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add reflection lib and clean reflection bugs
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7 changes: 4 additions & 3 deletions
7
src/main/java/ru/objectsfill/utils/ScanningForClassUtils.java
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35 changes: 35 additions & 0 deletions
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src/main/java/ru/objectsfill/utils/reflection/Configuration.java
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| package ru.objectsfill.utils.reflection; | ||
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| import ru.objectsfill.utils.reflection.scanners.Scanner; | ||
| import ru.objectsfill.utils.reflection.util.ConfigurationBuilder; | ||
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| import java.net.URL; | ||
| import java.util.Map; | ||
| import java.util.Set; | ||
| import java.util.function.Predicate; | ||
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| /** | ||
| * Configuration is used to create a configured instance of {@link Reflections} | ||
| * <p>it is preferred to use {@link ConfigurationBuilder} | ||
| */ | ||
| public interface Configuration { | ||
| /** the scanner instances used for indexing metadata. defaults to {@code SubTypes} and {@code TypesAnnotated}. */ | ||
| Set<Scanner> getScanners(); | ||
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| /** the urls to be scanned. required. */ | ||
| Set<URL> getUrls(); | ||
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| /** the fully qualified name filter used to filter types to be scanned. defaults to accept all inputs (if null). */ | ||
| Predicate<String> getInputsFilter(); | ||
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| /** scan urls in parallel. defaults to true. */ | ||
| boolean isParallel(); | ||
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| /** optional class loaders used for resolving types. */ | ||
| ClassLoader[] getClassLoaders(); | ||
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| /** if true (default), expand super types after scanning, for super types that were not scanned. | ||
| * <p>see {@link Reflections#expandSuperTypes(Map, Map)}*/ | ||
| boolean shouldExpandSuperTypes(); | ||
| } |
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src/main/java/ru/objectsfill/utils/reflection/ReflectionUtils.java
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| package ru.objectsfill.utils.reflection; | ||
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| import ru.objectsfill.utils.reflection.util.ClasspathHelper; | ||
| import ru.objectsfill.utils.reflection.util.QueryFunction; | ||
| import ru.objectsfill.utils.reflection.util.ReflectionUtilsPredicates; | ||
| import ru.objectsfill.utils.reflection.util.UtilQueryBuilder; | ||
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| import java.lang.annotation.Annotation; | ||
| import java.lang.reflect.AnnotatedElement; | ||
| import java.lang.reflect.Constructor; | ||
| import java.lang.reflect.Field; | ||
| import java.lang.reflect.Method; | ||
| import java.lang.reflect.Proxy; | ||
| import java.net.URL; | ||
| import java.util.Arrays; | ||
| import java.util.Collections; | ||
| import java.util.HashSet; | ||
| import java.util.LinkedHashSet; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.Set; | ||
| import java.util.function.Predicate; | ||
| import java.util.stream.Collectors; | ||
| import java.util.stream.Stream; | ||
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| import static java.util.stream.Collectors.toList; | ||
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| /** | ||
| * utils for querying java reflection meta types | ||
| * <p>see {@link #SuperTypes}, {@link #Annotations}, {@link #AnnotationTypes}, {@link #Methods}, {@link #Constructors} and {@link #Fields}. | ||
| * <pre>{@code | ||
| * Set<Class<?>> supertypes = get(SuperTypes.of(type)) | ||
| * Set<Annotation> annotations = get(Annotations.of(type)) | ||
| * }</pre> | ||
| * <p>generally, apply {@link #get(QueryFunction)} on {@link QueryFunction} created by {@link UtilQueryBuilder}, and optionally use the functional methods in QueryFunction. | ||
| * <pre>{@code get(Methods.of(type) | ||
| * .filter(withPublic().and(withPrefix("get")).and(withParameterCount(0))) | ||
| * .as(Method.class) | ||
| * .map(m -> ...)) | ||
| * }</pre> | ||
| * <p>or (previously), use {@code getAllXXX(type/s, withYYY)} methods: | ||
| * <pre>{@code getAllSuperTypes(), getAllFields(), getAllMethods(), getAllConstructors() } | ||
| * </pre> | ||
| * <p> | ||
| * some predicates included here: | ||
