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package org.apertereports.dao;

import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.criterion.Order;
import org.hibernate.criterion.Projections;
import org.hibernate.criterion.Restrictions;
import org.apertereports.dao.utils.WHS;
import org.apertereports.model.CyclicReportOrder;
import org.apertereports.model.CyclicReportOrder;
import org.apertereports.model.ReportOrder;
import org.apertereports.model.ReportTemplate;

import java.util.*;

/**
 * DAO methods for retrieving and saving cyclic report orders.
 * 
 * @see CyclicReportOrder
 */
public class CyclicReportOrderDAO {
	/**
	 * Returns all cyclic reports from database.
	 * 
	 * @return A collection of cyclic reports
	 */
	public static Collection fetchAllCyclicReportOrders() {
		return new org.apertereports.dao.utils.WHS>() {
			@Override
			public Collection lambda() {
				return sess.createCriteria(CyclicReportOrder.class).list();
			}
		}.p();
	}

	/**
	 * Returns a unique cyclic report representation from database by primary
	 * key.
	 * 
	 * @param reportId
	 *            Primary key value.
	 * @return A cyclic report corresponding to the given id
	 */
	public static CyclicReportOrder fetchCyclicReportOrder(final Long reportId) {
		return new org.apertereports.dao.utils.WHS() {
			@Override
			public CyclicReportOrder lambda() {
				CyclicReportOrder cro = (CyclicReportOrder) sess.createCriteria(CyclicReportOrder.class)
						.add(Restrictions.eq("id", reportId)).uniqueResult();
				return cro;
			}

		}.p();
	}

	/**
	 * Returns a unique cyclic report representation from database by processed
	 * report order id.
	 * 
	 * @param reportId
	 *            Processed report order id
	 * @return A cyclic report corresponding to the processed order
	 */
	public static CyclicReportOrder fetchForReportOrder(final Long reportId) {
		return new org.apertereports.dao.utils.WHS() {
			@Override
			public CyclicReportOrder lambda() {
				CyclicReportOrder cro = (CyclicReportOrder) sess.createCriteria(CyclicReportOrder.class)
						.createCriteria("processedOrder").add(Restrictions.eq("id", reportId)).uniqueResult();
				return cro;
			}

		}.p();
	}

	/**
	 * Removes all given cyclic report orders from database.
	 * 
	 * @param reports
	 *            An array of cyclic reports to remove
	 */
	public static void removeCyclicReportOrder(final CyclicReportOrder... reports) {
		new org.apertereports.dao.utils.WHS() {
			@Override
			public Boolean lambda() {
				for (CyclicReportOrder reportOrder : reports) {
					if (reportOrder != null) {
						sess.delete(reportOrder);
					}
				}
				return true;
			}
		}.p();
	}

	/**
	 * Saves an instance of cyclic report to database. Returns the persisted
	 * object's id.
	 * 
	 * @param cyclicReportOrder
	 *            A cyclic report to save.
	 * @return id The cyclic report id
	 */
	public static Long saveOrUpdateCyclicReportOrder(final CyclicReportOrder cyclicReportOrder) {
		return new org.apertereports.dao.utils.WHS() {
			@Override
			public Long lambda() {
				sess.saveOrUpdate(cyclicReportOrder);
				return cyclicReportOrder.getId();
			}
		}.p();
	}

	/**
	 * Returns all enabled cyclic report orders from database.
	 * 
	 * @return A collection of enabled cyclic report orders.
	 */
	public static Collection fetchAllEnabledCyclicReports() {
		return new org.apertereports.dao.utils.WHS>() {
			@Override
			public Collection lambda() {
				return sess.createCriteria(CyclicReportOrder.class).add(Restrictions.eq("enabled", true)).list();
			}
		}.p();
	}

	/**
	 * Returns a list of cyclic report orders relevant to given ids.
	 * 
	 * @param reportIds
	 *            An array of {@link org.apertereports.model.CyclicReportOrder}
	 *            primary key values.
	 * @return A list of cyclic report orders
	 */
	public static List fetchCyclicReportsByIds(final Long... reportIds) {
		return new org.apertereports.dao.utils.WHS>(false) {
			@Override
			public List lambda() {
				if (reportIds.length == 0) {
					return new ArrayList();
				}
				List list = sess.createCriteria(CyclicReportOrder.class)
						.add(Restrictions.in("id", reportIds)).list();
				if (list == null || list.size() == 0) {
					return new ArrayList();
				}
				return list;
			}
		}.p();
	}

	/**
	 * Updates only given instances of {@link CyclicReportOrder} and removes not
	 * listed from database. Returns a list of deleted (trimmed) cyclic reports.
	 * 
	 * @param reportOrders
	 *            Instances to update
	 * @return A collection of deleted cyclic reports
	 */
	public static Collection trimAndUpdate(final Collection reportOrders) {
		return new org.apertereports.dao.utils.WHS>(true) {
			@Override
			public Collection lambda() {
				Set ids = new HashSet();
				for (CyclicReportOrder cro : reportOrders) {
					ids.add(cro.getId());
					sess.saveOrUpdate(cro);
				}
				Criteria crit = sess.createCriteria(CyclicReportOrder.class);
				if (!ids.isEmpty()) {
					crit.add(Restrictions.not(Restrictions.in("id", ids)));
				}
				List list = crit.list();
				for (CyclicReportOrder cro : list) {
					sess.delete(cro);
				}
				return list;
			}
		}.p();
	}

	public static Integer countMatching(final String filter) {
		return new WHS() {
			@Override
			public Integer lambda() {
				return ((Long) createFilterCriteria(sess, filter).setProjection(Projections.rowCount())
						.uniqueResult()).intValue();
			}
		}.p();
	}

	public static Collection fetch(final String filter, final int firstResult, final int maxResults) {
		return new WHS>() {

			@Override
			public Collection lambda() {
				Criteria c = createFilterCriteria(sess, filter);
				c.setFirstResult(firstResult);
				c.setMaxResults(maxResults);
				c.addOrder(Order.asc("id"));
				return c.list();
			}
		}.p();
	}

	private static Criteria createFilterCriteria(Session session, String filter) {
		String extendedFilter = "%";
		if (filter != null && !filter.isEmpty()) {
			extendedFilter += filter + "%";
		}
		return session
				.createCriteria(CyclicReportOrder.class)
				.createAlias("report", "r")
				.add(Restrictions.or(Restrictions.ilike("description", extendedFilter),
						Restrictions.ilike("r.reportname", extendedFilter)));
	}

}