // ...
 
 @Override public boolean process(
 Set extends TypeElement> annotations,
 RoundEnvironment env) {
 Set extends Element> elements
 = env.getElementsAnnotatedWith(Example.class);
 for (Element element : elements) {
 System.out.println(element
 }
 return false;
 }
 } 
 
 
 
 
 
 
 
 
 );
 
 
 


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Environment public class ExampleProcessor extends AbstractProcessor {
 // ...
 
 @Override public boolean process(
 Set extends TypeElement> annotations,
 RoundEnvironment env) {
 Set extends Element> elements
 = env.getElementsAnnotatedWith(Example.class);
 for (Element element : elements) {
 System.out.println( );
 }
 return false;
 }
 } 
 
 
 
 
 
 
 
 
 element.asType()
 
 
 


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Environment public class ExampleProcessor extends AbstractProcessor {
 // ...
 
 @Override public boolean process(
 Set extends TypeElement> annotations,
 RoundEnvironment env) {
 Set extends Element> elements
 = env.getElementsAnnotatedWith(Example.class);
 for (Element element : elements) {
 System.out.println(element.asType());
 }
 return false;
 }
 }

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Environment public class ExampleProcessor extends AbstractProcessor {
 // ...
 
 @Override public boolean process(
 Set extends TypeElement> annotations,
 RoundEnvironment env) {
 Set extends Element> elements
 = env.getElementsAnnotatedWith(Example.class);
 for (Element element : elements) {
 System.out.println(element.asType());
 }
 return false;
 }
 }

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Environment public class ExampleProcessor extends AbstractProcessor {
 // ...
 
 @Override public boolean process(
 Set extends TypeElement> annotations,
 RoundEnvironment env) {
 Set extends Element> elements
 = env.getElementsAnnotatedWith(Example.class);
 for (Element element : elements) {
 System.out.println(element.asType());
 }
 return false;
 }
 }

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Processing Rounds @Example
 public class RandomClass {
 // ...
 }

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Processing Rounds @Example
 public class RandomClass {
 // ...
 } javac

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Processing Rounds @Example
 public class RandomClass {
 // ...
 } ExampleProcessor OtherProcessor javac

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Processing Rounds @Example
 public class RandomClass {
 // ...
 } ExampleProcessor OtherProcessor javac javac

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Processing Rounds @Example
 public class RandomClass {
 // ...
 } ExampleProcessor OtherProcessor javac RandomClass.class out/ @Example
 public class RandomClass {
 // ...
 } javac

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Processing Rounds @Example
 public class RandomClass {
 // ...
 } ExampleProcessor OtherProcessor javac RandomClass.class out/ @Example
 public class RandomClass {
 // ...
 } javac ExampleProcessor

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Processing Rounds @Example
 public class RandomClass {
 // ...
 } ExampleProcessor OtherProcessor javac RandomClass.class out/ @Other
 public class GeneratedClass {
 // ...
 } @Example
 public class RandomClass {
 // ...
 } javac ExampleProcessor

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Processing Rounds @Example
 public class RandomClass {
 // ...
 } ExampleProcessor OtherProcessor javac RandomClass.class out/ @Other
 public class GeneratedClass {
 // ...
 } @Example
 public class RandomClass {
 // ...
 } javac OtherProcessor

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Processing Rounds @Example
 public class RandomClass {
 // ...
 } ExampleProcessor OtherProcessor javac RandomClass.class out/ @Other
 public class GeneratedClass {
 // ...
 } @Example
 public class RandomClass {
 // ...
 } javac

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Processing Rounds @Example
 public class RandomClass {
 // ...
 } ExampleProcessor OtherProcessor javac RandomClass.class out/ @Other
 public class GeneratedClass {
 // ...
 } @Example
 public class RandomClass {
 // ...
 } javac

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Processing Rounds @Example
 public class RandomClass {
 // ...
 } ExampleProcessor OtherProcessor javac RandomClass.class out/ @Other
 public class GeneratedClass {
 // ...
 } @Example
 public class RandomClass {
 // ...
 }

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Processing Rounds @Example
 public class RandomClass {
 // ...
 } ExampleProcessor OtherProcessor javac RandomClass.class out/ @Other
 public class GeneratedClass {
 // ...
 } @Example
 public class RandomClass {
 // ...
 } javac

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Processing Rounds @Example
 public class RandomClass {
 // ...
 } ExampleProcessor OtherProcessor javac RandomClass.class out/ @Other
 public class GeneratedClass {
 // ...
 } @Example
 public class RandomClass {
 // ...
 } javac

