java - How can I store enums with fixed values in play -

i'm trying convert grails-project playframework. in grails can define id the id stored in database (see enhanced enum support in release notes). saw similar question, no acceptable solution. if change type crud-module problem, because information enum should shown lost.

so wonder if there exists nice solution play, based on hibernate. perhaps hacking jpaplugin?

[update 1] started try second solution @type-annotation. unfortunately become broken hibernate 3.6 (which used play 1.2.2). typefactory.basic() not available more. following documentation can't find work around.

[update 2] there solution hibernate 3.6.1, it's clumsy define type @ each usage of enum.

@type(type="hibernatehelper.genericenumusertype",              parameters= {             @parameter(                     name  = "enumclass",                                           value = "models.geschlecht"),         }) public geschlecht geschlecht = geschlecht.weiblich;  

not sure if it's work, 1 possible solution following:

1. wrote generic type mapper:

   package hibernatehelper;  import java.io.serializable; import java.lang.reflect.method; import java.sql.preparedstatement; import java.sql.resultset; import java.sql.sqlexception; import java.util.properties; import org.hibernate.hibernateexception; import org.hibernate.type.abstractsinglecolumnstandardbasictype; import org.hibernate.type.typeresolver; import org.hibernate.usertype.parameterizedtype; import org.hibernate.usertype.usertype;   public class genericenumusertype implements usertype, parameterizedtype {      private class <? extends enum> enumclass;      private class <?> identifiertype;      private method identifiermethod;      private method valueofmethod;      private static final string defaultidentifiermethodname = "getid";      private static final string defaultvalueofmethodname = "parseid";      private abstractsinglecolumnstandardbasictype type;      private int[] sqltypes;      @override     public void setparametervalues(properties parameters) {         string enumclassname = parameters.getproperty("enumclass");         try {             enumclass = class.forname(enumclassname).assubclass(enum.class);         } catch (classnotfoundexception exception) {             throw new hibernateexception("enum class not found", exception);         }          string identifiermethodname =                 parameters.getproperty("identifiermethod",                         defaultidentifiermethodname);          try {             identifiermethod =                     enumclass.getmethod(identifiermethodname, new class[0]);             identifiertype = identifiermethod.getreturntype();         } catch (exception exception) {             throw new hibernateexception("failed optain identifier method",                     exception);         }          typeresolver tr = new typeresolver();         type =                 (abstractsinglecolumnstandardbasictype) tr.basic(identifiertype                         .getname());         if (type == null) {             throw new hibernateexception("unsupported identifier type "                     + identifiertype.getname());         }         sqltypes = new int[] {type.sqltype()};          string valueofmethodname = parameters.getproperty("valueofmethod",                 defaultvalueofmethodname);         try {             valueofmethod = enumclass.getmethod(valueofmethodname,                             new class[] {identifiertype});         } catch (exception exception) {             throw new hibernateexception("failed optain valueof method",                     exception);         }     }      @override     public class returnedclass() {         return enumclass;     }      @override     public object nullsafeget(resultset rs, string[] names, object owner)             throws hibernateexception, sqlexception {         object identifier = type.get(rs, names[0]);         if (identifier == null) {             return null;         }          if (valueofmethod == null) {          }          try {             return valueofmethod.invoke(enumclass, new object[] {identifier});         } catch (exception exception) {             throw new hibernateexception(                     "exception while invoking valueofmethod of enumeration class: ",                     exception);         }     }      public void nullsafeset(preparedstatement st, object value, int index)             throws hibernateexception, sqlexception {         try {             object identifier =                     value != null ? identifiermethod.invoke(value,                             new object[0]) : null;             st.setobject(index, identifier);         } catch (exception exception) {             throw new hibernateexception(                     "exception while invoking identifiermethod of enumeration class: ",                     exception);          }     }      @override     public int[] sqltypes() {         return sqltypes;     }      @override     public object assemble(serializable cached, object owner)             throws hibernateexception {         return cached;     }      @override     public object deepcopy(object value) throws hibernateexception {         return value;     }      @override     public serializable disassemble(object value) throws hibernateexception {         return (serializable) value;     }      @override     public boolean equals(object x, object y) throws hibernateexception {         return x == y;     }      @override     public int hashcode(object x) throws hibernateexception {         return x.hashcode();     }      public boolean ismutable() {         return false;     }      public object replace(object original, object target, object owner)             throws hibernateexception {         return original;     } } 

2. wrote enhancer every attribute type enum , if type has static-method parseid. add following annotation javaassist:

   @type(type="hibernatehelper.genericenumusertype",      parameters= {     @parameter(             name  = "enumclass",                                   value = "<fullqualified classname of enum class>"), }) 

but i'm unsure if not magic such problem. perhaps can give me advice.