org.apache.commons.collections.functors

Class InvokerTransformer

Implemented Interfaces:
Serializable, Transformer

public class InvokerTransformer
extends Object
implements Transformer, Serializable

Transformer implementation that creates a new object instance by reflection.

Version:
$Revision: 1.7 $ $Date: 2004/05/26 21:44:05 $

Author:
Stephen Colebourne

Since:
Commons Collections 3.0

Constructor Summary

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

Method Summary

static Transformer
getInstance(String methodName)
Gets an instance of this transformer calling a specific method with no arguments.
static Transformer
getInstance(String methodName, Class[] paramTypes, Object[] args)
Gets an instance of this transformer calling a specific method with specific values.
Object
transform(Object input)
Transforms the input to result by invoking a method on the input.

Constructor Details

InvokerTransformer

public InvokerTransformer(String methodName,
                          Class[] paramTypes,
                          Object[] args)
Constructor that performs no validation. Use getInstance if you want that.

Parameters:
methodName - the method to call
paramTypes - the constructor parameter types, not cloned
args - the constructor arguments, not cloned

Method Details

getInstance

public static Transformer getInstance(String methodName)
Gets an instance of this transformer calling a specific method with no arguments.

Parameters:
methodName - the method name to call

Returns:
an invoker transformer

Since:
Commons Collections 3.1


getInstance

public static Transformer getInstance(String methodName,
                                      Class[] paramTypes,
                                      Object[] args)
Gets an instance of this transformer calling a specific method with specific values.

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 Object transform(Object input)
Transforms the input to result by invoking a method on the input.
Specified by:
transform in interface Transformer

Parameters:
input - the input object to transform

Returns:
the transformed result, null if null input


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