Package org.apache.commons.collections4.functors

Class InstantiateTransformer<T>

  • All Implemented Interfaces:
    Transformer<Class<? extends T>,​T>
    public class InstantiateTransformer<T>
extends Object
implements Transformer<Class<? extends T>,​T>
    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

      • InstantiateTransformer

        public InstantiateTransformer​(Class<?>[] paramTypes,
                              Object[] args)
        Constructor that performs no validation. Use instantiateTransformer if you want that.

        Note: from 4.0, the input parameters will be cloned

        Parameters:
        paramTypes - the constructor parameter types
        args - the constructor arguments

    • Method Detail

      • instantiateTransformer

        public static <T> Transformer<Class<? extends T>,​T> instantiateTransformer()
        Get a typed no-arg instance.
        Type Parameters:
        T - the type of the objects to be created
        Returns:
        Transformer<Class<? extends T>, T>

      • instantiateTransformer

        public static <T> Transformer<Class<? extends T>,​T> instantiateTransformer​(Class<?>[] paramTypes,
                                                                                 Object[] args)
        Transformer method that performs validation.
        Type Parameters:
        T - the type of the objects to be created
        Parameters:
        paramTypes - the constructor parameter types
        args - the constructor arguments
        Returns:
        an instantiate transformer
        Throws:
        IllegalArgumentException - if paramTypes does not match args

      • transform

        public T transform​(Class<? extends T> input)
        Transforms the input Class object to a result by instantiation.
        Specified by:
        transform in interface Transformer<Class<? extends T>,​T>
        Parameters:
        input - the input object to transform
        Returns:
        the transformed result