nd4j/nd4j-common/src/main/java/org/nd4j/common/io/StringUtils.java
/*
* ******************************************************************************
* *
* *
* * This program and the accompanying materials are made available under the
* * terms of the Apache License, Version 2.0 which is available at
* * https://www.apache.org/licenses/LICENSE-2.0.
* *
* * See the NOTICE file distributed with this work for additional
* * information regarding copyright ownership.
* * 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.
* *
* * SPDX-License-Identifier: Apache-2.0
* *****************************************************************************
*/
package org.nd4j.common.io;
import java.util.*;
public abstract class StringUtils {
private static final String FOLDER_SEPARATOR = "/";
private static final String WINDOWS_FOLDER_SEPARATOR = "\\";
private static final String TOP_PATH = "..";
private static final String CURRENT_PATH = ".";
private static final char EXTENSION_SEPARATOR = '.';
public StringUtils() {}
public static boolean isEmpty(Object str) {
return str == null || "".equals(str);
}
public static boolean hasLength(CharSequence str) {
return str != null && str.length() > 0;
}
public static boolean hasLength(String str) {
return hasLength((CharSequence) str);
}
public static boolean hasText(CharSequence str) {
if (!hasLength(str)) {
return false;
} else {
int strLen = str.length();
for (int i = 0; i < strLen; ++i) {
if (!Character.isWhitespace(str.charAt(i))) {
return true;
}
}
return false;
}
}
public static boolean hasText(String str) {
return hasText((CharSequence) str);
}
public static boolean containsWhitespace(CharSequence str) {
if (!hasLength(str)) {
return false;
} else {
int strLen = str.length();
for (int i = 0; i < strLen; ++i) {
if (Character.isWhitespace(str.charAt(i))) {
return true;
}
}
return false;
}
}
public static boolean containsWhitespace(String str) {
return containsWhitespace((CharSequence) str);
}
public static String trimWhitespace(String str) {
if (!hasLength(str)) {
return str;
} else {
StringBuilder sb = new StringBuilder(str);
while (sb.length() > 0 && Character.isWhitespace(sb.charAt(0))) {
sb.deleteCharAt(0);
}
while (sb.length() > 0 && Character.isWhitespace(sb.charAt(sb.length() - 1))) {
sb.deleteCharAt(sb.length() - 1);
}
return sb.toString();
}
}
public static String trimAllWhitespace(String str) {
if (!hasLength(str)) {
return str;
} else {
StringBuilder sb = new StringBuilder(str);
int index = 0;
while (sb.length() > index) {
if (Character.isWhitespace(sb.charAt(index))) {
sb.deleteCharAt(index);
} else {
++index;
}
}
return sb.toString();
}
}
public static String trimLeadingWhitespace(String str) {
if (!hasLength(str)) {
return str;
} else {
StringBuilder sb = new StringBuilder(str);
while (sb.length() > 0 && Character.isWhitespace(sb.charAt(0))) {
sb.deleteCharAt(0);
}
return sb.toString();
}
}
public static String trimTrailingWhitespace(String str) {
if (!hasLength(str)) {
return str;
} else {
StringBuilder sb = new StringBuilder(str);
while (sb.length() > 0 && Character.isWhitespace(sb.charAt(sb.length() - 1))) {
sb.deleteCharAt(sb.length() - 1);
}
return sb.toString();
}
}
public static String trimLeadingCharacter(String str, char leadingCharacter) {
if (!hasLength(str)) {
return str;
} else {
StringBuilder sb = new StringBuilder(str);
while (sb.length() > 0 && sb.charAt(0) == leadingCharacter) {
sb.deleteCharAt(0);
}
return sb.toString();
}
}
public static String trimTrailingCharacter(String str, char trailingCharacter) {
if (!hasLength(str)) {
return str;
} else {
StringBuilder sb = new StringBuilder(str);
while (sb.length() > 0 && sb.charAt(sb.length() - 1) == trailingCharacter) {
sb.deleteCharAt(sb.length() - 1);
}
return sb.toString();
}
}
public static boolean startsWithIgnoreCase(String str, String prefix) {
if (str != null && prefix != null) {
if (str.startsWith(prefix)) {
return true;
} else if (str.length() < prefix.length()) {
return false;
} else {
String lcStr = str.substring(0, prefix.length()).toLowerCase();
String lcPrefix = prefix.toLowerCase();
return lcStr.equals(lcPrefix);
}
} else {
return false;
}
}
public static boolean endsWithIgnoreCase(String str, String suffix) {
