[GitHub] [skywalking] kezhenxu94 commented on a change in pull request #4264: Refactor SnifferConfigInitializer and related componets with new features in JDK8+

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kezhenxu94 commented on a change in pull request #4264: Refactor SnifferConfigInitializer and related componets with new features in JDK8+
URL: https://github.com/apache/skywalking/pull/4264#discussion_r367982469
 
 

 ##########
 File path: apm-commons/apm-util/src/main/java/org/apache/skywalking/apm/util/StringUtil.java
 ##########
 @@ -27,6 +27,24 @@ public static boolean isNotEmpty(String str) {
         return !isEmpty(str);
     }
 
+    public static boolean isBlank(CharSequence str) {
+        if (str == null) {
+            return true;
+        }
+
+        for (int i = 0; i < str.length(); i++) {
+            if (!Character.isWhitespace(str.charAt(i))) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    public static boolean isNotBlank(CharSequence str) {
+        return !isBlank(str);
+    }
+
 
 Review comment:
   If we don't have to manipulate `CharSequence`, just reuse `org.apache.skywalking.apm.util.StringUtil#isNotEmpty`, only add codes when you really need it

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