/* | |
* Copyright 1999-2011 Alibaba Group. | |
* | |
* 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.dubbo.common.utils; | |
import java.io.IOException; | |
import java.io.PrintWriter; | |
import java.util.ArrayList; | |
import java.util.Collection; | |
import java.util.HashMap; | |
import java.util.List; | |
import java.util.Map; | |
import java.util.TreeMap; | |
import java.util.regex.Matcher; | |
import java.util.regex.Pattern; | |
import com.alibaba.dubbo.common.Constants; | |
import com.alibaba.dubbo.common.io.UnsafeStringWriter; | |
import com.alibaba.dubbo.common.json.JSON; | |
import com.alibaba.dubbo.common.logger.Logger; | |
import com.alibaba.dubbo.common.logger.LoggerFactory; | |
/** | |
* StringUtils | |
* | |
* @author qian.lei | |
*/ | |
public final class StringUtils { | |
private static final Logger logger = LoggerFactory.getLogger(StringUtils.class); | |
public static final String[] EMPTY_STRING_ARRAY = new String[0]; | |
private static final Pattern KVP_PATTERN = Pattern.compile("([_.a-zA-Z0-9][-_.a-zA-Z0-9]*)[=](.*)"); //key value pair pattern. | |
private static final Pattern INT_PATTERN = Pattern.compile("^\\d+$"); | |
public static boolean isBlank(String str) | |
{ | |
if( str == null || str.length() == 0 ) | |
return true; | |
return false; | |
} | |
/** | |
* is empty string. | |
* | |
* @param str source string. | |
* @return is empty. | |
*/ | |
public static boolean isEmpty(String str) | |
{ | |
if( str == null || str.length() == 0 ) | |
return true; | |
return false; | |
} | |
/** | |
* is not empty string. | |
* | |
* @param str source string. | |
* @return is not empty. | |
*/ | |
public static boolean isNotEmpty(String str) | |
{ | |
return str != null && str.length() > 0; | |
} | |
/** | |
* | |
* @param s1 | |
* @param s2 | |
* @return equals | |
*/ | |
public static boolean isEquals(String s1, String s2) { | |
if (s1 == null && s2 == null) | |
return true; | |
if (s1 == null || s2 == null) | |
return false; | |
return s1.equals(s2); | |
} | |
/** | |
* is integer string. | |
* | |
* @param str | |
* @return is integer | |
*/ | |
public static boolean isInteger(String str) { | |
if (str == null || str.length() == 0) | |
return false; | |
return INT_PATTERN.matcher(str).matches(); | |
} | |
public static int parseInteger(String str) { | |
if (! isInteger(str)) | |
return 0; | |
return Integer.parseInt(str); | |
} | |
/** | |
* Returns true if s is a legal Java identifier.<p> | |
* <a href="http://www.exampledepot.com/egs/java.lang/IsJavaId.html">more info.</a> | |
*/ | |
public static boolean isJavaIdentifier(String s) { | |
if (s.length() == 0 || !Character.isJavaIdentifierStart(s.charAt(0))) { | |
return false; | |
} | |
for (int i=1; i<s.length(); i++) { | |
if (!Character.isJavaIdentifierPart(s.charAt(i))) { | |
return false; | |
} | |
} | |
return true; | |
} | |
public static boolean isContains(String values, String value) { | |
if (values == null || values.length() == 0) { | |
return false; | |
} | |
return isContains(Constants.COMMA_SPLIT_PATTERN.split(values), value); | |
} | |
/** | |
* | |
* @param values | |
* @param value | |
* @return contains | |
*/ | |
public static boolean isContains(String[] values, String value) { | |
if (value != null && value.length() > 0 && values != null && values.length > 0) { | |
for (String v : values) { | |
if (value.equals(v)) { | |
return true; | |
} | |
} | |
} | |
return false; | |
} | |
public static boolean isNumeric(String str) { | |
if (str == null) { | |
