org.springframework.cloud.function.context.catalog

Class FunctionTypeUtils

java.lang.Object

org.springframework.cloud.function.context.catalog.FunctionTypeUtils

public final class FunctionTypeUtils
extends Object

Set of utility operations to interrogate function definitions.

Since:

3.0

Author:

Oleg Zhurakousky, Andrey Shlykov

Method Summary

Modifier and Type	Method and Description
static String	discoverBeanDefinitionNameByQualifier(org.springframework.beans.factory.ListableBeanFactory beanFactory, String qualifier)
static Method	discoverFunctionalMethod(Class<?> pojoFunctionClass) Will attempt to discover functional methods on the class.
static Type	discoverFunctionType(Object function, String functionName, org.springframework.context.support.GenericApplicationContext applicationContext)
static Type	discoverFunctionTypeFromClass(Class<?> functionalClass)
static Type	discoverFunctionTypeFromFunctionMethod(Method functionMethod)
static Type	getGenericType(Type type) A convenience method identical to getImmediateGenericType(Type, int) for cases when provided 'type' is Publisher or Message.
static Type	getImmediateGenericType(Type type, int index)
static int	getInputCount(Type functionType)
static Type	getInputType(Type functionType) Returns input type of function type that represents Function or Consumer.
static int	getOutputCount(Type functionType)
static Type	getOutputType(Type functionType)
static Class<?>	getRawType(Type type) Effectively converts Type which could be ParameterizedType to raw Class (no generics).
static boolean	isCollectionOfMessage(Type type)
static boolean	isConsumer(Type type)
static boolean	isFlux(Type type)
static boolean	isFunction(Type type)
static boolean	isMessage(Type type)
static boolean	isMono(Type type)
static boolean	isMultipleArgumentType(Type type)
static boolean	isOutputArray(Type functionType) Determines if input argument to a Function is an array.
static boolean	isPublisher(Type type)
static boolean	isSupplier(Type type)
static boolean	isTypeArray(Type type)
static boolean	isTypeCollection(Type type) Will return 'true' if the provided type is a Collection type.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

isTypeCollection

public static boolean isTypeCollection(Type type)

Will return 'true' if the provided type is a Collection type. This also includes collections wrapped in Message. For example, If provided type is Message<List<Foo>> this operation will return 'true'.

Parameters:

type - type to interrogate

Returns:

'true' if this type represents a Collection. Otherwise 'false'.

isTypeArray

public static boolean isTypeArray(Type type)

getGenericType

public static Type getGenericType(Type type)

A convenience method identical to getImmediateGenericType(Type, int) for cases when provided 'type' is Publisher or Message.

Parameters:

type - type to interrogate

Returns:

generic type if possible otherwise the same type as provided

getRawType

public static Class<?> getRawType(Type type)

Effectively converts Type which could be ParameterizedType to raw Class (no generics).

Parameters:

type - actual Type instance

Returns:

instance of Class as raw representation of the provided Type

discoverFunctionalMethod

public static Method discoverFunctionalMethod(Class<?> pojoFunctionClass)

Will attempt to discover functional methods on the class. It's applicable for POJOs as well as functional classes in `java.util.function` package. For the later the names of the methods are well known (`apply`, `accept` and `get`). For the former it will attempt to discover a single method following semantics described in (see FunctionalInterface)

Parameters:

pojoFunctionClass - the class to introspect

Returns:

functional method

discoverFunctionTypeFromClass

public static Type discoverFunctionTypeFromClass(Class<?> functionalClass)

discoverFunctionTypeFromFunctionMethod

public static Type discoverFunctionTypeFromFunctionMethod(Method functionMethod)

getInputCount

public static int getInputCount(Type functionType)

getOutputCount

public static int getOutputCount(Type functionType)

getInputType

public static Type getInputType(Type functionType)

Returns input type of function type that represents Function or Consumer.

Parameters:

functionType - the Type of Function or Consumer

Returns:

the input type as Type

discoverFunctionType

public static Type discoverFunctionType(Object function,
                                        String functionName,
                                        org.springframework.context.support.GenericApplicationContext applicationContext)

discoverBeanDefinitionNameByQualifier

public static String discoverBeanDefinitionNameByQualifier(org.springframework.beans.factory.ListableBeanFactory beanFactory,
                                                           String qualifier)

getOutputType

public static Type getOutputType(Type functionType)

getImmediateGenericType

public static Type getImmediateGenericType(Type type,
                                           int index)

isPublisher

public static boolean isPublisher(Type type)

isFlux

public static boolean isFlux(Type type)

isCollectionOfMessage

public static boolean isCollectionOfMessage(Type type)

isMessage

public static boolean isMessage(Type type)

isOutputArray

public static boolean isOutputArray(Type functionType)

Determines if input argument to a Function is an array.

Parameters:

functionType - the function type

Returns:

true if input type is an array, otherwise false

isSupplier

public static boolean isSupplier(Type type)

isFunction

public static boolean isFunction(Type type)

isConsumer

public static boolean isConsumer(Type type)

isMono

public static boolean isMono(Type type)

isMultipleArgumentType

public static boolean isMultipleArgumentType(Type type)