EDIT

// $Id$

/**

 * Copyright (C) 2007 EDIT

 * European Distributed Institute of Taxonomy 

 * http://www.e-taxonomy.eu

 * 

 * The contents of this file are subject to the Mozilla Public License Version 1.1

 * See LICENSE.TXT at the top of this package for the full license terms.

 */

package eu.etaxonomy.cdm.api.service;

import java.util.ArrayList;

import java.util.List;

import org.hibernate.envers.query.criteria.AuditCriterion;

import org.springframework.transaction.annotation.Transactional;

import eu.etaxonomy.cdm.api.service.pager.Pager;

import eu.etaxonomy.cdm.api.service.pager.impl.DefaultPagerImpl;

import eu.etaxonomy.cdm.model.common.VersionableEntity;

import eu.etaxonomy.cdm.model.view.AuditEvent;

import eu.etaxonomy.cdm.model.view.AuditEventRecord;

import eu.etaxonomy.cdm.persistence.dao.common.AuditEventSort;

import eu.etaxonomy.cdm.persistence.dao.common.IVersionableDao;

public abstract class VersionableServiceBase<T extends VersionableEntity, DAO extends IVersionableDao<T>> extends ServiceBase<T,DAO> implements IVersionableService<T> {

	@Transactional(readOnly = true)

	public Pager<AuditEventRecord<T>> pageAuditEvents(T t, Integer pageSize,	Integer pageNumber, AuditEventSort sort, List<String> propertyPaths) {

		Integer numberOfResults = dao.countAuditEvents(t, sort);

		List<AuditEventRecord<T>> results = new ArrayList<AuditEventRecord<T>>();

		if(numberOfResults > 0) { // no point checking again //TODO use AbstractPagerImpl.hasResultsInRange(numberOfResults, pageNumber, pageSize)

			results = dao.getAuditEvents(t, pageSize, pageNumber, sort,propertyPaths);

		}

		return new DefaultPagerImpl<AuditEventRecord<T>>(pageNumber, numberOfResults, pageSize, results);

	}

	@Transactional(readOnly = true)

	public AuditEventRecord<T> getNextAuditEvent(T t) {

		return dao.getNextAuditEvent(t);

	}

	@Transactional(readOnly = true)

	public AuditEventRecord<T> getPreviousAuditEvent(T t) {

		return dao.getPreviousAuditEvent(t);

	}

	@Transactional(readOnly = true)

	public Pager<AuditEventRecord<T>> pageAuditEvents(Class<? extends T> clazz,AuditEvent from,AuditEvent to, List<AuditCriterion> criteria, Integer pageSize, Integer pageNumber, AuditEventSort sort,List<String> propertyPaths) {

		Integer numberOfResults = dao.countAuditEvents(clazz, from, to, criteria);

		List<AuditEventRecord<T>> results = new ArrayList<AuditEventRecord<T>>();

		if(numberOfResults > 0) { // no point checking again //TODO use AbstractPagerImpl.hasResultsInRange(numberOfResults, pageNumber, pageSize)

			results = dao.getAuditEvents(clazz,from,to,criteria, pageSize, pageNumber, sort,propertyPaths);

		}

		return new DefaultPagerImpl<AuditEventRecord<T>>(pageNumber, numberOfResults, pageSize, results);

	}

}