Package org.apache.commons.collections4.functors

Class InvokerTransformer<I,O>

java.lang.Object

org.apache.commons.collections4.functors.InvokerTransformer<I,O>

All Implemented Interfaces:

Transformer<I,O>

public class InvokerTransformer<I,O>
extends Object
implements Transformer<I,O>

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

Constructor Summary

Constructors

Constructor	Description
InvokerTransformer(String methodName, Class<?>[] paramTypes, Object[] args)	Constructor that performs no validation.

Method Summary

Modifier and Type	Method	Description
static <I,O> Transformer<I,O>	invokerTransformer(String methodName)	Gets an instance of this transformer calling a specific method with no arguments.
static <I,O> Transformer<I,O>	invokerTransformer(String methodName, Class<?>[] paramTypes, Object[] args)	Gets an instance of this transformer calling a specific method with specific values.
O	transform(Object input)	Transforms the input to result by invoking a method on the input.

Methods inherited from class java.lang.Object

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

Constructor Detail

InvokerTransformer

public InvokerTransformer(String methodName,
                          Class<?>[] paramTypes,
                          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 - the method to call

paramTypes - the constructor parameter types

args - the constructor arguments

Method Detail

invokerTransformer

public static <I,O> Transformer<I,O> invokerTransformer(String methodName)

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

Type Parameters:

I - the input type

O - the output type

Parameters:

methodName - the method name to call

Returns:

an invoker transformer

Throws:

NullPointerException - if methodName is null

Since:

3.1

invokerTransformer

public static <I,O> Transformer<I,O> invokerTransformer(String methodName,
                                                                    Class<?>[] paramTypes,
                                                                    Object[] args)

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

Type Parameters:

I - the input type

O - the output type

Parameters:

methodName - the method name to call

paramTypes - the parameter types of the method

args - the arguments to pass to the method

Returns:

an invoker transformer

Throws:

NullPointerException - if methodName is null

IllegalArgumentException - if paramTypes does not match args

transform

public O transform(Object input)

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

Specified by:

transform in interface Transformer<I,O>

Parameters:

input - the input object to transform

Returns:

the transformed result, null if null input