| /* |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| */ |
| package org.apache.qpid.server.util; |
| |
| import java.nio.charset.StandardCharsets; |
| import java.security.MessageDigest; |
| import java.security.NoSuchAlgorithmException; |
| import java.util.Random; |
| |
| import javax.xml.bind.DatatypeConverter; |
| |
| |
| public class StringUtil |
| { |
| private static final String NUMBERS = "0123456789"; |
| private static final String LETTERS = "abcdefghijklmnopqrstuvwxwy"; |
| private static final String OTHERS = "_-"; |
| private static final char[] CHARACTERS = (NUMBERS + LETTERS + LETTERS.toUpperCase() + OTHERS).toCharArray(); |
| |
| private Random _random = new Random(); |
| |
| public String randomAlphaNumericString(int maxLength) |
| { |
| char[] result = new char[maxLength]; |
| for (int i = 0; i < maxLength; i++) |
| { |
| result[i] = (char) CHARACTERS[_random.nextInt(CHARACTERS.length)]; |
| } |
| return new String(result); |
| } |
| |
| /** |
| * Builds a legal java name, based on manager name if possible, |
| * this is unique for the given input. |
| * |
| * @param managerName |
| * @return unique java name |
| */ |
| public String createUniqueJavaName(String managerName) |
| { |
| StringBuilder builder = new StringBuilder(); |
| boolean initialChar = true; |
| for (int i = 0; i < managerName.length(); i++) |
| { |
| char c = managerName.charAt(i); |
| if ((initialChar && Character.isJavaIdentifierStart(c)) |
| || (!initialChar && Character.isJavaIdentifierPart(c))) |
| { |
| builder.append(c); |
| initialChar = false; |
| } |
| } |
| if (builder.length() > 0) |
| { |
| builder.append("_"); |
| } |
| try |
| { |
| byte[] digest = MessageDigest.getInstance("MD5").digest(managerName.getBytes(StandardCharsets.UTF_8)); |
| builder.append(DatatypeConverter.printHexBinary(digest).toLowerCase()); |
| } |
| catch (NoSuchAlgorithmException e) |
| { |
| throw new ServerScopedRuntimeException(e); |
| } |
| return builder.toString(); |
| } |
| |
| } |