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Processing Rounds @Example
 public class RandomClass {
 // ...
 } ExampleProcessor OtherProcessor javac RandomClass.class out/ @Other
 public class GeneratedClass {
 // ...
 } GeneratedClass.class @Example
 public class RandomClass {
 // ...
 } @Other
 public class GeneratedClass {
 // ...
 } javac

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Processing Rounds @Example
 public class RandomClass {
 // ...
 } ExampleProcessor OtherProcessor javac RandomClass.class out/ @Other
 public class GeneratedClass {
 // ...
 } GeneratedClass.class @Example
 public class RandomClass {
 // ...
 } @Other
 public class GeneratedClass {
 // ...
 } javac ExampleProcessor

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Processing Rounds @Example
 public class RandomClass {
 // ...
 } ExampleProcessor OtherProcessor javac RandomClass.class out/ @Other
 public class GeneratedClass {
 // ...
 } GeneratedClass.class @Example
 public class RandomClass {
 // ...
 } @Other
 public class GeneratedClass {
 // ...
 } javac OtherProcessor

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Processing Rounds @Example
 public class RandomClass {
 // ...
 } ExampleProcessor OtherProcessor javac RandomClass.class out/ @Other
 public class GeneratedClass {
 // ...
 } GeneratedClass.class @Example
 public class RandomClass {
 // ...
 } @Other
 public class GeneratedClass {
 // ...
 } javac OtherProcessor public class OtherGenClass {
 // ...
 }

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Processing Rounds @Example
 public class RandomClass {
 // ...
 } ExampleProcessor OtherProcessor javac RandomClass.class out/ @Other
 public class GeneratedClass {
 // ...
 } GeneratedClass.class @Example
 public class RandomClass {
 // ...
 } @Other
 public class GeneratedClass {
 // ...
 } javac public class OtherGenClass {
 // ...
 }

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Processing Rounds @Example
 public class RandomClass {
 // ...
 } ExampleProcessor OtherProcessor javac RandomClass.class out/ @Other
 public class GeneratedClass {
 // ...
 } GeneratedClass.class @Example
 public class RandomClass {
 // ...
 } @Other
 public class GeneratedClass {
 // ...
 } javac public class OtherGenClass {
 // ...
 }

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Processing Rounds @Example
 public class RandomClass {
 // ...
 } ExampleProcessor OtherProcessor javac RandomClass.class out/ @Other
 public class GeneratedClass {
 // ...
 } GeneratedClass.class @Example
 public class RandomClass {
 // ...
 } @Other
 public class GeneratedClass {
 // ...
 } javac public class OtherGenClass {
 // ...
 }

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Processing Rounds @Example
 public class RandomClass {
 // ...
 } ExampleProcessor OtherProcessor javac RandomClass.class out/ @Other
 public class GeneratedClass {
 // ...
 } GeneratedClass.class @Example
 public class RandomClass {
 // ...
 } @Other
 public class GeneratedClass {
 // ...
 } javac public class OtherGenClass {
 // ...
 } OtherGenClass.class public class OtherGenClass {
 // ...
 }

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Processing Rounds @Example
 public class RandomClass {
 // ...
 } ExampleProcessor OtherProcessor javac RandomClass.class out/ @Other
 public class GeneratedClass {
 // ...
 } GeneratedClass.class @Example
 public class RandomClass {
 // ...
 } @Other
 public class GeneratedClass {
 // ...
 } javac public class OtherGenClass {
 // ...
 } ExampleProcessor OtherGenClass.class public class OtherGenClass {
 // ...
 }

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Processing Rounds @Example
 public class RandomClass {
 // ...
 } ExampleProcessor OtherProcessor javac RandomClass.class out/ @Other
 public class GeneratedClass {
 // ...
 } GeneratedClass.class @Example
 public class RandomClass {
 // ...
 } @Other
 public class GeneratedClass {
 // ...
 } javac public class OtherGenClass {
 // ...
 } OtherProcessor OtherGenClass.class public class OtherGenClass {
 // ...
 }

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Processing Rounds @Example
 public class RandomClass {
 // ...
 } ExampleProcessor OtherProcessor javac RandomClass.class out/ @Other
 public class GeneratedClass {
 // ...
 } GeneratedClass.class @Example
 public class RandomClass {
 // ...
 } @Other
 public class GeneratedClass {
 // ...
 } javac public class OtherGenClass {
 // ...
 } OtherGenClass.class public class OtherGenClass {
 // ...
 }

