/*******************************************************************************
* Copyright 2011, 2012, 2013 fanfou.com, Xiaoke, Zhang
*
* 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.fanfou.app.opensource.util;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.UnsupportedEncodingException;
import java.math.BigInteger;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import com.fanfou.app.opensource.AppContext;
/**
* @author mcxiaoke
* @version 1.0 2011.05.19
* @version 1.1 2011.11.22
* @version 1.2 2011.12.02
*
*/
public class StringHelper {
// Regex that matches characters that have special meaning in HTML. '<',
// '>', '&' and
// multiple continuous spaces.
private static final Pattern PLAIN_TEXT_TO_ESCAPE = Pattern
.compile("[<>&]| {2,}|\r?\n");
/**
* converts given byte array to a hex string
*
* @param bytes
* @return
*/
public static String byteArrayToHexString(final byte[] bytes) {
final StringBuffer buffer = new StringBuffer();
for (final byte b : bytes) {
if ((b & 0xff) < 0x10) {
buffer.append("0");
}
buffer.append(Long.toString(b & 0xff, 16));
}
return buffer.toString();
}
public static String bytesToHexString(final byte[] bytes) {
// http://stackoverflow.com/questions/332079
final StringBuffer sb = new StringBuffer();
for (final byte b : bytes) {
final String hex = Integer.toHexString(0xFF & b);
if (hex.length() == 1) {
sb.append('0');
}
sb.append(hex);
}
return sb.toString();
}
/**
* @param s
* 原始消息字符串
* @return 自动截断超过140个字符的消息，取前面133个字符，并添加...，预留转发的字符位置
*/
public static String cut(final String s) {
final String str = s.trim();
final StringBuilder sb = new StringBuilder();
if (str.length() > 140) {
return sb.append(str.substring(0, 135)).append("...").toString();
} else {
return str;
}
}
public static String encode(final String value) {
String encoded = null;
try {
encoded = URLEncoder.encode(value, "UTF-8");
} catch (final UnsupportedEncodingException ignore) {
}
final StringBuffer buf = new StringBuffer(encoded.length());
char focus;
for (int i = 0; i < encoded.length(); i++) {
focus = encoded.charAt(i);
if (focus == '*') {
buf.append("%2A");
} else if (focus == '+') {
buf.append("%20");
} else if ((focus == '%') && ((i + 1) < encoded.length())
&& (encoded.charAt(i + 1) == '7')
&& (encoded.charAt(i + 2) == 'E')) {
buf.append('~');
i += 2;
} else {
buf.append(focus);
}
}
return buf.toString();
}
/**
* Escape some special character as HTML escape sequence.
*
* @param text
* Text to be displayed using WebView.
* @return Text correctly escaped.
*/
public static String escapeCharacterToDisplay(String text) {
final Pattern pattern = StringHelper.PLAIN_TEXT_TO_ESCAPE;
final Matcher match = pattern.matcher(text);
if (match.find()) {
final StringBuilder out = new StringBuilder();
int end = 0;
do {
final int start = match.start();
out.append(text.substring(end, start));
end = match.end();
final int c = text.codePointAt(start);
if (c == ' ') {
// Escape successive spaces into series of " ".
for (int i = 1, n = end - start; i < n; ++i) {
out.append(" ");
}
out.append(' ');
} else if ((c == '\r') || (c == '\n')) {
out.append("<br>");
} else if (c == '<') {
out.append("<");
} else if (c == '>') {
out.append(">");
} else if (c == '&') {
out.append("&");
}
} while (match.find());
out.append(text.substring(end));
text = out.toString();
}
return text;
}
public static String getStackMessageString(final Throwable e) {
final StringBuffer message = new StringBuffer();
final StackTraceElement[] stack = e.getStackTrace();
final StackTraceElement stackLine = stack[stack.length - 1];
message.append(stackLine.getFileName());
message.append(":");
message.append(stackLine.getLineNumber());
message.append(":");
message.append(stackLine.getMethodName());
message.append(" ");
message.append(e.getMessage());
return message.toString();
}
public static String getStackTraceString(final Throwable tr) {
if (tr == null) {
return "";
}
final StringWriter sw = new StringWriter();
final PrintWriter pw = new PrintWriter(sw);
tr.printStackTrace(pw);
return sw.toString();
}
/**
* converts given hex string to a byte array (ex: "0D0A" => {0x0D, 0x0A,})
*
* @param str
* @return
*/
public static final byte[] hexStringToByteArray(final String str) {
int i = 0;
final byte[] results = new byte[str.length() / 2];
for (int k = 0; k < str.length();) {
results[i] = (byte) (Character.digit(str.charAt(k++), 16) << 4);
results[i] += (byte) (Character.digit(str.charAt(k++), 16));
i++;
}
return results;
}
/**
* @param s
* 原始字符串
* @return 判断字符串是否为空
*/
public static boolean isEmpty(final String s) {
