Package org.springframework.batch.support

Class MethodInvokerUtils

java.lang.Object

org.springframework.batch.support.MethodInvokerUtils

public class MethodInvokerUtils
extends Object

Utility methods for create MethodInvoker instances.

Since:

2.0

Author:

Lucas Ward

Constructor Summary

Constructors

Constructor	Description
MethodInvokerUtils()

Method Summary

Modifier and Type	Method	Description
static MethodInvoker	getMethodInvokerByAnnotation(Class<? extends Annotation> annotationType, Object target)	Create MethodInvoker for the method with the provided annotation on the provided object.
static MethodInvoker	getMethodInvokerByAnnotation(Class<? extends Annotation> annotationType, Object target, Class<?>... expectedParamTypes)	Create a MethodInvoker from the delegate based on the annotationType.
static MethodInvoker	getMethodInvokerByName(Object object, String methodName, boolean paramsRequired, Class<?>... paramTypes)	Create a MethodInvoker using the provided method name to search.
static MethodInvoker	getMethodInvokerForInterface(Class<?> cls, String methodName, Object object, Class<?>... paramTypes)	Create a MethodInvoker using the provided interface, and method name from that interface.
static <C, T> MethodInvoker	getMethodInvokerForSingleArgument(Object target)	Create a MethodInvoker for the delegate from a single public method.
static String	getParamTypesString(Class<?>... paramTypes)	Create a String representation of the array of parameter types.

Methods inherited from class java.lang.Object

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

Constructor Details

MethodInvokerUtils

public MethodInvokerUtils()

Method Details

getMethodInvokerByName

public static MethodInvoker getMethodInvokerByName(Object object,
 String methodName,
 boolean paramsRequired,
 Class<?>... paramTypes)

Create a MethodInvoker using the provided method name to search.

Parameters:

object - to be invoked

methodName - of the method to be invoked

paramsRequired - boolean indicating whether the parameters are required, if false, a no args version of the method will be searched for.

paramTypes - - parameter types of the method to search for.

Returns:

MethodInvoker if the method is found

getParamTypesString

public static String getParamTypesString(Class<?>... paramTypes)

Create a String representation of the array of parameter types.

Parameters:

paramTypes - types of the parameters to be used

Returns:

String a String representation of those types

getMethodInvokerForInterface

@Nullable
public static MethodInvoker getMethodInvokerForInterface(Class<?> cls,
 String methodName,
 Object object,
 Class<?>... paramTypes)

Create a MethodInvoker using the provided interface, and method name from that interface.

Parameters:

cls - the interface to search for the method named

methodName - of the method to be invoked

object - to be invoked

paramTypes - - parameter types of the method to search for.

Returns:

MethodInvoker if the method is found, null if it is not.

getMethodInvokerByAnnotation

public static MethodInvoker getMethodInvokerByAnnotation(Class<? extends Annotation> annotationType,
 Object target,
 Class<?>... expectedParamTypes)

Create a MethodInvoker from the delegate based on the annotationType. Ensure that the annotated method has a valid set of parameters.

Parameters:

annotationType - the annotation to scan for

target - the target object

expectedParamTypes - the expected parameter types for the method

Returns:

a MethodInvoker

getMethodInvokerByAnnotation

@Nullable
public static MethodInvoker getMethodInvokerByAnnotation(Class<? extends Annotation> annotationType,
 Object target)

Create MethodInvoker for the method with the provided annotation on the provided object. Annotations that cannot be applied to methods (i.e. that aren't annotated with an element type of METHOD) will cause an exception to be thrown.

Parameters:

annotationType - to be searched for

target - to be invoked

Returns:

MethodInvoker for the provided annotation, null if none is found.

getMethodInvokerForSingleArgument

public static <C,
T> MethodInvoker getMethodInvokerForSingleArgument(Object target)

Create a MethodInvoker for the delegate from a single public method.

Type Parameters:

C - the class.

T - the type.

Parameters:

target - an object to search for an appropriate method.

Returns:

a MethodInvoker that calls a method on the delegate.