com.alibaba.nacos.client.utils.StringUtils Maven / Gradle / Ivy
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/*
* Copyright 1999-2018 Alibaba Group Holding Ltd.
*
* 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 com.alibaba.nacos.client.utils;
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.util.Collection;
import java.util.Locale;
/**
* string util
*
* @author Nacos
* @deprecated Use {@link org.apache.commons.lang3.StringUtils} instead
*/
@Deprecated
public class StringUtils {
private static final int INDEX_NOT_FOUND = -1;
public static final String EMPTY = "";
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))) {
return false;
}
}
return true;
}
public static boolean isNotBlank(String str) {
return !isBlank(str);
}
public static boolean isNotEmpty(String str) {
return !StringUtils.isEmpty(str);
}
public static boolean isEmpty(String str) {
return str == null || str.length() == 0;
}
public static String defaultIfEmpty(String str, String defaultStr) {
return StringUtils.isEmpty(str) ? defaultStr : str;
}
public static boolean equals(String str1, String str2) {
return str1 == null ? str2 == null : str1.equals(str2);
}
public static String substringBetween(String str, String open, String close) {
if (str == null || open == null || close == null) {
return null;
}
int start = str.indexOf(open);
if (start != INDEX_NOT_FOUND) {
int end = str.indexOf(close, start + open.length());
if (end != INDEX_NOT_FOUND) {
return str.substring(start + open.length(), end);
}
}
return null;
}
public static String join(Collection collection, String separator) {
if (collection == null) {
return null;
}
StringBuilder stringBuilder = new StringBuilder();
Object[] objects = collection.toArray();
for (int i = 0; i < collection.size() - 1; i++) {
stringBuilder.append(objects[i].toString()).append(separator);
}
if (collection.size() > 0) {
stringBuilder.append(objects[collection.size() - 1]);
}
return stringBuilder.toString();
}
public static String escapeJavaScript(String str) {
return escapeJavaStyleString(str, true, true);
}
private static String escapeJavaStyleString(String str, boolean escapeSingleQuotes, boolean escapeForwardSlash) {
if (str == null) {
return null;
}
try {
StringWriter writer = new StringWriter(str.length() * 2);
escapeJavaStyleString(writer, str, escapeSingleQuotes, escapeForwardSlash);
return writer.toString();
} catch (IOException ioe) {
// this should never ever happen while writing to a StringWriter
return null;
}
}
private static String hex(char ch) {
return Integer.toHexString(ch).toUpperCase(Locale.ENGLISH);
}
private static void escapeJavaStyleString(Writer out, String str, boolean escapeSingleQuote,
boolean escapeForwardSlash) throws IOException {
if (out == null) {
throw new IllegalArgumentException("The Writer must not be null");
}
if (str == null) {
return;
}
int sz;
sz = str.length();
for (int i = 0; i < sz; i++) {
char ch = str.charAt(i);
// handle unicode
if (ch > 0xfff) {
out.write("\\u" + hex(ch));
} else if (ch > 0xff) {
out.write("\\u0" + hex(ch));
} else if (ch > 0x7f) {
out.write("\\u00" + hex(ch));
} else if (ch < 32) {
switch (ch) {
case '\b':
out.write('\\');
out.write('b');
break;
case '\n':
out.write('\\');
out.write('n');
break;
case '\t':
out.write('\\');
out.write('t');
break;
case '\f':
out.write('\\');
out.write('f');
break;
case '\r':
out.write('\\');
out.write('r');
break;
default:
if (ch > 0xf) {
out.write("\\u00" + hex(ch));
} else {
out.write("\\u000" + hex(ch));
}
break;
}
} else {
switch (ch) {
case '\'':
if (escapeSingleQuote) {
out.write('\\');
}
out.write('\'');
break;
case '"':
out.write('\\');
out.write('"');
break;
case '\\':
out.write('\\');
out.write('\\');
break;
case '/':
if (escapeForwardSlash) {
out.write('\\');
}
out.write('/');
break;
default:
out.write(ch);
break;
}
}
}
}
}