| /** |
| * 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.cxf.dosgi.discovery.zookeeper.server.util; |
| |
| import java.util.ArrayList; |
| import java.util.Dictionary; |
| import java.util.Enumeration; |
| import java.util.List; |
| import java.util.Properties; |
| |
| /** |
| * General purpose utility methods. |
| */ |
| public final class Utils { |
| |
| private Utils() { |
| // prevent instantiation |
| } |
| |
| /** |
| * Remove entries whose values are empty from the given dictionary. |
| * |
| * @param dict a dictionary |
| */ |
| public static void removeEmptyValues(Dictionary<String, ?> dict) { |
| List<String> keysToRemove = new ArrayList<String>(); |
| Enumeration<String> keys = dict.keys(); |
| while (keys.hasMoreElements()) { |
| String key = keys.nextElement(); |
| Object value = dict.get(key); |
| if (value instanceof String && "".equals(value)) { |
| keysToRemove.add(key); |
| } |
| } |
| for (String key : keysToRemove) { |
| dict.remove(key); |
| } |
| } |
| |
| /** |
| * Puts the given key-value pair in the given dictionary if the key does not |
| * already exist in it or if its existing value is null. |
| * |
| * @param dict a dictionary |
| * @param key the key |
| * @param value the default value to set |
| */ |
| public static void setDefault(Dictionary<String, String> dict, String key, String value) { |
| if (dict.get(key) == null) { |
| dict.put(key, value); |
| } |
| } |
| |
| /** |
| * Converts a Dictionary into a Properties instance. |
| * |
| * @param dict a dictionary |
| * @param <K> the key type |
| * @param <V> the value type |
| * @return the properties |
| */ |
| public static <K, V> Properties toProperties(Dictionary<K, V> dict) { |
| Properties props = new Properties(); |
| for (Enumeration<K> e = dict.keys(); e.hasMoreElements();) { |
| K key = e.nextElement(); |
| props.put(key, dict.get(key)); |
| } |
| return props; |
| } |
| } |