EDIT

/**

 * 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.Iterator;

import java.util.List;

import java.util.Set;

import java.util.UUID;

import org.hibernate.ObjectDeletedException;

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

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.transaction.annotation.Transactional;

import eu.etaxonomy.cdm.api.service.config.DeleteConfiguratorBase;

import eu.etaxonomy.cdm.api.service.exception.ReferencedObjectUndeletableException;

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

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

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

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> {

	@Autowired

    protected ICommonService commonService;

	@Override

    @Transactional(readOnly = true)

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

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

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

		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<>(pageNumber, numberOfResults, pageSize, results);

	}

	@Override

    @Transactional(readOnly = true)

	public AuditEventRecord<T> getNextAuditEvent(T t) {

		return dao.getNextAuditEvent(t);

	}

	@Override

    @Transactional(readOnly = true)

	public AuditEventRecord<T> getPreviousAuditEvent(T t) {

		return dao.getPreviousAuditEvent(t);

	}

	@Override

    @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) {

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

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

		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<>(pageNumber, numberOfResults, pageSize, results);

	}

	 /**

     * the basic isDeletable method return false if the object is referenced from any other object.

     */

    @Override

    public DeleteResult isDeletable(UUID baseUUID, DeleteConfiguratorBase config){

    	DeleteResult result = new DeleteResult();

    	T base = this.find(baseUUID);

    	if (base == null){

    	    result.setAbort();

    	    result.addException(new ObjectDeletedException("The object was already deleted.", baseUUID, null));

    	}

    	Set<CdmBase> references = commonService.getReferencingObjectsForDeletion(base);

    	if (references != null){

	    	result.addRelatedObjects(references);

	    	Iterator<CdmBase> iterator = references.iterator();

	    	CdmBase ref;

	    	while (iterator.hasNext()){

	    		ref = iterator.next();

	    		String message = "An object of " + ref.getClass().getName() + " with ID " + ref.getId() + " is referencing the object" ;

	    		result.addException(new ReferencedObjectUndeletableException(message));

	    		result.setAbort();

	    	}

    	}

    	return result;

    }

}