initial Build Compatible Extension API proposal

api/src/main/java/jakarta/enterprise/inject/build/compatible/spi/AnnotationConfig.java

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+package jakarta.enterprise.inject.build.compatible.spi;
+
+import jakarta.enterprise.lang.model.AnnotationAttribute;
+import jakarta.enterprise.lang.model.AnnotationInfo;
+import jakarta.enterprise.lang.model.declarations.ClassInfo;
+import java.lang.annotation.Annotation;
+import java.util.function.Predicate;
+
+// TODO better name?
+// TODO devise a builder-style API instead (see also Annotations)
+public interface AnnotationConfig {
+    void addAnnotation(Class<? extends Annotation> annotationType, AnnotationAttribute... attributes);
+
+    void addAnnotation(ClassInfo<?> annotationType, AnnotationAttribute... attributes);
+
+    void addAnnotation(AnnotationInfo annotation);
+
+    void addAnnotation(Annotation annotation);
+
+    void removeAnnotation(Predicate<AnnotationInfo> predicate);
+
+    void removeAllAnnotations();
+}

api/src/main/java/jakarta/enterprise/inject/build/compatible/spi/Annotations.java

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+package jakarta.enterprise.inject.build.compatible.spi;
+
+import jakarta.enterprise.lang.model.AnnotationAttribute;
+import jakarta.enterprise.lang.model.AnnotationAttributeValue;
+import jakarta.enterprise.lang.model.AnnotationInfo;
+import jakarta.enterprise.lang.model.declarations.ClassInfo;
+import java.lang.annotation.Annotation;
+import java.util.List;
+
+// TODO devise a builder-style API instead (see also AnnotationConfig)
+public interface Annotations {
+    AnnotationAttributeValue value(boolean value);
+
+    AnnotationAttributeValue value(byte value);
+
+    AnnotationAttributeValue value(short value);
+
+    AnnotationAttributeValue value(int value);
+
+    AnnotationAttributeValue value(long value);
+
+    AnnotationAttributeValue value(float value);
+
+    AnnotationAttributeValue value(double value);
+
+    AnnotationAttributeValue value(char value);
+
+    AnnotationAttributeValue value(String value);
+
+    AnnotationAttributeValue value(Enum<?> enumValue);
+
+    AnnotationAttributeValue value(Class<? extends Enum<?>> enumType, String enumValue);
+
+    AnnotationAttributeValue value(ClassInfo<?> enumType, String enumValue);
+
+    AnnotationAttributeValue value(Class<?> value);
+
+    AnnotationAttributeValue annotationValue(Class<? extends Annotation> annotationType, AnnotationAttribute... attributes);
+
+    AnnotationAttributeValue annotationValue(ClassInfo<?> annotationType, AnnotationAttribute... attributes);
+
+    AnnotationAttributeValue annotationValue(AnnotationInfo annotation);
+
+    AnnotationAttributeValue annotationValue(Annotation annotation);
+
+    AnnotationAttribute attribute(String name, boolean value);
+
+    AnnotationAttribute attribute(String name, byte value);
+
+    AnnotationAttribute attribute(String name, short value);
+
+    AnnotationAttribute attribute(String name, int value);
+
+    AnnotationAttribute attribute(String name, long value);
+
+    AnnotationAttribute attribute(String name, float value);
+
+    AnnotationAttribute attribute(String name, double value);
+
+    AnnotationAttribute attribute(String name, char value);
+
+    AnnotationAttribute attribute(String name, String value);
+
+    AnnotationAttribute attribute(String name, Enum<?> enumValue);
+
+    AnnotationAttribute attribute(String name, Class<? extends Enum<?>> enumType, String enumValue);
+
+    AnnotationAttribute attribute(String name, ClassInfo<?> enumType, String enumValue);
+
+    AnnotationAttribute attribute(String name, Class<?> value);
+
+    AnnotationAttribute arrayAttribute(String name, AnnotationAttributeValue... values);
+
+    AnnotationAttribute arrayAttribute(String name, List<AnnotationAttributeValue> values);
+
+    AnnotationAttribute annotationAttribute(String name, Class<? extends Annotation> annotationType,
+            AnnotationAttribute... attributes);
+
+    AnnotationAttribute annotationAttribute(String name, ClassInfo<?> annotationType, AnnotationAttribute... attributes);
+
+    AnnotationAttribute annotationAttribute(String name, AnnotationInfo annotation);
+
+    AnnotationAttribute annotationAttribute(String name, Annotation annotation);
+}

