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| 1 | +//****************************************************************************************************** | |
| 2 | +// StringExtensions.java - Gbtc | |
| 3 | +// | |
| 4 | +// Copyright � 2010, Grid Protection Alliance. All Rights Reserved. | |
| 5 | +// | |
| 6 | +// Licensed to the Grid Protection Alliance (GPA) under one or more contributor license agreements. See | |
| 7 | +// the NOTICE file distributed with this work for additional information regarding copyright ownership. | |
| 8 | +// The GPA licenses this file to you under the Eclipse Public License -v 1.0 (the "License"); you may | |
| 9 | +// not use this file except in compliance with the License. You may obtain a copy of the License at: | |
| 10 | +// | |
| 11 | +// http://www.opensource.org/licenses/eclipse-1.0.php | |
| 12 | +// | |
| 13 | +// Unless agreed to in writing, the subject software distributed under the License is distributed on an | |
| 14 | +// "AS-IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. Refer to the | |
| 15 | +// License for the specific language governing permissions and limitations. | |
| 16 | +// | |
| 17 | +// Code Modification History: | |
| 18 | +// ---------------------------------------------------------------------------------------------------- | |
| 19 | +// 04/18/2012 - Stephen C. Wills | |
| 20 | +// Generated original version of source code. | |
| 21 | +// | |
| 22 | +//****************************************************************************************************** | |
| 23 | + | |
| 24 | +package org.gpa.tsf.util; | |
| 25 | + | |
| 26 | +/** | |
| 27 | + * Utility class that provides additional functionality for strings. | |
| 28 | + */ | |
| 29 | +public class StringExtensions | |
| 30 | +{ | |
| 31 | + /** | |
| 32 | + * Determines whether the given string is null or the empty string. | |
| 33 | + * | |
| 34 | + * @param str the string to be checked | |
| 35 | + * @return true if the string is null or empty; false otherwise | |
| 36 | + */ | |
| 37 | + public static boolean isNullOrEmpty(String str) | |
| 38 | + { | |
| 39 | + return (str == null) || str.isEmpty(); | |
| 40 | + } | |
| 41 | + | |
| 42 | + /** | |
| 43 | + * Determines whether the given string is null or contains | |
| 44 | + * nothing but whitespace characters. | |
| 45 | + * | |
| 46 | + * @param str the string to be checked | |
| 47 | + * @return true if the string is null or whitespace; false otherwise | |
| 48 | + */ | |
| 49 | + public static boolean isNullOrWhitespace(String str) | |
| 50 | + { | |
| 51 | + return (str == null) || str.trim().isEmpty(); | |
| 52 | + } | |
| 53 | + | |
| 54 | + /** | |
| 55 | + * Converts null strings to the empty string. If a string is provided | |
| 56 | + * which is not null, no operation is performed and the string is | |
| 57 | + * returned as-is. | |
| 58 | + * | |
| 59 | + * @param str the string to be checked | |
| 60 | + * @return the empty string if the parameter is null; otherwise the | |
| 61 | + * parameter itself is returned | |
| 62 | + */ | |
| 63 | + public static String toNonNull(String str) | |
| 64 | + { | |
| 65 | + return toNonNull(str, ""); | |
| 66 | + } | |
| 67 | + | |
| 68 | + /** | |
| 69 | + * Converts null strings to the given default string value. If a | |
| 70 | + * string is provided which is not null, no operation is performed | |
| 71 | + * and the string is returned as-is. | |
| 72 | + * | |
| 73 | + * @param str the string to be checked | |
| 74 | + * @param defaultValue the default value to return if the provided | |
| 75 | + * string happens to be null | |
| 76 | + * @return the default value if the first parameter is null; otherwise | |
| 77 | + * the first parameter itself is returned | |
| 78 | + */ | |
| 79 | + public static String toNonNull(String str, String defaultValue) | |
| 80 | + { | |
| 81 | + if (str != null) | |
| 82 | + return str; | |
| 83 | + else if (defaultValue != null) | |
| 84 | + return defaultValue; | |
| 85 | + else | |
| 86 | + return ""; | |
| 87 | + } | |
| 88 | +} | |