Details
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New Feature
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Resolution: Unresolved
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Normal
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None
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7.0.3
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None
Description
Use case: a parameter is passed in query string, e.g. /app/test.zul?type=enumValue
Then I want to access that parameter value in my ViewModel like this:
public enum TypeEnum { enumValue, enumValue2; } // ViewModel method @Init public void init(@QueryParam("type") TypeEnum type) { // ... }
Currently it fails with Exception:
... Caused by: java.lang.ClassCastException: class java.lang.String cannot be converted to class foo.model.TypeEnum. at org.zkoss.lang.Classes.coerce(Classes.java:1443) at org.zkoss.bind.impl.ParamCall$5.resolveParameter(ParamCall.java:262) at org.zkoss.bind.impl.ParamCall$5.resolveParameter(ParamCall.java:258) at org.zkoss.bind.impl.ParamCall.resolveParameter(ParamCall.java:149) at org.zkoss.bind.impl.ParamCall.call(ParamCall.java:118) at org.zkoss.bind.impl.AbstractAnnotatedMethodInvoker.invokeMethod(AbstractAnnotatedMethodInvoker.java:90) ... 177 more Caused by: java.lang.NoSuchMethodException: foo.model.TypeEnum: no constructor for [enumValue] at org.zkoss.lang.Classes.newInstance(Classes.java:99) at org.zkoss.lang.Classes.coerce(Classes.java:1441) ... 182 more
It would be nice if Classes.coerce would convert between String and Enum automatically by calling Enum#name() / Enum#valueOf().
Note: Conversion by means of Enum#valueOf could handle IllegalArgumentException by returning null (not sure which way is better)