Implementing a bitfield using java enums

Question

I maintain a large document archive and I often use bit fields to record the status of my documents during processing or when validating them. My legacy code simply uses sta

Answer 1

Instead of defining constructor parameters, you could simply use the internal ordinal() value to calculate this.

public enum StatusFlag {

    DOCUMENT_STATUS_NOT_DEFINED,
    DOCUMENT_STATUS_OK, 
    DOCUMENT_STATUS_MISSING_TID_DIR,
    DOCUMENT_STATUS_MISSING_TIF_FILE,
    DOCUMENT_STATUS_MISSING_PDF_FILE,
    DOCUMENT_STATUS_MISSING_OCR_FILE,
    DOCUMENT_STATUS_PAGE_COUNT_TIF,
    DOCUMENT_STATUS_PAGE_COUNT_PDF,
    DOCUMENT_STATUS_UNAVAILABLE;


    public long getStatusFlagValue(){
        return 1 << this.ordinal();
    } 

}

Please note that now you should abstain from reordering, inserting (other than at the end) or deleting entries, otherwise the flag values will change, and the meaning of your database contents will change.