yuchengxin commented on code in PR #22767:
URL: https://github.com/apache/flink/pull/22767#discussion_r1241088372
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flink-table/flink-table-common/src/main/java/org/apache/flink/table/watermark/WatermarkEmitStrategy.java:
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@@ -0,0 +1,50 @@
+package org.apache.flink.table.watermark;
+
+import org.apache.flink.annotation.PublicEvolving;
+
+import java.util.Arrays;
+
+/** The strategy for emitting watermark. */
+@PublicEvolving
+public enum WatermarkEmitStrategy {
+ ON_EVENT("on-event"),
+ ON_PERIODIC("on-periodic"),
+ ;
+
+ private final String alias;
+
+ public String getAlias() {
+ return alias;
+ }
+
+ WatermarkEmitStrategy(String alias) {
+ this.alias = alias;
+ }
+
+ public boolean isOnEvent() {
+ return this == ON_EVENT;
+ }
+
+ public boolean isOnPeriodic() {
+ return this == ON_PERIODIC;
+ }
+
+ @Override
+ public String toString() {
+ return this.alias;
+ }
+
+ public static WatermarkEmitStrategy lookup(String alias) {
Review Comment:
This method is like the `get` method of the pojo class
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