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- /*
- * Copyright (C) 2012-present the original author or authors.
- *
- * Licensed 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.pf4j.util;
-
- /**
- * @author Decebal Suiu
- */
- public class StringUtils {
-
- private StringUtils() {}
-
- public static boolean isNullOrEmpty(String str) {
- return (str == null) || str.isEmpty();
- }
-
- public static boolean isNotNullOrEmpty(String str) {
- return !isNullOrEmpty(str);
- }
-
- /**
- * Format the string. Replace "{}" with %s and format the string using {@link String#format(String, Object...)}.
- */
- public static String format(String str, Object... args) {
- str = str.replaceAll("\\{}", "%s");
-
- return String.format(str, args);
- }
-
- /**
- * <p>Adds a substring only if the source string does not already start with the substring,
- * otherwise returns the source string.</p>
- * <p/>
- * <p>A {@code null} source string will return {@code null}.
- * An empty ("") source string will return the empty string.
- * A {@code null} search string will return the source string.</p>
- * <p/>
- * <pre>
- * StringUtils.addStart(null, *) = *
- * StringUtils.addStart("", *) = *
- * StringUtils.addStart(*, null) = *
- * StringUtils.addStart("domain.com", "www.") = "www.domain.com"
- * StringUtils.addStart("abc123", "abc") = "abc123"
- * </pre>
- *
- * @param str the source String to search, may be null
- * @param add the String to search for and add, may be null
- * @return the substring with the string added if required
- */
- public static String addStart(String str, String add) {
- if (isNullOrEmpty(add)) {
- return str;
- }
-
- if (isNullOrEmpty(str)) {
- return add;
- }
-
- if (!str.startsWith(add)) {
- return add + str;
- }
-
- return str;
- }
-
- }
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