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Processing Rounds @Example
 public class RandomClass {
 // ...
 } ExampleProcessor OtherProcessor javac RandomClass.class out/ @Other
 public class GeneratedClass {
 // ...
 } GeneratedClass.class @Example
 public class RandomClass {
 // ...
 } @Other
 public class GeneratedClass {
 // ...
 } javac public class OtherGenClass {
 // ...
 } OtherGenClass.class public class OtherGenClass {
 // ...
 }

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Processing Rounds @Example
 public class RandomClass {
 // ...
 } ExampleProcessor OtherProcessor javac RandomClass.class out/ @Other
 public class GeneratedClass {
 // ...
 } GeneratedClass.class @Example
 public class RandomClass {
 // ...
 } @Other
 public class GeneratedClass {
 // ...
 } public class OtherGenClass {
 // ...
 } OtherGenClass.class public class OtherGenClass {
 // ...
 }

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No content

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JavaCompiler

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ExampleProcessor JavaCompiler OtherProcessor

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ProcessingEnvironment ExampleProcessor JavaCompiler Filer OtherProcessor

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ProcessingEnvironment ExampleProcessor JavaCompiler Filer OtherProcessor init() init()

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ProcessingEnvironment ExampleProcessor JavaCompiler Filer OtherProcessor init() init()

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ProcessingEnvironment ExampleProcessor JavaCompiler Filer OtherProcessor init() init()

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ProcessingEnvironment ExampleProcessor JavaCompiler RoundEnvironment Filer OtherProcessor init() init()

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ProcessingEnvironment ExampleProcessor JavaCompiler RoundEnvironment Filer OtherProcessor init() process() init()

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ProcessingEnvironment ExampleProcessor JavaCompiler RoundEnvironment Filer OtherProcessor init() process() init()

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ProcessingEnvironment ExampleProcessor JavaCompiler RoundEnvironment Filer OtherProcessor init() process() init()

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ProcessingEnvironment ExampleProcessor JavaCompiler RoundEnvironment Filer OtherProcessor init() process() init()

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ProcessingEnvironment ExampleProcessor JavaCompiler RoundEnvironment Filer OtherProcessor init() process() init()

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ProcessingEnvironment ExampleProcessor JavaCompiler RoundEnvironment Filer OtherProcessor init() process() init()

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ProcessingEnvironment ExampleProcessor JavaCompiler RoundEnvironment Filer OtherProcessor init() process() init() process()

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ProcessingEnvironment ExampleProcessor JavaCompiler RoundEnvironment Filer OtherProcessor init() process() init() process()

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ProcessingEnvironment ExampleProcessor JavaCompiler RoundEnvironment Filer OtherProcessor init() process() init() process()

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ProcessingEnvironment ExampleProcessor JavaCompiler RoundEnvironment Filer OtherProcessor init() process() init() process()

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Parsing and Generation public class ExampleProcessor extends AbstractProcessor {
 // ...
 
 @Override public boolean process(
 Set extends TypeElement> annotations,
 RoundEnvironment env) {
 Set extends Element> elements
 = env.getElementsAnnotatedWith(Example.class);
 
 for (Element element : elements) {
 
 
 }
 return false;
 }
 }

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Parsing and Generation public class ExampleProcessor extends AbstractProcessor {
 // ...
 
 @Override public boolean process(
 Set extends TypeElement> annotations,
 RoundEnvironment env) {
 Set extends Element> elements
 = env.getElementsAnnotatedWith(Example.class);
 
 for (Element element : elements) {
 
 
 }
 return false;
 }
 } 
 
 
 
 
 
 
 
 
 // Look at attributes of 'element'.
 
 
 
 


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Parsing and Generation public class ExampleProcessor extends AbstractProcessor {
 // ...
 
 @Override public boolean process(
 Set extends TypeElement> annotations,
 RoundEnvironment env) {
 Set extends Element> elements
 = env.getElementsAnnotatedWith(Example.class);
 
 for (Element element : elements) {
 
 
 }
 return false;
 }
 } 
 
 
 
 
 
 
 
 
 // Look at attributes of 'element'.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 // Generate some code based on attributes.
 
 
 


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Parsing and Generation @Override public boolean process(
 Set extends TypeElement> annotations,
 RoundEnvironment env) {
 
 
 
 
 return false;
 }


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Parsing and Generation @Override public boolean process(
 Set extends TypeElement> annotations,
 RoundEnvironment env) {
 
 
 
 
 return false;
 }
 
 
 
 List models = parseExampleAnnotations(env);

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Parsing and Generation @Override public boolean process(
 Set extends TypeElement> annotations,
 RoundEnvironment env) {
 
 
 
 
 return false;
 }
 
 
 
 List models = parseExampleAnnotations(env); 
 
 
 
 
 
 
 
 
 
