package com.opentravelsoft.service.impl;

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

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.opentravelsoft.providers.GenericDao;
import com.opentravelsoft.service.GenericManager;

/**
 * This class serves as the Base class for all other Managers - namely to hold
 * common CRUD methods that they might all use. You should only need to extend
 * this class when your require custom CRUD logic.
 *
 * <p>To register this class in your Spring context file, use the following XML.
 * <pre>
 *     <bean id="userManager" class="com.opentravelsoft.service.impl.GenericManagerImpl">
 *         <constructor-arg>
 *             <bean class="com.opentravelsoft.dao.hibernate.GenericDaoHibernate">
 *                 <constructor-arg value="com.opentravelsoft.entity.User"/>
 *                 <property name="sessionFactory" ref="sessionFactory"/>
 *             </bean>
 *         </constructor-arg>
 *     </bean>
 * </pre>
 *
 *
 * @param <T> a type variable
 * @param <PK> the primary key for that type
 */
public class GenericManagerImpl<T, PK extends Serializable> implements GenericManager<T, PK> {
    /**
     * Log variable for all child classes. Uses LogFactory.getLog(getClass()) from Commons Logging
     */
    protected final Log log = LogFactory.getLog(getClass());

    /**
     * GenericDao instance, set by constructor of child classes
     */
    protected GenericDao<T, PK> dao;

    public GenericManagerImpl() {}

    public GenericManagerImpl(GenericDao<T, PK> genericDao) {
        this.dao = genericDao;
    }

    /**
     * {@inheritDoc}
     */
    public List<T> getAll() {
        return dao.getAll();
    }

    /**
     * {@inheritDoc}
     */
    public T get(PK id) {
        return dao.get(id);
    }

    /**
     * {@inheritDoc}
     */
    public boolean exists(PK id) {
        return dao.exists(id);
    }

    /**
     * {@inheritDoc}
     */
    public T save(T object) {
        return dao.save(object);
    }

    /**
     * {@inheritDoc}
     */
    public void remove(PK id) {
        dao.remove(id);
    }
}