Top Description Fields Constructors Methods
org.apache.commons.collections4.functors

public Class InvokerTransformer<I, O>

extends Object
implements Transformer<I, O>
Class Inheritance
All Implemented Interfaces
org.apache.commons.collections4.Transformer
Imports
java.lang.reflect.InvocationTargetException, .Method, org.apache.commons.collections4.FunctorException, .Transformer
Transformer implementation that creates a new object instance by reflection.

Warning

from v4.1 onwards this class will not be serializable anymore in order to prevent potential remote code execution exploits. Please refer to COLLECTIONS-580 for more details.

Since
3.0

Field Summary

Modifier and TypeField and Description
private final Object[]
iArgs

The array of reflection arguments

private final String
iMethodName

The method name to call

private final Class<?>[]
iParamTypes

The array of reflection parameter types

Constructor Summary

AccessConstructor and Description
private
InvokerTransformer(final String
the method to call
methodName)

Constructor for no arg instance.

public
InvokerTransformer(final String
the method to call
methodName, final Class<?>[]
the constructor parameter types
paramTypes, final Object[]
the constructor arguments
args)

Constructor that performs no validation.

Method Summary

Modifier and TypeMethod and Description
public static <
the input type
I,
the output type
O> Transformer<I, O>

Returns:

an invoker transformer
invokerTransformer(final String
the method name to call
methodName)

Gets an instance of this transformer calling a specific method with no arguments.

public static <
the input type
I,
the output type
O> Transformer<I, O>

Returns:

an invoker transformer
invokerTransformer(final String
the method name to call
methodName, final Class<?>[]
the parameter types of the method
paramTypes, final Object[]
the arguments to pass to the method
args)

Gets an instance of this transformer calling a specific method with specific values.

public O

Returns:

the transformed result, null if null input
transform(final Object
the input object to transform
input)

Implements org.apache.commons.collections4.Transformer.transform.

Transforms the input to result by invoking a method on the input.
Inherited from java.lang.Object:
cloneequalsfinalizegetClasshashCodenotifynotifyAlltoStringwaitwaitwait

Field Detail

iArgsback to summary
private final Object[] iArgs

The array of reflection arguments

iMethodNameback to summary
private final String iMethodName

The method name to call

iParamTypesback to summary
private final Class<?>[] iParamTypes

The array of reflection parameter types

Constructor Detail

InvokerTransformerback to summary
private InvokerTransformer(final String methodName)

Constructor for no arg instance.

Parameters
methodName:String

the method to call

InvokerTransformerback to summary
public InvokerTransformer(final String methodName, final Class<?>[] paramTypes, final Object[] args)

Constructor that performs no validation. Use invokerTransformer if you want that.

Note

from 4.0, the input parameters will be cloned

Parameters
methodName:String

the method to call

paramTypes:Class<?>[]

the constructor parameter types

args:Object[]

the constructor arguments

Method Detail

invokerTransformerback to summary
public static <I, O> Transformer<I, O> invokerTransformer(final String methodName)

Gets an instance of this transformer calling a specific method with no arguments.

Parameters
<I>
the input type
<O>
the output type
methodName:String

the method name to call

Returns:Transformer<I, O>

an invoker transformer

Exceptions
NullPointerException:
if methodName is null
Since
3.1
invokerTransformerback to summary
public static <I, O> Transformer<I, O> invokerTransformer(final String methodName, final Class<?>[] paramTypes, final Object[] args)

Gets an instance of this transformer calling a specific method with specific values.

Parameters
<I>
the input type
<O>
the output type
methodName:String

the method name to call

paramTypes:Class<?>[]

the parameter types of the method

args:Object[]

the arguments to pass to the method

Returns:Transformer<I, O>

an invoker transformer

Exceptions
NullPointerException:
if methodName is null
IllegalArgumentException:
if paramTypes does not match args
transformback to summary
public O transform(final Object input)

Implements org.apache.commons.collections4.Transformer.transform.

Transforms the input to result by invoking a method on the input.

Parameters
input:Object

the input object to transform

Returns:O

the transformed result, null if null input

Annotations
@Override
@SuppressWarnings:unchecked