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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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package sun.reflect.annotation;

import java.lang.annotation.*;
import java.lang.reflect.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.StringJoiner;
import java.util.stream.Stream;
import java.util.stream.Collectors;

import static sun.reflect.annotation.TypeAnnotation.*;

public final class AnnotatedTypeFactory {
    
Create an AnnotatedType.
Params:
  • type – the type this AnnotatedType corresponds to
  • currentLoc – the location this AnnotatedType corresponds to
  • actualTypeAnnos – the type annotations this AnnotatedType has
  • allOnSameTarget – all type annotation on the same TypeAnnotationTarget as the AnnotatedType being built
  • decl – the declaration having the type use this AnnotatedType corresponds to
/** * Create an AnnotatedType. * * @param type the type this AnnotatedType corresponds to * @param currentLoc the location this AnnotatedType corresponds to * @param actualTypeAnnos the type annotations this AnnotatedType has * @param allOnSameTarget all type annotation on the same TypeAnnotationTarget * as the AnnotatedType being built * @param decl the declaration having the type use this AnnotatedType * corresponds to */
public static AnnotatedType buildAnnotatedType(Type type, LocationInfo currentLoc, TypeAnnotation[] actualTypeAnnos, TypeAnnotation[] allOnSameTarget, AnnotatedElement decl) { if (type == null) { return EMPTY_ANNOTATED_TYPE; } if (isArray(type)) return new AnnotatedArrayTypeImpl(type, currentLoc, actualTypeAnnos, allOnSameTarget, decl); if (type instanceof Class) { return new AnnotatedTypeBaseImpl(type, currentLoc, actualTypeAnnos, allOnSameTarget, decl); } else if (type instanceof TypeVariable) { return new AnnotatedTypeVariableImpl((TypeVariable)type, currentLoc, actualTypeAnnos, allOnSameTarget, decl); } else if (type instanceof ParameterizedType) { return new AnnotatedParameterizedTypeImpl((ParameterizedType)type, currentLoc, actualTypeAnnos, allOnSameTarget, decl); } else if (type instanceof WildcardType) { return new AnnotatedWildcardTypeImpl((WildcardType) type, currentLoc, actualTypeAnnos, allOnSameTarget, decl); } throw new AssertionError("Unknown instance of Type: " + type + "\nThis should not happen."); } public static LocationInfo nestingForType(Type type, LocationInfo addTo) { if (isArray(type)) return addTo; if (type instanceof Class) { Class<?> clz = (Class)type; if (clz.getEnclosingClass() == null) return addTo; if (Modifier.isStatic(clz.getModifiers())) return addTo; return nestingForType(clz.getEnclosingClass(), addTo.pushInner()); } else if (type instanceof ParameterizedType) { ParameterizedType t = (ParameterizedType)type; if (t.getOwnerType() == null) return addTo; if (t.getRawType() instanceof Class && Modifier.isStatic(((Class) t.getRawType()).getModifiers())) return addTo; return nestingForType(t.getOwnerType(), addTo.pushInner()); } return addTo; } private static boolean isArray(Type t) { if (t instanceof Class) { Class<?> c = (Class)t; if (c.isArray()) return true; } else if (t instanceof GenericArrayType) { return true; } return false; } static final TypeAnnotation[] EMPTY_TYPE_ANNOTATION_ARRAY = new TypeAnnotation[0]; static final AnnotatedType EMPTY_ANNOTATED_TYPE = new AnnotatedTypeBaseImpl(null, LocationInfo.BASE_LOCATION, EMPTY_TYPE_ANNOTATION_ARRAY, EMPTY_TYPE_ANNOTATION_ARRAY, null); static final AnnotatedType[] EMPTY_ANNOTATED_TYPE_ARRAY = new AnnotatedType[0]; /* * Note that if additional subclasses of AnnotatedTypeBaseImpl are * added, the equals methods of AnnotatedTypeBaseImpl will need to * be updated to properly implement the equals contract. */ private static class AnnotatedTypeBaseImpl implements AnnotatedType { private final Type type; private final AnnotatedElement decl; private final LocationInfo location; private final TypeAnnotation[] allOnSameTargetTypeAnnotations; private final Map<Class <? extends Annotation>, Annotation> annotations; AnnotatedTypeBaseImpl(Type type, LocationInfo location, TypeAnnotation[] actualTypeAnnotations, TypeAnnotation[] allOnSameTargetTypeAnnotations, AnnotatedElement decl) { this.type = type; this.decl = decl; this.location = location; this.allOnSameTargetTypeAnnotations = allOnSameTargetTypeAnnotations; this.annotations = TypeAnnotationParser.mapTypeAnnotations(location.filter(actualTypeAnnotations)); } // AnnotatedElement @Override public final Annotation[] getAnnotations() { return getDeclaredAnnotations(); } @Override public final <T extends Annotation> T getAnnotation(Class<T> annotation) { return getDeclaredAnnotation(annotation); } @Override public final <T extends Annotation> T[] getAnnotationsByType(Class<T> annotation) { return getDeclaredAnnotationsByType(annotation); } @Override public final Annotation[] getDeclaredAnnotations() { return annotations.values().toArray(new Annotation[0]); } @Override @SuppressWarnings("unchecked") public final <T extends Annotation> T getDeclaredAnnotation(Class<T> annotation) { return (T)annotations.get(annotation); } @Override public final <T extends Annotation> T[] getDeclaredAnnotationsByType(Class<T> annotation) { return AnnotationSupport.getDirectlyAndIndirectlyPresent(annotations, annotation); } // AnnotatedType @Override public final Type getType() { return type; } @Override public AnnotatedType getAnnotatedOwnerType() { if (!(type instanceof Class<?>)) throw new IllegalStateException("Can't compute owner"); Class<?> nested = (Class<?>)type; Class<?> owner = nested.getDeclaringClass(); if (owner == null) // top-level, local or anonymous return null; if (nested.isPrimitive() || nested == Void.TYPE) return null; LocationInfo outerLoc = getLocation().popLocation((byte)1); if (outerLoc == null) { return buildAnnotatedType(owner, LocationInfo.BASE_LOCATION, EMPTY_TYPE_ANNOTATION_ARRAY, EMPTY_TYPE_ANNOTATION_ARRAY, getDecl()); } TypeAnnotation[]all = getTypeAnnotations(); List<TypeAnnotation> l = new ArrayList<>(all.length); for (TypeAnnotation t : all) if (t.getLocationInfo().isSameLocationInfo(outerLoc)) l.add(t); return buildAnnotatedType(owner, outerLoc, l.toArray(EMPTY_TYPE_ANNOTATION_ARRAY), all, getDecl()); } @Override // java.lang.Object public String toString() { // Reusable toString implementation, but needs to be // specialized for quirks of arrays and interior types of // wildcards, etc. return annotationsToString(getAnnotations(), false) + ((type instanceof Class) ? type.getTypeName(): type.toString()); } protected String annotationsToString(Annotation[] annotations, boolean leadingSpace) { if (annotations != null && annotations.length > 0) { StringBuffer sb = new StringBuffer(); sb.append(Stream.of(annotations). map(Annotation::toString). collect(Collectors.joining(" "))); if (leadingSpace) sb.insert(0, " "); else sb.append(" "); return sb.toString(); } else { return ""; } } protected boolean equalsTypeAndAnnotations(AnnotatedType that) { return getType().equals(that.getType()) && // Treat ordering of annotations as significant Arrays.equals(getAnnotations(), that.getAnnotations()) && Objects.equals(getAnnotatedOwnerType(), that.getAnnotatedOwnerType()); } int baseHashCode() { return type.hashCode() ^ // Acceptable to use Objects.hash rather than // Arrays.deepHashCode since the elements of the array // are not themselves arrays. Objects.hash((Object[])getAnnotations()) ^ Objects.hash(getAnnotatedOwnerType()); } @Override public boolean equals(Object o) { if (o instanceof AnnotatedType && !(o instanceof AnnotatedArrayType) && !(o instanceof AnnotatedTypeVariable) && !(o instanceof AnnotatedParameterizedType) && !(o instanceof AnnotatedWildcardType)) { AnnotatedType that = (AnnotatedType) o; return equalsTypeAndAnnotations(that); } else { return false; } } @Override public int hashCode() { return baseHashCode(); } // Implementation details final LocationInfo getLocation() { return location; } final TypeAnnotation[] getTypeAnnotations() { return allOnSameTargetTypeAnnotations; } final AnnotatedElement getDecl() { return decl; } } private static final class AnnotatedArrayTypeImpl extends AnnotatedTypeBaseImpl implements AnnotatedArrayType { AnnotatedArrayTypeImpl(Type type, LocationInfo location, TypeAnnotation[] actualTypeAnnotations, TypeAnnotation[] allOnSameTargetTypeAnnotations, AnnotatedElement decl) { super(type, location, actualTypeAnnotations, allOnSameTargetTypeAnnotations, decl); } @Override public AnnotatedType getAnnotatedGenericComponentType() { Type t = getComponentType(); return AnnotatedTypeFactory.buildAnnotatedType(t, nestingForType(t, getLocation().pushArray()), getTypeAnnotations(), getTypeAnnotations(), getDecl()); } @Override public AnnotatedType getAnnotatedOwnerType() { return null; } private Type getComponentType() { Type t = getType(); if (t instanceof Class) { Class<?