1 /*
2 * Copyright 2016 The Netty Project
3 *
4 * The Netty Project licenses this file to you under the Apache License,
5 * version 2.0 (the "License"); you may not use this file except in compliance
6 * with the License. You may obtain a copy of the License at:
7 *
8 * https://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations
14 * under the License.
15 */
16 package io.netty.util;
17
18 /**
19 * Represents a supplier of {@code boolean}-valued results.
20 */
21 public interface BooleanSupplier {
22 /**
23 * Gets a boolean value.
24 * @return a boolean value.
25 * @throws Exception If an exception occurs.
26 */
27 boolean get() throws Exception;
28
29 /**
30 * A supplier which always returns {@code false} and never throws.
31 */
32 BooleanSupplier FALSE_SUPPLIER = new BooleanSupplier() {
33 @Override
34 public boolean get() {
35 return false;
36 }
37 };
38
39 /**
40 * A supplier which always returns {@code true} and never throws.
41 */
42 BooleanSupplier TRUE_SUPPLIER = new BooleanSupplier() {
43 @Override
44 public boolean get() {
45 return true;
46 }
47 };
48 }