1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache license, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the license for the specific language governing permissions and
15 * limitations under the license.
16 */
17 package org.apache.logging.log4j.core.layout.internal;
18
19 import java.util.List;
20
21 /**
22 * Class Description goes here.
23 */
24
25 public interface ListChecker {
26
27 static final NoopChecker NOOP_CHECKER = new NoopChecker();
28
29 boolean check(final String key);
30
31 /**
32 * Does nothing.
33 */
34 public class NoopChecker implements ListChecker {
35 @Override
36 public boolean check(final String key) {
37 return true;
38 }
39
40 @Override
41 public String toString() {
42 return "";
43 }
44 }
45 }