using enum in switch/case

java

Solution

You could provide a static method in your enum:

public static DownloadStatus getStatusFromInt(int status) {
    //here return the appropriate enum constant
}

Then in your main code:

int downloadStatus = ...;
DowloadStatus status = DowloadStatus.getStatusFromInt(downloadStatus);
switch (status) {
    case DowloadStatus.NOT_DOWNLOADED:
       //etc.
}

The advantage of this vs. the ordinal approach, is that it will still work if your enum changes to something like:

public enum DownloadStatus {
    NOT_DOWNLOADED(1),
    DOWNLOAD_IN_PROGRESS(2),
    DOWNLOADED(4);           /// Ooops, database changed, it is not 3 any more
}

Note that the initial implementation of the `getStatusFromInt` might use the ordinal property, but that implementation detail is now enclosed in the enum class.

Problem

I have an entity that has an enum property: ``` // MyFile.java public class MyFile { private DownloadStatus downloadStatus; // other properties, setters and getters } // DownloadStatus.java public enum DownloadStatus { NOT_DOWNLOADED(1), DOWNLOAD_IN_PROGRESS(2), DOWNLOADED(3); private int value; private DownloadStatus(int value) { this.value = value; } public int getValue() { return value; } } ``` I want to save this entity in database and retrieve it. The problem is that I save the int value in database and I get int value! I can not use switch like below: ``` MyFile file = new MyFile(); int downloadStatus = ... switch(downloadStatus) { case NOT_DOWNLOADED: file.setDownloadStatus(NOT_DOWNLOADED); break; // ... } ``` What should I do?

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