Package org.apache.commons.collections.functors

Class InvokerTransformer

  • All Implemented Interfaces:
    Serializable, Transformer
    public class InvokerTransformer
extends Object
implements Transformer, Serializable
    Transformer implementation that creates a new object instance by reflection.

    WARNING: from v3.2.2 onwards this class will throw an UnsupportedOperationException when trying to serialize or de-serialize an instance to prevent potential remote code execution exploits.

    In order to re-enable serialization support for InvokerTransformer the following system property can be used (via -Dproperty=true): 

     org.apache.commons.collections.enableUnsafeSerialization
    Since:
    Commons Collections 3.0
    Version:
    $Revision: 1713845 $ $Date: 2015-11-11 15:02:16 +0100 (Wed, 11 Nov 2015) $
    Author:
    Stephen Colebourne
    See Also:
    Serialized Form

    • Constructor Detail

      • 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 Detail

      • 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