aoqi@0: /**
aoqi@0:  * Performs operations upon an input object which may modify that object and/or
aoqi@0:  * external state (other objects).
aoqi@0:  *
aoqi@0:  * <p>All block implementations are expected to:
aoqi@0:  * <ul>
aoqi@0:  * <li>When used for aggregate operations upon many elements blocks
aoqi@0:  * should not assume that the {@code apply} operation will be called upon
aoqi@0:  * elements in any specific order.</li>
aoqi@0:  * </ul>
aoqi@0:  *
aoqi@0:  * @param <T> The type of input objects to {@code apply}.
aoqi@0:  */
aoqi@0: public interface TBlock<T> {
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Performs operations upon the provided object which may modify that object
aoqi@0:      * and/or external state.
aoqi@0:      *
aoqi@0:      * @param t an input object
aoqi@0:      */
aoqi@0:     void apply(T t);
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Returns a Block which performs in sequence the {@code apply} methods of
aoqi@0:      * multiple Blocks. This Block's {@code apply} method is performed followed
aoqi@0:      * by the {@code apply} method of the specified Block operation.
aoqi@0:      *
aoqi@0:      * @param other an additional Block which will be chained after this Block
aoqi@0:      * @return a Block which performs in sequence the {@code apply} method of
aoqi@0:      * this Block and the {@code apply} method of the specified Block operation
aoqi@0:      */
aoqi@0:     public default TBlock<T> chain(TBlock<? super T> other) {
aoqi@0:         return (T t) -> { apply(t); other.apply(t); };
aoqi@0:     }
aoqi@0: }