1

I am using an Enum field in Datastore entity class.

public enum MyEnum{
  A(0x9001L),
  B(0x9002L),
  C(0x9003L),
  D(0x9004L),
  private long value;
  private MyEnum(long value) {
    this.value = value;
  }
};

ENTITY

@PersistenceCapable
public class Log implements Serializable, Comparable<Object>, Cacheable {

    @PrimaryKey
    @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
    private Long id;

    @Persistent
    private MyEnum myEnumVariable;  
}

When I make a query by filtering only one Enum type 

declareParams.append(",Long myEnumVariable");
filterQuery.append(" this.myEnumVariable == myEnumVariable");

.. then the code works fine.

But when I make a query to filter multiple Enums 

declareParams.append(",List myEnumList");
filterQuery.append(" myEnumList.contains(this.myEnumVariable )");

I get an error saying -

java.lang.IllegalArgumentException: MyEnum : com.xxx.xxx.MyEnum is not a supported property type. at com.google.appengine.api.datastore.DataTypeUtils.checkSupportedSingleValue(DataTypeUtils.java:184) at com.google.appengine.api.datastore.DataTypeUtils.checkSupportedValue(DataTypeUtils.java:149) at com.google.appengine.api.datastore.Query$FilterPredicate.(Query.java:619) at com.google.appengine.api.datastore.Query.addFilter(Query.java:261) at org.datanucleus.store.appengine.query.DatastoreQuery.addLeftPrimaryExpression(DatastoreQuery.java:1343) at org.datanucleus.store.appengine.query.DatastoreQuery.addExpression(DatastoreQuery.java:1070) at org.datanucleus.store.appengine.query.DatastoreQuery.addExpression(DatastoreQuery.java:1054) at org.datanucleus.store.appengine.query.DatastoreQuery.addExpression(DatastoreQuery.java:1053) at org.datanucleus.store.appengine.query.DatastoreQuery.addFilters(DatastoreQuery.java:1031) at org.datanucleus.store.appengine.query.DatastoreQuery.performExecute(DatastoreQuery.java:238) at org.datanucleus.store.appengine.query.JDOQLQuery.performExecute(JDOQLQuery.java:92) at org.datanucleus.store.query.Query.executeQuery(Query.java:1489) at org.datanucleus.store.query.Query.executeWithMap(Query.java:1398) at org.datanucleus.jdo.JDOQuery.executeWithMap(JDOQuery.java:334)

NOTE: the object 'myEnumList' is a collection of 'MyEnum' type elements. When I use a list of 'Long' type elements, I don't see the error, but empty results are returned

user1226511
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1 Answers1

0

Currently you can solve it by quoting, like 

filterQuery.append(" this.myEnumVariable == 'myEnumVariable'");

It's working for me that way.

Harald
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