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Java Object Document Mapper for MongoDB

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package org.mongodb.morphia.converters;

import com.mongodb.DBRef;
import org.mongodb.morphia.Key;
import org.mongodb.morphia.mapping.MappedField;

/**
 * @author Uwe Schaefer, ([email protected])
 * @author scotthernandez
 */
public class KeyConverter extends TypeConverter {

    /**
     * Creates the Converter.
     */
    public KeyConverter() {
        super(Key.class);
    }

    @Override
    public Object decode(final Class targetClass, final Object o, final MappedField optionalExtraInfo) {
        if (o == null) {
            return null;
        }
        if (!(o instanceof DBRef)) {
            throw new ConverterException(String.format("cannot convert %s to Key because it isn't a DBRef", o.toString()));
        }


        DBRef ref = (DBRef) o;

        MappedField actualType = getActualType(optionalExtraInfo);


        final Class keyType = actualType != null
                                 ? actualType.getConcreteType()
                                 : getMapper().getClassFromCollection(ref.getCollectionName());

        final Key key = new Key