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

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

All Implemented Interfaces:

Serializable, Transformer<I,O>

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

Transformer implementation that creates a new object instance by reflection.

Since:

3.0

Version:

$Id: InvokerTransformer.java 1477839 2013-04-30 21:32:47Z tn $

See Also:

Serialized Form

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

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

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

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