/*
* 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(){}
}