| Methods Summary |
|---|
| public static java.lang.String | collapse(java.lang.String text)
return collapse( (CharSequence)text ).toString();
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| public static java.lang.CharSequence | collapse(java.lang.CharSequence text)This is usually the biggest processing bottleneck.
int len = text.length();
// most of the texts are already in the collapsed form.
// so look for the first whitespace in the hope that we will
// never see it.
int s=0;
while(s<len) {
if(isWhiteSpace(text.charAt(s)))
break;
s++;
}
if(s==len)
// the input happens to be already collapsed.
return text;
// we now know that the input contains spaces.
// let's sit down and do the collapsing normally.
StringBuilder result = new StringBuilder(len /*allocate enough size to avoid re-allocation*/ );
if(s!=0) {
for( int i=0; i<s; i++ )
result.append(text.charAt(i));
result.append(' ");
}
boolean inStripMode = true;
for (int i = s+1; i < len; i++) {
char ch = text.charAt(i);
boolean b = isWhiteSpace(ch);
if (inStripMode && b)
continue; // skip this character
inStripMode = b;
if (inStripMode)
result.append(' ");
else
result.append(ch);
}
// remove trailing whitespaces
len = result.length();
if (len > 0 && result.charAt(len - 1) == ' ")
result.setLength(len - 1);
// whitespaces are already collapsed,
// so all we have to do is to remove the last one character
// if it's a whitespace.
return result;
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| public static final boolean | isWhiteSpace(java.lang.CharSequence s)Returns true if the specified string is all whitespace.
for( int i=s.length()-1; i>=0; i-- )
if(!isWhiteSpace(s.charAt(i)))
return false;
return true;
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| public static final boolean | isWhiteSpace(char ch)returns true if the specified char is a white space character.
// most of the characters are non-control characters.
// so check that first to quickly return false for most of the cases.
if( ch>0x20 ) return false;
// other than we have to do four comparisons.
return ch == 0x9 || ch == 0xA || ch == 0xD || ch == 0x20;
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| protected static final boolean | isWhiteSpaceExceptSpace(char ch)Returns true if the specified char is a white space character
but not 0x20.
// most of the characters are non-control characters.
// so check that first to quickly return false for most of the cases.
if( ch>=0x20 ) return false;
// other than we have to do four comparisons.
return ch == 0x9 || ch == 0xA || ch == 0xD;
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| public static java.lang.String | replace(java.lang.String text)
return replace( (CharSequence)text ).toString();
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| public static java.lang.CharSequence | replace(java.lang.CharSequence text)
int i=text.length()-1;
// look for the first whitespace char.
while( i>=0 && !isWhiteSpaceExceptSpace(text.charAt(i)) )
i--;
if( i<0 )
// no such whitespace. replace(text)==text.
return text;
// we now know that we need to modify the text.
// allocate a char array to do it.
StringBuilder buf = new StringBuilder(text);
buf.setCharAt(i--,' ");
for( ; i>=0; i-- )
if( isWhiteSpaceExceptSpace(buf.charAt(i)))
buf.setCharAt(i,' ");
return new String(buf);
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| public static java.lang.CharSequence | trim(java.lang.CharSequence text)Equivalent of {@link String#trim()}.
int len = text.length();
int start = 0;
while( start<len && isWhiteSpace(text.charAt(start)) )
start++;
int end = len-1;
while( end>start && isWhiteSpace(text.charAt(end)) )
end--;
if(start==0 && end==len-1)
return text; // no change
else
return text.subSequence(start,end+1);
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