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8200377: String::strip, String::stripLeading, String::stripTrailing

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Reviewed-by: sundar, rriggs
This commit is contained in:
Jim Laskey 2018-05-14 09:40:48 -03:00
parent ec2d9845e0
commit 7906014509
4 changed files with 300 additions and 1 deletions
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51
src/java.base/share/classes/java/lang/StringLatin1.java
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@ -538,6 +538,57 @@ final class StringLatin1 {
newString(value, st, len - st) : null;
}
public static int indexOfNonWhitespace(byte[] value) {
int length = value.length;
int left = 0;
while (left < length) {
char ch = (char)(value[left] & 0xff);
if (ch != ' ' && ch != '\t' && !Character.isWhitespace(ch)) {
break;
}
left++;
}
return left;
}
public static int lastIndexOfNonWhitespace(byte[] value) {
int length = value.length;
int right = length;
while (0 < right) {
char ch = (char)(value[right - 1] & 0xff);
if (ch != ' ' && ch != '\t' && !Character.isWhitespace(ch)) {
break;
}
right--;
}
return right;
}
public static String strip(byte[] value) {
int left = indexOfNonWhitespace(value);
if (left == value.length) {
return "";
}
int right = lastIndexOfNonWhitespace(value);
return ((left > 0) || (right < value.length)) ? newString(value, left, right - left) : null;
}
public static String stripLeading(byte[] value) {
int left = indexOfNonWhitespace(value);
if (left == value.length) {
return "";
}
return (left != 0) ? newString(value, left, value.length - left) : null;
}
public static String stripTrailing(byte[] value) {
int right = lastIndexOfNonWhitespace(value);
if (right == 0) {
return "";
}
return (right != value.length) ? newString(value, 0, right) : null;
}
public static void putChar(byte[] val, int index, int c) {
//assert (canEncode(c));
val[index] = (byte)(c);