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Merged
merged 2 commits into from
Mar 28, 2015
Merged

join([],sep,pre) #156

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5aa417c
join([],sep.pre)
sxci Mar 26, 2015
b7d2b14
format
sxci Mar 26, 2015
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123 changes: 19 additions & 104 deletions src/main/java/com/qiniu/util/StringUtils.java
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Original file line number Diff line number Diff line change
Expand Up @@ -13,108 +13,25 @@ private StringUtils() {
}

/**
* 以指定的分隔符来进行字符串元素连接
* <p>
* 例如有字符串数组array和连接符为逗号(,)
* <code>
* String[] array = new String[] { "hello", "world", "qiniu", "cloud","storage" };
* </code>
* 那么得到的结果是:
* <code>
* hello,world,qiniu,cloud,storage
* </code>
* </p>
*
* @param array 需要连接的字符串数组
* @param sep 元素连接之间的分隔符
* @return 连接好的新字符串
* @see #join(Object[] array, String sep, String prefix)
*/
public static String join(String[] array, String sep) {
public static String join(Object[] array, String sep) {
return join(array, sep, null);
}

/**
* 以指定的分隔符来进行字符串元素连接
* <p>
* 例如有字符串数组array和连接符为逗号(,)
* <code>
* String[] array = new String[] { "hello", "world", "qiniu", "cloud","storage" };
* </code>
* 那么得到的结果是:
* <code>
* hello,world,qiniu,cloud,storage
* </code>
* </p>
*
* @param array 需要连接的字符串数组
* @param sep 元素连接之间的分隔符
* @param prefix 前缀字符串
* @return 连接好的新字符串
* @see #join(Object[] array, String sep, String prefix)
*/
public static String join(String[] array, String sep, String prefix) {
if (array == null) {
return null;
}

int arraySize = array.length;
int sepSize = 0;
if (sep != null && !sep.equals("")) {
sepSize = sep.length();
}

int bufSize = (arraySize == 0 ? 0 : ((array[0] == null ? 16 : array[0].length()) + sepSize) * arraySize);
StringBuilder buf = new StringBuilder(bufSize);
if (prefix != null) {
buf.append(prefix);
}
for (int i = 0; i < arraySize; i++) {
if (i > 0) {
buf.append(sep);
}
if (array[i] != null) {
buf.append(array[i]);
}
}
return buf.toString();
public static String join(Collection list, String sep) {
return join(list, sep, null);
}

/**
* 以指定的分隔符来进行字符串列表连接
*
* @param list 需要连接的字符串列表
* @param sep 元素连接之间的分隔符
* @param prefix 前缀字符串
* @return 连接好的新字符串
* @see #join(Object[] array, String sep, String prefix)
*/
public static String join(Collection<String> list, String sep, String prefix) {
if (list == null) {
return null;
}
int arraySize = list.size();
if (arraySize == 0) {
return prefix;
}
int sepSize = 0;
if (sep != null && !sep.equals("")) {
sepSize = sep.length();
}
String first = list.iterator().next();
int bufSize = ((first == null ? 16 : first.length()) + sepSize) * arraySize;
StringBuilder buf = new StringBuilder(bufSize);
if (prefix != null) {
buf.append(prefix);
}
int count = 0;
for (String it : list) {
count++;
if (it != null) {
buf.append(it);
if (count < arraySize) {
buf.append(sep);
}
}
}
return buf.toString();
public static String join(Collection list, String sep, String prefix) {
Object[] array = list == null ? null : list.toArray();
return join(array, sep, prefix);
}

/**
Expand All @@ -137,31 +54,29 @@ public static String join(Collection<String> list, String sep, String prefix) {
*/
public static String join(Object[] array, String sep, String prefix) {
if (array == null) {
return null;
return "";
}

int arraySize = array.length;

if (arraySize == 0) {
return prefix;
return "";
}
int sepSize = 0;
if (sep != null && !sep.equals("")) {
sepSize = sep.length();

if (sep == null) {
sep = "";
}

int bufSize = ((array[0] == null ? 16 : array[0].toString().length()) + sepSize) * arraySize;
StringBuilder buf = new StringBuilder(bufSize);
if (prefix != null) {
buf.append(prefix);
if (prefix == null) {
prefix = "";
}

StringBuilder buf = new StringBuilder(prefix);
for (int i = 0; i < arraySize; i++) {
if (i > 0) {
buf.append(sep);
}
if (array[i] != null) {
buf.append(array[i]);
}
buf.append(array[i] == null ? "" : array[i]);
}
return buf.toString();
}
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