1 /*
2 * Copyright (c) 2012, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
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
143 * @return the non-{@code null} value described by this {@code Optional}
144 * @throws NoSuchElementException if no value is present
145 */
146 public T get() {
147 if (value == null) {
148 throw new NoSuchElementException("No value present");
149 }
150 return value;
151 }
152
153 /**
154 * If a value is present, returns {@code true}, otherwise {@code false}.
155 *
156 * @return {@code true} if a value is present, otherwise {@code false}
157 */
158 public boolean isPresent() {
159 return value != null;
160 }
161
162 /**
163 * If a value is present, performs the given action with the value,
164 * otherwise does nothing.
165 *
166 * @param action the action to be performed, if a value is present
167 * @throws NullPointerException if value is present and the given action is
168 * {@code null}
169 */
170 public void ifPresent(Consumer<? super T> action) {
171 if (value != null) {
172 action.accept(value);
173 }
174 }
175
176 /**
177 * If a value is present, performs the given action with the value,
178 * otherwise performs the given empty-based action.
179 *
180 * @param action the action to be performed, if a value is present
181 * @param emptyAction the empty-based action to be performed, if no value is
182 * present
|
1 /*
2 * Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
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
143 * @return the non-{@code null} value described by this {@code Optional}
144 * @throws NoSuchElementException if no value is present
145 */
146 public T get() {
147 if (value == null) {
148 throw new NoSuchElementException("No value present");
149 }
150 return value;
151 }
152
153 /**
154 * If a value is present, returns {@code true}, otherwise {@code false}.
155 *
156 * @return {@code true} if a value is present, otherwise {@code false}
157 */
158 public boolean isPresent() {
159 return value != null;
160 }
161
162 /**
163 * If a value is not present, returns {@code true}, otherwise
164 * {@code false}.
165 *
166 * @return {@code true} if a value is not present, otherwise {@code false}
167 */
168 public boolean isEmpty() {
169 return value == null;
170 }
171
172 /**
173 * If a value is present, performs the given action with the value,
174 * otherwise does nothing.
175 *
176 * @param action the action to be performed, if a value is present
177 * @throws NullPointerException if value is present and the given action is
178 * {@code null}
179 */
180 public void ifPresent(Consumer<? super T> action) {
181 if (value != null) {
182 action.accept(value);
183 }
184 }
185
186 /**
187 * If a value is present, performs the given action with the value,
188 * otherwise performs the given empty-based action.
189 *
190 * @param action the action to be performed, if a value is present
191 * @param emptyAction the empty-based action to be performed, if no value is
192 * present
|