| * <ul> | ||
| * <li>{@link #withPublic()} | ||
| * <li>{@link #withParametersCount(int)}} | ||
| * <li>{@link #withAnnotation(Annotation)} | ||
| * <li>{@link #withParameters(Class[])} | ||
| * <li>{@link #withModifier(int)} | ||
| * <li>{@link #withReturnType(Class)} | ||
| * </ul> | ||
| * <pre>{@code | ||
| * import static org.reflections.ReflectionUtils.*; | ||
| * | ||
| * Set<Method> getters = | ||
| * get(Methods(classes) | ||
| * .filter(withModifier(Modifier.PUBLIC).and(withPrefix("get")).and(withParametersCount(0))); | ||
| * | ||
| * get(Annotations.of(method) | ||
| * .filter(withAnnotation()) | ||
| * .map(annotation -> Methods.of(annotation) | ||
| * .map(method -> ))))) | ||
| * .stream()... | ||
| * }</pre> | ||
| * */ | ||
| @SuppressWarnings({"unchecked", "rawtypes"}) | ||
| public abstract class ReflectionUtils extends ReflectionUtilsPredicates { | ||
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| /** get type elements {@code <T>} by applying {@link QueryFunction} <pre>{@code get(SuperTypes.of(type))}</pre> */ | ||
| public static <C, T> Set<T> get(QueryFunction<C, T> function) { | ||
| return function.apply(null); | ||
| } | ||
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| /** get type elements {@code <T>} by applying {@link QueryFunction} and {@code predicates} */ | ||
| public static <T> Set<T> get(QueryFunction<Store, T> queryFunction, Predicate<? super T>... predicates) { | ||
| return get(queryFunction.filter(Arrays.stream((Predicate[]) predicates).reduce(t -> true, Predicate::and))); | ||
| } | ||
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| private static final List<String> objectMethodNames = | ||
| Arrays.asList("equals", "hashCode", "toString", "wait", "notify", "notifyAll"); | ||
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| /** predicate to filter out {@code Object} methods */ | ||
| public static final Predicate<Method> notObjectMethod = m -> !objectMethodNames.contains(m.getName()); | ||
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| /** query super class <pre>{@code get(SuperClass.of(element)) -> Set<Class<?>>}</pre> | ||
| * <p>see also {@link ReflectionUtils#SuperTypes}, {@link ReflectionUtils#Interfaces} */ | ||
| public static final UtilQueryBuilder<Class<?>, Class<?>> SuperClass = | ||
| element -> ctx -> { | ||
| Class<?> superclass = element.getSuperclass(); | ||
| return superclass != null && !superclass.equals(Object.class) ? Collections.singleton(superclass) : Collections.emptySet(); | ||
| }; | ||
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| /** query interfaces <pre>{@code get(Interfaces.of(element)) -> Set<Class<?>>}</pre> */ | ||
| public static final UtilQueryBuilder<Class<?>, Class<?>> Interfaces = | ||
| element -> ctx -> Stream.of(element.getInterfaces()).collect(Collectors.toCollection(LinkedHashSet::new)); | ||
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| /** query super classes and interfaces including element <pre>{@code get(SuperTypes.of(element)) -> Set<Class<?>> }</pre> */ | ||
| public static final UtilQueryBuilder<Class<?>, Class<?>> SuperTypes = | ||
| new UtilQueryBuilder<Class<?>, Class<?>>() { | ||
| @Override | ||
| public QueryFunction<Store, Class<?>> get(Class<?> element) { | ||
| return SuperClass.get(element).add(Interfaces.get(element)); | ||
| } | ||
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| @Override | ||
| public QueryFunction<Store, Class<?>> of(Class<?> element) { | ||
| return QueryFunction.<Store, Class<?>>single(element).getAll(SuperTypes::get); | ||
| } | ||
| }; | ||
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| /** query annotations <pre>{@code get(Annotation.of(element)) -> Set<Annotation> }</pre> */ | ||
| public static final UtilQueryBuilder<AnnotatedElement, Annotation> Annotations = | ||
| new UtilQueryBuilder<AnnotatedElement, Annotation>() { | ||
| @Override | ||
| public QueryFunction<Store, Annotation> get(AnnotatedElement element) { | ||
| return ctx -> Arrays.stream(element.getAnnotations()).collect(Collectors.toCollection(LinkedHashSet::new)); | ||
| } | ||
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| @Override | ||
| public QueryFunction<Store, Annotation> of(AnnotatedElement element) { | ||
| return ReflectionUtils.extendType().get(element).getAll(Annotations::get, Annotation::annotationType); | ||
| } | ||
| }; | ||
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| /** query annotation types <pre>{@code get(AnnotationTypes.of(element)) -> Set<Class<? extends Annotation>> }</pre> */ | ||