 List parseExampleAnnotations(RoundEnvironment env) {
 // ...
 }

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Parsing and Generation @Override public boolean process(
 Set extends TypeElement> annotations,
 RoundEnvironment env) {
 
 
 
 
 return false;
 }
 
 
 
 List models = parseExampleAnnotations(env); 
 
 
 
 for (ExampleModel model : models) {
 emitExampleCode(model);
 } 
 
 
 
 
 
 
 
 
 
 List parseExampleAnnotations(RoundEnvironment env) {
 // ...
 }

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Parsing and Generation @Override public boolean process(
 Set extends TypeElement> annotations,
 RoundEnvironment env) {
 
 
 
 
 return false;
 }
 
 
 
 List models = parseExampleAnnotations(env); 
 
 
 
 for (ExampleModel model : models) {
 emitExampleCode(model);
 } 
 
 
 
 
 
 
 
 
 
 List parseExampleAnnotations(RoundEnvironment env) {
 // ...
 } 
 
 
 
 
 
 
 
 
 ! ! 
 
 void emitExampleCode(ExampleModel model) {
 // ...
 }

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Parsing and Generation Element

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Parsing and Generation Element

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Parsing and Generation Element ExampleModel ! name: “Foo” package: “com.example” public: true

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Parsing and Generation Element ExampleModel ! name: “Foo” package: “com.example” public: true

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Parsing and Generation Element ExampleModel ! name: “Foo” package: “com.example” public: true ExampleModel ! name: “Foo” package: “com.example” public: true element:

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Parsing and Generation Element ExampleModel ! name: “Foo” package: “com.example” public: true ExampleModel ! name: “Foo” package: “com.example” public: true element: GeneratedClass

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Parsing and Generation Element ExampleModel ! name: “Foo” package: “com.example” public: true ExampleModel ! name: “Foo” package: “com.example” public: true element: GeneratedClass

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Bring Your Own Dependencies

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Bring Your Own Dependencies • Guava, Guava, Guava!

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Bring Your Own Dependencies • Guava, Guava, Guava! • JavaWriter

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Bring Your Own Dependencies • Guava, Guava, Guava! • JavaWriter • google/auto ‘common’

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Bring Your Own Dependencies • Guava, Guava, Guava! • JavaWriter • google/auto ‘common’ • AutoService (google/auto)

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JavaWriter

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JavaWriter JavaFileObject sourceFile = filer.createSourceFile(name, element);

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JavaWriter JavaFileObject sourceFile = filer.createSourceFile(name, element); ! ! ! JavaWriter writer = new JavaWriter(sourceFile.openWriter());
 writer.emitPackage("com.example")
 .emitAnnotation(Other.class)
 .beginType("GeneratedClass", "class")
 .emitSingleLineComment("...")
 .endType();

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JavaWriter JavaFileObject sourceFile = filer.createSourceFile(name, element); ! ! @com.example.Other
 public class GeneratedClass {
 // ...
 } ! ! ! JavaWriter writer = new JavaWriter(sourceFile.openWriter());
 writer.emitPackage("com.example")
 .emitAnnotation(Other.class)
 .beginType("GeneratedClass", "class")
 .emitSingleLineComment("...")
 .endType();

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JavaWriter JavaFileObject sourceFile = filer.createSourceFile(name, element); import com.example.Other; ! @Other
 public class GeneratedClass {
 // ...
 } ! ! ! JavaWriter writer = new JavaWriter(sourceFile.openWriter());
 writer.emitPackage("com.example")
 .emitImports(Other.class)
 .emitAnnotation(Other.class)
 .beginType("GeneratedClass", "class")
 .emitSingleLineComment("...")
 .endType();

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AutoService

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AutoService • Remember “ServiceLoader finds and creates”

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AutoService • Remember “ServiceLoader finds and creates” • AutoService generates service files from annotations

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AutoService • Remember “ServiceLoader finds and creates” • AutoService generates service files from annotations ! public class ExampleProcessor extends AbstractProcessor { // ... }

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AutoService • Remember “ServiceLoader finds and creates” • AutoService generates service files from annotations ! public class ExampleProcessor extends AbstractProcessor { // ... } @AutoService(Processor.class)

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Testing and Debugging

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Testing and Debugging • Google to the rescue!

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Testing and Debugging • Google to the rescue! • Guava, Guava, Guava!