if (str != null && suffix != null) {
if (str.endsWith(suffix)) {
return true;
} else if (str.length() < suffix.length()) {
return false;
} else {
String lcStr = str.substring(str.length() - suffix.length()).toLowerCase();
String lcSuffix = suffix.toLowerCase();
return lcStr.equals(lcSuffix);
}
} else {
return false;
}
}
public static boolean substringMatch(CharSequence str, int index, CharSequence substring) {
for (int j = 0; j < substring.length(); ++j) {
int i = index + j;
if (i >= str.length() || str.charAt(i) != substring.charAt(j)) {
return false;
}
}
return true;
}
public static int countOccurrencesOf(String str, String sub) {
if (str != null && sub != null && str.length() != 0 && sub.length() != 0) {
int count = 0;
int idx;
for (int pos = 0; (idx = str.indexOf(sub, pos)) != -1; pos = idx + sub.length()) {
++count;
}
return count;
} else {
return 0;
}
}
public static String replace(String inString, String oldPattern, String newPattern) {
if (hasLength(inString) && hasLength(oldPattern) && newPattern != null) {
StringBuilder sb = new StringBuilder();
int pos = 0;
int index = inString.indexOf(oldPattern);
for (int patLen = oldPattern.length(); index >= 0; index = inString.indexOf(oldPattern, pos)) {
sb.append(inString.substring(pos, index));
sb.append(newPattern);
pos = index + patLen;
}
sb.append(inString.substring(pos));
return sb.toString();
} else {
return inString;
}
}
public static String delete(String inString, String pattern) {
return replace(inString, pattern, "");
}
public static String deleteAny(String inString, String charsToDelete) {
if (hasLength(inString) && hasLength(charsToDelete)) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < inString.length(); ++i) {
char c = inString.charAt(i);
if (charsToDelete.indexOf(c) == -1) {
sb.append(c);
}
}
return sb.toString();
} else {
return inString;
}
}
public static String quote(String str) {
return str != null ? "\'" + str + "\'" : null;
}
public static Object quoteIfString(Object obj) {
return obj instanceof String ? quote((String) obj) : obj;
}
public static String unqualify(String qualifiedName) {
return unqualify(qualifiedName, '.');
}
public static String unqualify(String qualifiedName, char separator) {
return qualifiedName.substring(qualifiedName.lastIndexOf(separator) + 1);
}
public static String capitalize(String str) {
return changeFirstCharacterCase(str, true);
}
public static String uncapitalize(String str) {
return changeFirstCharacterCase(str, false);
}
private static String changeFirstCharacterCase(String str, boolean capitalize) {
if (str != null && str.length() != 0) {
StringBuilder sb = new StringBuilder(str.length());
if (capitalize) {
sb.append(Character.toUpperCase(str.charAt(0)));
} else {
sb.append(Character.toLowerCase(str.charAt(0)));
}
sb.append(str.substring(1));
return sb.toString();
} else {
return str;
}
}
public static String getFilename(String path) {
if (path == null) {
return null;
} else {
int separatorIndex = path.lastIndexOf("/");
return separatorIndex != -1 ? path.substring(separatorIndex + 1) : path;
}
}
public static String getFilenameExtension(String path) {
if (path == null) {
return null;
} else {
int extIndex = path.lastIndexOf(46);
if (extIndex == -1) {
return null;
} else {
int folderIndex = path.lastIndexOf("/");
return folderIndex > extIndex ? null : path.substring(extIndex + 1);
}
}
}
public static String stripFilenameExtension(String path) {
if (path == null) {
return null;
} else {
int extIndex = path.lastIndexOf(46);
if (extIndex == -1) {
return path;
} else {
int folderIndex = path.lastIndexOf("/");
return folderIndex > extIndex ? path : path.substring(0, extIndex);
}
}
}
public static String applyRelativePath(String path, String relativePath) {
int separatorIndex = path.lastIndexOf("/");
if (separatorIndex != -1) {
String newPath = path.substring(0, separatorIndex);
if (!relativePath.startsWith("/")) {
newPath = newPath + "/";
}
return newPath + relativePath;
} else {
return relativePath;
}
}
public static String cleanPath(String path) {
if (path == null) {
return null;
} else {
String pathToUse = replace(path, "\\", "/");
int prefixIndex = pathToUse.indexOf(":");
String prefix = "";
