java.lang.reflect.AccessibleObject#getAnnotation ( )源码实例Demo

@Nullable
private static AccessibleObject getAnnotation(Class<?> clazz) {
	Set<AccessibleObject> accessibleObjects = new HashSet<>();
	// JsonValue METHOD, FIELD
	Field[] fields = clazz.getDeclaredFields();
	Collections.addAll(accessibleObjects, fields);
	// methods
	Method[] methods = clazz.getDeclaredMethods();
	Collections.addAll(accessibleObjects, methods);
	for (AccessibleObject accessibleObject : accessibleObjects) {
		// 复用 jackson 的 JsonValue 注解
		JsonValue jsonValue = accessibleObject.getAnnotation(JsonValue.class);
		if (jsonValue != null && jsonValue.value()) {
			accessibleObject.setAccessible(true);
			return accessibleObject;
		}
	}
	return null;
}
 

public AbstractAssociationModel( AccessibleObject accessor,
                                 ValueConstraintsInstance valueConstraintsInstance,
                                 ValueConstraintsInstance associationConstraintsInstance,
                                 MetaInfo metaInfo )
{
    Objects.requireNonNull( accessor );
    Objects.requireNonNull( metaInfo );
    this.metaInfo = metaInfo;
    this.constraints = valueConstraintsInstance;
    this.associationConstraints = associationConstraintsInstance;
    this.accessor = accessor;
    this.type = GenericAssociationInfo.associationTypeOf( accessor );
    this.qualifiedName = QualifiedName.fromAccessor( accessor );
    this.immutable = metaInfo.get( Immutable.class ) != null;
    this.aggregated = metaInfo.get( Aggregated.class ) != null;

    Queryable queryable = accessor.getAnnotation( Queryable.class );
    this.queryable = queryable == null || queryable.value();
}
 

@Nullable
private static AccessibleObject getAnnotation(Class<?> clazz) {
	Set<AccessibleObject> accessibleObjects = new HashSet<>();
	// JsonValue METHOD, FIELD
	Field[] fields = clazz.getDeclaredFields();
	Collections.addAll(accessibleObjects, fields);
	// methods
	Method[] methods = clazz.getDeclaredMethods();
	Collections.addAll(accessibleObjects, methods);
	for (AccessibleObject accessibleObject : accessibleObjects) {
		// 复用 jackson 的 JsonValue 注解
		JsonValue jsonValue = accessibleObject.getAnnotation(JsonValue.class);
		if (jsonValue != null && jsonValue.value()) {
			accessibleObject.setAccessible(true);
			return accessibleObject;
		}
	}
	return null;
}
 

/**
 * Verify that the provided accessor method has not been marked with a Queryable(false).
 *
 * @param accessor accessor method
 *
 * @throws NotQueryableException - If accessor method has been marked as not queryable
 */
public static void throwIfNotQueryable( final AccessibleObject accessor )
{
    Queryable queryable = accessor.getAnnotation( Queryable.class );
    if( queryable != null && !queryable.value() )
    {
        throw new NotQueryableException(
            String.format(
                "%1$s \"%2$s\" (%3$s) is not queryable as has been marked with @Queryable(false)",
                Classes.RAW_CLASS.apply( GenericPropertyInfo.propertyTypeOf( accessor ) ).getSimpleName(),
                ( (Member) accessor ).getName(),
                ( (Member) accessor ).getDeclaringClass().getName()
            )
        );
    }
}
 

/**
 * Persists the information that a property is restricted to have all values from a specified set of classes.
 * All properties with {@link AllValuesFrom} annotation are considered.
 * @param annotatedObjects The {@link Iri} annotated objects that should be considered.
 * @throws RepositoryException Thrown on error regarding the connected triplestore.
 */
private void persistAllValuesFrom(Collection<AccessibleObject> annotatedObjects) throws RepositoryException {
    // Get those methods and fields that have the @AllValuesFrom annotation:
    Collection<AccessibleObject> allValuesFromObjects = filterObjectsWithAnnotation(annotatedObjects, AllValuesFrom.class);

    for (AccessibleObject object : allValuesFromObjects) {
        // Get the IRIs of the classes defined in the annotation:
        AllValuesFrom allValuesFrom = object.getAnnotation(AllValuesFrom.class);
        Set<String> clazzIris = getIrisFromObjects(Arrays.asList(allValuesFrom.value()));

