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scouter.util.StringUtil Maven / Gradle / Ivy
/*
* Copyright 2015 the original author or authors.
* @https://github.com/scouter-project/scouter
*
* 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.
*
* For this class
* many of method names
* basic ideas
* are from org.apache.commons.lang3.StringUtils.java
*
*/
package scouter.util;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.StringTokenizer;
public class StringUtil {
public static String firstWord(String target, String delim) {
if (target == null || target.length() == 0) {
return "";
}
StringTokenizer nizer = new StringTokenizer(target, delim);
while (nizer.hasMoreTokens()) {
return trimEmpty(nizer.nextToken());
}
return "";
}
public static String lastWord(String target, String delim) {
if (target == null || target.length() == 0 || delim.length() == 0) {
return "";
}
String value = "";
StringTokenizer nizer = new StringTokenizer(target, delim);
while (nizer.hasMoreTokens()) {
value = trimEmpty(nizer.nextToken());
}
return value;
}
public static String[] tokenizer(String target, String delim) {
if (target == null || target.length() == 0) {
return null;
}
StringTokenizer nizer = new StringTokenizer(target, delim);
ArrayList arr = new ArrayList();
while (nizer.hasMoreTokens()) {
String s = trimEmpty(nizer.nextToken());
if (s.length() > 0) {
arr.add(s);
}
}
return arr.toArray(new String[arr.size()]);
}
public static String lowerFirst(String str) {
if (isEmpty(str)) {
return str;
}
char[] buffer = str.toCharArray();
buffer[0] = Character.toLowerCase(buffer[0]);
return new String(buffer);
}
public static String upperFirst(String str) {
if (isEmpty(str)) {
return str;
}
char[] buffer = str.toCharArray();
buffer[0] = Character.toUpperCase(buffer[0]);
return new String(buffer);
}
public static String erase(String str, String delim) {
if (str == null || delim == null)
return str;
StringTokenizer tor = new StringTokenizer(str, delim);
StringBuffer sb = new StringBuffer(str.length());
while (tor.hasMoreTokens()) {
sb.append(tor.nextToken());
}
return sb.toString();
}
public static String limiting(String s, int max) {
if (s == null)
return null;
if (s.length() > max)
return s.substring(0, max);
return s;
}
public static String trim(String s) {
return s == null ? null : s.trim();
}
public static String trimEmpty(String s) {
return s == null ? "" : s.trim();
}
public static String trimToEmpty(String s) {
return trimEmpty(s);
}
public static String nullToEmpty(String s) {
return s == null ? "" : s;
}
public static boolean isEmpty(String s) {
return s == null || s.length() == 0;
}
public static boolean isNotEmpty(String s) {
return s != null && s.length() > 0;
}
public static String[] split(String s, char c) {
ArrayList arr = new ArrayList();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < s.length(); i++) {
if (s.charAt(i) == c) {
if (sb.length() > 0) {
arr.add(sb.toString());
sb = new StringBuilder();
}
} else {
sb.append(s.charAt(i));
}
}
if (sb.length() > 0) {
arr.add(sb.toString());
sb = new StringBuilder();
}
return arr.toArray(new String[arr.size()]);
}
public static ArrayList splitAsList(String s, char c) {
ArrayList arr = new ArrayList();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < s.length(); i++) {
if (s.charAt(i) == c) {
if (sb.length() > 0) {
arr.add(sb.toString());
sb = new StringBuilder();
}
} else {
sb.append(s.charAt(i));
}
}
if (sb.length() > 0) {
arr.add(sb.toString());
sb = new StringBuilder();
}
return arr;
}
public static String[] splitByWholeSeparatorPreserveAllTokens(String s, char c) {
ArrayList arr = new ArrayList();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < s.length(); i++) {
if (s.charAt(i) == c) {
if (sb.length() > 0) {
arr.add(sb.toString());
sb = new StringBuilder();
} else {
arr.add("");
sb = new StringBuilder();
}
} else {
sb.append(s.charAt(i));
}
}
if (sb.length() > 0) {
arr.add(sb.toString());
sb = new StringBuilder();
}
return arr.toArray(new String[arr.size()]);
}
public static HashSet splitAndTrimToSet(String s, char c, boolean toUpper) {
HashSet set = new HashSet();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < s.length(); i++) {
if (s.charAt(i) == c) {
if (sb.length() > 0) {
set.add(toUpper ? sb.toString().toUpperCase().trim() : sb.toString().trim());
sb = new StringBuilder();
}
} else {
sb.append(s.charAt(i));
}
}
if (sb.length() > 0) {
set.add(toUpper ? sb.toString().toUpperCase().trim() : sb.toString().trim());
}
return set;
}
public static String[] split(String s, String delim) {
ArrayList arr = new ArrayList();