return false; | |
} | |
int sz = str.length(); | |
for (int i = 0; i < sz; i++) { | |
if (Character.isDigit(str.charAt(i)) == false) { | |
return false; | |
} | |
} | |
return true; | |
} | |
/** | |
* | |
* @param e | |
* @return string | |
*/ | |
public static String toString(Throwable e) { | |
UnsafeStringWriter w = new UnsafeStringWriter(); | |
PrintWriter p = new PrintWriter(w); | |
p.print(e.getClass().getName()); | |
if (e.getMessage() != null) { | |
p.print(": " + e.getMessage()); | |
} | |
p.println(); | |
try { | |
e.printStackTrace(p); | |
return w.toString(); | |
} finally { | |
p.close(); | |
} | |
} | |
/** | |
* | |
* @param msg | |
* @param e | |
* @return string | |
*/ | |
public static String toString(String msg, Throwable e) { | |
UnsafeStringWriter w = new UnsafeStringWriter(); | |
w.write(msg + "\n"); | |
PrintWriter p = new PrintWriter(w); | |
try { | |
e.printStackTrace(p); | |
return w.toString(); | |
} finally { | |
p.close(); | |
} | |
} | |
/** | |
* translat. | |
* | |
* @param src source string. | |
* @param from src char table. | |
* @param to target char table. | |
* @return String. | |
*/ | |
public static String translat(String src, String from, String to) | |
{ | |
if( isEmpty(src) ) return src; | |
StringBuilder sb = null; | |
int ix; | |
char c; | |
for(int i=0,len=src.length();i<len;i++) | |
{ | |
c = src.charAt(i); | |
ix = from.indexOf(c); | |
if( ix == -1 ) | |
{ | |
if( sb != null ) | |
sb.append(c); | |
} | |
else | |
{ | |
if( sb == null ) | |
{ | |
sb = new StringBuilder(len); | |
sb.append(src, 0, i); | |
} | |
if( ix < to.length() ) | |
sb.append(to.charAt(ix)); | |
} | |
} | |
return sb == null ? src : sb.toString(); | |
} | |
/** | |
* split. | |
* | |
* @param ch char. | |
* @return string array. | |
*/ | |
public static String[] split(String str, char ch) | |
{ | |
List<String> list = null; | |
char c; | |
int ix = 0,len=str.length(); | |
for(int i=0;i<len;i++) | |
{ | |
c = str.charAt(i); | |
if( c == ch ) | |
{ | |
if( list == null ) | |
list = new ArrayList<String>(); | |
list.add(str.substring(ix, i)); | |
ix = i + 1; | |
} | |
} | |
if( ix > 0 ) | |
list.add(str.substring(ix)); | |
return list == null ? EMPTY_STRING_ARRAY : (String[])list.toArray(EMPTY_STRING_ARRAY); | |
} | |
/** | |
* join string. | |
* | |
* @param array String array. | |
* @return String. | |
*/ | |
public static String join(String[] array) | |
{ | |
if( array.length == 0 ) return ""; | |
StringBuilder sb = new StringBuilder(); | |
for( String s : array ) | |
sb.append(s); | |
return sb.toString(); | |
} | |
/** | |
* join string like javascript. | |
* | |
* @param array String array. | |
* @param split split | |
* @return String. | |
*/ | |
public static String join(String[] array, char split) | |
{ | |
if( array.length == 0 ) return ""; | |
StringBuilder sb = new StringBuilder(); | |
for(int i=0;i<array.length;i++) | |
{ | |
if( i > 0 ) | |
sb.append(split); | |
sb.append(array[i]); | |
} | |
return sb.toString(); | |
} | |
/** | |
* join string like javascript. | |
* | |
* @param array String array. | |
* @param split split | |
* @return String. | |
*/ | |
public static String join(String[] array, String split) | |
{ | |
if( array.length == 0 ) return ""; | |
StringBuilder sb = new StringBuilder(); | |
for(int i=0;i<array.length;i++) | |
{ | |
if( i > 0 ) | |
sb.append(split); | |
sb.append(array[i]); | |
} | |
return sb.toString(); | |
} | |
public static String join(Collection<String> coll, String split) { | |