return (s == null) || s.trim().equals("");
}
public static String join(final Collection<?> items, final String delimiter) {
if ((items == null) || items.isEmpty()) {
return "";
}
final Iterator<?> iter = items.iterator();
final StringBuilder buffer = new StringBuilder(iter.next().toString());
while (iter.hasNext()) {
buffer.append(delimiter).append(iter.next());
}
return buffer.toString();
}
public static String join(final String separator, final Integer[] integers) {
if (integers == null) {
return null;
}
if (integers.length == 0) {
return "";
}
final StringBuilder builder = new StringBuilder(integers[0].toString());
for (int i = 1, length = integers.length; i < length; i++) {
builder.append(separator);
builder.append(integers[i]);
}
return builder.toString();
}
public static String join(final String separator, final String[] strings) {
if (strings == null) {
return null;
}
if (strings.length == 0) {
return "";
}
final StringBuilder builder = new StringBuilder(strings[0]);
for (int i = 1, length = strings.length; i < length; i++) {
builder.append(separator);
builder.append(strings[i]);
}
return builder.toString();
}
public static String md5(final String s) {
final StringBuffer result = new StringBuffer();
try {
final MessageDigest md = MessageDigest.getInstance("MD5");
md.update(s.getBytes());
final byte digest[] = md.digest();
for (final byte element : digest) {
result.append(Integer.toHexString(0xFF & element));
}
} catch (final NoSuchAlgorithmException e) {
e.printStackTrace();
}
return (result.toString());
}
/**
* MD5加密函数
*
* @param str
* 要加密的字符串
* @return 加密后的字符串
*/
public static String md5old(final String str) {
if ((str == null) || ("".equals(str.trim()))) {
return str;
} else {
MessageDigest messageDigest = null;
try {
messageDigest = MessageDigest.getInstance("MD5");
messageDigest.reset();
messageDigest.update(str.getBytes("UTF-8"));
} catch (final NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (final UnsupportedEncodingException e) {
e.printStackTrace();
}
final byte[] byteArray = messageDigest.digest();
final StringBuffer md5StrBuff = new StringBuffer();
for (final byte element : byteArray) {
if (Integer.toHexString(0xFF & element).length() == 1) {
md5StrBuff.append("0").append(
Integer.toHexString(0xFF & element));
} else {
md5StrBuff.append(Integer.toHexString(0xFF & element));
}
}
return md5StrBuff.toString();
}
}
/**
*
* @param original
* @return null if fails
*/
public static String md5sum(final byte[] original) {
try {
final MessageDigest md = MessageDigest.getInstance("MD5");
md.update(original, 0, original.length);
final StringBuffer md5sum = new StringBuffer(new BigInteger(1,
md.digest()).toString(16));
while (md5sum.length() < 32) {
md5sum.insert(0, "0");
}
return md5sum.toString();
} catch (final NoSuchAlgorithmException e) {
if (AppContext.DEBUG) {
e.printStackTrace();
}
}
return null;
}
/**
*
* @param original
* @return null if fails
*/
public static String md5sum(final String original) {
return StringHelper.md5sum(original.getBytes());
}
/**
* 字符串转化为数字
*
* @param s
* 字符串参数
* @return 字符串代表的数字，如果无法转换，返回0
*/
public static int toInt(final String s) {
try {
return Integer.parseInt(s);
} catch (final NumberFormatException e) {
return -1;
}
}
public static String toString(final List<String> array) {
if ((array == null) || (array.size() == 0)) {
return "";
}
final StringBuilder sb = new StringBuilder();
sb.append("(");
for (int i = 0; i < array.size(); i++) {
if (i > 0) {
sb.append(", ");
}
sb.append(array.get(i));
}
sb.append(")");
return sb.toString();
}
public static String toString(final String[] array) {
if ((array == null) || (array.length == 0)) {
return "";
}
final StringBuilder sb = new StringBuilder();
sb.append("(");
for (int i = 0; i < array.length; i++) {
if (i > 0) {
sb.append(", ");
}
sb.append(array[i]);
}
sb.append(")");
return sb.toString();
}
/**
*
* @param encoded
* @return null if fails
*/
public static String urldecode(final String encoded) {
try {
return URLDecoder.decode(encoded, "utf-8");
} catch (final UnsupportedEncodingException e) {
if (AppContext.DEBUG) {
e.printStackTrace();
}
}
return null;
}
/**
*
* @param original
* @return null if fails
*/
public static String urlencode(final String original) {
try {
// return URLEncoder.encode(original, "utf-8");
// fixed: to comply with RFC-3986
return URLEncoder.encode(original, "utf-8").replace("+", "%20")
.replace("*", "%2A").replace("%7E", "~");
} catch (final UnsupportedEncodingException e) {
if (AppContext.DEBUG) {
e.printStackTrace();
}
}
return null;
}
}