if (prefixIndex != -1) {
prefix = pathToUse.substring(0, prefixIndex + 1);
pathToUse = pathToUse.substring(prefixIndex + 1);
}
if (pathToUse.startsWith("/")) {
prefix = prefix + "/";
pathToUse = pathToUse.substring(1);
}
String[] pathArray = delimitedListToStringArray(pathToUse, "/");
LinkedList pathElements = new LinkedList();
int tops = 0;
int i;
for (i = pathArray.length - 1; i >= 0; --i) {
String element = pathArray[i];
if (!".".equals(element)) {
if ("..".equals(element)) {
++tops;
} else if (tops > 0) {
--tops;
} else {
pathElements.add(0, element);
}
}
}
for (i = 0; i < tops; ++i) {
pathElements.add(0, "..");
}
return prefix + collectionToDelimitedString(pathElements, "/");
}
}
public static boolean pathEquals(String path1, String path2) {
return cleanPath(path1).equals(cleanPath(path2));
}
public static Locale parseLocaleString(String localeString) {
String[] parts = tokenizeToStringArray(localeString, "_ ", false, false);
String language = parts.length > 0 ? parts[0] : "";
String country = parts.length > 1 ? parts[1] : "";
validateLocalePart(language);
validateLocalePart(country);
String variant = "";
if (parts.length >= 2) {
int endIndexOfCountryCode = localeString.lastIndexOf(country) + country.length();
variant = trimLeadingWhitespace(localeString.substring(endIndexOfCountryCode));
if (variant.startsWith("_")) {
variant = trimLeadingCharacter(variant, '_');
}
}
return language.length() > 0 ? new Locale(language, country, variant) : null;
}
private static void validateLocalePart(String localePart) {
for (int i = 0; i < localePart.length(); ++i) {
char ch = localePart.charAt(i);
if (ch != 95 && ch != 32 && !Character.isLetterOrDigit(ch)) {
throw new IllegalArgumentException("Locale part \"" + localePart + "\" contains invalid characters");
}
}
}
public static String toLanguageTag(Locale locale) {
return locale.getLanguage() + (hasText(locale.getCountry()) ? "-" + locale.getCountry() : "");
}
public static String[] addStringToArray(String[] array, String str) {
if (ObjectUtils.isEmpty(array)) {
return new String[] {str};
} else {
String[] newArr = new String[array.length + 1];
System.arraycopy(array, 0, newArr, 0, array.length);
newArr[array.length] = str;
return newArr;
}
}
public static String[] concatenateStringArrays(String[] array1, String[] array2) {
if (ObjectUtils.isEmpty(array1)) {
return array2;
} else if (ObjectUtils.isEmpty(array2)) {
return array1;
} else {
String[] newArr = new String[array1.length + array2.length];
System.arraycopy(array1, 0, newArr, 0, array1.length);
System.arraycopy(array2, 0, newArr, array1.length, array2.length);
return newArr;
}
}
public static String[] mergeStringArrays(String[] array1, String[] array2) {
if (ObjectUtils.isEmpty(array1)) {
return array2;
} else if (ObjectUtils.isEmpty(array2)) {
return array1;
} else {
ArrayList result = new ArrayList();
result.addAll(Arrays.asList(array1));
String[] arr$ = array2;
int len$ = array2.length;
for (int i$ = 0; i$ < len$; ++i$) {
String str = arr$[i$];
if (!result.contains(str)) {
result.add(str);
}
}
return toStringArray(result);
}
}
public static String[] sortStringArray(String[] array) {
if (ObjectUtils.isEmpty(array)) {
return new String[0];
} else {
Arrays.sort(array);
return array;
}
}
public static String[] toStringArray(Collection<String> collection) {
return collection == null ? null : collection.toArray(new String[collection.size()]);
}
public static String[] toStringArray(Enumeration<String> enumeration) {
if (enumeration == null) {
return null;
} else {
ArrayList list = Collections.list(enumeration);
return (String[]) list.toArray(new String[list.size()]);
}
}
public static String[] trimArrayElements(String[] array) {
if (ObjectUtils.isEmpty(array)) {
return new String[0];
} else {
String[] result = new String[array.length];
for (int i = 0; i < array.length; ++i) {
String element = array[i];
result[i] = element != null ? element.trim() : null;
}
return result;
}
}
public static String[] removeDuplicateStrings(String[] array) {
if (ObjectUtils.isEmpty(array)) {
return array;
} else {
TreeSet set = new TreeSet();
String[] arr$ = array;
int len$ = array.length;
for (int i$ = 0; i$ < len$; ++i$) {
String element = arr$[i$];
