leventov commented on a change in pull request #6607: Prohibit String.replace()
and String.replaceAll(), fix and prohibit some toString()-related redundancies
URL: https://github.com/apache/incubator-druid/pull/6607#discussion_r233960721
##########
File path:
core/src/main/java/org/apache/druid/java/util/common/StringUtils.java
##########
@@ -173,16 +163,81 @@ public static String urlEncode(String s)
}
}
- private static String removeChar(String s, char c, int firstOccurranceIndex)
+ /**
+ * Removes all occurrences of the given char from the given string. This
method is an optimal version of
+ * {@link String#replace(CharSequence, CharSequence) s.replace("c", "")}.
+ */
+ public static String removeChar(String s, char c)
{
+ int pos = s.indexOf(c);
+ if (pos < 0) {
+ return s;
+ }
StringBuilder sb = new StringBuilder(s.length() - 1);
- sb.append(s, 0, firstOccurranceIndex);
- for (int i = firstOccurranceIndex + 1; i < s.length(); i++) {
- char charOfString = s.charAt(i);
- if (charOfString != c) {
- sb.append(charOfString);
- }
+ int prevPos = 0;
+ do {
+ sb.append(s, prevPos, pos);
+ prevPos = pos + 1;
+ pos = s.indexOf(c, pos + 1);
+ } while (pos > 0);
+ sb.append(s, prevPos, s.length());
+ return sb.toString();
+ }
+
+ /**
+ * Replaces all occurrences of the given char in the given string with the
given replacement string. This method is an
+ * optimal version of {@link String#replace(CharSequence, CharSequence)
s.replace("c", replacement)}.
+ */
+ public static String replaceChar(String s, char c, String replacement)
+ {
+ int pos = s.indexOf(c);
+ if (pos < 0) {
+ return s;
+ }
+ StringBuilder sb = new StringBuilder(s.length() - 1 +
replacement.length());
+ int prevPos = 0;
+ do {
+ sb.append(s, prevPos, pos);
+ sb.append(replacement);
+ prevPos = pos + 1;
+ pos = s.indexOf(c, pos + 1);
+ } while (pos > 0);
+ sb.append(s, prevPos, s.length());
+ return sb.toString();
+ }
+
+ /**
+ * Replaces all occurrences of the given target substring in the given
string with the given replacement string. This
+ * method is an optimal version of {@link String#replace(CharSequence,
CharSequence) s.replace(target, replacement)}.
+ */
+ public static String replace(String s, String target, String replacement)
Review comment:
There are uses for it yet. BTW even the new OpenJDK 9+ version converts the
`target` to String internally because the implementation relies on `indexOf()`
that is optimized only for two Strings, i. e. making the `target` a
`CharSequence` will only give false sense of "optimality". The replacement
could be made `CharSequence` but there is no need for that yet.
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