Examples with UserAggregationFunction org.neo4j.procedure.UserAggregationFunction used on opensource projects

Example 1 with UserAggregationFunction

use of org.neo4j.procedure.UserAggregationFunction in project neo4j by neo4j.

the class ReflectiveProcedureCompiler method compileAggregationFunction.

private CallableUserAggregationFunction compileAggregationFunction(Class<?> definition, MethodHandle constructor, Method method, QualifiedName funcName) throws ProcedureException, IllegalAccessException {
    if (funcName.namespace() == null || funcName.namespace().length == 0) {
        throw new ProcedureException(Status.Procedure.ProcedureRegistrationFailed, "It is not allowed to define functions in the root namespace please use a namespace, e.g. `@UserFunction(\"org.example.com.%s\")", funcName.name());
    }
    //find update and result method
    Method update = null;
    Method result = null;
    Class<?> aggregator = method.getReturnType();
    for (Method m : aggregator.getDeclaredMethods()) {
        if (m.isAnnotationPresent(UserAggregationUpdate.class)) {
            if (update != null) {
                throw new ProcedureException(Status.Procedure.ProcedureRegistrationFailed, "Class '%s' contains multiple methods annotated with '@%s'.", aggregator.getSimpleName(), UserAggregationUpdate.class.getSimpleName());
            }
            update = m;
        }
        if (m.isAnnotationPresent(UserAggregationResult.class)) {
            if (result != null) {
                throw new ProcedureException(Status.Procedure.ProcedureRegistrationFailed, "Class '%s' contains multiple methods annotated with '@%s'.", aggregator.getSimpleName(), UserAggregationResult.class.getSimpleName());
            }
            result = m;
        }
    }
    if (result == null || update == null) {
        throw new ProcedureException(Status.Procedure.ProcedureRegistrationFailed, "Class '%s' must contain methods annotated with both '@%s' as well as '@%s'.", aggregator.getSimpleName(), UserAggregationResult.class.getSimpleName(), UserAggregationUpdate.class.getSimpleName());
    }
    if (update.getReturnType() != void.class) {
        throw new ProcedureException(Status.Procedure.ProcedureRegistrationFailed, "Update method '%s' in %s has type '%s' but must have return type 'void'.", update.getName(), aggregator.getSimpleName(), update.getReturnType().getSimpleName());
    }
    if (!Modifier.isPublic(method.getModifiers())) {
        throw new ProcedureException(Status.Procedure.ProcedureRegistrationFailed, "Aggregation method '%s' in %s must be public.", method.getName(), definition.getSimpleName());
    }
    if (!Modifier.isPublic(aggregator.getModifiers())) {
        throw new ProcedureException(Status.Procedure.ProcedureRegistrationFailed, "Aggregation class '%s' must be public.", aggregator.getSimpleName());
    }
    if (!Modifier.isPublic(update.getModifiers())) {
        throw new ProcedureException(Status.Procedure.ProcedureRegistrationFailed, "Aggregation update method '%s' in %s must be public.", method.getName(), aggregator.getSimpleName());
    }
    if (!Modifier.isPublic(result.getModifiers())) {
        throw new ProcedureException(Status.Procedure.ProcedureRegistrationFailed, "Aggregation result method '%s' in %s must be public.", method.getName(), aggregator.getSimpleName());
    }
    List<FieldSignature> inputSignature = inputSignatureDeterminer.signatureFor(update);
    Class<?> returnType = result.getReturnType();
    TypeMappers.NeoValueConverter valueConverter = typeMappers.converterFor(returnType);
    MethodHandle creator = lookup.unreflect(method);
    MethodHandle updateMethod = lookup.unreflect(update);
    MethodHandle resultMethod = lookup.unreflect(result);
    Optional<String> description = description(method);
    UserAggregationFunction function = method.getAnnotation(UserAggregationFunction.class);
    Optional<String> deprecated = deprecated(method, function::deprecatedBy, "Use of @UserAggregationFunction(deprecatedBy) without @Deprecated in " + funcName);
    List<FieldInjections.FieldSetter> setters = allFieldInjections.setters(definition);
    if (!config.fullAccessFor(funcName.toString())) {
        try {
            setters = safeFieldInjections.setters(definition);
        } catch (ComponentInjectionException e) {
            description = Optional.of(funcName.toString() + " is not available due to having restricted access rights, check configuration.");
            log.warn(description.get());
            UserFunctionSignature signature = new UserFunctionSignature(funcName, inputSignature, valueConverter.type(), deprecated, config.rolesFor(funcName.toString()), description);
            return new FailedLoadAggregatedFunction(signature);
        }
    }
    UserFunctionSignature signature = new UserFunctionSignature(funcName, inputSignature, valueConverter.type(), deprecated, config.rolesFor(funcName.toString()), description);
    return new ReflectiveUserAggregationFunction(signature, constructor, creator, updateMethod, resultMethod, valueConverter, setters);
}