EDIT

package eu.etaxonomy.cdm.api.service;

import java.util.ArrayList;

import java.util.List;

import org.apache.log4j.Logger;

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

import org.springframework.stereotype.Service;

import org.springframework.transaction.annotation.Transactional;

import eu.etaxonomy.cdm.api.service.statistics.Statistics;

import eu.etaxonomy.cdm.api.service.statistics.StatisticsConfigurator;

import eu.etaxonomy.cdm.api.service.statistics.StatisticsTypeEnum;

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

import eu.etaxonomy.cdm.model.description.DescriptionBase;

import eu.etaxonomy.cdm.model.name.TaxonName;

import eu.etaxonomy.cdm.model.taxon.Classification;

import eu.etaxonomy.cdm.model.taxon.Synonym;

import eu.etaxonomy.cdm.model.taxon.Taxon;

import eu.etaxonomy.cdm.model.taxon.TaxonBase;

import eu.etaxonomy.cdm.persistence.dao.description.IDescriptionDao;

import eu.etaxonomy.cdm.persistence.dao.name.ITaxonNameDao;

import eu.etaxonomy.cdm.persistence.dao.reference.IReferenceDao;

import eu.etaxonomy.cdm.persistence.dao.statistics.IStatisticsDao;

import eu.etaxonomy.cdm.persistence.dao.taxon.IClassificationDao;

import eu.etaxonomy.cdm.persistence.dao.taxon.ITaxonDao;

/**

 *

 * @author s.buers Service to provide statistic data of the database elements

 */

@Service

@Transactional

public class StatisticsServiceImpl implements IStatisticsService {

	private static final Logger logger = Logger

			.getLogger(StatisticsServiceImpl.class);

	// this does not make sense, we just count nothing if no type is given.

	// the one who calls this service should check that there are types given!

//	private static final StatisticsTypeEnum DEFAULT_TYPE=StatisticsTypeEnum.ALL_TAXA;

	//TODO create a list with all types.

	// this constant can also be used by the ones that use the service

	private static final IdentifiableEntity<?> ALL_DB = null;

	@Override

	@Transactional

	public IdentifiableEntity<?> getFilterALL_DB(){

		return ALL_DB;

	}

	private ArrayList<Statistics> statisticsList;

	@Autowired

	private ITaxonDao taxonDao;

	@Autowired

	private ITaxonNameDao taxonNameDao;

	@Autowired

	private IClassificationDao classificationDao;

	@Autowired

	private IReferenceDao referenceDao;

	@Autowired

	private IStatisticsDao statisticsDao;

	@Autowired

	private IDescriptionDao descriptionDao;

	/**

	 * counts all the elements referenced in the configurator from the part of

	 * the database referenced in the configurator

	 *

	 * @param configurators

	 * @return be aware that a Statistics.countMap might contain "null"

	 *         {@link Number} values, if the count failed (, if the value is "0"

	 *         the count succeeded in counting zero elements.)

	 */

	@Override

	@Transactional

	public List<Statistics> getCountStatistics(

			List<StatisticsConfigurator> configurators) {

		statisticsList = new ArrayList<>();

		for (StatisticsConfigurator statisticsConfigurator : configurators) {

			// create a Statistics element for each configurator

			countStatisticsPart(statisticsConfigurator);

		}

		return this.statisticsList;

	}

	@Transactional

	private void countStatisticsPart(StatisticsConfigurator configurator) {

		// get last element of configurator.filter (the node that is the root

		// for the count):

		IdentifiableEntity<?> filter = configurator.getFilter().get(

				(configurator.getFilter().size()) - 1);

		if (filter == getFilterALL_DB()) {

			countAll(configurator);

		} else { // check for classtype classification

			countPart(configurator, filter);

		}

	}

	private void countAll(StatisticsConfigurator configurator) {

		Statistics statistics = new Statistics(configurator);

		for (StatisticsTypeEnum type : configurator.getType()) {

			Long counter = null;

			switch (type) {

			case ALL_TAXA:

				counter = taxonDao.count(TaxonBase.class);

				break;

			case SYNONYMS:

				counter = taxonDao.count(Synonym.class);

				break;

			case ACCEPTED_TAXA:

				counter = taxonDao.count(Taxon.class);

				break;

			case ALL_REFERENCES:

				counter = referenceDao.count(eu.etaxonomy.cdm.model.reference.Reference.class);

				counter -=statisticsDao.countNomenclaturalReferences();

				break;

			case NOMENCLATURAL_REFERENCES:

				counter = statisticsDao.countNomenclaturalReferences();

				break;

			case CLASSIFICATION:

				counter = classificationDao.count(Classification.class);

				break;

			case TAXON_NAMES:

				counter = taxonNameDao.count(TaxonName.class);

				break;

			case DESCRIPTIVE_SOURCE_REFERENCES:

				counter = statisticsDao.countDescriptiveSourceReferences();

				break;

			case DESCRIPTIONS:

				counter = descriptionDao.count(DescriptionBase.class);

				break;

			}

			statistics.addCount(type, counter);

		}

		statisticsList.add(statistics);

	}

	@Transactional

	private void countPart(StatisticsConfigurator configurator,

			IdentifiableEntity filter) {

		// TODO maybe remove redundant parameter filter

		Statistics statistics = new Statistics(configurator);

		Long counter = null;

		if (filter instanceof Classification) {

			for (StatisticsTypeEnum type : configurator.getType()) {

				switch (type) {

				case CLASSIFICATION:

					logger.info("there should not be any classification "

							+ "nested in an other classification");

					// so we set counter to 1, as a classification itself is one classification

					counter = new Long(1);

					break;

				case ACCEPTED_TAXA:

					counter = statisticsDao.countTaxaInClassification(

							Taxon.class, (Classification) filter);

					break;

				case ALL_TAXA:

					counter = statisticsDao.countTaxaInClassification(

							TaxonBase.class, (Classification) filter);

					break;

				case SYNONYMS:

					counter = statisticsDao.countTaxaInClassification(

							Synonym.class, (Classification) filter);

					break;

				case TAXON_NAMES:

					counter = statisticsDao

							.countTaxonNames((Classification) filter);

					break;

				case ALL_REFERENCES:

//					counter = statisticsDao.countReferencesInClassification((Classification) filter);

					counter = statisticsDao.countReferencesInClassificationWithUuids((Classification) filter);

					counter+=statisticsDao

							.countDescriptive(true, (Classification) filter);

					break;

				case DESCRIPTIVE_SOURCE_REFERENCES:

					counter = statisticsDao

							.countDescriptive(true, (Classification) filter);

					break;

				case DESCRIPTIONS:

					counter = statisticsDao

							.countDescriptive(false, (Classification) filter);

					break;

				case NOMENCLATURAL_REFERENCES:

					counter = statisticsDao

							.countNomenclaturalReferences((Classification) filter);

					break;

				}

				statistics.addCount(type, counter);

			}

		} else if(filter instanceof Taxon) {

			//TODO get all taxa of the tree:

			do{

				filter.getUuid();

				statisticsDao.getTaxonTree(filter);

			}while(true);

		}else {

			// we just return null as count for the statistics

			// element, if the filter is neither classification nor null.

		}

		statisticsList.add(statistics);

	}

}