com.headstrong.teevra.services.statemachine.dao.impl.StateMachineDAOImpl.java Source code

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Here is the source code for com.headstrong.teevra.services.statemachine.dao.impl.StateMachineDAOImpl.java

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/*
 * The information in this document is subject to change without notice and 
 * does not represent a commitment by Headstrong Corporation. The software 
 * and/or databases described in this document are furnished under a license 
 * agreement and may be used or copied only in accordance with the terms of 
 * the agreement. 
 * 
 * Copyright  2008 Headstrong Corporation
 * All rights reserved.
 * 
 * $Id: StateMachineDAOImpl.java
 * $Revision: 
 * $Author: viswanathp
 * $DateTime: Mar 4, 2009 
 */

package com.headstrong.teevra.services.statemachine.dao.impl;

import java.util.List;

import org.hibernate.criterion.DetachedCriteria;
import org.hibernate.criterion.Restrictions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.headstrong.teevra.common.dao.hibernate.BaseHibernateDAO;
import com.headstrong.teevra.services.statemachine.dao.StateMachineDAO;
import com.headstrong.teevra.services.statemachine.eo.StateMachineEO;
import com.headstrong.teevra.services.statemachine.exception.StateMachineServiceException;
import com.headstrong.teevra.services.statemachine.exception.UniqueStateMachineException;

/**
 * StateMachineDAOImpl implements StateMachineDAO and contains methods to
 * perform CRUD operations on state machines.
 */
public class StateMachineDAOImpl extends BaseHibernateDAO<StateMachineEO> implements StateMachineDAO {

    /**
     * Logger for StateMachineDAOImpl
     */
    private static Logger logger = LoggerFactory.getLogger(StateMachineDAOImpl.class);

    /*
     * (non-Javadoc)
     * 
     * @see com.headstrong.teevra.services.statemachine.dao.StateMachineDAO#deleteStateMachine(java.lang.String)
     */
    public void deleteStateMachine(String stateMachineName) throws StateMachineServiceException {
        super.delete(getStateMachine(stateMachineName));

    }

    /*
     * (non-Javadoc)
     * 
     * @see com.headstrong.teevra.services.statemachine.dao.StateMachineDAO#getStateMachineList()
     */
    public List<StateMachineEO> getStateMachineList() throws StateMachineServiceException {
        String query = "from StateMachineEO stateMachine";
        return super.getByQuery(query);
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.headstrong.teevra.services.statemachine.dao.StateMachineDAO#saveStateMachine(com.headstrong.teevra.services.statemachine.eo.StateMachineEO)
     */
    public void saveStateMachine(StateMachineEO stateMachineToSave) throws StateMachineServiceException {
        DetachedCriteria criteria = DetachedCriteria.forClass(StateMachineEO.class);
        criteria.add(Restrictions.eq("stateMachineName", stateMachineToSave.getStateMachineName()));
        if (stateMachineToSave.getStateMachineId() != null) {
            criteria.add(Restrictions.ne("stateMachineId", stateMachineToSave.getStateMachineId()));
        }
        List<StateMachineEO> stateMachineList = super.getByCriteria(criteria);

        if (!stateMachineList.isEmpty()) {
            logger.error("A state machine with the same name already exists in the system");
            throw new UniqueStateMachineException("A state machine with the name " + "'"
                    + stateMachineToSave.getStateMachineName() + "'" + " already exists in the system");
        } else {
            super.saveOrUpdate(stateMachineToSave);
        }

    }

    private StateMachineEO getStateMachine(String stateMachineName) {
        return super.getByCriteria(DetachedCriteria.forClass(StateMachineEO.class)
                .add(Restrictions.eq("stateMachineName", stateMachineName))).get(0);
    }

}