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.helpers;
18
19 import java.security.MessageDigest;
20
21 /**
22 *
23 */
24 public final class NameUtil {
25
26 private static final int MASK = 0xff;
27
28 private NameUtil() {
29 }
30
31 public static String getSubName(final String name) {
32 if (name.isEmpty()) {
33 return null;
34 }
35 final int i = name.lastIndexOf('.');
36 return i > 0 ? name.substring(0, i) : "";
37 }
38
39 public static String md5(final String string) {
40 try {
41 final MessageDigest digest = MessageDigest.getInstance("MD5");
42 digest.update(string.getBytes());
43 final byte[] bytes = digest.digest();
44 final StringBuilder md5 = new StringBuilder();
45 for (final byte b : bytes) {
46 final String hex = Integer.toHexString(MASK & b);
47 if (hex.length() == 1) {
48 md5.append('0');
49 }
50 md5.append(hex);
51 }
52 return md5.toString();
53 } catch (final Exception ex) {
54 return string;
55 }
56 }
57 }