        Set<OWLClazz> clazzes = new HashSet<>();
        for (String clazzIri : clazzIris) {
            clazzes.add(createClazzOnDemand(clazzIri));
        }

        // Add the classes to the restriction:
        Restriction restriction = buildRestrictionForProperty(object, null);
        restriction.setAllValuesFrom(clazzes);
    }
}
 

public void test_getAnnotation() throws Exception{
    AccessibleObject ao = SubTestClass.class.getMethod("annotatedMethod");
    //test error case
    boolean npeThrown = false;
    try {
      ao.getAnnotation(null);
      fail("NPE expected");
    } catch (NullPointerException e) {
        npeThrown = true;
    }
    assertTrue("NPE expected", npeThrown);

    //test inherited on method has no effect
    InheritedRuntime ir = ao.getAnnotation(InheritedRuntime.class);
    assertNull("Inherited Annotations should have no effect", ir);

    //test ordinary runtime annotation
    AnnotationRuntime0 rt0 = ao.getAnnotation(AnnotationRuntime0.class);
    assertNotNull("AnnotationRuntime0 instance expected", rt0);
}
 

/**
 * Constructs a SPARQL VALUES clause for successive binding of the given objects {@link Iri} mappings,
 * to the SPARQL variable <code>binding</code>.
 * The IRIs of the resources are enclosed in <code>&lt;&gt;</code> brackets.
 * @param objects The values to successively bind.
 * @param binding The name of the binding without a leading <code>"?"</code>.
 * @return Returns a SPARQL VALUES clause with the given resources and binding.
 */
private String buildValuesClause(Collection<AccessibleObject> objects, String binding) {
    StringBuilder clause = new StringBuilder("VALUES ?")
            .append(binding)
            .append(" {");

    for (AccessibleObject object : objects) {
        if(object.isAnnotationPresent(Iri.class)) {
            Iri iri = object.getAnnotation(Iri.class);

            clause.append(" <")
                    .append(iri.value())
                    .append("> ");
        }
    }
    clause.append("}");

    return clause.toString();
}
 

/**
 * Retrieves cascade from metamodel attribute on a xToMany relation.
 *
 * @param attribute given singular attribute
 * @return an empty collection if no jpa relation annotation can be found.
 */
public Collection<CascadeType> getCascades(SingularAttribute<?, ?> attribute) {
    if (attribute.getJavaMember() instanceof AccessibleObject) {
        AccessibleObject accessibleObject = (AccessibleObject) attribute.getJavaMember();
        OneToOne oneToOne = accessibleObject.getAnnotation(OneToOne.class);
        if (oneToOne != null) {
            return newArrayList(oneToOne.cascade());
        }
        ManyToOne manyToOne = accessibleObject.getAnnotation(ManyToOne.class);
        if (manyToOne != null) {
            return newArrayList(manyToOne.cascade());
        }
    }
    return newArrayList();
}
 

/**
 * Retrieves cascade from metamodel attribute
 *
 * @param attribute given pluaral attribute
 * @return an empty collection if no jpa relation annotation can be found.
 */
public Collection<CascadeType> getCascades(PluralAttribute<?, ?, ?> attribute) {
    if (attribute.getJavaMember() instanceof AccessibleObject) {
        AccessibleObject accessibleObject = (AccessibleObject) attribute.getJavaMember();
        OneToMany oneToMany = accessibleObject.getAnnotation(OneToMany.class);
        if (oneToMany != null) {
            return newArrayList(oneToMany.cascade());
        }
        ManyToMany manyToMany = accessibleObject.getAnnotation(ManyToMany.class);
        if (manyToMany != null) {
            return newArrayList(manyToMany.cascade());
        }
    }
    return newArrayList();
}
 

private static String annotatedName(AccessibleObject obj) {
  if (obj.isAnnotationPresent(PropertyName.class)) {
    PropertyName annotation = obj.getAnnotation(PropertyName.class);
    return annotation.value();
  }

  return null;
}
 

/**
 * Persists the information that a property is a subproperty of another to the default graph of the connected triplestore.
 * All properties with {@link SubPropertyOf} annotation are considered.
 * @param annotatedObjects The {@link Iri} annotated objects that should be considered.
 * @throws RepositoryException Thrown on error regarding the connected triplestore.
 * @throws UpdateExecutionException Thrown if an error occurred while executing the update.
 */
private void persistSubPropertyOf(Collection<AccessibleObject> annotatedObjects) throws RepositoryException, UpdateExecutionException {
    // Get those methods and fields that have the @Transitive annotation:
    Collection<AccessibleObject> subPropertyObjects = filterObjectsWithAnnotation(annotatedObjects, SubPropertyOf.class);

    for (AccessibleObject object : subPropertyObjects) {
        String iri = getIriFromObject(object);

