10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25 package java.util.function;
26
27 import java.util.Objects;
28
29 /**
30 * An operation which accepts two input arguments and returns no result. This is
31 * the two-arity specialization of {@link Consumer}. Unlike most other
32 * functional interfaces, {@code BiConsumer} is expected to operate via
33 * side-effects.
34 *
35 * @param <T> the type of the first argument to the {@code accept} operation
36 * @param <U> the type of the second argument to the {@code accept} operation
37 *
38 * @see Consumer
39 * @since 1.8
40 */
41 @FunctionalInterface
42 public interface BiConsumer<T, U> {
43
44 /**
45 * Performs operations upon the provided objects which may modify those
46 * objects and/or external state.
47 *
48 * @param t an input object
49 * @param u an input object
50 */
51 void accept(T t, U u);
52
53 /**
54 * Returns a {@code BiConsumer} which performs, in sequence, the operation
55 * represented by this object followed by the operation represented by
56 * the other {@code BiConsumer}.
57 *
58 * <p>Any exceptions thrown by either {@code accept} method are relayed
59 * to the caller; if performing this operation throws an exception, the
60 * other operation will not be performed.
61 *
62 * @param other a BiConsumer which will be chained after this BiConsumer
63 * @return a BiConsumer which performs in sequence the {@code accept} method
64 * of this BiConsumer and the {@code accept} method of the specified
65 * BiConsumer operation
66 * @throws NullPointerException if other is null
67 */
68 default BiConsumer<T, U> chain(BiConsumer<? super T, ? super U> other) {
69 Objects.requireNonNull(other);
70
71 return (l, r) -> {
72 accept(l, r);
73 other.accept(l, r);
74 };
75 }
76 }
|
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25 package java.util.function;
26
27 import java.util.Objects;
28
29 /**
30 * Represents an operation that accepts two input arguments and returns no
31 * result. This is the two-arity specialization of {@link Consumer}.
32 * Unlike most other functional interfaces, {@code BiConsumer} is expected
33 * to operate via side-effects.
34 *
35 * <p>This is a <a href="package-summary.html">functional interface</a>
36 * whose functional method is {@link #accept(Object, Object)}.
37 *
38 * @param <T> the type of the first argument to the operation
39 * @param <U> the type of the second argument to the operation
40 *
41 * @see Consumer
42 * @since 1.8
43 */
44 @FunctionalInterface
45 public interface BiConsumer<T, U> {
46
47 /**
48 * Performs this operation on the given arguments.
49 *
50 * @param t the first input argument
51 * @param u the second input argument
52 */
53 void accept(T t, U u);
54
55 /**
56 * Returns a composed {@code BiConsumer} that performs, in sequence, this
57 * operation followed by the {@code after} operation. If performing either
58 * operation throws an exception, it is relayed to the caller of the
59 * composed operation. If performing this operation throws an exception,
60 * the {@code after} operation will not be performed.
61 *
62 * @param after the operation to perform after this operation
63 * @return a composed {@code BiConsumer} that performs in sequence this
64 * operation followed by the {@code after} operation
65 * @throws NullPointerException if {@code after} is null
66 */
67 default BiConsumer<T, U> andThen(BiConsumer<? super T, ? super U> after) {
68 Objects.requireNonNull(after);
69
70 return (l, r) -> {
71 accept(l, r);
72 after.accept(l, r);
73 };
74 }
75 }
|