> c = (Class)t; return c.getComponentType(); } return ((GenericArrayType)t).getGenericComponentType(); } @Override public String toString() { // To annotate the full type of an array, the annotations // are placed between the type and the brackets. For // example, to annotate an array of Strings, the syntax used is // // String @TypeAnnotation [] // // and *not* // // @TypeAnnotation String[]. // // The toString output should strive to be reusable in // source code. Therefore, the general logic of putting // the annotations before a textual representation of the // type need to be overridden for arrays. StringBuilder sb = new StringBuilder(); AnnotatedType componentType = this; while (componentType instanceof AnnotatedArrayType) { AnnotatedArrayType annotatedArrayType = (AnnotatedArrayType) componentType; sb.append(annotationsToString(annotatedArrayType.getAnnotations(), true) + "[]"); componentType = annotatedArrayType.getAnnotatedGenericComponentType(); } sb.insert(0, componentType.toString()); return sb.toString(); } @Override public boolean equals(Object o) { if (o instanceof AnnotatedArrayType) { AnnotatedArrayType that = (AnnotatedArrayType) o; return equalsTypeAndAnnotations(that) && Objects.equals(getAnnotatedGenericComponentType(), that.getAnnotatedGenericComponentType()); } else { return false; } } @Override public int hashCode() { return baseHashCode() ^ getAnnotatedGenericComponentType().hashCode(); } } private static final class AnnotatedTypeVariableImpl extends AnnotatedTypeBaseImpl implements AnnotatedTypeVariable { AnnotatedTypeVariableImpl(TypeVariable<?> type, LocationInfo location, TypeAnnotation[] actualTypeAnnotations, TypeAnnotation[] allOnSameTargetTypeAnnotations, AnnotatedElement decl) { super(type, location, actualTypeAnnotations, allOnSameTargetTypeAnnotations, decl); } @Override public AnnotatedType[] getAnnotatedBounds() { return getTypeVariable().getAnnotatedBounds(); } @Override public AnnotatedType getAnnotatedOwnerType() { return null; } private TypeVariable<?> getTypeVariable() { return (TypeVariable)getType(); } // The declaration of a type variable should // include information about its bounds, etc. However, the // use of a type variable should not. For that reason, it is // acceptable for the toString and hashCode implementations of // AnnotatedTypeVariableImpl to use the inherited // implementations from AnnotatedTypeBaseImpl. @Override public boolean equals(Object o) { if (o instanceof AnnotatedTypeVariable) { AnnotatedTypeVariable that = (AnnotatedTypeVariable) o; return equalsTypeAndAnnotations(that); } else { return false; } } } private static final class AnnotatedParameterizedTypeImpl extends AnnotatedTypeBaseImpl implements AnnotatedParameterizedType { AnnotatedParameterizedTypeImpl(ParameterizedType type, LocationInfo location, TypeAnnotation[] actualTypeAnnotations, TypeAnnotation[] allOnSameTargetTypeAnnotations, AnnotatedElement decl) { super(type, location, actualTypeAnnotations, allOnSameTargetTypeAnnotations, decl); } @Override public AnnotatedType[] getAnnotatedActualTypeArguments() { Type[] arguments = getParameterizedType().getActualTypeArguments(); AnnotatedType[] res = new AnnotatedType[arguments.length]; Arrays.fill(res, EMPTY_ANNOTATED_TYPE); int initialCapacity = getTypeAnnotations().length; for (int i = 0; i < res.length; i++) { List<TypeAnnotation> l = new ArrayList<>(initialCapacity); LocationInfo newLoc = nestingForType(arguments[i], getLocation().pushTypeArg((byte)i)); for (TypeAnnotation t : getTypeAnnotations()) if (t.getLocationInfo().isSameLocationInfo(newLoc)) l.add(t); res[i] = buildAnnotatedType(arguments[i], newLoc, l.toArray(EMPTY_TYPE_ANNOTATION_ARRAY), getTypeAnnotations(), getDecl()); } return res; } @Override public AnnotatedType getAnnotatedOwnerType() { Type owner = getParameterizedType().getOwnerType(); if (owner == null) return null; LocationInfo outerLoc = getLocation().popLocation((byte)1); if (outerLoc == null) { return buildAnnotatedType(owner, LocationInfo.BASE_LOCATION, EMPTY_TYPE_ANNOTATION_ARRAY, EMPTY_TYPE_ANNOTATION_ARRAY, getDecl()); } TypeAnnotation[]all = getTypeAnnotations(); List<TypeAnnotation> l = new ArrayList<>(all.length); for (TypeAnnotation t : all) if (t.getLocationInfo().isSameLocationInfo(outerLoc)) l.add(t); return buildAnnotatedType(owner, outerLoc, l.toArray(EMPTY_TYPE_ANNOTATION_ARRAY), all, getDecl()); } private ParameterizedType getParameterizedType() { return (ParameterizedType)getType(); } @Override public String toString() { StringBuilder sb = new StringBuilder(); sb.append(annotationsToString(getAnnotations(), false)); Type t = getParameterizedType().getRawType(); sb.append(t.getTypeName()); AnnotatedType[] typeArgs = getAnnotatedActualTypeArguments(); if (typeArgs.length > 0) { sb.append(Stream.of(typeArgs).map(AnnotatedType::toString). collect(Collectors.joining(", ", "<", ">"))); } return sb.toString(); } @Override public boolean equals(Object o) { if (o instanceof AnnotatedParameterizedType) { AnnotatedParameterizedType that = (AnnotatedParameterizedType) o; return equalsTypeAndAnnotations(that) && Arrays.equals(getAnnotatedActualTypeArguments(), that.getAnnotatedActualTypeArguments()); } else { return false; } } @Override public int hashCode() { return baseHashCode() ^ Objects.hash((Object[])getAnnotatedActualTypeArguments()); } } private static final class AnnotatedWildcardTypeImpl extends AnnotatedTypeBaseImpl implements AnnotatedWildcardType { private final boolean hasUpperBounds; AnnotatedWildcardTypeImpl(WildcardType type, LocationInfo location, TypeAnnotation[] actualTypeAnnotations, TypeAnnotation[] allOnSameTargetTypeAnnotations, AnnotatedElement decl) { super(type, location, actualTypeAnnotations, allOnSameTargetTypeAnnotations, decl); hasUpperBounds = (type.getLowerBounds().length == 0); } @Override public AnnotatedType[] getAnnotatedUpperBounds() { if (!hasUpperBounds()) { return new AnnotatedType[] { buildAnnotatedType(Object.class, LocationInfo.BASE_LOCATION, EMPTY_TYPE_ANNOTATION_ARRAY, EMPTY_TYPE_ANNOTATION_ARRAY, null) }; } return getAnnotatedBounds(getWildcardType().getUpperBounds()); } @Override public AnnotatedType[] getAnnotatedLowerBounds() { if (hasUpperBounds) return new AnnotatedType[0]; return getAnnotatedBounds(getWildcardType().getLowerBounds()); } @Override public AnnotatedType getAnnotatedOwnerType() { return null; } private AnnotatedType[] getAnnotatedBounds(Type[] bounds) { AnnotatedType[] res = new AnnotatedType[bounds.length]; Arrays.fill(res, EMPTY_ANNOTATED_TYPE); int initialCapacity = getTypeAnnotations().length; for (int i = 0; i < res.length; i++) { LocationInfo newLoc = nestingForType(bounds[i], getLocation().pushWildcard()); List<TypeAnnotation> l = new ArrayList<>(initialCapacity); for (TypeAnnotation t : getTypeAnnotations()) if (t.getLocationInfo().isSameLocationInfo(newLoc)) l.add(t); res[i] = buildAnnotatedType(bounds[i], newLoc, l.toArray(EMPTY_TYPE_ANNOTATION_ARRAY), getTypeAnnotations(), getDecl()); } return res; } private WildcardType getWildcardType() { return (WildcardType)getType(); } private boolean hasUpperBounds() { return hasUpperBounds; } @Override public String toString() { StringBuilder sb = new StringBuilder(); sb.append(annotationsToString(getAnnotations(), false)); sb.append("?"); // Note that the wildcard API is written to accommodate // multiple bounds for wildcards, but at the time of // writing only a single bound is allowed in the // language. AnnotatedType[] bounds = getAnnotatedLowerBounds(); if (bounds.length > 0) { sb.append(" super "); } else { bounds = getAnnotatedUpperBounds(); if (bounds.length > 0) { if (bounds.length == 1) { // Check for and elide " extends java.lang.Object" if a lone // Object bound is not annotated. AnnotatedType bound = bounds[0]; if (bound.getType().equals(Object.class) && bound.getAnnotations().length == 0) { return sb.toString(); } } sb.append(" extends "); } } sb.append(Stream.of(bounds).map(AnnotatedType::toString). collect(Collectors.joining(" & "))); return sb.toString(); } @Override public boolean equals(Object o) { if (o instanceof AnnotatedWildcardType) { AnnotatedWildcardType that = (AnnotatedWildcardType) o; return equalsTypeAndAnnotations(that) && // Treats ordering as significant Arrays.equals(getAnnotatedLowerBounds(), that.getAnnotatedLowerBounds()) && // Treats ordering as significant Arrays.equals(getAnnotatedUpperBounds(), that.getAnnotatedUpperBounds()); } else { return false; } } @Override public int hashCode() { return baseHashCode() ^ Objects.hash((Object[])getAnnotatedLowerBounds()) ^ Objects.hash((Object[])getAnnotatedUpperBounds()); } } }