while (s.length() > 0) {
int pos = s.indexOf(delim);
if (pos < 0) {
arr.add(s);
s = "";
} else if (pos > 0) {
arr.add(s.substring(0, pos));
s = s.substring(pos + delim.length());
} else {
s = s.substring(delim.length());
}
}
return arr.toArray(new String[arr.size()]);
}
public static String removeWhitespace(String str) {
if (isEmpty(str)) {
return str;
}
int strLength = str.length();
StringBuffer sb = new StringBuffer(strLength);
for (int i = 0; i < strLength; i++) {
if (!Character.isWhitespace(str.charAt(i))) {
sb.append(str.charAt(i));
}
}
if (sb.length() == strLength)
return str;
return sb.toString();
}
public static String remove(String str, char ch) {
if (isEmpty(str)) {
return str;
}
int strLength = str.length();
StringBuffer sb = new StringBuffer(strLength);
for (int i = 0; i < strLength; i++) {
if (str.charAt(i) != ch) {
sb.append(str.charAt(i));
}
}
if (sb.length() == strLength)
return str;
return sb.toString();
}
public static String strip(String str, String striped) {
if (isEmpty(str)) {
return str;
}
StringBuffer sb = new StringBuffer(str.length());
StringTokenizer niz = new StringTokenizer(str, striped);
while (niz.hasMoreTokens()) {
sb.append(niz.nextToken());
}
return sb.toString();
}
public static String leftPad(String str, int size) {
if (str == null || str.length() >= size) {
return str;
}
StringBuffer sb = new StringBuffer(size);
int len = size - str.length();
for (int i = 0; i < len; i++) {
sb.append(' ');
}
sb.append(str);
return sb.toString();
}
public static String cutLastString(String className, char delim) {
int x = className.lastIndexOf(delim);
if (x > 0)
return className.substring(x + 1);
return className;
}
public static String removeLastString(String className, char delim) {
int x = className.lastIndexOf(delim);
if (x > 0)
return className.substring(0, x);
return className;
}
public static String[] divKeyValue(String line, String delim) {
int x = line.indexOf(delim);
if (x < 0)
return new String[] { line };
String s1 = line.substring(0, x );
String s2 = line.substring(x + 1);
return new String[] { s1, s2 };
}
public static String toString(StringEnumer enu) {
if (enu.hasMoreElements()) {
StringBuffer sb = new StringBuffer();
sb.append("[").append(enu.nextString());
while (enu.hasMoreElements()) {
sb.append(", ").append(enu.nextString());
}
sb.append("]");
return sb.toString();
} else {
return "[]";
}
}
public static String toString(IntEnumer enu) {
if (enu.hasMoreElements()) {
StringBuffer sb = new StringBuffer();
sb.append("[").append(enu.nextInt());
while (enu.hasMoreElements()) {
sb.append(", ").append(enu.nextInt());
}
sb.append("]");
return sb.toString();
} else {
return "[]";
}
}
public static String toString(LongEnumer enu) {
if (enu.hasMoreElements()) {
StringBuffer sb = new StringBuffer();
sb.append("[").append(enu.nextLong());
while (enu.hasMoreElements()) {
sb.append(", ").append(enu.nextLong());
}
sb.append("]");
return sb.toString();
} else {
return "[]";
}
}
public static String truncate(String str, int len) {
return str == null || str.length() <= len ? str : str.substring(0, len);
}
public static String rpad(String str, int len) {
if (str == null) {
return padding(len, ' ');
}
int slen = str.length();
if (slen >= len)
return str;
return str + padding(len - slen, ' ');
}
public static String lpad(String str, int len) {
if (str == null) {
return padding(len, ' ');
}
int slen = str.length();
if (slen >= len)
return str;
return padding(len - slen, ' ') + str;
}
public static String padding(int len, char ch) {
StringBuffer sb = new StringBuffer(len);
for (int i = 0; i < len; i++) {
sb.append(ch);
}
return sb.toString();
}
public static int getWordCount(String text, String word) {
int n = 0;
int x = text.indexOf(word);
while (x >= 0) {
n++;
x = text.indexOf(word, x + word.length());
}
return n;
}
public static String stripSideChar(String str, char ch) {
if (isEmpty(str) || str.length() <= 1) {
return str;
}
if (str.charAt(0) == ch && str.charAt(str.length() - 1) == ch) {
return str.substring(1, str.length() -1);
} else if (str.charAt(0) == ch) {
return str.substring(1);
} else if (str.charAt(str.length() - 1) == ch) {
return str.substring(0, str.length() -1);
}
return str;
}
public static String emptyToDefault(String text, String defaultText) {
if (StringUtil.isEmpty(StringUtil.trimToEmpty(text))) {
return defaultText;
} else {
return text;
}
}
public static boolean isInteger(String s) {
try {
Integer.parseInt(s);
} catch(NumberFormatException e) {
return false;
} catch(NullPointerException e) {
return false;
}
// only got here if we didn't return false
return true;
}
}
