Enumシリアライザ

jabsorbはデフォルトではEnumをシリアライズ/デシリアライズできないみたいなので、ドキュメントの「7.2. Implementing a Serializer」と添付のシリアライザクラスのソースを参考にカスタムシリアライザを作成。以下の実装でよいはず。

import org.jabsorb.serializer.AbstractSerializer;
import org.jabsorb.serializer.MarshallException;
import org.jabsorb.serializer.ObjectMatch;
import org.jabsorb.serializer.SerializerState;
import org.jabsorb.serializer.UnmarshallException;
import org.json.JSONException;
import org.json.JSONObject;

/**
 * Enumのシリアライザ
 */
public class EnumSerializer extends AbstractSerializer {

    /**UID*/
    private static final long serialVersionUID = -7925358912890518075L;

    @Override @SuppressWarnings("unchecked")
    public boolean canSerialize(Class clazz, Class jsonClazz) {
        return Enum.class.isAssignableFrom(clazz) && (jsonClazz == null || jsonClazz == JSONObject.class);
    }
    
    @Override @SuppressWarnings("unchecked") 
    public Class[] getJSONClasses() {
        return new Class[] {};
    }

    @Override @SuppressWarnings("unchecked") 
    public Class[] getSerializableClasses() {
        return new Class[] {};
    }

    @Override public Object marshall(SerializerState state, Object p, Object o)
    throws MarshallException {
        JSONObject obj = new JSONObject();
        if (o instanceof Enum) {
            String name = ((Enum<?>) o).name();
            try {
                obj.put("javaClass", o.getClass().getName());
                obj.put("name", name);
              } catch (JSONException e) {
                throw new MarshallException(e.getMessage(), e);
              }
        } else {
            throw new MarshallException("cannot marshall enum using class " + o.getClass());
        }
        return obj;
    }

    @Override @SuppressWarnings("unchecked")
    public ObjectMatch tryUnmarshall( SerializerState state, Class clazz, Object o)
    throws UnmarshallException {
        JSONObject jso = (JSONObject) o;
        try {
            Class<?> cl = Class.forName(jso.getString("javaClass"));
            if ( !Enum.class.isAssignableFrom(cl) ) {
                throw new UnmarshallException("not enum");
            }
            state.setSerialized(o, ObjectMatch.OKAY);
            return ObjectMatch.OKAY;   
        } catch (Exception e) {
            throw new UnmarshallException("not enum", e);
        }
    }

    @Override  @SuppressWarnings("unchecked")
    public Object unmarshall(SerializerState state, Class clazz, Object o)
    throws UnmarshallException {
        JSONObject jso = (JSONObject) o;
        try {
            Class<?> cl = Class.forName(jso.getString("javaClass"));
            if ( !Enum.class.isAssignableFrom(cl) ) {
                throw new UnmarshallException("not enum");
            }
            String name = jso.getString("name");
            Object returnValue = Enum.valueOf( (Class) cl, name);;
            state.setSerialized(o, returnValue);
            return returnValue;
        } catch (Exception e) {
            throw new UnmarshallException("not enum", e);
        }
    }
}

有効化するには、JSONRPCBridgeにインスタンスを設定してやればOKです。

JSONRPCBridge bridge = JSONRPCBridge.getGlobalBridge();
bridge.registerSerializer( new EnumSerializer() );