/*
* Copyright (C) 2009 JavaRosa
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package org.openrosa.client.jr.core.model.data;
import org.openrosa.client.jr.core.util.externalizable.Externalizable;
/**
* An IAnswerData object represents an answer to a question
* posed to a user.
*
* IAnswerData objects should never in any circumstances contain
* a null data value. In cases of empty or non-existent responses,
* the IAnswerData reference should itself be null.
*
* @author Drew Roos
*
*/
public interface IAnswerData extends Externalizable {
/**
* @param o the value of this answerdata object. Cannot be null.
* Null Data will not overwrite existing values.
* @throws NullPointerException if o is null
*/
void setValue (Object o); //can't be null
/**
* @return The value of this answer, will never
* be null
*/
Object getValue (); //will never be null
/**
* @return Gets a string representation of this
* answer
*/
String getDisplayText ();
IAnswerData clone ();
}