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    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  }