java.lang.Object
- org.springframework.batch.item.adapter.AbstractMethodInvokingDelegator<T>

All Implemented Interfaces:
org.springframework.beans.factory.InitializingBean
Direct Known Subclasses:
ItemProcessorAdapter, ItemReaderAdapter, ItemWriterAdapter, MethodInvokingTaskletAdapter, PropertyExtractingDelegatingItemWriter
```
public abstract class AbstractMethodInvokingDelegator<T>
extends java.lang.Object
implements org.springframework.beans.factory.InitializingBean
```
Superclass for delegating classes which dynamically call a custom method of injected object. Provides convenient API for dynamic method invocation shielding subclasses from low-level details and exception handling. Exceptions thrown by a successfully invoked delegate method are re-thrown without wrapping. In case the delegate method throws a Throwable that doesn't subclass Exception it will be wrapped by AbstractMethodInvokingDelegator.InvocationTargetThrowableWrapper.
Author:
Robert Kasanicky, Mahmoud Ben Hassine

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`static class`	`AbstractMethodInvokingDelegator.InvocationTargetThrowableWrapper`	Used to wrap a `Throwable` (not an `Exception`) thrown by a reflectively-invoked delegate.

Constructor Summary
Constructors
Constructor Description
AbstractMethodInvokingDelegator()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`afterPropertiesSet()`
`protected java.lang.Object[]`	`getArguments()`	Return arguments.
`protected T`	`invokeDelegateMethod()`	Invoker the target method with arguments set by `setArguments(Object[])`.
`protected T`	`invokeDelegateMethodWithArgument(java.lang.Object object)`	Invokes the target method with given argument.
`protected T`	`invokeDelegateMethodWithArguments(java.lang.Object[] args)`	Invokes the target method with given arguments.
`void`	`setArguments(java.lang.Object[] arguments)`
`void`	`setTargetMethod(java.lang.String targetMethod)`
`void`	`setTargetObject(java.lang.Object targetObject)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - AbstractMethodInvokingDelegator
```
public AbstractMethodInvokingDelegator()
```
- Method Detail
  - invokeDelegateMethod
```
protected T invokeDelegateMethod()
                          throws java.lang.Exception
```
    Invoker the target method with arguments set by setArguments(Object[]).
    Returns:
    object returned by invoked method
    Throws:
    java.lang.Exception - exception thrown when executing the delegate method.
  - invokeDelegateMethodWithArgument
```
protected T invokeDelegateMethodWithArgument(java.lang.Object object)
                                      throws java.lang.Exception
```
    Invokes the target method with given argument.
    Parameters:
    object - argument for the target method
    Returns:
    object returned by target method
    Throws:
    java.lang.Exception - exception thrown when executing the delegate method.
  - invokeDelegateMethodWithArguments
```
protected T invokeDelegateMethodWithArguments(java.lang.Object[] args)
                                       throws java.lang.Exception
```
    Invokes the target method with given arguments.
    Parameters:
    args - arguments for the invoked method
    Returns:
    object returned by invoked method
    Throws:
    java.lang.Exception - exception thrown when executing the delegate method.
  - afterPropertiesSet
```
public void afterPropertiesSet()
                        throws java.lang.Exception
```
    Specified by:
    afterPropertiesSet in interface org.springframework.beans.factory.InitializingBean
    Throws:
    java.lang.Exception
  - setTargetObject
```
public void setTargetObject(java.lang.Object targetObject)
```
    Parameters:
    targetObject - the delegate - bean id can be used to set this value in Spring configuration
  - setTargetMethod
```
public void setTargetMethod(java.lang.String targetMethod)
```
    Parameters:
    targetMethod - name of the method to be invoked on setTargetObject(Object).
  - setArguments
```
public void setArguments(java.lang.Object[] arguments)
```
    Parameters:
    arguments - arguments values for the { setTargetMethod(String). These will be used only when the subclass tries to invoke the target method without providing explicit argument values. If arguments are set to not-null value afterPropertiesSet() will check the values are compatible with target method's signature. In case arguments are null (not set) method signature will not be checked and it is assumed correct values will be supplied at runtime.
  - getArguments
```
protected java.lang.Object[] getArguments()
```
    Return arguments.
    Returns:
    arguments

Class AbstractMethodInvokingDelegator<T>

Nested Class Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

AbstractMethodInvokingDelegator

Method Detail

invokeDelegateMethod

invokeDelegateMethodWithArgument

invokeDelegateMethodWithArguments

afterPropertiesSet

setTargetObject

setTargetMethod

setArguments

getArguments