| public static final UtilQueryBuilder<AnnotatedElement, Class<? extends Annotation>> AnnotationTypes = | ||
| new UtilQueryBuilder<AnnotatedElement, Class<? extends Annotation>>() { | ||
| @Override | ||
| public QueryFunction<Store, Class<? extends Annotation>> get(AnnotatedElement element) { | ||
| return Annotations.get(element).map(Annotation::annotationType); | ||
| } | ||
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| @Override | ||
| public QueryFunction<Store, Class<? extends Annotation>> of(AnnotatedElement element) { | ||
| return ReflectionUtils.extendType().get(element).getAll(AnnotationTypes::get, a -> a); | ||
| } | ||
| }; | ||
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| /** query methods <pre>{@code get(Methods.of(type)) -> Set<Method>}</pre> */ | ||
| public static final UtilQueryBuilder<Class<?>, Method> Methods = | ||
| element -> ctx -> Arrays.stream(element.getDeclaredMethods()).filter(notObjectMethod).collect(Collectors.toCollection(LinkedHashSet::new)); | ||
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| /** query constructors <pre>{@code get(Constructors.of(type)) -> Set<Constructor> }</pre> */ | ||
| public static final UtilQueryBuilder<Class<?>, Constructor> Constructors = | ||
| element -> ctx -> Arrays.<Constructor>stream(element.getDeclaredConstructors()).collect(Collectors.toCollection(LinkedHashSet::new)); | ||
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| /** query fields <pre>{@code get(Fields.of(type)) -> Set<Field> }</pre> */ | ||
| public static final UtilQueryBuilder<Class<?>, Field> Fields = | ||
| element -> ctx -> Arrays.stream(element.getDeclaredFields()).collect(Collectors.toCollection(LinkedHashSet::new)); | ||
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| /** query url resources using {@link ClassLoader#getResources(String)} <pre>{@code get(Resources.with(name)) -> Set<URL> }</pre> */ | ||
| public static final UtilQueryBuilder<String, URL> Resources = | ||
| element -> ctx -> new HashSet<>(ClasspathHelper.forResource(element)); | ||
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| public static <T extends AnnotatedElement> UtilQueryBuilder<AnnotatedElement, T> extendType() { | ||
| return element -> { | ||
| if (element instanceof Class && !((Class<?>) element).isAnnotation()) { | ||
| QueryFunction<Store, Class<?>> single = QueryFunction.single((Class<?>) element); | ||
| return (QueryFunction<Store, T>) single.add(single.getAll(SuperTypes::get)); | ||
| } else { | ||
| return QueryFunction.single((T) element); | ||
| } | ||
| }; | ||
| } | ||
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| /** get all annotations of given {@code type}, up the super class hierarchy, optionally filtered by {@code predicates} | ||
| * <p>marked for removal, use instead {@code get(Annotations.of())} */ | ||
| public static <T extends AnnotatedElement> Set<Annotation> getAllAnnotations(T type, Predicate<Annotation>... predicates) { | ||
| return get(Annotations.of(type), predicates); | ||
| } | ||
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| /** get all super types of given {@code type}, including, optionally filtered by {@code predicates} */ | ||
| public static Set<Class<?>> getAllSuperTypes(final Class<?> type, Predicate<? super Class<?>>... predicates) { | ||
| Predicate<? super Class<?>>[] filter = predicates == null || predicates.length == 0 ? new Predicate[]{t -> !Object.class.equals(t)} : predicates; | ||
| return get(SuperTypes.of(type), filter); | ||
| } | ||
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| /** get the immediate supertype and interfaces of the given {@code type} | ||
| * <p>marked for removal, use instead {@code get(SuperTypes.get())} */ | ||
| public static Set<Class<?>> getSuperTypes(Class<?> type) { | ||
| return get(SuperTypes.get(type)); | ||
| } | ||
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| /** get all methods of given {@code type}, up the super class hierarchy, optionally filtered by {@code predicates} | ||
| * <p>marked for removal, use instead {@code get(Methods.of())} */ | ||
| public static Set<Method> getAllMethods(final Class<?> type, Predicate<? super Method>... predicates) { | ||
| return get(Methods.of(type), predicates); | ||
| } | ||
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| /** get methods of given {@code type}, optionally filtered by {@code predicates} | ||
| * <p>marked for removal, use instead {@code get(Methods.get())} */ | ||
| public static Set<Method> getMethods(Class<?> t, Predicate<? super Method>... predicates) { | ||
| return get(Methods.get(t), predicates); | ||
| } | ||
