JSF 2: Using enums in the rendered attribute

Question

Is there any way to check declaratively whether an enum has a specified value. For example:

Answer 1

I solved a similar problem by statically dumping all the enum keys (which are used in the rendered UI components) in a map and then I use a static getByKey method to convert the value from the UI into an actual native enum in the setter, throwing an Exception if the value provided is invalid:

public enum ReportType {

    FILING("F", "Filings"),
    RESOLUTION("R", "Resolutions"),
    BASIS("B", "Bases"),
    STAFF("T", "Staff Counts"),
    COUNTS("I", "Counts");

    private String key;
    private String label;

    private static Map keyMap = new HashMap();  

    static {
        for(ReportType type : ReportType.values()) {
            keyMap.put(type.getKey(), type);
        }
    }

    private ReportType(String _key, String _label) {
        this.key = _key;
        this.label = _label;

    }

    public String getKey() {
        return this.key;
    }

    public String getLabel() {
        return this.label;
    }

    public static List getValueList() {
        return Arrays.asList(ReportType.values());
    }

    public static ReportType getByKey(String _key) {
        ReportType result = keyMap.get(_key);

        if(result == null) {
            throw new IllegalArgumentException("Invalid report type key: " + _key);
        }

        return result;
    }
}

In the UI tier, the enum key is used as the value and the enum label is used as the label:

In the managed bean, I convert the enum into a renderable list, using the getValueList() from the enum:

public List getAllReportTypes() {
    return ReportType.getValueList();
}

Finally, the [g|s]etters in the managed bean look as follows:

public String getReportType() {
    return this.crtRptType.getKey();
}

public void setReportType(String _val) {
    this.crtRptType = ReportType.getByKey(_val);
}