set.add(element);
}
return toStringArray(set);
}
}
public static String[] split(String toSplit, String delimiter) {
if (hasLength(toSplit) && hasLength(delimiter)) {
int offset = toSplit.indexOf(delimiter);
if (offset < 0) {
return null;
} else {
String beforeDelimiter = toSplit.substring(0, offset);
String afterDelimiter = toSplit.substring(offset + delimiter.length());
return new String[] {beforeDelimiter, afterDelimiter};
}
} else {
return null;
}
}
public static Properties splitArrayElementsIntoProperties(String[] array, String delimiter) {
return splitArrayElementsIntoProperties(array, delimiter, null);
}
public static Properties splitArrayElementsIntoProperties(String[] array, String delimiter, String charsToDelete) {
if (ObjectUtils.isEmpty(array)) {
return null;
} else {
Properties result = new Properties();
String[] arr$ = array;
int len$ = array.length;
for (int i$ = 0; i$ < len$; ++i$) {
String element = arr$[i$];
if (charsToDelete != null) {
element = deleteAny(element, charsToDelete);
}
String[] splittedElement = split(element, delimiter);
if (splittedElement != null) {
result.setProperty(splittedElement[0].trim(), splittedElement[1].trim());
}
}
return result;
}
}
public static String[] tokenizeToStringArray(String str, String delimiters) {
return tokenizeToStringArray(str, delimiters, true, true);
}
public static String[] tokenizeToStringArray(String str, String delimiters, boolean trimTokens,
boolean ignoreEmptyTokens) {
if (str == null) {
return null;
} else {
StringTokenizer st = new StringTokenizer(str, delimiters);
ArrayList tokens = new ArrayList();
while (st.hasMoreTokens()) {
String token = st.nextToken();
if (trimTokens) {
token = token.trim();
}
if (!ignoreEmptyTokens || token.length() > 0) {
tokens.add(token);
}
}
return toStringArray(tokens);
}
}
public static String[] delimitedListToStringArray(String str, String delimiter) {
return delimitedListToStringArray(str, delimiter, null);
}
public static String[] delimitedListToStringArray(String str, String delimiter, String charsToDelete) {
if (str == null) {
return new String[0];
} else if (delimiter == null) {
return new String[] {str};
} else {
ArrayList result = new ArrayList();
int pos;
if ("".equals(delimiter)) {
for (pos = 0; pos < str.length(); ++pos) {
result.add(deleteAny(str.substring(pos, pos + 1), charsToDelete));
}
} else {
int delPos;
for (pos = 0; (delPos = str.indexOf(delimiter, pos)) != -1; pos = delPos + delimiter.length()) {
result.add(deleteAny(str.substring(pos, delPos), charsToDelete));
}
if (str.length() > 0 && pos <= str.length()) {
result.add(deleteAny(str.substring(pos), charsToDelete));
}
}
return toStringArray(result);
}
}
public static String[] commaDelimitedListToStringArray(String str) {
return delimitedListToStringArray(str, ",");
}
public static Set<String> commaDelimitedListToSet(String str) {
TreeSet set = new TreeSet();
String[] tokens = commaDelimitedListToStringArray(str);
String[] arr$ = tokens;
int len$ = tokens.length;
for (int i$ = 0; i$ < len$; ++i$) {
String token = arr$[i$];
set.add(token);
}
return set;
}
public static String collectionToDelimitedString(Collection<?> coll, String delim, String prefix, String suffix) {
if (CollectionUtils.isEmpty(coll)) {
return "";
} else {
StringBuilder sb = new StringBuilder();
Iterator it = coll.iterator();
while (it.hasNext()) {
sb.append(prefix).append(it.next()).append(suffix);
if (it.hasNext()) {
sb.append(delim);
}
}
return sb.toString();
}
}
public static String collectionToDelimitedString(Collection<?> coll, String delim) {
return collectionToDelimitedString(coll, delim, "", "");
}
public static String collectionToCommaDelimitedString(Collection<?> coll) {
return collectionToDelimitedString(coll, ",");
}
public static String arrayToDelimitedString(Object[] arr, String delim) {
if (ObjectUtils.isEmpty(arr)) {
return "";
} else if (arr.length == 1) {
return ObjectUtils.nullSafeToString(arr[0]);
} else {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < arr.length; ++i) {
if (i > 0) {
sb.append(delim);
}
sb.append(arr[i]);
}
return sb.toString();
}
}
public static String arrayToCommaDelimitedString(Object[] arr) {
return arrayToDelimitedString(arr, ",");
}
}