= code cleanup

- for loop replaceable with enhanced 'for' loop
  - using diamond in generic type
  - collapse try catch exception
  - using try-with-resource
  - using  List#sort instead of Collections#sort
  - replaced lambda with method reference
  - using native compare method to compare numbers
  - using switch instead of if for in ESSyncUtil

filter/src/main/java/com/alibaba/otter/canal/filter/aviater/AviaterRegexFilter.java

@@ -53,7 +53,7 @@ public class AviaterRegexFilter implements CanalEventFilter<String> {
         // 对pattern按照从长到短的排序
         // 因为 foo|foot 匹配 foot 会出错，原因是 foot 匹配了 foo 之后，会返回 foo，但是 foo 的长度和 foot
         // 的长度不一样
-        Collections.sort(list, COMPARATOR);
+        list.sort(COMPARATOR);
         // 对pattern进行头尾完全匹配
         list = completionPattern(list);
         this.pattern = StringUtils.join(list, PATTERN_SPLIT);
@@ -90,13 +90,7 @@ public class AviaterRegexFilter implements CanalEventFilter<String> {
 
         @Override
         public int compare(String str1, String str2) {
-            if (str1.length() > str2.length()) {
-                return -1;
-            } else if (str1.length() < str2.length()) {
-                return 1;
-            } else {
-                return 0;
-            }
+            return Integer.compare(str2.length(), str1.length());
         }
     }