RFR: 8071571: Move substring of same string to slow path (original) (raw)

Tue May 12 21:22:00 UTC 2015

public String substring(int beginIndex, int endIndex) {
    int subLen;
    return ((beginIndex | (value.length - endIndex)) > 0
            && (subLen = endIndex - beginIndex) > 0)
        ? new String(value, beginIndex, subLen)
        : substringSlowPath(beginIndex, endIndex);
}

private String substringSlowPath(int beginIndex, int endIndex) {
    if (beginIndex <= 0) {
        if (beginIndex < 0) {
            throw new StringIndexOutOfBoundsException(beginIndex);
        }
        if (endIndex == value.length) {
            return this;
        }
    }
    if (endIndex > value.length) {
        throw new StringIndexOutOfBoundsException(endIndex);
    }
    if (endIndex == beginIndex) {
        return "";
    }
    throw new StringIndexOutOfBoundsException(endIndex - beginIndex);
}