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+/*
+ * ============LICENSE_START===================================================
+ * Copyright (c) 2018 Amdocs
+ * ============================================================================
+ * 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.
+ * ============LICENSE_END=====================================================
+ */
+package org.onap.aai.validation.util;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Pattern;
+import java.util.regex.PatternSyntaxException;
+import org.onap.aai.cl.api.Logger;
+import org.onap.aai.validation.exception.ValidationServiceError;
+import org.onap.aai.validation.exception.ValidationServiceException;
+import org.onap.aai.validation.logging.ApplicationMsgs;
+import org.onap.aai.validation.logging.LogHelper;
+
+/**
+ * Utility class for String manipulation.
+ */
+public class StringUtils {
+
+ private static final Logger applicationLogger = LogHelper.INSTANCE;
+
+ /**
+ * All methods are static.
+ */
+ private StringUtils() {
+ // Do not instantiate
+ }
+
+ /**
+ * Utility method to strip a prefix or set of prefixes (identified by a delimiter sequence) from the string. This is
+ * achieved by finding the index of the last prefix delimiter in the string and removing all characters before and
+ * including this index.
+ *
+ * @param string the String to strip prefixes from
+ * @param prefixDelimiter the String that acts as the delimiter for the prefix(es)
+ * @return the String minus the prefixes
+ */
+ public static String stripPrefix(String string, String prefixDelimiter) {
+ return string.contains(prefixDelimiter)
+ ? string.substring(string.lastIndexOf(prefixDelimiter) + prefixDelimiter.length()) : string;
+ }
+
+ /**
+ * Strips a prefix identified by a delimiter. This is achieved by splitting the string in two around matches of the
+ * first occurrence of the given regular expression.
+ *
+ * @param string a String from which to strip a prefix
+ * @param regex the delimiting regular expression
+ * @return
+ * @throws ValidationServiceException If there is a problem with the provided regular expression.
+ */
+ public static String stripPrefixRegex(String string, String regex) throws ValidationServiceException {
+ String[] strings = validParameters(string, regex) ? string.split(regex, 2) : new String[0];
+ return strings.length == 2 ? strings[1] : string;
+ }
+
+ /**
+ * Process a list of strings and strip the given suffix from each string in the list.
+ *
+ * @param stringList a list of strings
+ * @param suffix a suffix to be removed from the strings
+ * @return stripped list of strings.
+ */
+ public static List<String> stripSuffix(List<String> stringList, String suffix) {
+ List<String> result = new ArrayList<>();
+ for (String str : stringList) {
+ String stripped = str.endsWith(suffix) ? str.substring(0, str.indexOf(suffix)) : str;
+ result.add(stripped);
+ }
+ return result;
+ }
+
+ private static boolean validParameters(String string, String regex) throws ValidationServiceException {
+ if (string != null && !string.isEmpty() && regex != null && !regex.isEmpty()) {
+ try {
+ Pattern.compile(regex);
+ return true;
+ } catch (PatternSyntaxException e) {
+ applicationLogger.error(ApplicationMsgs.STRING_UTILS_INVALID_REGEX, regex);
+ throw new ValidationServiceException(ValidationServiceError.STRING_UTILS_INVALID_REGEX, e, regex);
+ }
+ }
+ return false;
+ }
+}