/*
 * 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.stream;

import java.io.Serializable;
import java.util.List;

import org.eurekastreams.commons.actions.ExecutionStrategy;
import org.eurekastreams.commons.actions.context.PrincipalActionContext;
import org.eurekastreams.commons.exceptions.ExecutionException;
import org.eurekastreams.server.domain.stream.StreamFilter;
import org.eurekastreams.server.persistence.mappers.DomainMapper;
import org.eurekastreams.server.service.actions.response.GetCurrentUserStreamFiltersResponse;

/**
 * Get the streams for the current user.
 */
public class GetCurrentUsersStreamsExecution implements ExecutionStrategy<PrincipalActionContext>
{
    /**
     * Streams mapper.
     */
    private DomainMapper<Long, List<StreamFilter>> getUserStreamsMapper;

    /**
     * Constructor.
     * 
     * @param inGetUserStreamsMapper
     *            stream mapper.
     */
    public GetCurrentUsersStreamsExecution(final DomainMapper<Long, List<StreamFilter>> inGetUserStreamsMapper)
    {
        getUserStreamsMapper = inGetUserStreamsMapper;
    }

    /**
     * Execute the action.
     * 
     * @param inActionContext
     *            the action context.
     * @return the list of stream filters for the current user.
     * @exception ExecutionException
     *                not expected.
     */
    public Serializable execute(final PrincipalActionContext inActionContext) throws ExecutionException
    {
        final List<StreamFilter> streams = getUserStreamsMapper.execute(inActionContext.getPrincipal().getId());
        return new GetCurrentUserStreamFiltersResponse(streams.size(), streams);
    }
}