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.util;
18
19 import java.security.MessageDigest;
20
21 import org.apache.logging.log4j.util.Strings;
22
23 /**
24 *
25 */
26 public final class NameUtil {
27
28 private static final int MASK = 0xff;
29
30 private NameUtil() {
31 }
32
33 public static String getSubName(final String name) {
34 if (name.isEmpty()) {
35 return null;
36 }
37 final int i = name.lastIndexOf('.');
38 return i > 0 ? name.substring(0, i) : Strings.EMPTY;
39 }
40
41 public static String md5(final String string) {
42 try {
43 final MessageDigest digest = MessageDigest.getInstance("MD5");
44 digest.update(string.getBytes());
45 final byte[] bytes = digest.digest();
46 final StringBuilder md5 = new StringBuilder();
47 for (final byte b : bytes) {
48 final String hex = Integer.toHexString(MASK & b);
49 if (hex.length() == 1) {
50 md5.append('0');
51 }
52 md5.append(hex);
53 }
54 return md5.toString();
55 } catch (final Exception ex) {
56 return string;
57 }
58 }
59 }