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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;
}
}
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