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 a single input argument and returns no result.
31 * Unlike most other functional interfaces, {@code Consumer} is expected to
32 * operate via side-effects.
33 *
34 * @param <T> The type of input objects to {@code accept}
35 *
36 * @since 1.8
37 */
38 @FunctionalInterface
39 public interface Consumer<T> {
40
41 /**
42 * Accept an input value.
43 *
44 * @param t the input object
45 */
46 void accept(T t);
47
48 /**
49 * Returns a {@code Consumer} which performs, in sequence, the operation
50 * represented by this object followed by the operation represented by
51 * the other {@code Consumer}.
52 *
53 * <p>Any exceptions thrown by either {@code accept} method are relayed
54 * to the caller; if performing this operation throws an exception, the
55 * other operation will not be performed.
56 *
57 * @param other a Consumer which will be chained after this Consumer
58 * @return a Consumer which performs in sequence the {@code accept} method
59 * of this Consumer and the {@code accept} method of the specified Consumer
60 * operation
61 * @throws NullPointerException if other is null
62 */
63 default Consumer<T> chain(Consumer<? super T> other) {
64 Objects.requireNonNull(other);
65 return (T t) -> { accept(t); other.accept(t); };
66 }
67 }
|
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 a single input argument and returns no
31 * result. Unlike most other functional interfaces, {@code Consumer} is expected
32 * to operate via side-effects.
33 *
34 * <p>This is a <a href="package-summary.html">functional interface</a>
35 * whose functional method is {@link #accept(Object)}.
36 *
37 * @param <T> the type of the input to the operation
38 *
39 * @since 1.8
40 */
41 @FunctionalInterface
42 public interface Consumer<T> {
43
44 /**
45 * Performs this operation on the given argument.
46 *
47 * @param t the input argument
48 */
49 void accept(T t);
50
51 /**
52 * Returns a composed {@code Consumer} that performs, in sequence, this
53 * operation followed by the {@code after} operation. If performing either
54 * operation throws an exception, it is relayed to the caller of the
55 * composed operation. If performing this operation throws an exception,
56 * the {@code after} operation will not be performed.
57 *
58 * @param after the operation to perform after this operation
59 * @return a composed {@code Consumer} that performs in sequence this
60 * operation followed by the {@code after} operation
61 * @throws NullPointerException if {@code after} is null
62 */
63 default Consumer<T> andThen(Consumer<? super T> after) {
64 Objects.requireNonNull(after);
65 return (T t) -> { accept(t); after.accept(t); };
66 }
67 }
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