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ObServe Toolkit Common Persistence module
There is a newer version: 4.34
package fr.ird.observe.binder;

/*-
 * #%L
 * ObServe Toolkit :: Common Persistence
 * %%
 * Copyright (C) 2008 - 2017 IRD, Ultreia.io
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import com.google.common.collect.Iterables;
import fr.ird.observe.binder.data.DataEntityReferenceBinderSupport;
import fr.ird.observe.binder.referential.ReferentialEntityReferenceBinderSupport;
import fr.ird.observe.dto.IdDto;
import fr.ird.observe.dto.data.DataDto;
import fr.ird.observe.dto.reference.DataDtoReference;
import fr.ird.observe.dto.reference.ReferentialDtoReference;
import fr.ird.observe.dto.referential.ReferentialDto;
import fr.ird.observe.dto.referential.ReferentialLocale;
import fr.ird.observe.entities.ObserveDataEntity;
import fr.ird.observe.entities.ObserveEntity;
import fr.ird.observe.entities.referentiel.ObserveReferentialEntity;
import fr.ird.observe.spi.persistence.DataEntityDefinition;
import fr.ird.observe.spi.persistence.PersistenceModuleHelper;
import fr.ird.observe.spi.persistence.ReferentialEntityDefinition;
import org.apache.commons.collections4.CollectionUtils;
import org.nuiton.topia.persistence.TopiaDao;

import javax.annotation.Nullable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Objects;

/**
 * Created on 24/11/15.
 *
 * @author Tony Chemit - [email protected]
 */
public abstract class EntityDtoBinderSupport extends EntityBinderSupport {

    protected EntityDtoBinderSupport(Class dtoType, Class entityType) {
        super(dtoType, entityType);
    }

    public abstract void copyToEntity(ReferentialLocale referentialLocale, D dto, E entity);

    public abstract void copyToDto(ReferentialLocale referentialLocale, E entity, D dto);

    // -------------------------------------------------------------------------------------------------------------- //
    // -- REFERENTIAL → ENTITY -------------------------------------------------------------------------------------- //
    // -------------------------------------------------------------------------------------------------------------- //

    protected final , EE extends ObserveReferentialEntity> LinkedHashSet toEntitySet(@Nullable Collection references) {
        if (CollectionUtils.isEmpty(references)) {
            return null;
        }

        LinkedHashSet entityList = new LinkedHashSet<>(references.size());
        RR firstReference = Iterables.get(references, 0, null);
        Objects.requireNonNull(firstReference);
        ReferentialEntityDefinition> entityContext = PersistenceModuleHelper.fromReferentialReference(firstReference);
        ReferentialEntityReferenceBinderSupport binder = entityContext.toEntityReferenceBinder();

        for (RR reference : references) {
            EE entity = binder.newEntity(reference);
            entityList.add(entity);
        }
        return entityList;
    }

    // -------------------------------------------------------------------------------------------------------------- //
    // -- ENTITY → REFERENTIAL REFERENCE ---------------------------------------------------------------------------- //
    // -------------------------------------------------------------------------------------------------------------- //

    protected final > List toReferentialReferenceList(ReferentialLocale referentialLocale, @Nullable Collection entities) {
        if (CollectionUtils.isEmpty(entities)) {
            return null;
        }
        List references = new ArrayList<>(entities.size());

        EE first = entities.iterator().next();
        ReferentialEntityDefinition entityContext = PersistenceModuleHelper.fromReferentialEntity(first);
        ReferentialEntityReferenceBinderSupport binder = entityContext.toEntityReferenceBinder();

        for (EE entity : entities) {
            RR reference = binder.toReference(referentialLocale, entity);
            references.add(reference);
        }
        return references;
    }

    // -------------------------------------------------------------------------------------------------------------- //
    // -- CREATE ENTITY OR DTO -------------------------------------------------------------------------------------- //
    // -------------------------------------------------------------------------------------------------------------- //

    public final D toDto(ReferentialLocale referentialLocale, E entity) {
        D dto = newDto();
        copyToDto(referentialLocale, entity, dto);
        return dto;
    }

    protected final 
, EE extends ObserveReferentialEntity> EE toEntity(@Nullable RR reference) {
        if (reference == null) {
            return null;
        }
        ReferentialEntityDefinition> entityContext = PersistenceModuleHelper.fromReferentialReference(reference);
        ReferentialEntityReferenceBinderSupport binder = entityContext.toEntityReferenceBinder();
        return binder.newEntity(reference);
    }

    protected final , EE extends ObserveDataEntity> EE toDataEntity(@Nullable RR reference) {
        if (reference == null) {
            return null;
        }
        DataEntityDefinition> entityContext = PersistenceModuleHelper.fromDataReference(reference);
        DataEntityReferenceBinderSupport binder = entityContext.toEntityReferenceBinder();
        return binder.newEntity(reference);
    }

    protected final > RR toReferentialReference(ReferentialLocale referentialLocale, @Nullable EE entity) {
        if (entity == null) {
            return null;
        }
        ReferentialEntityDefinition entityContext = PersistenceModuleHelper.fromReferentialEntity(entity);
        ReferentialEntityReferenceBinderSupport binder = entityContext.toEntityReferenceBinder();
        return binder.toReference(referentialLocale, entity);

    }

    protected final > RR toDataReference(ReferentialLocale referentialLocale, @Nullable EE entity) {
        if (entity == null) {
            return null;
        }
        DataEntityDefinition entityContext = PersistenceModuleHelper.fromDataEntity(entity);
        DataEntityReferenceBinderSupport binder = entityContext.toEntityReferenceBinder();
        return binder.toReference(referentialLocale, entity);

    }

}