api/src/main/java/jakarta/enterprise/inject/build/compatible/spi/AppArchive.java

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+package jakarta.enterprise.inject.build.compatible.spi;
+
+import jakarta.enterprise.lang.model.declarations.ClassInfo;
+import jakarta.enterprise.lang.model.declarations.FieldInfo;
+import jakarta.enterprise.lang.model.declarations.MethodInfo;
+import jakarta.enterprise.lang.model.types.Type;
+import java.lang.annotation.Annotation;
+import java.util.function.Consumer;
+
+// TODO remove entirely?
+public interface AppArchive {
+    ClassQuery classes();
+
+    MethodQuery constructors(); // no static initializers
+
+    MethodQuery methods(); // no constructors nor static initializers
+
+    FieldQuery fields();
+
+    /**
+     * The {@code exactly} and {@code subtypeOf} methods are additive.
+     * When called multiple times, they form a union of requested classes (not an intersection).
+     * For example,
+     * <pre>{@code
+     * appArchive.classes()
+     *     .exactly(Foo.class)
+     *     .subtypeOf(Bar.class)
+     *     .forEach(...)
+     * }</pre>
+     * runs given code for the {@code Foo} class and all subtypes of the {@code Bar} class.
+     * <p>
+     * The {@code annotatedWith} methods are additive.
+     * When called multiple times, they form a union of requested annotations (not an intersection).
+     * For example,
+     * <pre>{@code
+     * appArchive.classes()
+     *     .annotatedWith(Foo.class)
+     *     .annotatedWith(Bar.class)
+     *     .forEach(...)
+     * }</pre>
+     * runs given code for all classes annotated either with {@code @Foo} or with {@code @Bar} (or both).
+     */
+    interface ClassQuery {
+        ClassQuery exactly(Class<?> clazz);
+
+        ClassQuery subtypeOf(Class<?> clazz);
+
+        ClassQuery annotatedWith(Class<? extends Annotation> annotationType);
+
+        void forEach(Consumer<ClassInfo<?>> consumer);
+    }
+
+    /**
+     * The {@code declaredOn} method is additive.
+     * When called multiple times, it forms a union of requested classes (not an intersection).
+     * For example,
+     * <pre>{@code
+     * appArchive.methods()
+     *     .declaredOn(appArchive.classes().exactly(Foo.class))
+     *     .declaredOn(appArchive.classes().subtypeOf(Bar.class))
+     *     .forEach(...)
+     * }</pre>
+     * runs given code for all methods declared on the {@code Foo} class and on all subtypes of the {@code Bar} class.
+     * Note that this example can be rewritten as
+     * <pre>{@code
+     * appArchive.methods()
+     *     .declaredOn(appArchive.classes().exactly(Foo.class).subtypeOf(Bar.class))
+     *     .forEach(...)
+     * }</pre>
+     * which is probably easier to understand.
+     * <p>
+     * The {@code withReturnType} methods are additive.
+     * When called multiple times, they form a union of requested return types (not an intersection).
+     * For example,
+     * <pre>{@code
+     * appArchive.methods()
+     *     .withReturnType(Foo.class)
+     *     .withReturnType(Bar.class)
+     *     .forEach(...)
+     * }</pre>
+     * runs given code for all methods that return either {@code Foo} or {@code Bar}.
+     * <p>
+     * The {@code annotatedWith} methods are additive.
+     * When called multiple times, they form a union of requested annotations (not an intersection).
+     * For example,
+     * <pre>{@code
+     * appArchive.methods()
+     *     .annotatedWith(Foo.class)
+     *     .annotatedWith(Bar.class)
+     *     .forEach(...)
+     * }</pre>
+     * runs given code for all methods annotated either with {@code @Foo} or with {@code @Bar} (or both).
+     */
+    interface MethodQuery {
+        MethodQuery declaredOn(ClassQuery classes);
+
+        // equivalent to `withReturnType(Types.of(type))`
+        MethodQuery withReturnType(Class<?> type);
+
+        MethodQuery withReturnType(Type type);
+
+        // TODO parameters?
+
+        MethodQuery annotatedWith(Class<? extends Annotation> annotationType);
+
+        void forEach(Consumer<MethodInfo<?>> consumer);
+    }
+
+    /**
+     * The {@code declaredOn} method is additive.
+     * When called multiple times, it forms a union of requested classes (not an intersection).
+     * For example,
+     * <pre>{@code
+     * appArchive.fields()
+     *     .declaredOn(appArchive.classes().exactly(Foo.class))
+     *     .declaredOn(appArchive.classes().subtypeOf(Bar.class))
+     *     .forEach(...)
+     * }</pre>
+     * runs given code for all fields declared on the {@code Foo} class and on all subtypes of the {@code Bar} class.
+     * Note that this example can be rewritten as
+     * <pre>{@code
+     * appArchive.fields()
+     *     .declaredOn(appArchive.classes().exactly(Foo.class).subtypeOf(Bar.class))
+     *     .forEach()
+     * }</pre>
+     * which is probably easier to understand.
+     * <p>
+     * The {@code ofType} methods are additive.
+     * When called multiple times, they form a union of requested field types (not an intersection).
+     * For example,
+     * <pre>{@code
+     * appArchive.fields()
+     *     .ofType(Foo.class)
+     *     .ofType(Bar.class)
+     *     .forEach()
+     * }</pre>
+     * runs given code for all fields that are of type either {@code Foo} or {@code Bar}.
+     * <p>
+     * The {@code annotatedWith} methods are additive.
+     * When called multiple times, they form a union of requested annotations (not an intersection).
+     * For example,
+     * <pre>{@code
+     * appArchive.fields()
+     *     .annotatedWith(Foo.class)
+     *     .annotatedWith(Bar.class)
+     *     .forEach(...)
+     * }</pre>
+     * runs given code for all fields annotated either with {@code @Foo} or with {@code @Bar} (or both).
+     */
+    interface FieldQuery {
+        FieldQuery declaredOn(ClassQuery classes);
+
+        // equivalent to `withReturnType(Types.of(type))`
+        FieldQuery ofType(Class<?> type);
+
+        FieldQuery ofType(Type type);
+
+        FieldQuery annotatedWith(Class<? extends Annotation> annotationType);
+
+        void forEach(Consumer<FieldInfo<?>> consumer);
+    }
+}

