1 /**

     2  * Performs operations upon an input object which may modify that object and/or

     3  * external state (other objects).

     4  *

     5  * <p>All block implementations are expected to:

     6  * <ul>

     7  * <li>When used for aggregate operations upon many elements blocks

     8  * should not assume that the {@code apply} operation will be called upon

     9  * elements in any specific order.</li>

    10  * </ul>

    11  *

    12  * @param <T> The type of input objects to {@code apply}.

    13  */

    14 public interface TBlock<T> {

    15 

    16     /**

    17      * Performs operations upon the provided object which may modify that object

    18      * and/or external state.

    19      *

    20      * @param t an input object

    21      */

    22     void apply(T t);

    23 

    24     /**

    25      * Returns a Block which performs in sequence the {@code apply} methods of

    26      * multiple Blocks. This Block's {@code apply} method is performed followed

    27      * by the {@code apply} method of the specified Block operation.

    28      *

    29      * @param other an additional Block which will be chained after this Block

    30      * @return a Block which performs in sequence the {@code apply} method of

    31      * this Block and the {@code apply} method of the specified Block operation

    32      */

    33     public default TBlock<T> chain(TBlock<? super T> other) {

    34         return (T t) -> { apply(t); other.apply(t); };

    35     }

    36 }