/*
* Copyright (c) 2010 Lockheed Martin Corporation
*
* 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.eurekastreams.server.action.execution.start;
import java.io.Serializable;
import javax.persistence.NoResultException;
import org.eurekastreams.commons.actions.ExecutionStrategy;
import org.eurekastreams.commons.actions.context.ActionContext;
import org.eurekastreams.server.action.request.start.GadgetUserPrefActionRequest;
import org.eurekastreams.server.domain.GadgetUserPrefDTO;
import org.eurekastreams.server.persistence.mappers.opensocial.GetGadgetUserPrefMapper;
import org.eurekastreams.server.persistence.mappers.requests.opensocial.GadgetUserPrefRequest;
/**
* This execution strategy to retrieve Gadget User Preferences by Gadget id.
*/
public class GetGadgetUserPrefByIdExecutionStrategy implements ExecutionStrategy<ActionContext>
{
/**
* Local instance of User Pref mapper.
*/
private GetGadgetUserPrefMapper mapper;
/**
* Default value returned to caller if no preferences are found.
*/
private static final String DEFAULT_USER_PREFS = "{}";
/**
* Constructor for User Pref Action.
*
* @param inMapper
* - gadget user pref mapper instance.
*/
public GetGadgetUserPrefByIdExecutionStrategy(final GetGadgetUserPrefMapper inMapper)
{
mapper = inMapper;
}
/**
* Perform the action execution for retrieving user preferences by id.
*
* @param inActionContext
* - the action execution context, including the GadgetUserPrefActionRequest
*
* @return Serializable GadgetUserPref DTO object.
*/
@Override
public Serializable execute(final ActionContext inActionContext)
{
GadgetUserPrefActionRequest request = (GadgetUserPrefActionRequest) inActionContext.getParams();
String userPrefs;
try
{
GadgetUserPrefDTO currentPrefs = mapper.execute(new GadgetUserPrefRequest(request.getGadgetId(), request
.getGadgetUserPref()));
userPrefs = currentPrefs.getJsonUserPref();
}
catch (NoResultException nex)
{
userPrefs = DEFAULT_USER_PREFS;
}
return userPrefs;
}
}