net.e6tech.elements.common.util.StringUtil Maven / Gradle / Ivy
/*
* Copyright 2017 Futeh Kao
*
* 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 net.e6tech.elements.common.util;
import java.util.Arrays;
/**
* Created by futeh.
*/
public class StringUtil {
private StringUtil() {
}
public static boolean isNullOrEmpty(String p) {
return (p == null) || p.trim().isEmpty();
}
public static String padLeft(String content, int width, char padding) {
return pad(content, width, padding, false);
}
public static String padRight(String content, int width, char padding) {
return pad(content, width, padding, true);
}
public static String pad(String content, int width, char padding, boolean leftAligned) {
String str = "";
if (content != null)
str = content;
int diff = width - str.length();
if (diff <= 0)
return str;
char[] chars = new char[diff];
Arrays.fill(chars, padding);
if (leftAligned)
return str + new String(chars);
else return new String(chars) + str;
}
public static String trim(String s) {
if (s == null)
return null;
int start = 0;
int end = s.length() - 1;
while (start <= end && Character.isWhitespace(s.charAt(start)))
start++;
while (end > start && Character.isWhitespace(s.charAt(end)))
end--;
return s.substring(start, end + 1);
}
public static boolean isNotBlank(String str) {
return !StringUtil.isBlank(str);
}
public static boolean isBlank(String str) {
int strLen;
if (str == null || (strLen = str.length()) == 0) {
return true;
}
for (int i = 0; i < strLen; i++) {
if ((Character.isWhitespace(str.charAt(i)) == false)) {
return false;
}
}
return true;
}
}