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| /** get all constructors of given {@code type}, up the super class hierarchy, optionally filtered by {@code predicates} | ||
| * <p>marked for removal, use instead {@code get(Constructors.of())} */ | ||
| public static Set<Constructor> getAllConstructors(final Class<?> type, Predicate<? super Constructor>... predicates) { | ||
| return get(Constructors.of(type), predicates); | ||
| } | ||
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| /** get constructors of given {@code type}, optionally filtered by {@code predicates} | ||
| * <p>marked for removal, use instead {@code get(Constructors.get())} */ | ||
| public static Set<Constructor> getConstructors(Class<?> t, Predicate<? super Constructor>... predicates) { | ||
| return get(Constructors.get(t), predicates); | ||
| } | ||
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| /** get all fields of given {@code type}, up the super class hierarchy, optionally filtered by {@code predicates} | ||
| * <p>marked for removal, use instead {@code get(Fields.of())} */ | ||
| public static Set<Field> getAllFields(final Class<?> type, Predicate<? super Field>... predicates) { | ||
| return get(Fields.of(type), predicates); | ||
| } | ||
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| /** get fields of given {@code type}, optionally filtered by {@code predicates} | ||
| * <p>marked for removal, use instead {@code get(Fields.get())} */ | ||
| public static Set<Field> getFields(Class<?> type, Predicate<? super Field>... predicates) { | ||
| return get(Fields.get(type), predicates); | ||
| } | ||
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| /** get annotations of given {@code type}, optionally honorInherited, optionally filtered by {@code predicates} | ||
| * <p>marked for removal, use instead {@code get(Annotations.get())} */ | ||
| public static <T extends AnnotatedElement> Set<Annotation> getAnnotations(T type, Predicate<Annotation>... predicates) { | ||
| return get(Annotations.get(type), predicates); | ||
| } | ||
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| /** map {@code annotation} to hash map of member values recursively <pre>{@code Annotations.of(type).map(ReflectionUtils::toMap)} </pre>*/ | ||
| public static Map<String, Object> toMap(Annotation annotation) { | ||
| return get(Methods.of(annotation.annotationType()) | ||
| .filter(notObjectMethod.and(withParametersCount(0)))) | ||
| .stream() | ||
| .collect(Collectors.toMap(Method::getName, m -> { | ||
| Object v1 = invoke(m, annotation); | ||
| return v1.getClass().isArray() && v1.getClass().getComponentType().isAnnotation() ? | ||
| Stream.of((Annotation[]) v1).map(ReflectionUtils::toMap).collect(toList()) : v1; | ||
| })); | ||
| } | ||
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| /** map {@code annotation} and {@code annotatedElement} to hash map of member values | ||
| * <pre>{@code Annotations.of(type).map(a -> toMap(type, a))} </pre>*/ | ||
| public static Map<String, Object> toMap(Annotation annotation, AnnotatedElement element) { | ||
| Map<String, Object> map = toMap(annotation); | ||
| if (element != null) map.put("annotatedElement", element); | ||
| return map; | ||
| } | ||
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| /** create new annotation proxy with member values from the given {@code map} <pre>{@code toAnnotation(Map.of("annotationType", annotationType, "value", ""))}</pre> */ | ||
| public static Annotation toAnnotation(Map<String, Object> map) { | ||
| return toAnnotation(map, (Class<? extends Annotation>) map.get("annotationType")); | ||
| } | ||
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| /** create new annotation proxy with member values from the given {@code map} and member values from the given {@code map} | ||
| * <pre>{@code toAnnotation(Map.of("value", ""), annotationType)}</pre> */ | ||
| public static <T extends Annotation> T toAnnotation(Map<String, Object> map, Class<T> annotationType) { | ||
| return (T) Proxy.newProxyInstance(annotationType.getClassLoader(), new Class<?>[]{annotationType}, | ||
| (proxy, method, args) -> notObjectMethod.test(method) ? map.get(method.getName()) : method.invoke(map)); | ||
| } | ||
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| /** invoke the given {@code method} with {@code args}, return either the result or an exception if occurred */ | ||
| public static Object invoke(Method method, Object obj, Object... args) { | ||
| try { | ||
| return method.invoke(obj, args); | ||
| } catch (Exception e) { | ||
| return e; | ||
| } | ||
| } | ||
| } |
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