if(coll.isEmpty()) return ""; | |
StringBuilder sb = new StringBuilder(); | |
boolean isFirst = true; | |
for(String s : coll) { | |
if(isFirst) isFirst = false; else sb.append(split); | |
sb.append(s); | |
} | |
return sb.toString(); | |
} | |
/** | |
* parse key-value pair. | |
* | |
* @param str string. | |
* @param itemSeparator item separator. | |
* @return key-value map; | |
*/ | |
private static Map<String, String> parseKeyValuePair(String str, String itemSeparator) | |
{ | |
String[] tmp = str.split(itemSeparator); | |
Map<String, String> map = new HashMap<String, String>(tmp.length); | |
for(int i=0;i<tmp.length;i++) | |
{ | |
Matcher matcher = KVP_PATTERN.matcher(tmp[i]); | |
if( matcher.matches() == false ) | |
continue; | |
map.put(matcher.group(1), matcher.group(2)); | |
} | |
return map; | |
} | |
public static String getQueryStringValue(String qs, String key) { | |
Map<String, String> map = StringUtils.parseQueryString(qs); | |
return map.get(key); | |
} | |
/** | |
* parse query string to Parameters. | |
* | |
* @param qs query string. | |
* @return Parameters instance. | |
*/ | |
public static Map<String, String> parseQueryString(String qs) | |
{ | |
if( qs == null || qs.length() == 0 ) | |
return new HashMap<String, String>(); | |
return parseKeyValuePair(qs, "\\&"); | |
} | |
public static String getServiceKey(Map<String, String> ps) { | |
StringBuilder buf = new StringBuilder(); | |
String group = ps.get(Constants.GROUP_KEY); | |
if (group != null && group.length()>0){ | |
buf.append(group).append("/"); | |
} | |
buf.append(ps.get(Constants.INTERFACE_KEY)); | |
String version = ps.get(Constants.VERSION_KEY); | |
if (version!= null && version.length()>0){ | |
buf.append(":").append(version); | |
} | |
return buf.toString(); | |
} | |
public static String toQueryString(Map<String, String> ps) { | |
StringBuilder buf = new StringBuilder(); | |
if (ps != null && ps.size() > 0) { | |
for (Map.Entry<String, String> entry : new TreeMap<String, String>(ps).entrySet()) { | |
String key = entry.getKey(); | |
String value = entry.getValue(); | |
if (key != null && key.length() > 0 | |
&& value != null && value.length() > 0) { | |
if (buf.length() > 0) { | |
buf.append("&"); | |
} | |
buf.append(key); | |
buf.append("="); | |
buf.append(value); | |
} | |
} | |
} | |
return buf.toString(); | |
} | |
public static String camelToSplitName(String camelName, String split) { | |
if (camelName == null || camelName.length() == 0) { | |
return camelName; | |
} | |
StringBuilder buf = null; | |
for (int i = 0; i < camelName.length(); i ++) { | |
char ch = camelName.charAt(i); | |
if (ch >= 'A' && ch <= 'Z') { | |
if (buf == null) { | |
buf = new StringBuilder(); | |
if (i > 0) { | |
buf.append(camelName.substring(0, i)); | |
} | |
} | |
if (i > 0) { | |
buf.append(split); | |
} | |
buf.append(Character.toLowerCase(ch)); | |
} else if (buf != null) { | |
buf.append(ch); | |
} | |
} | |
return buf == null ? camelName : buf.toString(); | |
} | |
public static String toArgumentString(Object[] args) { | |
StringBuilder buf = new StringBuilder(); | |
for (Object arg : args) { | |
if (buf.length() > 0) { | |
buf.append(Constants.COMMA_SEPARATOR); | |
} | |
if (arg == null || ReflectUtils.isPrimitives(arg.getClass())) { | |
buf.append(arg); | |
} else { | |
try { | |
buf.append(JSON.json(arg)); | |
} catch (IOException e) { | |
logger.warn(e.getMessage(), e); | |
buf.append(arg); | |
} | |
} | |
} | |
return buf.toString(); | |
} | |
private StringUtils(){} | |
} |