org.apache.commons.collections4.functors

Class 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 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