reta commented on a change in pull request #479: String.split via fastpath
instead of precompiled Pattern
URL: https://github.com/apache/cxf/pull/479#discussion_r239430809
##########
File path: core/src/main/java/org/apache/cxf/common/util/StringUtils.java
##########
@@ -26,37 +26,33 @@
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Arrays;
-import java.util.HashMap;
import java.util.List;
import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Predicate;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Stream;
public final class StringUtils {
- public static final Map<String, Pattern> PATTERN_MAP = new HashMap<>();
- static {
- String[] patterns = {"/", " ", ":", ",", ";", "=", "\\.", "\\+"};
- for (String p : patterns) {
- PATTERN_MAP.put(p, Pattern.compile(p));
- }
- }
+ private static final Map<String, Pattern> PATTERN_MAP = new
ConcurrentHashMap<>();
private static final Predicate<String> NOT_EMPTY = (String s) ->
!s.isEmpty();
private StringUtils() {
}
+ /* String.split via fastpath preferred */
public static String[] split(String s, String regex) {
return split(s, regex, 0);
}
+ @Deprecated
public static String[] split(String s, String regex, int limit) {
- Pattern p = PATTERN_MAP.getOrDefault(regex, Pattern.compile(regex));
+ Pattern p = PATTERN_MAP.computeIfAbsent(regex, key ->
Pattern.compile(key));
Review comment:
There is an well-known issue with JDK8 related to `computeIfAbsent`,
https://bugs.openjdk.java.net/browse/JDK-8161372, not sure if we should take
into account or not ...
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