api/src/main/java/jakarta/enterprise/inject/build/compatible/spi/AppArchiveBuilder.java

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+package jakarta.enterprise.inject.build.compatible.spi;
+
+// TODO better name
+public interface AppArchiveBuilder {
+    void add(String fullyQualifiedClassName);
+
+    // TODO adds the type itself or not? (in theory yes, as subtyping is reflexive)
+    // TODO looks like it can't be implemented on top of Portable Extensions, so maybe remove?
+    void addSubtypesOf(String fullyQualifiedClassName);
+}

api/src/main/java/jakarta/enterprise/inject/build/compatible/spi/AppArchiveConfig.java

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+package jakarta.enterprise.inject.build.compatible.spi;
+
+import jakarta.enterprise.lang.model.types.Type;
+import java.lang.annotation.Annotation;
+import java.util.function.Consumer;
+
+// TODO remove entirely, if we remove AppArchive/AppDeployment
+// TODO maybe AppArchiveConfig shouldn't extend AppArchive, and *ConfigQuery shouldn't extend *Query
+public interface AppArchiveConfig extends AppArchive {
+    @Override
+    ClassConfigQuery classes();
+
+    @Override
+    MethodConfigQuery constructors(); // no static initializers
+
+    @Override
+    MethodConfigQuery methods(); // no constructors nor static initializers
+
+    @Override
+    FieldConfigQuery fields();
+
+    interface ClassConfigQuery extends ClassQuery {
+        @Override
+        ClassConfigQuery exactly(Class<?> clazz);
+
+        @Override
+        ClassConfigQuery subtypeOf(Class<?> clazz);
+
+        @Override
+        ClassConfigQuery annotatedWith(Class<? extends Annotation> annotationType);
+
+        void configure(Consumer<ClassConfig<?>> consumer);
+    }
+
+    interface MethodConfigQuery extends MethodQuery {
+        @Override
+        MethodConfigQuery declaredOn(ClassQuery classes);
+
+        @Override
+        MethodConfigQuery withReturnType(Class<?> type);
+
+        @Override
+        MethodConfigQuery withReturnType(Type type);
+
+        @Override
+        MethodConfigQuery annotatedWith(Class<? extends Annotation> annotationType);
+
+        void configure(Consumer<MethodConfig<?>> consumer);
+    }
+
+    interface FieldConfigQuery extends FieldQuery {
+        @Override
+        FieldConfigQuery declaredOn(ClassQuery classes);
+
+        @Override
+        FieldConfigQuery ofType(Class<?> type);
+
+        @Override
+        FieldConfigQuery ofType(Type type);
+
+        @Override
+        FieldConfigQuery annotatedWith(Class<? extends Annotation> annotationType);
+
+        void configure(Consumer<FieldConfig<?>> consumer);
+    }
+}