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Testing and Debugging • Google to the rescue! • Guava, Guava, Guava! • compile-testing

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Testing and Debugging • Google to the rescue! • Guava, Guava, Guava! • compile-testing • Truth

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final class TestProcessors {
 static Iterable extends Processor> exampleProcessors() {
 return Collections.singletonList(
 new ExampleProcessor()
 );
 }
 }

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String input = Joiner.on('\n').join(
 "package test;",
 "import com.example.Example;",
 "@Example",
 "public class ExampleClass {",
 "}"
 );

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String input = Joiner.on('\n').join(
 "package test;",
 "import com.example.Example;",
 "@Example",
 "public class ExampleClass {",
 "}"
 ); JavaFileObject inputFile =
 JavaFileObjects.forSourceString("test.Test", input);

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JavaFileObject inputFile =
 JavaFileObjects.forSourceString("test.Test", input); String input = """\
 package test; 
 import com.example.Example; 
 @Example
 public class ExampleClass {
 } """ .stripIndent()

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String expected = Joiner.on('\n').join(
 "package test;",
 "import com.example.Other;",
 "@Other",
 "public class GeneratedClass {",
 "}"
 );

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String expected = Joiner.on('\n').join(
 "package test;",
 "import com.example.Other;",
 "@Other",
 "public class GeneratedClass {",
 "}"
 ); JavaFileObject expectedFile =
 JavaFileObjects.forSourceString("test.GeneratedClass", expected);

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ASSERT.about(javaSource())
 .that(inputFile)
 .processedWith(exampleProcessors())
 .compilesWithoutError()
 .and()
 .generatesSources(expectedFile);

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ASSERT.about(javaSource())
 .that(inputFile)
 .processedWith(exampleProcessors())
 .compilesWithoutError()
 .and()
 .generatesSources(expectedFile);

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ASSERT.about(javaSource())
 .that(inputFile)
 .processedWith(exampleProcessors())
 .compilesWithoutError()
 .and()
 .generatesSources(expectedFile);

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ASSERT.about(javaSource())
 .that(inputFile)
 .processedWith(exampleProcessors())
 .compilesWithoutError()
 .and()
 .generatesSources(expectedFile); String input = Joiner.on('\n').join(
 "package test;",
 "import com.example.Example;",
 "@Example",
 "public class ExampleClass {",
 "}"
 );

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ASSERT.about(javaSource())
 .that(inputFile)
 .processedWith(exampleProcessors())
 .compilesWithoutError()
 .and()
 .generatesSources(expectedFile); String input = Joiner.on('\n').join(
 "package test;",
 "import com.example.Example;",
 "@Example",
 "public class ExampleClass {",
 "}"
 ); final class TestProcessors {
 static Iterable extends Processor> exampleProcessors() {
 return Collections.singletonList(
 new ExampleProcessor()
 );
 }
 }

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ASSERT.about(javaSource())
 .that(inputFile)
 .processedWith(exampleProcessors())
 .compilesWithoutError()
 .and()
 .generatesSources(expectedFile); String input = Joiner.on('\n').join(
 "package test;",
 "import com.example.Example;",
 "@Example",
 "public class ExampleClass {",
 "}"
 ); final class TestProcessors {
 static Iterable extends Processor> exampleProcessors() {
 return Collections.singletonList(
 new ExampleProcessor()
 );
 }
 } String expected = Joiner.on('\n').join(
 "package test;",
 "import com.example.Other;",
 "@Other",
 "public class GeneratedClass {",
 "}"
 );

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ASSERT.about(javaSource())
 .that(inputFile)
 .processedWith(exampleProcessors())
 .compilesWithoutError()
 .and()
 .generatesSources(expectedFile); String input = Joiner.on('\n').join(
 "package test;",
 "import com.example.Example;",
 "@Example",
 "public class ExampleClass {",
 "}"
 ); final class TestProcessors {
 static Iterable extends Processor> exampleProcessors() {
 return Collections.singletonList(
 new ExampleProcessor()
 );
 }
 } String expected = Joiner.on('\n').join(
 "package test;",
 "import com.example.Other;",
 "@Other",
 "public class GeneratedClass {",
 "}"
 );

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public class ExampleProcessor extends AbstractProcessor {
 // ...
 
 @Override public boolean process(
 Set extends TypeElement> annotations,
 RoundEnvironment env) {
 Set extends Element> elements
 = env.getElementsAnnotatedWith(Example.class);
 for (Element element : elements) {
 System.out.println(element
 }
 return false;
 }
 } Debugging

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public class ExampleProcessor extends AbstractProcessor {
 // ...
 
 @Override public boolean process(
 Set extends TypeElement> annotations,
 RoundEnvironment env) {
 Set extends Element> elements
 = env.getElementsAnnotatedWith(Example.class);
 for (Element element : elements) {
 System.out.println(element
 }
 return false;
 }
 } Debugging

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Now What?

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No content

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Questions?