        SubPropertyOf subPropertyAnnotation = object.getAnnotation(SubPropertyOf.class);

        StringBuilder query = new StringBuilder(QUERY_PREFIX)
                                .append(" INSERT DATA { ");
        for (String superPropertyIri : subPropertyAnnotation.value()) {
            query.append("<").append(iri).append("> ")
                 .append("<").append(RDFS.SUB_PROPERTY_OF).append("> ")
                 .append("<").append(superPropertyIri).append("> . ");
        }
        query.append("}");

        // Prepare the update query and execute it:
        try {
            Update update = getConnection().prepareUpdate(query.toString());
            update.execute();
        } catch (MalformedQueryException e) {
            throw new UpdateExecutionException();
        }
    }
}
 

private static String annotatedName(AccessibleObject obj) {
  if (obj.isAnnotationPresent(PropertyName.class)) {
    PropertyName annotation = obj.getAnnotation(PropertyName.class);
    return annotation.value();
  }

  return null;
}
 

public PropertyModel( AccessibleObject accessor,
                      boolean immutable,
                      boolean useDefaults,
                      ValueConstraintsInstance constraints,
                      MetaInfo metaInfo,
                      Object initialValue
                    )
{
    if( accessor instanceof Method )
    {
        Method m = (Method) accessor;
        if( !m.getReturnType().equals( Property.class ) )
        {
            throw new InvalidPropertyTypeException( accessor );
        }
    }
    this.immutable = immutable;
    this.metaInfo = metaInfo;
    this.accessor = accessor;
    type = GenericPropertyInfo.propertyTypeOf( accessor );
    checkTypeValidity( type );
    qualifiedName = QualifiedName.fromAccessor( accessor );
    initialValueProvider = new DefaultInitialValueProvider( useDefaults, initialValue );
    this.constraints = constraints;
    final Queryable queryable = accessor.getAnnotation( Queryable.class );
    this.queryable = queryable == null || queryable.value();
}
 

/**
 * Equivalent to {@link AccessibleObject#isAnnotationPresent(Class)} but handles uimaFIT legacy
 * annotations.
 * 
 * @param aObject
 *          the object to analyze
 * @param aAnnotationClass
 *          the annotation to check for
 * @return whether the annotation is present
 */
public static boolean isAnnotationPresent(AccessibleObject aObject,
        Class<? extends Annotation> aAnnotationClass) {
  // First check if the desired annotation is present
  // UIMA-3853 workaround for IBM Java 8 beta 3
  if (aObject.getAnnotation(aAnnotationClass) != null) {
    return true;
  }
  
  // If not present, check if an equivalent legacy annotation is present
  return LegacySupport.getInstance().isAnnotationPresent(aObject, aAnnotationClass);
}
 

public boolean isOrphanRemoval(PluralAttribute<?, ?, ?> attribute) {
    if (attribute.getJavaMember() instanceof AccessibleObject) {
        AccessibleObject accessibleObject = (AccessibleObject) attribute.getJavaMember();
        OneToMany oneToMany = accessibleObject.getAnnotation(OneToMany.class);
        if (oneToMany != null) {
            return oneToMany.orphanRemoval();
        }
    }
    return true;
}
 

private static String getColumnName(AccessibleObject ao, String defaultName) {
	Column col = ao.getAnnotation(Column.class);
	if (col == null || col.name().isEmpty()) {
		return defaultName;
	}
	return col.name();
}
 

@Override
boolean isCallerSensitive(final AccessibleObject ao) {
    return ao.getAnnotation(CALLER_SENSITIVE_ANNOTATION_CLASS) != null;
}
 

@Override
boolean isCallerSensitive(final AccessibleObject ao) {
    return ao.getAnnotation(CALLER_SENSITIVE_ANNOTATION_CLASS) != null;
}
 

@Override
boolean isCallerSensitive(final AccessibleObject ao) {
    return ao.getAnnotation(CALLER_SENSITIVE_ANNOTATION_CLASS) != null;
}
 

@Override
boolean isCallerSensitive(AccessibleObject ao) {
    return ao.getAnnotation(CALLER_SENSITIVE_ANNOTATION_CLASS) != null;
}