org.apache.commons.collections.functors
Class InvokerTransformer

java.lang.Object
  org.apache.commons.collections.functors.InvokerTransformer

All Implemented Interfaces:

java.io.Serializable, Transformer

public class InvokerTransformer
extends java.lang.Object
implements Transformer, java.io.Serializable

Transformer implementation that creates a new object instance by reflection.

Since:

Commons Collections 3.0

Version:

$Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $

Author:

Stephen Colebourne

See Also:

Serialized Form

Constructor Summary

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

Method Summary

static Transformer	getInstance(java.lang.String methodName) Gets an instance of this transformer calling a specific method with no arguments.
static Transformer	getInstance(java.lang.String methodName, java.lang.Class[] paramTypes, java.lang.Object[] args) Gets an instance of this transformer calling a specific method with specific values.
java.lang.Object	transform(java.lang.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(java.lang.String methodName,
                          java.lang.Class[] paramTypes,
                          java.lang.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 Detail

getInstance

public static Transformer getInstance(java.lang.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(java.lang.String methodName,
                                      java.lang.Class[] paramTypes,
                                      java.lang.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 java.lang.Object transform(java.lang.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