[jira] [Created] (FLINK-14871) Better formatter of toString method for StateTransition

[Shang Yuanchun (Jira)]

chaiyongqiang created FLINK-14871:
-------------------------------------

             Summary: Better formatter of toString method for StateTransition
                 Key: FLINK-14871
                 URL: https://issues.apache.org/jira/browse/FLINK-14871
             Project: Flink
          Issue Type: Improvement
          Components: Library / CEP
    Affects Versions: 1.9.1
            Reporter: chaiyongqiang
         Attachments: 屏幕快照 2019-11-20 下午3.27.43.png

The toString method in StateTransition does not have a good format. 
{code:java}
@Override
        public String toString() {
                return new StringBuilder()
                                .append("StateTransition(")
                                .append(action).append(", ")
                                .append("from ").append(sourceState.getName())
                                .append("to ").append(targetState.getName())
                                .append(condition != null ? ", with condition)" : ")")
                                .toString();
        }
{code}
The problem is there's no separator between `sourceState.getName()` and "to " which leads to a bad format like the attachment showing.

A blank space is more friendly.
{code:java}
@Override
        public String toString() {
                return new StringBuilder()
                                .append("StateTransition(")
                                .append(action).append(", ")
                                .append("from ").append(sourceState.getName())
                                .append(" to ").append(targetState.getName())
                                .append(condition != null ? ", with condition)" : ")")
                                .toString();
        }
{code}



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