001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache license, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the license for the specific language governing permissions and 015 * limitations under the license. 016 */ 017 package org.apache.logging.log4j.core.helpers; 018 019 import java.security.MessageDigest; 020 021 /** 022 * 023 */ 024 public final class NameUtil { 025 026 private static final int MASK = 0xff; 027 028 private NameUtil() { 029 } 030 031 public static String getSubName(final String name) { 032 if (name.length() == 0) { 033 return null; 034 } 035 final int i = name.lastIndexOf('.'); 036 return i > 0 ? name.substring(0, i) : ""; 037 } 038 039 public static String md5(final String string) { 040 try { 041 final MessageDigest digest = MessageDigest.getInstance("MD5"); 042 digest.update(string.getBytes()); 043 final byte[] bytes = digest.digest(); 044 final StringBuilder md5 = new StringBuilder(); 045 for (final byte b : bytes) { 046 final String hex = Integer.toHexString(MASK & b); 047 if (hex.length() == 1) { 048 md5.append('0'); 049 } 050 md5.append(hex); 051 } 052 return md5.toString(); 053 } catch (final Exception ex) { 054 return string; 055 } 056 } 057 }