// Copyright 2012 Citrix Systems, Inc. Licensed under the
// Apache License, Version 2.0 (the "License"); you may not use this
// file except in compliance with the License.  Citrix Systems, Inc.
// reserves all rights not expressly granted by 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.
// 
// Automatically generated by addcopyright.py at 04/03/2012
package com.cloud.storage.dao;

import java.util.Date;
import java.util.List;

import javax.ejb.Local;

import com.cloud.storage.Snapshot;
import com.cloud.storage.SnapshotScheduleVO;
import com.cloud.utils.db.GenericDaoBase;
import com.cloud.utils.db.SearchBuilder;
import com.cloud.utils.db.SearchCriteria;


@Local (value={SnapshotScheduleDao.class})
public class SnapshotScheduleDaoImpl extends GenericDaoBase<SnapshotScheduleVO, Long> implements SnapshotScheduleDao {
	protected final SearchBuilder<SnapshotScheduleVO> executableSchedulesSearch;
	protected final SearchBuilder<SnapshotScheduleVO> coincidingSchedulesSearch;
    private final SearchBuilder<SnapshotScheduleVO> VolumeIdSearch;
    private final SearchBuilder<SnapshotScheduleVO> VolumeIdPolicyIdSearch;
	
	
	protected SnapshotScheduleDaoImpl() {
		
	    executableSchedulesSearch = createSearchBuilder();
        executableSchedulesSearch.and("scheduledTimestamp", executableSchedulesSearch.entity().getScheduledTimestamp(), SearchCriteria.Op.LT);
        executableSchedulesSearch.and("asyncJobId", executableSchedulesSearch.entity().getAsyncJobId(), SearchCriteria.Op.NULL);
        executableSchedulesSearch.done();
        
        coincidingSchedulesSearch = createSearchBuilder();
        coincidingSchedulesSearch.and("volumeId", coincidingSchedulesSearch.entity().getVolumeId(), SearchCriteria.Op.EQ);
        coincidingSchedulesSearch.and("scheduledTimestamp", coincidingSchedulesSearch.entity().getScheduledTimestamp(), SearchCriteria.Op.LT);
        coincidingSchedulesSearch.and("asyncJobId", coincidingSchedulesSearch.entity().getAsyncJobId(), SearchCriteria.Op.NULL);
        coincidingSchedulesSearch.done();
        
        VolumeIdSearch = createSearchBuilder();
        VolumeIdSearch.and("volumeId", VolumeIdSearch.entity().getVolumeId(), SearchCriteria.Op.EQ);
        VolumeIdSearch.done();
        
        VolumeIdPolicyIdSearch = createSearchBuilder();
        VolumeIdPolicyIdSearch.and("volumeId", VolumeIdPolicyIdSearch.entity().getVolumeId(), SearchCriteria.Op.EQ);
        VolumeIdPolicyIdSearch.and("policyId", VolumeIdPolicyIdSearch.entity().getPolicyId(), SearchCriteria.Op.EQ);
        VolumeIdPolicyIdSearch.done();
		
	}
	
	/**
	 * {@inheritDoc} 
	 */
	@Override
	public List<SnapshotScheduleVO> getCoincidingSnapshotSchedules(long volumeId, Date date) {
		SearchCriteria<SnapshotScheduleVO> sc = coincidingSchedulesSearch.create();
	    sc.setParameters("volumeId", volumeId);
	    sc.setParameters("scheduledTimestamp", date);
	    // Don't return manual snapshots. They will be executed through another code path.
        sc.addAnd("policyId", SearchCriteria.Op.NEQ, 1L);
        return listBy(sc);
	}

	
    @Override
    public SnapshotScheduleVO findOneByVolume(long volumeId) {
        SearchCriteria<SnapshotScheduleVO> sc = VolumeIdSearch.create();
        sc.setParameters("volumeId", volumeId);
        return findOneBy(sc);
    }
    
    
    @Override
    public SnapshotScheduleVO findOneByVolumePolicy(long volumeId, long policyId) {
        SearchCriteria<SnapshotScheduleVO> sc = VolumeIdPolicyIdSearch.create();
        sc.setParameters("volumeId", volumeId);
        sc.setParameters("policyId", policyId);
        return findOneBy(sc);
    }
	/**
     * {@inheritDoc} 
     */
    @Override
    public List<SnapshotScheduleVO> getSchedulesToExecute(Date currentTimestamp) {
        SearchCriteria<SnapshotScheduleVO> sc = executableSchedulesSearch.create();
        sc.setParameters("scheduledTimestamp", currentTimestamp);
        return listBy(sc);
    }
    
    /**
     * {@inheritDoc} 
     */
    @Override
    public SnapshotScheduleVO getCurrentSchedule(Long volumeId, Long policyId, boolean executing) {
        assert volumeId != null;
        SearchCriteria<SnapshotScheduleVO> sc = createSearchCriteria();
        SearchCriteria.Op op = executing ? SearchCriteria.Op.NNULL : SearchCriteria.Op.NULL;
        sc.addAnd("volumeId", SearchCriteria.Op.EQ, volumeId);
        if (policyId != null) {
            sc.addAnd("policyId", SearchCriteria.Op.EQ, policyId);
            if (policyId != Snapshot.MANUAL_POLICY_ID) {
                // manual policies aren't scheduled by the snapshot poller, so don't look for the jobId here
                sc.addAnd("asyncJobId", op);
            }
        } else {
            sc.addAnd("asyncJobId", op);
        }

        List<SnapshotScheduleVO> snapshotSchedules = listBy(sc);
        // This will return only one schedule because of a DB uniqueness constraint.
        assert (snapshotSchedules.size() <= 1);
        if (snapshotSchedules.isEmpty()) {
            return null;
        }
        else {
            return snapshotSchedules.get(0);
        }
    }
    
}